Assembly Diffs

linux arm

Diffs are based on 70,838 contexts (28,524 MinOpts, 42,314 FullOpts).

MISSED contexts: base: 4,075 (3.76%), diff: 33,979 (31.35%)

Overall (-53,266 bytes)

Collection Base size (bytes) Diff size (bytes)
benchmarks.run.linux.arm.checked.mch 416,870 -2,428
benchmarks.run_pgo.linux.arm.checked.mch 1,814,364 -15,576
benchmarks.run_tiered.linux.arm.checked.mch 1,798,372 -10,400
coreclr_tests.run.linux.arm.checked.mch 84,084 -32
libraries.pmi.linux.arm.checked.mch 926,186 -6,330
libraries_tests.run.linux.arm.Release.mch 836,994 -9,804
librariestestsnotieredcompilation.run.linux.arm.Release.mch 418,846 -3,996
realworld.run.linux.arm.checked.mch 1,992,442 -4,700

MinOpts (-21,732 bytes)

Collection Base size (bytes) Diff size (bytes)
benchmarks.run_pgo.linux.arm.checked.mch 1,103,720 -6,886
benchmarks.run_tiered.linux.arm.checked.mch 1,328,278 -7,284
libraries_tests.run.linux.arm.Release.mch 691,708 -7,562

FullOpts (-31,534 bytes)

Collection Base size (bytes) Diff size (bytes)
benchmarks.run.linux.arm.checked.mch 403,432 -2,428
benchmarks.run_pgo.linux.arm.checked.mch 710,644 -8,690
benchmarks.run_tiered.linux.arm.checked.mch 470,094 -3,116
coreclr_tests.run.linux.arm.checked.mch 84,084 -32
libraries.pmi.linux.arm.checked.mch 926,186 -6,330
libraries_tests.run.linux.arm.Release.mch 145,286 -2,242
librariestestsnotieredcompilation.run.linux.arm.Release.mch 418,846 -3,996
realworld.run.linux.arm.checked.mch 1,987,926 -4,700

Example diffs

benchmarks.run.linux.arm.checked.mch

-30 (-33.33%) : 253.dasm - System.Linq.Enumerable:IsEmptyArraySystem.__Canon:ubyte (FullOpts) 

@@ -2,82 +2,66 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V02 loc0         [V02,T05] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V02 loc0         [V02,T03] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38282_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
+                      ;; size=6 bbWeight=1 PerfScore 3.00
 G_M38282_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M38282_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38282_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M38282_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M38282_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M38282_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-            blx     r3       // CORINFO_HELP_ISINSTANCEOFARRAY
+            blx     r3       // CORINFO_HELP_ISINSTANCEOFINTERFACE
             ; gcrRegs -[r1 r4] +[r0]
+            ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M38282_IG09
-                       ;; size=18 bbWeight=1 PerfScore 7.00
-G_M38282_IG06:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
+            beq     SHORT G_M38282_IG06
+                       ;; size=36 bbWeight=1 PerfScore 12.00
+G_M38282_IG03:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
             ldr     r0, [r0+0x04]
             ; gcrRegs -[r0]
             cmp     r0, 0
-            beq     SHORT G_M38282_IG07
+            beq     SHORT G_M38282_IG04
             movs    r0, 0
-            b       SHORT G_M38282_IG08
+            b       SHORT G_M38282_IG05
                      ;; size=10 bbWeight=0.50 PerfScore 2.50
-G_M38282_IG07:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M38282_IG04:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 1
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG08:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
-G_M38282_IG09:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M38282_IG05:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
+G_M38282_IG06:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 0
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG10:        ; bbWeight=0.50, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
+G_M38282_IG07:        ; bbWeight=0.50, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
 
-; Total bytes of code 90, prolog size 14, PerfScore 24.10, instruction count 34, allocated bytes for code 90 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
+; Total bytes of code 60, prolog size 4, PerfScore 19.50, instruction count 24, allocated bytes for code 60 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -89,7 +73,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 45 (0x0002d) Actual length = 90 (0x00005a)
+  Function Length   : 30 (0x0001e) Actual length = 60 (0x00003c)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -101,7 +85,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-20 (-30.30%) : 3661.dasm - System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start[System.Text.Json.Serialization.Tests.ReadJson`1+d5[System.Canon]](byref):this (FullOpts) 

@@ -2,79 +2,71 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; fully interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )   byref  ->  zero-ref    this single-def
-;  V01 TypeCtx      [V01,T00] (  5,  4.20)     int  ->   r1         single-def
-;  V02 arg1         [V02,T02] (  3,  3   )   byref  ->   r4         single-def
+;  V01 TypeCtx      [V01,T00] (  4,  4   )     int  ->   r1         single-def
+;  V02 arg1         [V02,T01] (  3,  3   )   byref  ->   r4         single-def
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r0         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M63615_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r1, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r1, [sp+0x04]
             mov     r4, r2
             ; byrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M63615_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref, isz
-            ldr     r0, [r1+0x20]
-            ldr     r0, [r0+0x08]
-            cmp     r0, 0
-            beq     SHORT G_M63615_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M63615_IG03:        ; bbWeight=0.80, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref, isz
-            b       SHORT G_M63615_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M63615_IG04:        ; bbWeight=0.20, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M63615_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
             mov     r0, r1
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-                     ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M63615_IG05:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
             mov     r1, r4
             ; byrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-                     ;; size=12 bbWeight=1 PerfScore 4.00
-G_M63615_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,lr}
+                      ;; size=32 bbWeight=1 PerfScore 10.00
+G_M63615_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 8
+            pop     {r4,lr}
             bx      r3      // <unknown method>
             ; gcr arg pop 0
                        ;; size=8 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 66, prolog size 16, PerfScore 18.00, instruction count 23, allocated bytes for code 66 (MethodHash=258c0780) for method System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start[System.Text.Json.Serialization.Tests.ReadJson`1+<Setup>d__5[System.__Canon]](byref):this (FullOpts)
+; Total bytes of code 46, prolog size 6, PerfScore 16.00, instruction count 16, allocated bytes for code 46 (MethodHash=258c0780) for method System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start[System.Text.Json.Serialization.Tests.ReadJson`1+<Setup>d__5[System.__Canon]](byref):this (FullOpts)
 ; ============================================================
 
 Unwind Info:
   >> Start offset   : 0x000000 (not in unwind data)
   >>   End offset   : 0xd1ffab1e (not in unwind data)
-  Code Words        : 1
-  Epilog Count      : 0
+  Code Words        : 2
+  Epilog Count      : 1
   F bit             : 0
-  E bit             : 1
+  E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 33 (0x00021) Actual length = 66 (0x000042)
-  --- One epilog, unwind codes at 0
+  Function Length   : 23 (0x00017) Actual length = 46 (0x00002e)
+  ---- Epilog scopes ----
+  ---- Scope 0
+  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
+  Condition                  : 14 (0xe) (always)
+  Epilog Start Index         : 3 (0x03)
   ---- Unwind codes ----
-    ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
+    ---- Epilog start at index 3 ----
+    02          add sp, sp, #8                      ; opsize 16
+    A0 10       pop {r4,lr}                         ; opsize 32
+    FF          end
     FF          end

-22 (-28.95%) : 4552.dasm - Utf8Json.JsonSerializer:DeserializeSystem.__Canon:System.__Canon (FullOpts) 

@@ -2,48 +2,32 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; fully interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.IO.Stream>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.IO.Stream>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V03 tmp1         [V03    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V04 tmp2         [V04,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V05 rat0         [V05,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V06 rat1         [V06,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V04 tmp2         [V04,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M3168_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M3168_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M3168_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M3168_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M3168_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M3168_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                      ;; size=6 bbWeight=1 PerfScore 3.00
+G_M3168_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-                     ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M3168_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r2, 0xd1ff
             movt    r2, 0xd1ff
             ldr     r2, [r2]
@@ -53,31 +37,38 @@ G_M3168_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-                     ;; size=22 bbWeight=1 PerfScore 7.00
-G_M3168_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,lr}
+                      ;; size=40 bbWeight=1 PerfScore 12.00
+G_M3168_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 8
+            pop     {r4,lr}
             bx      r3      // <unknown method>
             ; gcr arg pop 0
                        ;; size=8 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 76, prolog size 16, PerfScore 21.60, instruction count 26, allocated bytes for code 76 (MethodHash=e992f39f) for method Utf8Json.JsonSerializer:Deserialize[System.__Canon](System.IO.Stream):System.__Canon (FullOpts)
+; Total bytes of code 54, prolog size 6, PerfScore 18.00, instruction count 18, allocated bytes for code 54 (MethodHash=e992f39f) for method Utf8Json.JsonSerializer:Deserialize[System.__Canon](System.IO.Stream):System.__Canon (FullOpts)
 ; ============================================================
 
 Unwind Info:
   >> Start offset   : 0x000000 (not in unwind data)
   >>   End offset   : 0xd1ffab1e (not in unwind data)
-  Code Words        : 1
-  Epilog Count      : 0
+  Code Words        : 2
+  Epilog Count      : 1
   F bit             : 0
-  E bit             : 1
+  E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 38 (0x00026) Actual length = 76 (0x00004c)
-  --- One epilog, unwind codes at 0
+  Function Length   : 27 (0x0001b) Actual length = 54 (0x000036)
+  ---- Epilog scopes ----
+  ---- Scope 0
+  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
+  Condition                  : 14 (0xe) (always)
+  Epilog Start Index         : 3 (0x03)
   ---- Unwind codes ----
-    ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
+    ---- Epilog start at index 3 ----
+    02          add sp, sp, #8                      ; opsize 16
+    A0 10       pop {r4,lr}                         ; opsize 32
+    FF          end
     FF          end

+8 (+3.92%) : 3988.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpanSystem.__Canon:System.Span`1System.__Canon 

@@ -8,27 +8,26 @@
 ; 0 inlinees with PGO data; 4 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 RetBuf       [V00,T01] (  4,  4   )   byref  ->   r5         single-def
-;  V01 TypeCtx      [V01,T02] (  5,  3.60)     int  ->   r6         single-def
+;  V00 RetBuf       [V00,T02] (  4,  4   )   byref  ->   r6         single-def
+;  V01 TypeCtx      [V01,T01] (  5,  4   )     int  ->   r5         single-def
 ;  V02 arg0         [V02,T00] (  6,  4.50)     ref  ->   r4         class-hnd single-def <System.Collections.Generic.List`1[System.__Canon]>
 ;* V03 loc0         [V03    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.Span`1[System.__Canon]>
-;  V04 loc1         [V04,T07] (  4,  2   )     int  ->   r8        
-;  V05 loc2         [V05,T06] (  4,  2   )     ref  ->   r7         class-hnd single-def <<unknown class>>
+;  V04 loc1         [V04,T06] (  4,  2   )     int  ->   r8        
+;  V05 loc2         [V05,T05] (  4,  2   )     ref  ->   r7         class-hnd single-def <<unknown class>>
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V07 loc4         [V07,T08] (  3,  2   )     int  ->   r3         "spilling helperCall"
+;  V07 loc4         [V07,T08] (  2,  2   )     int  ->   r0         "spilling helperCall"
 ;* V08 tmp2         [V08    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[System.__Canon]>
 ;* V09 tmp3         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V10 tmp4         [V10    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V11 tmp5         [V11    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V12 tmp6         [V12    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;  V13 tmp7         [V13,T09] (  2,  2   )   byref  ->   r7         single-def "Inlining Arg"
+;  V13 tmp7         [V13,T07] (  2,  2   )   byref  ->   r7         single-def "Inlining Arg"
 ;* V14 tmp8         [V14    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V15 tmp9         [V15    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;  V16 tmp10        [V16,T04] (  3,  2.50)   byref  ->   r7         "field V03._reference (fldOffset=0x0)" P-INDEP
-;  V17 tmp11        [V17,T05] (  3,  2.50)     int  ->   r8         "field V03._length (fldOffset=0x4)" P-INDEP
-;  V18 tmp12        [V18,T10] (  2,  1   )   byref  ->   r7         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;  V19 tmp13        [V19,T11] (  2,  1   )     int  ->   r8         "field V08._length (fldOffset=0x4)" P-INDEP
-;  V20 rat0         [V20,T03] (  3,  2.80)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V16 tmp10        [V16,T03] (  3,  2.50)   byref  ->   r7         "field V03._reference (fldOffset=0x0)" P-INDEP
+;  V17 tmp11        [V17,T04] (  3,  2.50)     int  ->   r8         "field V03._length (fldOffset=0x4)" P-INDEP
+;  V18 tmp12        [V18,T09] (  2,  1   )   byref  ->   r7         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
+;  V19 tmp13        [V19,T10] (  2,  1   )     int  ->   r8         "field V08._length (fldOffset=0x4)" P-INDEP
 ;
 ; Lcl frame size = 12
 
@@ -37,19 +36,19 @@ G_M30960_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             sub     sp, 12
             add     r11, sp, 32
             str     r1, [r11-0x1C]
-            mov     r5, r0
-            ; byrRegs +[r5]
-            mov     r6, r1
+            mov     r6, r0
+            ; byrRegs +[r6]
+            mov     r5, r1
             mov     r4, r2
             ; gcrRegs +[r4]
                        ;; size=20 bbWeight=1 PerfScore 7.00
-G_M30960_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0020 {r5}, byref, isz
+G_M30960_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0040 {r6}, byref, isz
             movs    r7, 0
             mov     r8, 0
             cmp     r4, 0
-            beq     SHORT G_M30960_IG09
+            beq     SHORT G_M30960_IG06
                         ;; size=10 bbWeight=1 PerfScore 4.00
-G_M30960_IG03:        ; bbWeight=0.50, gcrefRegs=0010 {r4}, byrefRegs=0020 {r5}, byref, isz
+G_M30960_IG03:        ; bbWeight=0.50, gcrefRegs=0010 {r4}, byrefRegs=0040 {r6}, byref, isz
             ldr     r8, [r4+0x08]
             ldr     r7, [r4+0x04]
             ; gcrRegs +[r7]
@@ -64,34 +63,22 @@ G_M30960_IG03:        ; bbWeight=0.50, gcrefRegs=0010 {r4}, byrefRegs=0020 {r5},
             ldr     r3, [r3]
             blx     r3     // <unknown method>
                        ;; size=38 bbWeight=0.50 PerfScore 6.00
-G_M30960_IG04:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref, isz
+G_M30960_IG04:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0040 {r6}, byref, isz
             ldr     r0, [r7+0x04]
             cmp     r0, r8
-            blo     SHORT G_M30960_IG11
-            ldr     r0, [r6+0x20]
-            ldr     r3, [r0+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M30960_IG06
-                       ;; size=14 bbWeight=0.50 PerfScore 3.50
-G_M30960_IG05:        ; bbWeight=0.40, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref, isz
-            b       SHORT G_M30960_IG07
-                       ;; size=2 bbWeight=0.40 PerfScore 0.40
-G_M30960_IG06:        ; bbWeight=0.10, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref
-            mov     r0, r6
+            blo     SHORT G_M30960_IG08
+            mov     r0, r5
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r3, r0
-                       ;; size=22 bbWeight=0.10 PerfScore 0.70
-G_M30960_IG07:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref, isz
-            ldr     r0, [r4+0x04]
-            ; gcrRegs +[r0]
-            ldr     r0, [r0]
-            ; gcrRegs -[r0]
-            cmp     r0, r3
-            beq     SHORT G_M30960_IG08
+            blx     r3        // CORINFO_HELP_MEMCPY
+            ldr     r1, [r4+0x04]
+            ; gcrRegs +[r1]
+            ldr     r1, [r1]
+            ; gcrRegs -[r1]
+            cmp     r1, r0
+            beq     SHORT G_M30960_IG05
             movw    r0, 0xd1ff
             movt    r0, 0xd1ff
             movw    r1, 0xd1ff
@@ -101,13 +88,19 @@ G_M30960_IG07:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r4]
-                      ;; size=36 bbWeight=0.50 PerfScore 6.00
-G_M30960_IG08:        ; bbWeight=0.50, gcrefRegs=0080 {r7}, byrefRegs=0020 {r5}, byref, isz
+                      ;; size=62 bbWeight=0.50 PerfScore 10.50
+G_M30960_IG05:        ; bbWeight=0.50, gcrefRegs=0080 {r7}, byrefRegs=0040 {r6}, byref, isz
+            mov     r0, r5
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             adds    r7, 8
             ; gcrRegs -[r7]
             ; byrRegs +[r7]
             cmp     r8, 0
-            bge     SHORT G_M30960_IG09
+            bge     SHORT G_M30960_IG06
             movw    r0, 0xd1ff
             movt    r0, 0xd1ff
             movw    r1, 0xd1ff
@@ -116,17 +109,17 @@ G_M30960_IG08:        ; bbWeight=0.50, gcrefRegs=0080 {r7}, byrefRegs=0020 {r5},
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // <unknown method>
-                     ;; size=36 bbWeight=0.50 PerfScore 5.50
-G_M30960_IG09:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=00A0 {r5 r7}, byref
-            str     r7, [r5]
-            str     r8, [r5+0x04]
+                        ;; size=56 bbWeight=0.50 PerfScore 8.50
+G_M30960_IG06:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=00C0 {r6 r7}, byref
+            str     r7, [r6]
+            str     r8, [r6+0x04]
                       ;; size=6 bbWeight=1 PerfScore 2.00
-G_M30960_IG10:        ; bbWeight=1, epilog, nogc, extend
+G_M30960_IG07:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 12
             pop     {r4,r5,r6,r7,r8,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
-G_M30960_IG11:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
-            ; byrRegs -[r5 r7]
+G_M30960_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+            ; byrRegs -[r6-r7]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -134,7 +127,7 @@ G_M30960_IG11:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 204, prolog size 14, PerfScore 37.10, instruction count 70, allocated bytes for code 204 (MethodHash=041e870f) for method System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (FullOpts)
+; Total bytes of code 212, prolog size 14, PerfScore 40.00, instruction count 70, allocated bytes for code 212 (MethodHash=041e870f) for method System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -146,7 +139,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 102 (0x00066) Actual length = 204 (0x0000cc)
+  Function Length   : 106 (0x0006a) Actual length = 212 (0x0000d4)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

+8 (+5.00%) : 1907.dasm - System.Array:IndexOfSystem.__Canon:int (FullOpts) 

@@ -8,11 +8,11 @@
 ; 0 inlinees with PGO data; 2 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T02] (  5,  4.36)     int  ->   r0         single-def
+;  V00 TypeCtx      [V00,T01] (  5,  5   )     int  ->   r5         single-def
 ;  V01 arg0         [V01,T00] (  5,  5   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
-;  V02 arg1         [V02,T05] (  3,  3   )     ref  ->   r6         ld-addr-op class-hnd single-def <System.__Canon>
-;  V03 arg2         [V03,T01] (  5,  5   )     int  ->   r5         single-def
-;  V04 arg3         [V04,T09] (  2,  2   )     int  ->   r7         single-def
+;  V02 arg1         [V02,T04] (  3,  3   )     ref  ->   r7         ld-addr-op class-hnd single-def <System.__Canon>
+;  V03 arg2         [V03,T02] (  5,  5   )     int  ->   r6         single-def
+;  V04 arg3         [V04,T06] (  2,  2   )     int  ->   r8         single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -24,79 +24,66 @@
 ;* V13 tmp4         [V13    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V14 tmp5         [V14    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;  V15 tmp6         [V15,T03] (  3,  6   )     ref  ->   r0         single-def "argument with side effect"
-;  V16 cse0         [V16,T08] (  3,  3   )     int  ->   r1         "CSE - aggressive"
-;  V17 rat0         [V17,T07] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V18 rat1         [V18,T04] (  3,  5.60)     int  ->   r1         "spilling expr"
-;  V19 rat2         [V19,T06] (  3,  4.48)     int  ->   r1         "fgMakeTemp is creating a new local variable"
+;  V16 cse0         [V16,T05] (  3,  3   )     int  ->   r0         "CSE - aggressive"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 20
 
 G_M13831_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r11,lr}
-            sub     sp, 16
-            add     r11, sp, 32
-            str     r0, [r11-0x14]
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 20
+            add     r11, sp, 40
+            str     r0, [r11-0x1C]
+            mov     r5, r0
             mov     r4, r1
             ; gcrRegs +[r4]
-            mov     r6, r2
-            ; gcrRegs +[r6]
-            mov     r5, r3
-            ldr     r7, [sp+0x28]
-                       ;; size=22 bbWeight=1 PerfScore 8.00
-G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
+            mov     r7, r2
+            ; gcrRegs +[r7]
+            mov     r6, r3
+            ldr     r8, [sp+0x30]
+                       ;; size=26 bbWeight=1 PerfScore 9.00
+G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0090 {r4 r7}, byrefRegs=0000 {}, byref, isz
             cmp     r4, 0
-            beq     SHORT G_M13831_IG08
-            ldr     r1, [r4+0x04]
-            cmp     r1, r5
-            blo     SHORT G_M13831_IG09
-            subs    r1, r1, r5
-            cmp     r1, r7
-            blo     SHORT G_M13831_IG10
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x04]
-            cmp     r3, 12
-            ble     SHORT G_M13831_IG05
-                       ;; size=24 bbWeight=1 PerfScore 12.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r1+0x0C]
-            cmp     r1, 0
-            beq     SHORT G_M13831_IG05
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
+            beq     SHORT G_M13831_IG04
+            ldr     r0, [r4+0x04]
+            cmp     r0, r6
+            blo     SHORT G_M13831_IG05
+            subs    r0, r0, r6
+            cmp     r0, r8
+            blo     SHORT G_M13831_IG06
+            mov     r0, r5
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.36 PerfScore 2.16
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r0, r5
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.EqualityComparer`1[System.__Canon]:get_Default():System.Collections.Generic.EqualityComparer`1[System.__Canon]
             ; gcrRegs +[r0]
-            str     r7, [sp]
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
-            mov     r3, r5
+            mov     r3, r6
             ldr     lr, [r0]
             ldr     lr, [lr+0x30]
             ldr     lr, [lr]
             blx     lr     // <unknown method>
-            ; gcrRegs -[r0-r2 r4 r6]
-                       ;; size=36 bbWeight=1 PerfScore 13.00
-G_M13831_IG07:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 16
-            pop     {r4,r5,r6,r7,r11,pc}
+            ; gcrRegs -[r0-r2 r4 r7]
+                       ;; size=92 bbWeight=1 PerfScore 32.00
+G_M13831_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 20
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 2
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -104,14 +91,14 @@ G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             blx     r3     // System.ThrowHelper:ThrowArgumentNullException(int)
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -119,7 +106,7 @@ G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 160, prolog size 14, PerfScore 40.20, instruction count 61, allocated bytes for code 160 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
+; Total bytes of code 168, prolog size 14, PerfScore 43.00, instruction count 59, allocated bytes for code 168 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -131,7 +118,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 80 (0x00050) Actual length = 160 (0x0000a0)
+  Function Length   : 84 (0x00054) Actual length = 168 (0x0000a8)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -139,7 +126,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    04          add sp, sp, #16                     ; opsize 16
-    A8 F0       pop {r4,r5,r6,r7,r11,lr}            ; opsize 32
+    05          add sp, sp, #20                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

+34 (+17.00%) : 2076.dasm - System.Linq.Enumerable:gEnumerableToArray|296_0[System.ValueTuple`2[System.Canon,System.Canon]](System.Collections.Generic.IEnumerable1[System.ValueTuple2[System.Canon,System.Canon]]):System.ValueTuple`2[System.Canon,System.__Canon] 

@@ -8,13 +8,13 @@
 ; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->   r4         single-def
-;  V01 arg0         [V01,T05] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
+;  V00 TypeCtx      [V00,T00] (  8,  8   )     int  ->   r4         single-def
+;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
 ;  V02 loc0         [V02    ] (  1,  1   )  struct (64) [sp+0x94]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.ValueTuple`2[System.__Canon,System.__Canon]]>
 ;  V03 loc1         [V03    ] (  5,  5   )  struct (136) [sp+0x0C]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
-;  V04 loc2         [V04,T14] (  2,  2   )     ref  ->   r4         class-hnd exact single-def <System.ValueTuple`2[System.__Canon,System.__Canon][]>
+;  V04 loc2         [V04,T08] (  2,  2   )     ref  ->   r5         class-hnd exact single-def <System.ValueTuple`2[System.__Canon,System.__Canon][]>
 ;# V05 OutArgs      [V05    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V06 tmp1         [V06    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V06 tmp1         [V06,T04] (  2,  4   )     int  ->   r6         "spilling helperCall"
 ;* V07 tmp2         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V08 tmp3         [V08    ] (  3,  6   )  struct ( 8) [sp+0x04]  do-not-enreg[HS] must-init hidden-struct-arg "spilled call-like call argument" <System.Span`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
 ;* V09 tmp4         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
@@ -25,16 +25,9 @@
 ;  V14 tmp9         [V14,T02] (  3,  6   )     int  ->  [sp+0x08]  do-not-enreg[H] hidden-struct-arg "field V08._length (fldOffset=0x4)" P-DEP
 ;* V15 tmp10        [V15    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V12._reference (fldOffset=0x0)" P-INDEP
 ;* V16 tmp11        [V16    ] (  0,  0   )     int  ->  zero-ref    "field V12._length (fldOffset=0x4)" P-INDEP
-;  V17 tmp12        [V17,T10] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V18 tmp13        [V18,T11] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V19 tmp14        [V19,T12] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V20 tmp15        [V20,T13] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V21 cse0         [V21,T07] (  4,  4   )     int  ->   r6         "CSE - aggressive"
-;  V22 rat0         [V22,T08] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V23 rat1         [V23,T03] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
-;  V24 rat2         [V24,T09] (  3,  4   )     int  ->   r6         "runtime lookup"
-;  V25 rat3         [V25,T04] (  3,  5.60)     int  ->   r0         "spilling expr"
-;  V26 rat4         [V26,T06] (  3,  4.48)     int  ->   r6         "fgMakeTemp is creating a new local variable"
+;  V17 tmp12        [V17,T05] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V18 tmp13        [V18,T06] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V19 tmp14        [V19,T07] (  2,  4   )     int  ->   r1         "argument with side effect"
 ;
 ; Lcl frame size = 220
 
@@ -54,70 +47,49 @@ G_M13440_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mov     r5, r1
             ; gcrRegs +[r5]
                        ;; size=34 bbWeight=1 PerfScore 13.00
-G_M13440_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M13440_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M13440_IG03:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13440_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M13440_IG04:        ; bbWeight=0.20, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M13440_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=22 bbWeight=0.20 PerfScore 1.40
-G_M13440_IG05:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            mov     r6, r0
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             add     r0, sp, 4
             add     r2, sp, 148
+            mov     r1, r6
             movs    r3, 8
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // <PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.ValueTuple`2[System.__Canon,System.__Canon]],System.ValueTuple`2[System.__Canon,System.__Canon]](byref,int):System.Span`1[System.ValueTuple`2[System.__Canon,System.__Canon]]
-                       ;; size=20 bbWeight=1 PerfScore 7.00
-G_M13440_IG06:        ; bbWeight=1, nogc, extend
+                     ;; size=64 bbWeight=1 PerfScore 21.00
+G_M13440_IG03:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x84]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x88]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M13440_IG07:        ; bbWeight=1, nogc, extend
+G_M13440_IG04:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x8C]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x90]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M13440_IG08:        ; bbWeight=1, isz, extend
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 12
-            ble     SHORT G_M13440_IG11
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M13440_IG09:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r6, [r0+0x0C]
-            cmp     r6, 0
-            beq     SHORT G_M13440_IG11
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M13440_IG10:        ; bbWeight=0.64, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13440_IG12
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M13440_IG11:        ; bbWeight=0.36, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M13440_IG05:        ; bbWeight=1, extend
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r6, r0
-                       ;; size=22 bbWeight=0.36 PerfScore 2.52
-G_M13440_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
-            mov     r1, r6
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             mov     r2, r5
             ; gcrRegs +[r2]
@@ -126,31 +98,43 @@ G_M13440_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r2 r5]
-            mov     r1, r6
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.ValueTuple`2[System.__Canon,System.__Canon]]:ToArray():System.ValueTuple`2[System.__Canon,System.__Canon][]:this
             ; gcrRegs +[r0]
-            mov     r4, r0
-            ; gcrRegs +[r4]
-            mov     r1, r6
-            add     r0, sp, 12
+            mov     r5, r0
+            ; gcrRegs +[r5]
+            mov     r0, r4
             ; gcrRegs -[r0]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
+            add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.ValueTuple`2[System.__Canon,System.__Canon]]:Dispose():this
-            mov     r0, r4
+            mov     r0, r5
             ; gcrRegs +[r0]
-                       ;; size=54 bbWeight=1 PerfScore 21.00
-G_M13440_IG13:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=114 bbWeight=1 PerfScore 39.00
+G_M13440_IG06:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 220
             pop     {r4,r5,r6,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
 
-; Total bytes of code 200, prolog size 30, PerfScore 66.76, instruction count 78, allocated bytes for code 200 (MethodHash=1d88cb7f) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)
+; Total bytes of code 234, prolog size 30, PerfScore 83.00, instruction count 83, allocated bytes for code 234 (MethodHash=1d88cb7f) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -162,7 +146,7 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 100 (0x00064) Actual length = 200 (0x0000c8)
+  Function Length   : 117 (0x00075) Actual length = 234 (0x0000ea)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----

benchmarks.run_pgo.linux.arm.checked.mch

-26 (-38.24%) : 13590.dasm - System.Linq.Enumerable:FirstOrDefaultSystem.__Canon:System.__Canon (Tier1) 

@@ -2,48 +2,33 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; Tier1 code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 loc0         [V02    ] (  1,  1   )   ubyte  ->  [sp+0x00]  do-not-enreg[X] addr-exposed ld-addr-op
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M56297_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M56297_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M56297_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M56297_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M56297_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M56297_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M56297_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M56297_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             add     r2, sp, 0
             mov     r1, r4
             ; gcrRegs +[r1]
@@ -52,13 +37,13 @@ G_M56297_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r1 r4] +[r0]
-                     ;; size=16 bbWeight=1 PerfScore 6.00
-G_M56297_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+            ; gcr arg pop 0
+                       ;; size=34 bbWeight=1 PerfScore 11.00
+G_M56297_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 68, prolog size 14, PerfScore 19.60, instruction count 24, allocated bytes for code 68 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
+; Total bytes of code 42, prolog size 4, PerfScore 15.00, instruction count 15, allocated bytes for code 42 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -70,11 +55,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 34 (0x00022) Actual length = 68 (0x000044)
+  Function Length   : 21 (0x00015) Actual length = 42 (0x00002a)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-30 (-34.09%) : 11901.dasm - System.Linq.Enumerable:IsEmptyArraySystem.__Canon:ubyte (Tier1) 

@@ -3,79 +3,63 @@
 ; Tier1 code
 ; optimized code
 ; optimized using Dynamic PGO
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; with Dynamic PGO: edge weights are valid, and fgCalledCount is 24
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V02 loc0         [V02,T05] (  3,  3   )     ref  ->   r0         class-hnd single-def <<unknown class>>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V02 loc0         [V02,T03] (  3,  3   )     ref  ->   r0         class-hnd single-def <<unknown class>>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38282_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
+                      ;; size=6 bbWeight=1 PerfScore 3.00
 G_M38282_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M38282_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38282_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M38282_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M38282_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M38282_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_ISINSTANCEOFARRAY
+            blx     r3       // CORINFO_HELP_ISINSTANCEOFINTERFACE
             ; gcrRegs -[r1 r4] +[r0]
+            ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M38282_IG08
+            beq     SHORT G_M38282_IG05
             ldr     r0, [r0+0x04]
             ; gcrRegs -[r0]
             cmp     r0, 0
-            beq     SHORT G_M38282_IG06
+            beq     SHORT G_M38282_IG03
             movs    r0, 0
-            b       SHORT G_M38282_IG07
-                       ;; size=26 bbWeight=1 PerfScore 11.00
-G_M38282_IG06:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+            b       SHORT G_M38282_IG04
+                       ;; size=44 bbWeight=1 PerfScore 16.00
+G_M38282_IG03:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 1
                        ;; size=2 bbWeight=1 PerfScore 1.00
-G_M38282_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
-G_M38282_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M38282_IG04:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
+G_M38282_IG05:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 0
                        ;; size=2 bbWeight=0 PerfScore 0.00
-G_M38282_IG09:        ; bbWeight=0, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0 PerfScore 0.00
+G_M38282_IG06:        ; bbWeight=0, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 88, prolog size 14, PerfScore 25.60, instruction count 33, allocated bytes for code 88 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
+; Total bytes of code 58, prolog size 4, PerfScore 21.00, instruction count 23, allocated bytes for code 58 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -87,7 +71,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 44 (0x0002c) Actual length = 88 (0x000058)
+  Function Length   : 29 (0x0001d) Actual length = 58 (0x00003a)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -99,7 +83,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-30 (-34.09%) : 17433.dasm - System.Linq.Enumerable:IsEmptyArraySystem.__Canon:ubyte (Tier1) 

@@ -3,79 +3,63 @@
 ; Tier1 code
 ; optimized code
 ; optimized using Dynamic PGO
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; with Dynamic PGO: edge weights are valid, and fgCalledCount is 2
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V02 loc0         [V02,T05] (  3,  3   )     ref  ->   r0         class-hnd single-def <<unknown class>>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V02 loc0         [V02,T03] (  3,  3   )     ref  ->   r0         class-hnd single-def <<unknown class>>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38282_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
+                      ;; size=6 bbWeight=1 PerfScore 3.00
 G_M38282_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M38282_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38282_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M38282_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M38282_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M38282_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_ISINSTANCEOFARRAY
+            blx     r3       // CORINFO_HELP_ISINSTANCEOFINTERFACE
             ; gcrRegs -[r1 r4] +[r0]
+            ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M38282_IG08
+            beq     SHORT G_M38282_IG05
             ldr     r0, [r0+0x04]
             ; gcrRegs -[r0]
             cmp     r0, 0
-            beq     SHORT G_M38282_IG06
+            beq     SHORT G_M38282_IG03
             movs    r0, 0
-            b       SHORT G_M38282_IG07
-                       ;; size=26 bbWeight=1 PerfScore 11.00
-G_M38282_IG06:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+            b       SHORT G_M38282_IG04
+                       ;; size=44 bbWeight=1 PerfScore 16.00
+G_M38282_IG03:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 1
                        ;; size=2 bbWeight=1 PerfScore 1.00
-G_M38282_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
-G_M38282_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M38282_IG04:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
+G_M38282_IG05:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 0
                        ;; size=2 bbWeight=0 PerfScore 0.00
-G_M38282_IG09:        ; bbWeight=0, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0 PerfScore 0.00
+G_M38282_IG06:        ; bbWeight=0, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 88, prolog size 14, PerfScore 25.60, instruction count 33, allocated bytes for code 88 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
+; Total bytes of code 58, prolog size 4, PerfScore 21.00, instruction count 23, allocated bytes for code 58 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -87,7 +71,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 44 (0x0002c) Actual length = 88 (0x000058)
+  Function Length   : 29 (0x0001d) Actual length = 58 (0x00003a)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -99,7 +83,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

+10 (+5.05%) : 20173.dasm - System.Array:IndexOfSystem.__Canon:int (Tier1) 

@@ -9,11 +9,11 @@
 ; 0 inlinees with PGO data; 2 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T02] (  5,  4.36)     int  ->   r0         single-def
+;  V00 TypeCtx      [V00,T02] (  5,  5   )     int  ->   r6         single-def
 ;  V01 arg0         [V01,T00] (  6,  5   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
-;  V02 arg1         [V02,T05] (  4,  3   )     ref  ->   r6         ld-addr-op class-hnd single-def <System.__Canon>
+;  V02 arg1         [V02,T04] (  4,  3   )     ref  ->   r7         ld-addr-op class-hnd single-def <System.__Canon>
 ;  V03 arg2         [V03,T01] (  6,  5   )     int  ->   r5         single-def
-;  V04 arg3         [V04,T09] (  3,  2   )     int  ->   r7         single-def
+;  V04 arg3         [V04,T06] (  3,  2   )     int  ->   r8         single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -23,61 +23,48 @@
 ;* V11 tmp2         [V11    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V12 tmp3         [V12,T03] (  5,  6   )     ref  ->   r0         class-hnd single-def "spilling ret_expr" <System.Collections.Generic.EqualityComparer`1[System.__Canon]>
 ;* V13 tmp4         [V13    ] (  0,  0   )     int  ->  zero-ref   
-;  V14 tmp5         [V14,T10] (  3,  2   )     int  ->   r0         "guarded devirt return temp"
+;  V14 tmp5         [V14,T07] (  3,  2   )     int  ->   r0         "guarded devirt return temp"
 ;* V15 tmp6         [V15    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.Collections.Generic.ObjectEqualityComparer`1[System.Diagnostics.Metrics.Instrument]>
 ;* V16 tmp7         [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V17 tmp8         [V17    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
-;  V18 cse0         [V18,T08] (  3,  3   )     int  ->   r1         "CSE - aggressive"
-;  V19 rat0         [V19,T07] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V20 rat1         [V20,T04] (  3,  5.60)     int  ->   r1         "spilling expr"
-;  V21 rat2         [V21,T06] (  3,  4.48)     int  ->   r1         "fgMakeTemp is creating a new local variable"
+;  V18 cse0         [V18,T05] (  3,  3   )     int  ->   r0         "CSE - aggressive"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 20
 
 G_M13831_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r11,lr}
-            sub     sp, 16
-            add     r11, sp, 32
-            str     r0, [r11-0x14]
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 20
+            add     r11, sp, 40
+            str     r0, [r11-0x1C]
+            mov     r6, r0
             mov     r4, r1
             ; gcrRegs +[r4]
-            mov     r6, r2
-            ; gcrRegs +[r6]
+            mov     r7, r2
+            ; gcrRegs +[r7]
             mov     r5, r3
-            ldr     r7, [sp+0x28]
-                       ;; size=22 bbWeight=1 PerfScore 8.00
-G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
+            ldr     r8, [sp+0x30]
+                       ;; size=26 bbWeight=1 PerfScore 9.00
+G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0090 {r4 r7}, byrefRegs=0000 {}, byref, isz
             cmp     r4, 0
-            beq     SHORT G_M13831_IG08
-            ldr     r1, [r4+0x04]
-            cmp     r1, r5
-            blo     SHORT G_M13831_IG09
-            subs    r1, r1, r5
-            cmp     r1, r7
-            blo     SHORT G_M13831_IG10
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x04]
-            cmp     r3, 12
-            ble     SHORT G_M13831_IG05
-                       ;; size=24 bbWeight=1 PerfScore 12.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r1+0x0C]
-            cmp     r1, 0
-            beq     SHORT G_M13831_IG05
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
+            beq     SHORT G_M13831_IG04
+            ldr     r0, [r4+0x04]
+            cmp     r0, r5
+            blo     SHORT G_M13831_IG05
+            subs    r0, r0, r5
+            cmp     r0, r8
+            blo     SHORT G_M13831_IG06
+            mov     r0, r6
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.36 PerfScore 2.16
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r0, r6
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -87,24 +74,24 @@ G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, b
             movw    r2, 0xd1ff
             movt    r2, 0xd1ff
             cmp     r1, r2
-            bne     SHORT G_M13831_IG11
-            str     r7, [sp]
+            bne     SHORT G_M13831_IG07
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
             mov     r3, r5
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // System.Collections.Generic.ObjectEqualityComparer`1[System.__Canon]:IndexOf(System.__Canon[],System.__Canon,int,int):int:this
-            ; gcrRegs -[r0-r2 r4 r6]
-                       ;; size=50 bbWeight=1 PerfScore 18.00
-G_M13831_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 16
-            pop     {r4,r5,r6,r7,r11,pc}
+            ; gcrRegs -[r0-r2 r4 r7]
+                       ;; size=106 bbWeight=1 PerfScore 37.00
+G_M13831_IG03:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            add     sp, 20
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 2
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -112,37 +99,37 @@ G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             blx     r3     // System.ThrowHelper:ThrowArgumentNullException(int)
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowCountArgumentOutOfRange_ArgumentOutOfRange_Count()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG11:        ; bbWeight=0, gcrefRegs=0051 {r0 r4 r6}, byrefRegs=0000 {}, byref, isz
-            ; gcrRegs +[r0 r4 r6]
-            str     r7, [sp]
+G_M13831_IG07:        ; bbWeight=0, gcrefRegs=0091 {r0 r4 r7}, byrefRegs=0000 {}, byref, isz
+            ; gcrRegs +[r0 r4 r7]
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
             mov     r3, r5
             ldr     lr, [r0]
             ldr     lr, [lr+0x30]
             ldr     lr, [lr]
             blx     lr     // <unknown method>
-            ; gcrRegs -[r0-r2 r4 r6]
-            b       SHORT G_M13831_IG07
-                       ;; size=24 bbWeight=0 PerfScore 0.00
+            ; gcrRegs -[r0-r2 r4 r7]
+            b       SHORT G_M13831_IG03
+                       ;; size=26 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 198, prolog size 14, PerfScore 45.20, instruction count 75, allocated bytes for code 198 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
+; Total bytes of code 208, prolog size 14, PerfScore 48.00, instruction count 73, allocated bytes for code 208 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -154,7 +141,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 99 (0x00063) Actual length = 198 (0x0000c6)
+  Function Length   : 104 (0x00068) Actual length = 208 (0x0000d0)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -162,7 +149,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    04          add sp, sp, #16                     ; opsize 16
-    A8 F0       pop {r4,r5,r6,r7,r11,lr}            ; opsize 32
+    05          add sp, sp, #20                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

+10 (+5.05%) : 21951.dasm - System.Array:IndexOfSystem.__Canon:int (Tier1) 

@@ -9,11 +9,11 @@
 ; 0 inlinees with PGO data; 2 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T02] (  5,  4.36)     int  ->   r0         single-def
+;  V00 TypeCtx      [V00,T02] (  5,  5   )     int  ->   r6         single-def
 ;  V01 arg0         [V01,T00] (  6,  5   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
-;  V02 arg1         [V02,T05] (  4,  3   )     ref  ->   r6         ld-addr-op class-hnd single-def <System.__Canon>
+;  V02 arg1         [V02,T04] (  4,  3   )     ref  ->   r7         ld-addr-op class-hnd single-def <System.__Canon>
 ;  V03 arg2         [V03,T01] (  6,  5   )     int  ->   r5         single-def
-;  V04 arg3         [V04,T09] (  3,  2   )     int  ->   r7         single-def
+;  V04 arg3         [V04,T06] (  3,  2   )     int  ->   r8         single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -23,61 +23,48 @@
 ;* V11 tmp2         [V11    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V12 tmp3         [V12,T03] (  5,  6   )     ref  ->   r0         class-hnd single-def "spilling ret_expr" <System.Collections.Generic.EqualityComparer`1[System.__Canon]>
 ;* V13 tmp4         [V13    ] (  0,  0   )     int  ->  zero-ref   
-;  V14 tmp5         [V14,T10] (  3,  2   )     int  ->   r0         "guarded devirt return temp"
+;  V14 tmp5         [V14,T07] (  3,  2   )     int  ->   r0         "guarded devirt return temp"
 ;* V15 tmp6         [V15    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.Collections.Generic.ObjectEqualityComparer`1[System.Object]>
 ;* V16 tmp7         [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V17 tmp8         [V17    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
-;  V18 cse0         [V18,T08] (  3,  3   )     int  ->   r1         "CSE - aggressive"
-;  V19 rat0         [V19,T07] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V20 rat1         [V20,T04] (  3,  5.60)     int  ->   r1         "spilling expr"
-;  V21 rat2         [V21,T06] (  3,  4.48)     int  ->   r1         "fgMakeTemp is creating a new local variable"
+;  V18 cse0         [V18,T05] (  3,  3   )     int  ->   r0         "CSE - aggressive"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 20
 
 G_M13831_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r11,lr}
-            sub     sp, 16
-            add     r11, sp, 32
-            str     r0, [r11-0x14]
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 20
+            add     r11, sp, 40
+            str     r0, [r11-0x1C]
+            mov     r6, r0
             mov     r4, r1
             ; gcrRegs +[r4]
-            mov     r6, r2
-            ; gcrRegs +[r6]
+            mov     r7, r2
+            ; gcrRegs +[r7]
             mov     r5, r3
-            ldr     r7, [sp+0x28]
-                       ;; size=22 bbWeight=1 PerfScore 8.00
-G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
+            ldr     r8, [sp+0x30]
+                       ;; size=26 bbWeight=1 PerfScore 9.00
+G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0090 {r4 r7}, byrefRegs=0000 {}, byref, isz
             cmp     r4, 0
-            beq     SHORT G_M13831_IG08
-            ldr     r1, [r4+0x04]
-            cmp     r1, r5
-            blo     SHORT G_M13831_IG09
-            subs    r1, r1, r5
-            cmp     r1, r7
-            blo     SHORT G_M13831_IG10
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x04]
-            cmp     r3, 12
-            ble     SHORT G_M13831_IG05
-                       ;; size=24 bbWeight=1 PerfScore 12.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r1+0x0C]
-            cmp     r1, 0
-            beq     SHORT G_M13831_IG05
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
+            beq     SHORT G_M13831_IG04
+            ldr     r0, [r4+0x04]
+            cmp     r0, r5
+            blo     SHORT G_M13831_IG05
+            subs    r0, r0, r5
+            cmp     r0, r8
+            blo     SHORT G_M13831_IG06
+            mov     r0, r6
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.36 PerfScore 2.16
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r0, r6
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -87,24 +74,24 @@ G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, b
             movw    r2, 0xd1ff
             movt    r2, 0xd1ff
             cmp     r1, r2
-            bne     SHORT G_M13831_IG11
-            str     r7, [sp]
+            bne     SHORT G_M13831_IG07
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
             mov     r3, r5
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // System.Collections.Generic.ObjectEqualityComparer`1[System.__Canon]:IndexOf(System.__Canon[],System.__Canon,int,int):int:this
-            ; gcrRegs -[r0-r2 r4 r6]
-                       ;; size=50 bbWeight=1 PerfScore 18.00
-G_M13831_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 16
-            pop     {r4,r5,r6,r7,r11,pc}
+            ; gcrRegs -[r0-r2 r4 r7]
+                       ;; size=106 bbWeight=1 PerfScore 37.00
+G_M13831_IG03:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            add     sp, 20
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 2
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -112,37 +99,37 @@ G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             blx     r3     // System.ThrowHelper:ThrowArgumentNullException(int)
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowCountArgumentOutOfRange_ArgumentOutOfRange_Count()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG11:        ; bbWeight=0, gcrefRegs=0051 {r0 r4 r6}, byrefRegs=0000 {}, byref, isz
-            ; gcrRegs +[r0 r4 r6]
-            str     r7, [sp]
+G_M13831_IG07:        ; bbWeight=0, gcrefRegs=0091 {r0 r4 r7}, byrefRegs=0000 {}, byref, isz
+            ; gcrRegs +[r0 r4 r7]
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
             mov     r3, r5
             ldr     lr, [r0]
             ldr     lr, [lr+0x30]
             ldr     lr, [lr]
             blx     lr     // <unknown method>
-            ; gcrRegs -[r0-r2 r4 r6]
-            b       SHORT G_M13831_IG07
-                       ;; size=24 bbWeight=0 PerfScore 0.00
+            ; gcrRegs -[r0-r2 r4 r7]
+            b       SHORT G_M13831_IG03
+                       ;; size=26 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 198, prolog size 14, PerfScore 45.20, instruction count 75, allocated bytes for code 198 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
+; Total bytes of code 208, prolog size 14, PerfScore 48.00, instruction count 73, allocated bytes for code 208 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -154,7 +141,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 99 (0x00063) Actual length = 198 (0x0000c6)
+  Function Length   : 104 (0x00068) Actual length = 208 (0x0000d0)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -162,7 +149,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    04          add sp, sp, #16                     ; opsize 16
-    A8 F0       pop {r4,r5,r6,r7,r11,lr}            ; opsize 32
+    05          add sp, sp, #20                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

+10 (+5.05%) : 23083.dasm - System.Array:IndexOfSystem.__Canon:int (Tier1) 

@@ -9,11 +9,11 @@
 ; 0 inlinees with PGO data; 2 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T02] (  5,  4.36)     int  ->   r0         single-def
+;  V00 TypeCtx      [V00,T02] (  5,  5   )     int  ->   r6         single-def
 ;  V01 arg0         [V01,T00] (  6,  5   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
-;  V02 arg1         [V02,T05] (  4,  3   )     ref  ->   r6         ld-addr-op class-hnd single-def <System.__Canon>
+;  V02 arg1         [V02,T04] (  4,  3   )     ref  ->   r7         ld-addr-op class-hnd single-def <System.__Canon>
 ;  V03 arg2         [V03,T01] (  6,  5   )     int  ->   r5         single-def
-;  V04 arg3         [V04,T09] (  3,  2   )     int  ->   r7         single-def
+;  V04 arg3         [V04,T06] (  3,  2   )     int  ->   r8         single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -23,61 +23,48 @@
 ;* V11 tmp2         [V11    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V12 tmp3         [V12,T03] (  5,  6   )     ref  ->   r0         class-hnd single-def "spilling ret_expr" <System.Collections.Generic.EqualityComparer`1[System.__Canon]>
 ;* V13 tmp4         [V13    ] (  0,  0   )     int  ->  zero-ref   
-;  V14 tmp5         [V14,T10] (  3,  2   )     int  ->   r0         "guarded devirt return temp"
+;  V14 tmp5         [V14,T07] (  3,  2   )     int  ->   r0         "guarded devirt return temp"
 ;* V15 tmp6         [V15    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.Collections.Generic.ObjectEqualityComparer`1[System.Object]>
 ;* V16 tmp7         [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V17 tmp8         [V17    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
-;  V18 cse0         [V18,T08] (  3,  3   )     int  ->   r1         "CSE - aggressive"
-;  V19 rat0         [V19,T07] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V20 rat1         [V20,T04] (  3,  5.60)     int  ->   r1         "spilling expr"
-;  V21 rat2         [V21,T06] (  3,  4.48)     int  ->   r1         "fgMakeTemp is creating a new local variable"
+;  V18 cse0         [V18,T05] (  3,  3   )     int  ->   r0         "CSE - aggressive"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 20
 
 G_M13831_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r11,lr}
-            sub     sp, 16
-            add     r11, sp, 32
-            str     r0, [r11-0x14]
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 20
+            add     r11, sp, 40
+            str     r0, [r11-0x1C]
+            mov     r6, r0
             mov     r4, r1
             ; gcrRegs +[r4]
-            mov     r6, r2
-            ; gcrRegs +[r6]
+            mov     r7, r2
+            ; gcrRegs +[r7]
             mov     r5, r3
-            ldr     r7, [sp+0x28]
-                       ;; size=22 bbWeight=1 PerfScore 8.00
-G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
+            ldr     r8, [sp+0x30]
+                       ;; size=26 bbWeight=1 PerfScore 9.00
+G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0090 {r4 r7}, byrefRegs=0000 {}, byref, isz
             cmp     r4, 0
-            beq     SHORT G_M13831_IG08
-            ldr     r1, [r4+0x04]
-            cmp     r1, r5
-            blo     SHORT G_M13831_IG09
-            subs    r1, r1, r5
-            cmp     r1, r7
-            blo     SHORT G_M13831_IG10
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x04]
-            cmp     r3, 12
-            ble     SHORT G_M13831_IG05
-                       ;; size=24 bbWeight=1 PerfScore 12.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r1+0x0C]
-            cmp     r1, 0
-            beq     SHORT G_M13831_IG05
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
+            beq     SHORT G_M13831_IG04
+            ldr     r0, [r4+0x04]
+            cmp     r0, r5
+            blo     SHORT G_M13831_IG05
+            subs    r0, r0, r5
+            cmp     r0, r8
+            blo     SHORT G_M13831_IG06
+            mov     r0, r6
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.36 PerfScore 2.16
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r0, r6
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -87,24 +74,24 @@ G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, b
             movw    r2, 0xd1ff
             movt    r2, 0xd1ff
             cmp     r1, r2
-            bne     SHORT G_M13831_IG11
-            str     r7, [sp]
+            bne     SHORT G_M13831_IG07
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
             mov     r3, r5
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // System.Collections.Generic.ObjectEqualityComparer`1[System.__Canon]:IndexOf(System.__Canon[],System.__Canon,int,int):int:this
-            ; gcrRegs -[r0-r2 r4 r6]
-                       ;; size=50 bbWeight=1 PerfScore 18.00
-G_M13831_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 16
-            pop     {r4,r5,r6,r7,r11,pc}
+            ; gcrRegs -[r0-r2 r4 r7]
+                       ;; size=106 bbWeight=1 PerfScore 37.00
+G_M13831_IG03:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            add     sp, 20
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 2
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -112,37 +99,37 @@ G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             blx     r3     // System.ThrowHelper:ThrowArgumentNullException(int)
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowCountArgumentOutOfRange_ArgumentOutOfRange_Count()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG11:        ; bbWeight=0, gcrefRegs=0051 {r0 r4 r6}, byrefRegs=0000 {}, byref, isz
-            ; gcrRegs +[r0 r4 r6]
-            str     r7, [sp]
+G_M13831_IG07:        ; bbWeight=0, gcrefRegs=0091 {r0 r4 r7}, byrefRegs=0000 {}, byref, isz
+            ; gcrRegs +[r0 r4 r7]
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
             mov     r3, r5
             ldr     lr, [r0]
             ldr     lr, [lr+0x30]
             ldr     lr, [lr]
             blx     lr     // <unknown method>
-            ; gcrRegs -[r0-r2 r4 r6]
-            b       SHORT G_M13831_IG07
-                       ;; size=24 bbWeight=0 PerfScore 0.00
+            ; gcrRegs -[r0-r2 r4 r7]
+            b       SHORT G_M13831_IG03
+                       ;; size=26 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 198, prolog size 14, PerfScore 45.20, instruction count 75, allocated bytes for code 198 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
+; Total bytes of code 208, prolog size 14, PerfScore 48.00, instruction count 73, allocated bytes for code 208 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -154,7 +141,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 99 (0x00063) Actual length = 198 (0x0000c6)
+  Function Length   : 104 (0x00068) Actual length = 208 (0x0000d0)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -162,7 +149,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    04          add sp, sp, #16                     ; opsize 16
-    A8 F0       pop {r4,r5,r6,r7,r11,lr}            ; opsize 32
+    05          add sp, sp, #20                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

benchmarks.run_tiered.linux.arm.checked.mch

-26 (-38.24%) : 15817.dasm - System.Linq.Enumerable:FirstOrDefaultSystem.__Canon:System.__Canon (Tier1) 

@@ -2,48 +2,33 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; Tier1 code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 loc0         [V02    ] (  1,  1   )   ubyte  ->  [sp+0x00]  do-not-enreg[X] addr-exposed ld-addr-op
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M56297_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M56297_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M56297_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M56297_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M56297_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M56297_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M56297_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M56297_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             add     r2, sp, 0
             mov     r1, r4
             ; gcrRegs +[r1]
@@ -52,13 +37,13 @@ G_M56297_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r1 r4] +[r0]
-                     ;; size=16 bbWeight=1 PerfScore 6.00
-G_M56297_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+            ; gcr arg pop 0
+                       ;; size=34 bbWeight=1 PerfScore 11.00
+G_M56297_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 68, prolog size 14, PerfScore 19.60, instruction count 24, allocated bytes for code 68 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
+; Total bytes of code 42, prolog size 4, PerfScore 15.00, instruction count 15, allocated bytes for code 42 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -70,11 +55,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 34 (0x00022) Actual length = 68 (0x000044)
+  Function Length   : 21 (0x00015) Actual length = 42 (0x00002a)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-30 (-34.09%) : 2710.dasm - System.Linq.Enumerable:IsEmptyArraySystem.__Canon:ubyte (Tier1) 

@@ -2,81 +2,65 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; Tier1 code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V02 loc0         [V02,T05] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V02 loc0         [V02,T03] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38282_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
+                      ;; size=6 bbWeight=1 PerfScore 3.00
 G_M38282_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M38282_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38282_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M38282_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M38282_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M38282_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_ISINSTANCEOFARRAY
+            blx     r3       // CORINFO_HELP_ISINSTANCEOFINTERFACE
             ; gcrRegs -[r1 r4] +[r0]
+            ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M38282_IG09
-                       ;; size=16 bbWeight=1 PerfScore 6.00
-G_M38282_IG06:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
+            beq     SHORT G_M38282_IG06
+                       ;; size=34 bbWeight=1 PerfScore 11.00
+G_M38282_IG03:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
             ldr     r0, [r0+0x04]
             ; gcrRegs -[r0]
             cmp     r0, 0
-            beq     SHORT G_M38282_IG07
+            beq     SHORT G_M38282_IG04
             movs    r0, 0
-            b       SHORT G_M38282_IG08
+            b       SHORT G_M38282_IG05
                      ;; size=10 bbWeight=0.50 PerfScore 2.50
-G_M38282_IG07:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M38282_IG04:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 1
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG08:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
-G_M38282_IG09:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M38282_IG05:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
+G_M38282_IG06:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 0
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG10:        ; bbWeight=0.50, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
+G_M38282_IG07:        ; bbWeight=0.50, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
 
-; Total bytes of code 88, prolog size 14, PerfScore 23.10, instruction count 33, allocated bytes for code 88 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
+; Total bytes of code 58, prolog size 4, PerfScore 18.50, instruction count 23, allocated bytes for code 58 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -88,7 +72,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 44 (0x0002c) Actual length = 88 (0x000058)
+  Function Length   : 29 (0x0001d) Actual length = 58 (0x00003a)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -100,7 +84,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-22 (-33.33%) : 2931.dasm - BenchmarkDotNet.Characteristics.CharacteristicObject1[System.__Canon]:CreateCharacteristic[ubyte](System.String):BenchmarkDotNet.Characteristics.Characteristic1ubyte 

@@ -2,78 +2,69 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; Tier1 code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; fully interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.String>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.String>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V03 tmp1         [V03    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V04 tmp2         [V04,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V05 rat0         [V05,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V06 rat1         [V06,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V04 tmp2         [V04,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M42409_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M42409_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M42409_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M42409_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M42409_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M42409_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M42409_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-                     ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M42409_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-                     ;; size=12 bbWeight=1 PerfScore 4.00
-G_M42409_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,lr}
+                      ;; size=30 bbWeight=1 PerfScore 9.00
+G_M42409_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 8
+            pop     {r4,lr}
             bx      r3      // BenchmarkDotNet.Characteristics.Characteristic:Create[System.__Canon,ubyte](System.String):BenchmarkDotNet.Characteristics.Characteristic`1[ubyte]
             ; gcr arg pop 0
                        ;; size=8 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 66, prolog size 16, PerfScore 18.60, instruction count 23, allocated bytes for code 66 (MethodHash=8f1b5a56) for method BenchmarkDotNet.Characteristics.CharacteristicObject`1[System.__Canon]:CreateCharacteristic[ubyte](System.String):BenchmarkDotNet.Characteristics.Characteristic`1[ubyte] (Tier1)
+; Total bytes of code 44, prolog size 6, PerfScore 15.00, instruction count 15, allocated bytes for code 44 (MethodHash=8f1b5a56) for method BenchmarkDotNet.Characteristics.CharacteristicObject`1[System.__Canon]:CreateCharacteristic[ubyte](System.String):BenchmarkDotNet.Characteristics.Characteristic`1[ubyte] (Tier1)
 ; ============================================================
 
 Unwind Info:
   >> Start offset   : 0x000000 (not in unwind data)
   >>   End offset   : 0xd1ffab1e (not in unwind data)
-  Code Words        : 1
-  Epilog Count      : 0
+  Code Words        : 2
+  Epilog Count      : 1
   F bit             : 0
-  E bit             : 1
+  E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 33 (0x00021) Actual length = 66 (0x000042)
-  --- One epilog, unwind codes at 0
+  Function Length   : 22 (0x00016) Actual length = 44 (0x00002c)
+  ---- Epilog scopes ----
+  ---- Scope 0
+  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
+  Condition                  : 14 (0xe) (always)
+  Epilog Start Index         : 3 (0x03)
   ---- Unwind codes ----
-    ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
+    ---- Epilog start at index 3 ----
+    02          add sp, sp, #8                      ; opsize 16
+    A0 10       pop {r4,lr}                         ; opsize 32
+    FF          end
     FF          end

+8 (+5.00%) : 4206.dasm - System.Array:IndexOfSystem.__Canon:int (Tier1) 

@@ -8,11 +8,11 @@
 ; 0 inlinees with PGO data; 2 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T02] (  5,  4.36)     int  ->   r0         single-def
+;  V00 TypeCtx      [V00,T01] (  5,  5   )     int  ->   r5         single-def
 ;  V01 arg0         [V01,T00] (  5,  5   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
-;  V02 arg1         [V02,T05] (  3,  3   )     ref  ->   r6         ld-addr-op class-hnd single-def <System.__Canon>
-;  V03 arg2         [V03,T01] (  5,  5   )     int  ->   r5         single-def
-;  V04 arg3         [V04,T09] (  2,  2   )     int  ->   r7         single-def
+;  V02 arg1         [V02,T04] (  3,  3   )     ref  ->   r7         ld-addr-op class-hnd single-def <System.__Canon>
+;  V03 arg2         [V03,T02] (  5,  5   )     int  ->   r6         single-def
+;  V04 arg3         [V04,T06] (  2,  2   )     int  ->   r8         single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -24,79 +24,66 @@
 ;* V13 tmp4         [V13    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V14 tmp5         [V14    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;  V15 tmp6         [V15,T03] (  3,  6   )     ref  ->   r0         single-def "argument with side effect"
-;  V16 cse0         [V16,T08] (  3,  3   )     int  ->   r1         "CSE - aggressive"
-;  V17 rat0         [V17,T07] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V18 rat1         [V18,T04] (  3,  5.60)     int  ->   r1         "spilling expr"
-;  V19 rat2         [V19,T06] (  3,  4.48)     int  ->   r1         "fgMakeTemp is creating a new local variable"
+;  V16 cse0         [V16,T05] (  3,  3   )     int  ->   r0         "CSE - aggressive"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 20
 
 G_M13831_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r11,lr}
-            sub     sp, 16
-            add     r11, sp, 32
-            str     r0, [r11-0x14]
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 20
+            add     r11, sp, 40
+            str     r0, [r11-0x1C]
+            mov     r5, r0
             mov     r4, r1
             ; gcrRegs +[r4]
-            mov     r6, r2
-            ; gcrRegs +[r6]
-            mov     r5, r3
-            ldr     r7, [sp+0x28]
-                       ;; size=22 bbWeight=1 PerfScore 8.00
-G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
+            mov     r7, r2
+            ; gcrRegs +[r7]
+            mov     r6, r3
+            ldr     r8, [sp+0x30]
+                       ;; size=26 bbWeight=1 PerfScore 9.00
+G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0090 {r4 r7}, byrefRegs=0000 {}, byref, isz
             cmp     r4, 0
-            beq     SHORT G_M13831_IG08
-            ldr     r1, [r4+0x04]
-            cmp     r1, r5
-            blo     SHORT G_M13831_IG09
-            subs    r1, r1, r5
-            cmp     r1, r7
-            blo     SHORT G_M13831_IG10
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x04]
-            cmp     r3, 12
-            ble     SHORT G_M13831_IG05
-                       ;; size=24 bbWeight=1 PerfScore 12.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r1+0x0C]
-            cmp     r1, 0
-            beq     SHORT G_M13831_IG05
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
+            beq     SHORT G_M13831_IG04
+            ldr     r0, [r4+0x04]
+            cmp     r0, r6
+            blo     SHORT G_M13831_IG05
+            subs    r0, r0, r6
+            cmp     r0, r8
+            blo     SHORT G_M13831_IG06
+            mov     r0, r5
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.36 PerfScore 2.16
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r0, r5
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.EqualityComparer`1[System.__Canon]:get_Default():System.Collections.Generic.EqualityComparer`1[System.__Canon]
             ; gcrRegs +[r0]
-            str     r7, [sp]
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
-            mov     r3, r5
+            mov     r3, r6
             ldr     lr, [r0]
             ldr     lr, [lr+0x30]
             ldr     lr, [lr]
             blx     lr     // <unknown method>
-            ; gcrRegs -[r0-r2 r4 r6]
-                       ;; size=36 bbWeight=1 PerfScore 13.00
-G_M13831_IG07:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 16
-            pop     {r4,r5,r6,r7,r11,pc}
+            ; gcrRegs -[r0-r2 r4 r7]
+                       ;; size=92 bbWeight=1 PerfScore 32.00
+G_M13831_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 20
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 2
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -104,14 +91,14 @@ G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             blx     r3     // System.ThrowHelper:ThrowArgumentNullException(int)
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -119,7 +106,7 @@ G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 160, prolog size 14, PerfScore 40.20, instruction count 61, allocated bytes for code 160 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
+; Total bytes of code 168, prolog size 14, PerfScore 43.00, instruction count 59, allocated bytes for code 168 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -131,7 +118,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 80 (0x00050) Actual length = 160 (0x0000a0)
+  Function Length   : 84 (0x00054) Actual length = 168 (0x0000a8)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -139,7 +126,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    04          add sp, sp, #16                     ; opsize 16
-    A8 F0       pop {r4,r5,r6,r7,r11,lr}            ; opsize 32
+    05          add sp, sp, #20                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

+8 (+7.27%) : 12133.dasm - System.RuntimeType+RuntimeTypeCache:GetMemberCacheSystem.__Canon:System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1) 

@@ -8,92 +8,84 @@
 ; 0 inlinees with PGO data; 3 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T03] (  3,  2.50)     ref  ->   r5         this class-hnd single-def <System.RuntimeType+RuntimeTypeCache>
-;  V01 TypeCtx      [V01,T00] (  5,  3.60)     int  ->   r1         single-def
-;  V02 arg1         [V02,T01] (  4,  3.50)   byref  ->   r4         single-def
+;  V00 this         [V00,T03] (  3,  2.50)     ref  ->   r6         this class-hnd single-def <System.RuntimeType+RuntimeTypeCache>
+;  V01 TypeCtx      [V01,T00] (  5,  4   )     int  ->   r4         single-def
+;  V02 arg1         [V02,T01] (  4,  3.50)   byref  ->   r5         single-def
 ;  V03 loc0         [V03,T02] (  6,  4.50)     ref  ->   r0         class-hnd <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
 ;* V04 loc1         [V04    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
 ;# V05 OutArgs      [V05    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V06 tmp1         [V06,T04] (  4,  4   )     ref  ->   r6         class-hnd exact single-def "NewObj constructor temp" <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
+;  V06 tmp1         [V06,T04] (  4,  4   )     ref  ->   r7         class-hnd exact single-def "NewObj constructor temp" <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
 ;* V07 tmp2         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V08 tmp3         [V08    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V09 rat0         [V09,T06] (  3,  2   )     int  ->   r0         "runtime lookup"
-;  V10 rat1         [V10,T05] (  3,  2.80)     int  ->   r0         "fgMakeTemp is creating a new local variable"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M58319_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r11,lr}
-            sub     sp, 12
+            push    {r2,r3,r4,r5,r6,r7,r11,lr}
             add     r11, sp, 24
             str     r1, [r11-0x14]
-            mov     r5, r0
-            ; gcrRegs +[r5]
-            mov     r4, r2
-            ; byrRegs +[r4]
+            mov     r6, r0
+            ; gcrRegs +[r6]
+            mov     r4, r1
+            mov     r5, r2
+            ; byrRegs +[r5]
                         ;; size=18 bbWeight=1 PerfScore 6.00
-G_M58319_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0010 {r4}, byref, isz
-            ldr     r0, [r4]
+G_M58319_IG02:        ; bbWeight=1, gcrefRegs=0040 {r6}, byrefRegs=0020 {r5}, byref, isz
+            ldr     r0, [r5]
             ; gcrRegs +[r0]
             cmp     r0, 0
-            bne     SHORT G_M58319_IG07
+            bne     SHORT G_M58319_IG04
                         ;; size=6 bbWeight=1 PerfScore 3.00
-G_M58319_IG03:        ; bbWeight=0.50, gcrefRegs=0020 {r5}, byrefRegs=0010 {r4}, byref, isz
+G_M58319_IG03:        ; bbWeight=0.50, gcrefRegs=0040 {r6}, byrefRegs=0020 {r5}, byref, isz
             ; gcrRegs -[r0]
-            ldr     r0, [r1+0x20]
-            ldr     r0, [r0+0x08]
-            cmp     r0, 0
-            beq     SHORT G_M58319_IG05
-                       ;; size=8 bbWeight=0.50 PerfScore 2.00
-G_M58319_IG04:        ; bbWeight=0.40, gcrefRegs=0020 {r5}, byrefRegs=0010 {r4}, byref, isz
-            b       SHORT G_M58319_IG06
-                       ;; size=2 bbWeight=0.40 PerfScore 0.40
-G_M58319_IG05:        ; bbWeight=0.10, gcrefRegs=0020 {r5}, byrefRegs=0010 {r4}, byref
-            mov     r0, r1
+            mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=20 bbWeight=0.10 PerfScore 0.60
-G_M58319_IG06:        ; bbWeight=0.50, gcrefRegs=0020 {r5}, byrefRegs=0010 {r4}, byref, isz
+            blx     r3        // CORINFO_HELP_MEMCPY
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
-            mov     r6, r0
-            ; gcrRegs +[r6]
-            add     r0, r6, 8
+            mov     r7, r0
+            ; gcrRegs +[r7]
+            add     r0, r7, 8
             ; gcrRegs -[r0]
             ; byrRegs +[r0]
-            mov     r1, r5
+            mov     r1, r6
             ; gcrRegs +[r1]
             movw    r12, 0xd1ff
             movt    r12, 0xd1ff
             blx     r12        // CORINFO_HELP_ASSIGN_REF
-            ; gcrRegs -[r1 r5]
+            ; gcrRegs -[r1 r6]
             ; byrRegs -[r0]
             mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r0, r5
             ; byrRegs +[r0]
-            mov     r1, r6
+            mov     r1, r7
             ; gcrRegs +[r1]
             movs    r2, 0
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             blx     r3     // <unknown method>
             ; gcrRegs -[r1] +[r0]
-            ; byrRegs -[r0 r4]
+            ; byrRegs -[r0 r5]
             cmp     r0, 0
-            bne     SHORT G_M58319_IG07
-            mov     r0, r6
-                       ;; size=50 bbWeight=0.50 PerfScore 9.00
-G_M58319_IG07:        ; bbWeight=1, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, epilog, nogc
-            ; gcrRegs -[r6]
-            add     sp, 12
-            pop     {r4,r5,r6,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+            bne     SHORT G_M58319_IG04
+            mov     r0, r7
+                       ;; size=90 bbWeight=0.50 PerfScore 15.00
+G_M58319_IG04:        ; bbWeight=1, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, epilog, nogc
+            ; gcrRegs -[r7]
+            pop     {r2,r3,r4,r5,r6,r7,r11,pc}
+                       ;; size=4 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 110, prolog size 14, PerfScore 23.00, instruction count 40, allocated bytes for code 110 (MethodHash=863b1c30) for method System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)
+; Total bytes of code 118, prolog size 12, PerfScore 25.00, instruction count 40, allocated bytes for code 118 (MethodHash=863b1c30) for method System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -105,11 +97,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 55 (0x00037) Actual length = 110 (0x00006e)
+  Function Length   : 59 (0x0003b) Actual length = 118 (0x000076)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 70       pop {r4,r5,r6,r11,lr}               ; opsize 32
+    A8 FC       pop {r2,r3,r4,r5,r6,r7,r11,lr}      ; opsize 32
+    FF          end
     FF          end

+34 (+17.00%) : 16790.dasm - System.Linq.Enumerable:gEnumerableToArray|296_0System.__Canon:System.Canon 

@@ -8,13 +8,13 @@
 ; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->   r4         single-def
-;  V01 arg0         [V01,T05] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  8,  8   )     int  ->   r4         single-def
+;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 loc0         [V02    ] (  1,  1   )  struct (32) [sp+0x94]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon]>
 ;  V03 loc1         [V03    ] (  5,  5   )  struct (136) [sp+0x0C]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]>
-;  V04 loc2         [V04,T14] (  2,  2   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
+;  V04 loc2         [V04,T08] (  2,  2   )     ref  ->   r5         class-hnd single-def <System.__Canon[]>
 ;# V05 OutArgs      [V05    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V06 tmp1         [V06    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V06 tmp1         [V06,T04] (  2,  4   )     int  ->   r6         "spilling helperCall"
 ;* V07 tmp2         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V08 tmp3         [V08    ] (  3,  6   )  struct ( 8) [sp+0x04]  do-not-enreg[HS] must-init hidden-struct-arg "spilled call-like call argument" <System.Span`1[System.__Canon]>
 ;* V09 tmp4         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
@@ -25,16 +25,9 @@
 ;  V14 tmp9         [V14,T02] (  3,  6   )     int  ->  [sp+0x08]  do-not-enreg[H] hidden-struct-arg "field V08._length (fldOffset=0x4)" P-DEP
 ;* V15 tmp10        [V15    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V12._reference (fldOffset=0x0)" P-INDEP
 ;* V16 tmp11        [V16    ] (  0,  0   )     int  ->  zero-ref    "field V12._length (fldOffset=0x4)" P-INDEP
-;  V17 tmp12        [V17,T10] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V18 tmp13        [V18,T11] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V19 tmp14        [V19,T12] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V20 tmp15        [V20,T13] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V21 cse0         [V21,T07] (  4,  4   )     int  ->   r6         "CSE - aggressive"
-;  V22 rat0         [V22,T08] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V23 rat1         [V23,T03] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
-;  V24 rat2         [V24,T09] (  3,  4   )     int  ->   r6         "runtime lookup"
-;  V25 rat3         [V25,T04] (  3,  5.60)     int  ->   r0         "spilling expr"
-;  V26 rat4         [V26,T06] (  3,  4.48)     int  ->   r6         "fgMakeTemp is creating a new local variable"
+;  V17 tmp12        [V17,T05] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V18 tmp13        [V18,T06] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V19 tmp14        [V19,T07] (  2,  4   )     int  ->   r1         "argument with side effect"
 ;
 ; Lcl frame size = 188
 
@@ -54,70 +47,49 @@ G_M19942_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mov     r5, r1
             ; gcrRegs +[r5]
                        ;; size=34 bbWeight=1 PerfScore 13.00
-G_M19942_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M19942_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG03:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M19942_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M19942_IG04:        ; bbWeight=0.20, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M19942_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=22 bbWeight=0.20 PerfScore 1.40
-G_M19942_IG05:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            mov     r6, r0
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             add     r0, sp, 4
             add     r2, sp, 148
+            mov     r1, r6
             movs    r3, 8
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // <PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon],System.__Canon](byref,int):System.Span`1[System.__Canon]
-                       ;; size=20 bbWeight=1 PerfScore 7.00
-G_M19942_IG06:        ; bbWeight=1, nogc, extend
+                     ;; size=64 bbWeight=1 PerfScore 21.00
+G_M19942_IG03:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x84]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x88]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG07:        ; bbWeight=1, nogc, extend
+G_M19942_IG04:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x8C]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x90]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG08:        ; bbWeight=1, isz, extend
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 12
-            ble     SHORT G_M19942_IG11
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG09:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r6, [r0+0x0C]
-            cmp     r6, 0
-            beq     SHORT G_M19942_IG11
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M19942_IG10:        ; bbWeight=0.64, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M19942_IG12
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M19942_IG11:        ; bbWeight=0.36, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M19942_IG05:        ; bbWeight=1, extend
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r6, r0
-                       ;; size=22 bbWeight=0.36 PerfScore 2.52
-G_M19942_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
-            mov     r1, r6
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             mov     r2, r5
             ; gcrRegs +[r2]
@@ -126,31 +98,43 @@ G_M19942_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r2 r5]
-            mov     r1, r6
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:ToArray():System.__Canon[]:this
             ; gcrRegs +[r0]
-            mov     r4, r0
-            ; gcrRegs +[r4]
-            mov     r1, r6
-            add     r0, sp, 12
+            mov     r5, r0
+            ; gcrRegs +[r5]
+            mov     r0, r4
             ; gcrRegs -[r0]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
+            add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:Dispose():this
-            mov     r0, r4
+            mov     r0, r5
             ; gcrRegs +[r0]
-                       ;; size=54 bbWeight=1 PerfScore 21.00
-G_M19942_IG13:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=114 bbWeight=1 PerfScore 39.00
+G_M19942_IG06:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 188
             pop     {r4,r5,r6,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
 
-; Total bytes of code 200, prolog size 30, PerfScore 66.76, instruction count 78, allocated bytes for code 200 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
+; Total bytes of code 234, prolog size 30, PerfScore 83.00, instruction count 83, allocated bytes for code 234 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -162,7 +146,7 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 100 (0x00064) Actual length = 200 (0x0000c8)
+  Function Length   : 117 (0x00075) Actual length = 234 (0x0000ea)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----

coreclr_tests.run.linux.arm.checked.mch

-32 (-10.60%) : 86.dasm - System.Linq.Enumerable:TryGetFirstSystem.__Canon:System.__Canon (FullOpts) 

@@ -7,25 +7,20 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T05] (  7,  4.88)     int  ->   r6         single-def
-;  V01 arg0         [V01,T06] (  4,  4   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T04] (  5, 12   )     int  ->   r6         single-def
+;  V01 arg0         [V01,T05] (  4,  4   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 arg1         [V02,T01] (  5, 19   )     ref  ->   r5         class-hnd single-def <System.Func`2[System.__Canon,ubyte]>
-;  V03 arg2         [V03,T07] (  4,  4   )   byref  ->   r7         single-def
+;  V03 arg2         [V03,T06] (  4,  4   )   byref  ->   r7         single-def
 ;  V04 loc0         [V04,T02] (  7, 20   )     ref  ->  [sp+0x08]  class-hnd EH-live spill-single-def <<unknown class>>
-;  V05 loc1         [V05,T03] (  3, 17   )     ref  ->   r6         class-hnd <System.__Canon>
-;  V06 loc2         [V06,T13] (  2,  2   )     ref  ->  [sp+0x04]  do-not-enreg[Z] must-init class-hnd EH-live <System.__Canon>
+;  V05 loc1         [V05,T03] (  3, 17   )     ref  ->   r8         class-hnd <System.__Canon>
+;  V06 loc2         [V06,T08] (  2,  2   )     ref  ->  [sp+0x04]  do-not-enreg[Z] must-init class-hnd EH-live <System.__Canon>
 ;* V07 loc3         [V07    ] (  0,  0   )     ref  ->  zero-ref    ld-addr-op class-hnd <System.__Canon>
 ;# V08 OutArgs      [V08    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V09 tmp1         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V10 tmp2         [V10,T08] (  4,  6   )     int  ->   r3         "VirtualCall with runtime lookup"
+;  V10 tmp2         [V10,T07] (  3,  6   )     int  ->   r3         "VirtualCall with runtime lookup"
 ;* V11 tmp3         [V11    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V12 tmp4         [V12,T00] (  3, 48   )     int  ->   r4         "VirtualCall with runtime lookup"
-;  V13 PSPSym       [V13,T14] (  1,  1   )     int  ->  [sp+0x10]  do-not-enreg[V] "PSPSym"
-;  V14 cse0         [V14,T04] (  2,  8.50)     int  ->   r8         hoist "CSE - aggressive"
-;  V15 rat0         [V15,T09] (  3,  5.60)     int  ->   r0         "fgMakeTemp is creating a new local variable"
-;  V16 rat1         [V16,T12] (  3,  2   )     int  ->   r8         "runtime lookup"
-;  V17 rat2         [V17,T10] (  3,  2.80)     int  ->   r0         "spilling expr"
-;  V18 rat3         [V18,T11] (  3,  2.24)     int  ->   r8         "fgMakeTemp is creating a new local variable"
+;  V13 PSPSym       [V13,T09] (  1,  1   )     int  ->  [sp+0x10]  do-not-enreg[V] "PSPSym"
 ;
 ; Lcl frame size = 20
 
@@ -46,32 +41,20 @@ G_M62024_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mov     r7, r3
             ; byrRegs +[r7]
                        ;; size=30 bbWeight=1 PerfScore 12.00
-G_M62024_IG02:        ; bbWeight=1, gcVars=00002000 {V06}, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7}, gcvars, byref, isz
-            ; GC ptr vars +{V06 V13}
+G_M62024_IG02:        ; bbWeight=1, gcVars=00000100 {V06}, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7}, gcvars, byref, isz
+            ; GC ptr vars +{V06}
             cmp     r4, 0
-            beq     SHORT G_M62024_IG21
+            beq     SHORT G_M62024_IG14
             cmp     r5, 0
-            beq     SHORT G_M62024_IG22
-            ldr     r0, [r6+0x20]
-            ldr     r0, [r0+0x08]
-            cmp     r0, 0
-            beq     SHORT G_M62024_IG04
-                       ;; size=16 bbWeight=1 PerfScore 8.00
-G_M62024_IG03:        ; bbWeight=0.80, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7}, byref, isz
-            mov     r3, r0
-            b       SHORT G_M62024_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M62024_IG04:        ; bbWeight=0.20, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7}, byref
+            beq     SHORT G_M62024_IG15
             mov     r0, r6
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
             mov     r3, r0
-                       ;; size=22 bbWeight=0.20 PerfScore 1.40
-G_M62024_IG05:        ; bbWeight=1, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7}, byref
             mov     r0, r4
             ; gcrRegs +[r0]
             mov     r4, r3
@@ -83,10 +66,9 @@ G_M62024_IG05:        ; bbWeight=1, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7},
             ; gcrRegs +[r4]
             str     r4, [sp+0x08]
             ; GC ptr vars +{V04}
-                     ;; size=12 bbWeight=1 PerfScore 6.00
-G_M62024_IG06:        ; bbWeight=1, gcVars=00002004 {V04 V06}, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7}, gcvars, byref, isz
+                       ;; size=42 bbWeight=1 PerfScore 17.00
+G_M62024_IG03:        ; bbWeight=1, gcVars=00000104 {V04 V06}, gcrefRegs=0030 {r4 r5}, byrefRegs=0080 {r7}, gcvars, byref, isz
             ; gcrRegs -[r0]
-            ; GC ptr vars -{V13}
             mov     r0, r4
             ; gcrRegs +[r0]
             movw    r4, 0xd1ff
@@ -97,42 +79,25 @@ G_M62024_IG06:        ; bbWeight=1, gcVars=00002004 {V04 V06}, gcrefRegs=0030 {r
             ; gcrRegs -[r0]
             ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M62024_IG14
+            beq     SHORT G_M62024_IG07
                         ;; size=18 bbWeight=1 PerfScore 7.00
-G_M62024_IG07:        ; bbWeight=0.50, gcrefRegs=0020 {r5}, byrefRegs=0080 {r7}, byref, isz
-            ldr     r0, [r6+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 12
-            ble     SHORT G_M62024_IG10
-                       ;; size=8 bbWeight=0.50 PerfScore 2.00
-G_M62024_IG08:        ; bbWeight=0.40, gcrefRegs=0020 {r5}, byrefRegs=0080 {r7}, byref, isz
-            ldr     r8, [r0+0x0C]
-            cmp     r8, 0
-            beq     SHORT G_M62024_IG10
-                       ;; size=10 bbWeight=0.40 PerfScore 1.20
-G_M62024_IG09:        ; bbWeight=0.32, gcrefRegs=0020 {r5}, byrefRegs=0080 {r7}, byref, isz
-            b       SHORT G_M62024_IG11
-                       ;; size=2 bbWeight=0.32 PerfScore 0.32
-G_M62024_IG10:        ; bbWeight=0.18, gcrefRegs=0020 {r5}, byrefRegs=0080 {r7}, byref
+G_M62024_IG04:        ; bbWeight=8, gcrefRegs=0020 {r5}, byrefRegs=0080 {r7}, byref, isz
             mov     r0, r6
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-            mov     r8, r0
-                       ;; size=22 bbWeight=0.18 PerfScore 1.26
-G_M62024_IG11:        ; bbWeight=8, gcrefRegs=0020 {r5}, byrefRegs=0080 {r7}, byref, isz
-            mov     r4, r8
+            mov     r4, r0
             ldr     r0, [sp+0x08]    // [V04 loc0]
             ; gcrRegs +[r0]
             ldr     r3, [r4]
             blx     r3
             ; gcr arg pop 0
-            mov     r6, r0
-            ; gcrRegs +[r6]
-            mov     r1, r6
+            mov     r8, r0
+            ; gcrRegs +[r8]
+            mov     r1, r8
             ; gcrRegs +[r1]
             ldr     r0, [r5+0x04]
             ldr     r3, [r5+0x0C]
@@ -140,31 +105,31 @@ G_M62024_IG11:        ; bbWeight=8, gcrefRegs=0020 {r5}, byrefRegs=0080 {r7}, by
             ; gcrRegs -[r0-r1]
             ; gcr arg pop 0
             cmp     r0, 0
-            bne     SHORT G_M62024_IG13
+            bne     SHORT G_M62024_IG06
             ldr     r0, [sp+0x08]   // [V04 loc0]
             ; gcrRegs +[r0]
             movw    r4, 0xd1ff
             movt    r4, 0xd1ff
             ldr     r3, [r4]
             blx     r3     // <unknown method>
-            ; gcrRegs -[r0 r6]
+            ; gcrRegs -[r0 r8]
             ; gcr arg pop 0
             cmp     r0, 0
-            bne     SHORT G_M62024_IG11
-                       ;; size=40 bbWeight=8 PerfScore 144.00
-G_M62024_IG12:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0080 {r7}, byref, isz
+            bne     SHORT G_M62024_IG04
+                       ;; size=60 bbWeight=8 PerfScore 192.00
+G_M62024_IG05:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0080 {r7}, byref, isz
             ; gcrRegs -[r5]
-            b       SHORT G_M62024_IG14
+            b       SHORT G_M62024_IG07
                         ;; size=2 bbWeight=1 PerfScore 1.00
-G_M62024_IG13:        ; bbWeight=1, gcrefRegs=0040 {r6}, byrefRegs=0080 {r7}, byref, isz
-            ; gcrRegs +[r6]
+G_M62024_IG06:        ; bbWeight=1, gcrefRegs=0100 {r8}, byrefRegs=0080 {r7}, byref, isz
+            ; gcrRegs +[r8]
             movs    r0, 1
             strb    r0, [r7]
-            str     r6, [sp+0x04]    // [V06 loc2]
-            b       SHORT G_M62024_IG15
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M62024_IG14:        ; bbWeight=1, gcVars=00000004 {V04}, gcrefRegs=0000 {}, byrefRegs=0080 {r7}, gcvars, byref, isz
-            ; gcrRegs -[r6]
+            str     r8, [sp+0x04] // [V06 loc2]
+            b       SHORT G_M62024_IG08
+                       ;; size=10 bbWeight=1 PerfScore 4.00
+G_M62024_IG07:        ; bbWeight=1, gcVars=00000004 {V04}, gcrefRegs=0000 {}, byrefRegs=0080 {r7}, gcvars, byref, isz
+            ; gcrRegs -[r8]
             ; GC ptr vars -{V06}
             ldr     r0, [sp+0x08]  // [V04 loc0]
             ; gcrRegs +[r0]
@@ -175,38 +140,38 @@ G_M62024_IG14:        ; bbWeight=1, gcVars=00000004 {V04}, gcrefRegs=0000 {}, by
             blx     r3     // <unknown method>
             ; gcrRegs -[r0]
             ; gcr arg pop 0
-            b       SHORT G_M62024_IG19
+            b       SHORT G_M62024_IG12
                       ;; size=16 bbWeight=1 PerfScore 6.00
-G_M62024_IG15:        ; bbWeight=1, gcVars=00002004 {V04 V06}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M62024_IG08:        ; bbWeight=1, gcVars=00000104 {V04 V06}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             ; byrRegs -[r7]
-            ; GC ptr vars +{V02 V04 V06 V13}
-            bl      G_M62024_IG23
+            ; GC ptr vars +{V02 V04 V06}
+            bl      G_M62024_IG16
                       ;; size=4 bbWeight=1 PerfScore 1.00
-G_M62024_IG16:        ; bbWeight=1, nogc, extend
+G_M62024_IG09:        ; bbWeight=1, nogc, extend
             nop     
                        ;; size=2 bbWeight=1 PerfScore 1.00
-G_M62024_IG17:        ; bbWeight=1, gcVars=00002000 {V06}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
-            ; GC ptr vars -{V02 V04 V13}
+G_M62024_IG10:        ; bbWeight=1, gcVars=00000100 {V06}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+            ; GC ptr vars -{V02 V04}
             ldr     r0, [sp+0x04]  // [V06 loc2]
             ; gcrRegs +[r0]
                        ;; size=2 bbWeight=1 PerfScore 1.00
-G_M62024_IG18:        ; bbWeight=1, epilog, nogc, extend
+G_M62024_IG11:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 20
             pop     {r4,r5,r6,r7,r8,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
-G_M62024_IG19:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0080 {r7}, gcvars, byref
+G_M62024_IG12:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0080 {r7}, gcvars, byref
             ; gcrRegs -[r0]
             ; byrRegs +[r7]
             ; GC ptr vars -{V06}
             movs    r0, 0
             strb    r0, [r7]
                        ;; size=4 bbWeight=1 PerfScore 2.00
-G_M62024_IG20:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+G_M62024_IG13:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
             ; byrRegs -[r7]
             add     sp, 20
             pop     {r4,r5,r6,r7,r8,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
-G_M62024_IG21:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M62024_IG14:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 17
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -215,7 +180,7 @@ G_M62024_IG21:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             ; gcr arg pop 0
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M62024_IG22:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M62024_IG15:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -224,33 +189,33 @@ G_M62024_IG22:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             ; gcr arg pop 0
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M62024_IG23:        ; bbWeight=1, gcVars=00002004 {V04 V06}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, funclet prolog, nogc
-            ; GC ptr vars +{V02 V04 V06 V13}
+G_M62024_IG16:        ; bbWeight=1, gcVars=00000104 {V04 V06}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, funclet prolog, nogc
+            ; GC ptr vars +{V02 V04 V06}
             push    {r3,r4,r5,r6,r7,r8,r11,lr}
             add     r3, r11, 8
             str     r3, [sp]
                        ;; size=10 bbWeight=1 PerfScore 3.00
...

+0 (0.00%) : 1.dasm - __GeneratedMainWrapper:Main():int (FullOpts) 

@@ -45,7 +45,7 @@ G_M2004_IG02:        ; bbWeight=1.01, gcrefRegs=0000 {}, byrefRegs=0000 {}, byre
             mov     r0, r5
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; gcr arg pop 0
             mov     r6, r0
@@ -54,7 +54,7 @@ G_M2004_IG02:        ; bbWeight=1.01, gcrefRegs=0000 {}, byrefRegs=0000 {}, byre
             ; gcrRegs -[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; gcr arg pop 0
             mov     r7, r0
@@ -65,7 +65,7 @@ G_M2004_IG02:        ; bbWeight=1.01, gcrefRegs=0000 {}, byrefRegs=0000 {}, byre
             addw    r0, r5, 0x82c
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; gcr arg pop 0
             mov     r8, r0
@@ -86,7 +86,7 @@ G_M2004_IG02:        ; bbWeight=1.01, gcrefRegs=0000 {}, byrefRegs=0000 {}, byre
             addw    r0, r5, 0x8c4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; gcr arg pop 0
             mov     r5, r0

+0 (0.00%) : 9.dasm - System.Console:g_EnsureInitialized|260():System.IO.TextWriter (FullOpts)

No diffs found?

+0 (0.00%) : 816.dasm - DelegateTest.DelegateEquals:PosTest6():ubyte:this (FullOpts) 

@@ -156,7 +156,7 @@ G_M21267_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; gcr arg pop 0
             mov     r5, r0
@@ -180,7 +180,7 @@ G_M21267_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; gcr arg pop 0
             mov     r4, r0

+0 (0.00%) : 1048.dasm - Helper:.cctor() (FullOpts) 

@@ -65,7 +65,7 @@ G_M23136_IG04:        ; bbWeight=0.50, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, b
             movt    r0, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             mov     r1, r0
             ; gcrRegs +[r1]

+0 (0.00%) : 1884.dasm - a:main():int (FullOpts) 

@@ -49,14 +49,14 @@ G_M56322_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             str     r0, [sp+0x04]  // [V00 loc0]
             mov     r0, r4
             ; gcrRegs -[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             mov     r1, r0
             ; gcrRegs +[r1]
@@ -91,14 +91,14 @@ G_M56322_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             str     r0, [sp+0x04]  // [V00 loc0]
             mov     r0, r4
             ; gcrRegs -[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             add     r3, sp, 4  // [V00 loc0]
             movw    r5, 0xd1ff
@@ -112,7 +112,7 @@ G_M56322_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; byrRegs +[r5]
             mov     r1, r0
@@ -129,7 +129,7 @@ G_M56322_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             subs    r3, r6, r5
             subs    r3, r3, r5
@@ -141,7 +141,7 @@ G_M56322_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             subs    r3, r6, r5
             str     r0, [sp+0x04]  // [V00 loc0]
@@ -151,7 +151,7 @@ G_M56322_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             subs    r3, r6, r5
             str     r0, [sp+0x04]  // [V00 loc0]

libraries.pmi.linux.arm.checked.mch

-28 (-34.15%) : 11109.dasm - Microsoft.FSharp.Core.FuncConvert:ToFSharpFunc[System.Canon,System.Nullable1[int]](System.Converter2[System.Canon,System.Nullable1[int]]):Microsoft.FSharp.Core.FSharpFunc2[System.__Canon,System.Nullable`1[int]] (FullOpts) 

@@ -2,53 +2,38 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Converter`2[System.__Canon,System.Nullable`1[int]]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Converter`2[System.__Canon,System.Nullable`1[int]]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V03 tmp1         [V03,T01] (  3,  6   )     ref  ->   r2         class-hnd exact single-def "NewObj constructor temp" <<StartupCode$FSharp-Core>.$Prim-types+ToFSharpFunc@3791-1[System.__Canon,System.Nullable`1[int]]>
 ;* V04 tmp2         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 rat0         [V05,T04] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V06 rat1         [V06,T02] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M36080_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M36080_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r1, [r1+0x0C]
-            cmp     r1, 0
-            beq     SHORT G_M36080_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M36080_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M36080_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M36080_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M36080_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M36080_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
+            ; gcr arg pop 0
             mov     r2, r0
             ; gcrRegs +[r2]
             adds    r0, r2, 4
@@ -63,13 +48,12 @@ G_M36080_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byre
             ; byrRegs -[r0]
             mov     r0, r2
             ; gcrRegs +[r0]
-                      ;; size=30 bbWeight=1 PerfScore 11.00
-G_M36080_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+                       ;; size=46 bbWeight=1 PerfScore 15.00
+G_M36080_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 82, prolog size 14, PerfScore 24.00, instruction count 29, allocated bytes for code 82 (MethodHash=cede730f) for method Microsoft.FSharp.Core.FuncConvert:ToFSharpFunc[System.__Canon,System.Nullable`1[int]](System.Converter`2[System.__Canon,System.Nullable`1[int]]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
+; Total bytes of code 54, prolog size 4, PerfScore 19.00, instruction count 19, allocated bytes for code 54 (MethodHash=cede730f) for method Microsoft.FSharp.Core.FuncConvert:ToFSharpFunc[System.__Canon,System.Nullable`1[int]](System.Converter`2[System.__Canon,System.Nullable`1[int]]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -81,11 +65,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 41 (0x00029) Actual length = 82 (0x000052)
+  Function Length   : 27 (0x0001b) Actual length = 54 (0x000036)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-28 (-34.15%) : 11113.dasm - Microsoft.FSharp.Core.FuncConvert:FromFuncSystem.__Canon:Microsoft.FSharp.Core.FSharpFunc`2System.Canon,System.Canon 

@@ -2,53 +2,38 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Func`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Func`1[System.__Canon]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V03 tmp1         [V03,T01] (  3,  6   )     ref  ->   r2         class-hnd exact single-def "NewObj constructor temp" <<StartupCode$FSharp-Core>.$Prim-types+FromFunc@3799[System.__Canon]>
 ;* V04 tmp2         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 rat0         [V05,T04] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V06 rat1         [V06,T02] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M8134_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M8134_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r1, [r1+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M8134_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M8134_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M8134_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M8134_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                      ;; size=6 bbWeight=1 PerfScore 3.00
+G_M8134_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M8134_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
+            ; gcr arg pop 0
             mov     r2, r0
             ; gcrRegs +[r2]
             adds    r0, r2, 4
@@ -63,13 +48,12 @@ G_M8134_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             ; byrRegs -[r0]
             mov     r0, r2
             ; gcrRegs +[r0]
-                      ;; size=30 bbWeight=1 PerfScore 11.00
-G_M8134_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+                       ;; size=46 bbWeight=1 PerfScore 15.00
+G_M8134_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 82, prolog size 14, PerfScore 24.00, instruction count 29, allocated bytes for code 82 (MethodHash=ecb1e039) for method Microsoft.FSharp.Core.FuncConvert:FromFunc[System.__Canon](System.Func`1[System.__Canon]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
+; Total bytes of code 54, prolog size 4, PerfScore 19.00, instruction count 19, allocated bytes for code 54 (MethodHash=ecb1e039) for method Microsoft.FSharp.Core.FuncConvert:FromFunc[System.__Canon](System.Func`1[System.__Canon]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -81,11 +65,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 41 (0x00029) Actual length = 82 (0x000052)
+  Function Length   : 27 (0x0001b) Actual length = 54 (0x000036)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-28 (-34.15%) : 11118.dasm - Microsoft.FSharp.Core.FuncConvert:FromActionSystem.__Canon:Microsoft.FSharp.Core.FSharpFunc`2System.Canon,System.Canon 

@@ -2,53 +2,38 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Action`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Action`1[System.__Canon]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V03 tmp1         [V03,T01] (  3,  6   )     ref  ->   r2         class-hnd exact single-def "NewObj constructor temp" <<StartupCode$FSharp-Core>.$Prim-types+FromAction@3820-1[System.__Canon]>
 ;* V04 tmp2         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 rat0         [V05,T04] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V06 rat1         [V06,T02] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M50630_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M50630_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r1, [r1+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M50630_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M50630_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M50630_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M50630_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M50630_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M50630_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
+            ; gcr arg pop 0
             mov     r2, r0
             ; gcrRegs +[r2]
             adds    r0, r2, 4
@@ -63,13 +48,12 @@ G_M50630_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byre
             ; byrRegs -[r0]
             mov     r0, r2
             ; gcrRegs +[r0]
-                      ;; size=30 bbWeight=1 PerfScore 11.00
-G_M50630_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+                       ;; size=46 bbWeight=1 PerfScore 15.00
+G_M50630_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 82, prolog size 14, PerfScore 24.00, instruction count 29, allocated bytes for code 82 (MethodHash=c1733a39) for method Microsoft.FSharp.Core.FuncConvert:FromAction[System.__Canon](System.Action`1[System.__Canon]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
+; Total bytes of code 54, prolog size 4, PerfScore 19.00, instruction count 19, allocated bytes for code 54 (MethodHash=c1733a39) for method Microsoft.FSharp.Core.FuncConvert:FromAction[System.__Canon](System.Action`1[System.__Canon]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -81,11 +65,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 41 (0x00029) Actual length = 82 (0x000052)
+  Function Length   : 27 (0x0001b) Actual length = 54 (0x000036)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

+24 (+7.41%) : 8065.dasm - System.Runtime.InteropServices.Marshal:CopyToManagedSystem.__Canon (FullOpts) 

@@ -8,11 +8,11 @@
 ; 3 inlinees with PGO data; 2 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r4         single-def
+;  V00 TypeCtx      [V00,T00] (  6,  6   )     int  ->   r4         single-def
 ;  V01 arg0         [V01,T03] (  4,  4   )     int  ->   r7         single-def
 ;  V02 arg1         [V02,T02] (  4,  4   )     ref  ->   r6         class-hnd single-def <System.__Canon[]>
 ;  V03 arg2         [V03,T01] (  5,  4   )     int  ->   r5         single-def
-;  V04 arg3         [V04,T10] (  4,  3   )     int  ->   r8         single-def
+;  V04 arg3         [V04,T07] (  4,  3   )     int  ->   r8         single-def
 ;  V05 loc0         [V05    ] (  2,  2   )  struct ( 8) [sp+0x1C]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Span`1[System.__Canon]>
 ;  V06 OutArgs      [V06    ] (  1,  1   )  struct ( 4) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V07 tmp1         [V07    ] (  3,  6   )  struct ( 8) [sp+0x14]  do-not-enreg[XS] must-init addr-exposed ld-addr-op "NewObj constructor temp" <System.Span`1[System.__Canon]>
@@ -26,20 +26,17 @@
 ;  V15 tmp9         [V15    ] (  3,  6   )     int  ->  [sp+0x18]  do-not-enreg[X] addr-exposed "field V07._length (fldOffset=0x4)" P-DEP
 ;  V16 tmp10        [V16    ] (  3,  5   )   byref  ->  [sp+0x0C]  do-not-enreg[X] addr-exposed "field V09._reference (fldOffset=0x0)" P-DEP
 ;  V17 tmp11        [V17    ] (  3,  5   )     int  ->  [sp+0x10]  do-not-enreg[X] addr-exposed "field V09._length (fldOffset=0x4)" P-DEP
-;  V18 tmp12        [V18,T11] (  2,  0   )     ref  ->   r1         single-def "argument with side effect"
-;  V19 tmp13        [V19,T12] (  2,  0   )     ref  ->   r1         single-def "argument with side effect"
-;  V20 tmp14        [V20,T07] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V21 tmp15        [V21,T08] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V22 tmp16        [V22,T09] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V23 cse0         [V23,T05] (  4,  4   )     int  ->   r9         "CSE - aggressive"
-;  V24 rat0         [V24,T06] (  3,  4   )     int  ->   r9         "runtime lookup"
-;  V25 rat1         [V25,T04] (  3,  5.60)     int  ->   r9         "fgMakeTemp is creating a new local variable"
+;  V18 tmp12        [V18,T08] (  2,  0   )     ref  ->   r1         single-def "argument with side effect"
+;  V19 tmp13        [V19,T09] (  2,  0   )     ref  ->   r1         single-def "argument with side effect"
+;  V20 tmp14        [V20,T04] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V21 tmp15        [V21,T05] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V22 tmp16        [V22,T06] (  2,  4   )     int  ->   r1         "argument with side effect"
 ;
-; Lcl frame size = 40
+; Lcl frame size = 44
 
 G_M25615_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r8,r9,r11,lr}
-            sub     sp, 40
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 44
             add     r11, sp, 64
             sub     r6, r11, 52
             movs    r4, 0
@@ -66,21 +63,21 @@ G_M25615_IG02:        ; bbWeight=1, gcrefRegs=0040 {r6}, byrefRegs=0000 {}, byre
             blx     r3     // <unknown method>
             ; gcrRegs -[r0]
             cmp     r7, 0
-            beq     SHORT G_M25615_IG08
+            beq     SHORT G_M25615_IG06
             cmp     r5, 0
-            blt     SHORT G_M25615_IG09
+            blt     SHORT G_M25615_IG07
             cmp     r8, 0
-            blt     SHORT G_M25615_IG10
+            blt     SHORT G_M25615_IG08
             movs    r0, 0
             str     r0, [sp+0x14]
             str     r0, [sp+0x18]
-            ldr     r0, [r4+0x20]
-            ldr     r9, [r0+0x08]
-            cmp     r9, 0
-            beq     SHORT G_M25615_IG07
-                       ;; size=54 bbWeight=1 PerfScore 20.00
-G_M25615_IG03:        ; bbWeight=1, gcrefRegs=0040 {r6}, byrefRegs=0000 {}, byref
-            mov     r1, r9
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 20
             mov     r2, r7
             mov     r3, r8
@@ -88,18 +85,24 @@ G_M25615_IG03:        ; bbWeight=1, gcrefRegs=0040 {r6}, byrefRegs=0000 {}, byre
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // System.Span`1[System.__Canon]:.ctor(uint,int):this
-                     ;; size=22 bbWeight=1 PerfScore 8.00
-G_M25615_IG04:        ; bbWeight=1, nogc, extend
-            ldr     r1, [sp+0x14]
-            str     r1, [sp+0x1C]
-            ldr     r1, [sp+0x18]
-            str     r1, [sp+0x20]
+                        ;; size=84 bbWeight=1 PerfScore 30.00
+G_M25615_IG03:        ; bbWeight=1, nogc, extend
+            ldr     r0, [sp+0x14]
+            str     r0, [sp+0x1C]
+            ldr     r0, [sp+0x18]
+            str     r0, [sp+0x20]
                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M25615_IG05:        ; bbWeight=1, extend
-            movs    r1, 0
-            str     r1, [sp+0x0C]
-            str     r1, [sp+0x10]
-            mov     r1, r9
+G_M25615_IG04:        ; bbWeight=1, extend
+            movs    r0, 0
+            str     r0, [sp+0x0C]
+            str     r0, [sp+0x10]
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             str     r8, [sp]
             add     r0, sp, 12
             mov     r2, r6
@@ -110,7 +113,13 @@ G_M25615_IG05:        ; bbWeight=1, extend
             ldr     lr, [lr]
             blx     lr     // System.Span`1[System.__Canon]:.ctor(System.__Canon[],int,int):this
             ; gcrRegs -[r2 r6]
-            mov     r1, r9
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             ldr     r2, [sp+0x0C]
             ; byrRegs +[r2]
             ldr     r3, [sp+0x10]
@@ -120,30 +129,18 @@ G_M25615_IG05:        ; bbWeight=1, extend
             ldr     lr, [lr]
             blx     lr     // System.Span`1[System.__Canon]:CopyTo(System.Span`1[System.__Canon]):this
             ; byrRegs -[r2]
-                      ;; size=54 bbWeight=1 PerfScore 20.00
-G_M25615_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 40
-            pop     {r4,r5,r6,r7,r8,r9,r11,pc}
+                       ;; size=94 bbWeight=1 PerfScore 32.00
+G_M25615_IG05:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 44
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M25615_IG07:        ; bbWeight=0.20, gcVars=00000000 {}, gcrefRegs=0040 {r6}, byrefRegs=0000 {}, gcvars, byref, isz
-            ; gcrRegs +[r6]
-            mov     r0, r4
-            movw    r1, 0xd1ff
-            movt    r1, 0xd1ff
-            movw    r3, 0xd1ff
-            movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r9, r0
-            b       SHORT G_M25615_IG03
-                       ;; size=24 bbWeight=0.20 PerfScore 1.60
-G_M25615_IG08:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
-            ; gcrRegs -[r6]
+G_M25615_IG06:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movw    r0, 0xd1ff
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_STRCNS
+            blx     r3      // CORINFO_HELP_NEWARR_1_ALIGN8
             ; gcrRegs +[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -152,13 +149,13 @@ G_M25615_IG08:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             ; gcrRegs -[r0]
             bkpt    
                        ;; size=36 bbWeight=0 PerfScore 0.00
-G_M25615_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M25615_IG07:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r0, 0xd1ff
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_STRCNS
+            blx     r3      // CORINFO_HELP_NEWARR_1_ALIGN8
             ; gcrRegs +[r0]
             mov     r1, r0
             ; gcrRegs +[r1]
@@ -171,13 +168,13 @@ G_M25615_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             ; gcrRegs -[r1]
             bkpt    
                        ;; size=40 bbWeight=0 PerfScore 0.00
-G_M25615_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M25615_IG08:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r0, 0xd1ff
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_STRCNS
+            blx     r3      // CORINFO_HELP_NEWARR_1_ALIGN8
             ; gcrRegs +[r0]
             mov     r1, r0
             ; gcrRegs +[r1]
@@ -191,7 +188,7 @@ G_M25615_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             bkpt    
                        ;; size=40 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 324, prolog size 28, PerfScore 70.60, instruction count 114, allocated bytes for code 324 (MethodHash=6f309bf0) for method System.Runtime.InteropServices.Marshal:CopyToManaged[System.__Canon](int,System.__Canon[],int,int) (FullOpts)
+; Total bytes of code 348, prolog size 28, PerfScore 83.00, instruction count 120, allocated bytes for code 348 (MethodHash=6f309bf0) for method System.Runtime.InteropServices.Marshal:CopyToManaged[System.__Canon](int,System.__Canon[],int,int) (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -203,7 +200,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 162 (0x000a2) Actual length = 324 (0x000144)
+  Function Length   : 174 (0x000ae) Actual length = 348 (0x00015c)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -211,7 +208,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    0A          add sp, sp, #40                     ; opsize 16
-    AB F0       pop {r4,r5,r6,r7,r8,r9,r11,lr}      ; opsize 32
+    0B          add sp, sp, #44                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

+24 (+10.26%) : 8062.dasm - System.Runtime.InteropServices.Marshal:CopyToNativeSystem.__Canon (FullOpts) 

@@ -8,11 +8,11 @@
 ; 1 inlinees with PGO data; 0 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r4         single-def
+;  V00 TypeCtx      [V00,T00] (  6,  6   )     int  ->   r4         single-def
 ;  V01 arg0         [V01,T01] (  4,  4   )     ref  ->   r5         class-hnd single-def <System.__Canon[]>
-;  V02 arg1         [V02,T04] (  3,  3   )     int  ->   r7         single-def
+;  V02 arg1         [V02,T03] (  3,  3   )     int  ->   r7         single-def
 ;  V03 arg2         [V03,T02] (  4,  4   )     int  ->   r6         single-def
-;  V04 arg3         [V04,T10] (  2,  2   )     int  ->   r8         single-def
+;  V04 arg3         [V04,T07] (  2,  2   )     int  ->   r8         single-def
 ;  V05 loc0         [V05    ] (  2,  2   )  struct ( 8) [sp+0x1C]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Span`1[System.__Canon]>
 ;  V06 OutArgs      [V06    ] (  1,  1   )  struct ( 4) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V07 tmp1         [V07    ] (  3,  6   )  struct ( 8) [sp+0x14]  do-not-enreg[XS] must-init addr-exposed ld-addr-op "NewObj constructor temp" <System.Span`1[System.__Canon]>
@@ -26,18 +26,15 @@
 ;  V15 tmp9         [V15    ] (  3,  6   )     int  ->  [sp+0x18]  do-not-enreg[X] addr-exposed "field V07._length (fldOffset=0x4)" P-DEP
 ;  V16 tmp10        [V16    ] (  3,  5   )   byref  ->  [sp+0x0C]  do-not-enreg[X] addr-exposed "field V09._reference (fldOffset=0x0)" P-DEP
 ;  V17 tmp11        [V17    ] (  3,  5   )     int  ->  [sp+0x10]  do-not-enreg[X] addr-exposed "field V09._length (fldOffset=0x4)" P-DEP
-;  V18 tmp12        [V18,T07] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V19 tmp13        [V19,T08] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V20 tmp14        [V20,T09] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V21 cse0         [V21,T05] (  4,  4   )     int  ->   r9         "CSE - aggressive"
-;  V22 rat0         [V22,T06] (  3,  4   )     int  ->   r9         "runtime lookup"
-;  V23 rat1         [V23,T03] (  3,  5.60)     int  ->   r9         "fgMakeTemp is creating a new local variable"
+;  V18 tmp12        [V18,T04] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V19 tmp13        [V19,T05] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V20 tmp14        [V20,T06] (  2,  4   )     int  ->   r1         "argument with side effect"
 ;
-; Lcl frame size = 40
+; Lcl frame size = 44
 
 G_M14219_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r8,r9,r11,lr}
-            sub     sp, 40
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 44
             add     r11, sp, 64
             sub     r6, r11, 52
             movs    r4, 0
@@ -64,17 +61,17 @@ G_M14219_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byre
             blx     r3     // <unknown method>
             ; gcrRegs -[r0]
             cmp     r6, 0
-            beq     SHORT G_M14219_IG08
+            beq     SHORT G_M14219_IG06
             movs    r0, 0
             str     r0, [sp+0x14]
             str     r0, [sp+0x18]
-            ldr     r0, [r4+0x20]
-            ldr     r9, [r0+0x08]
-            cmp     r9, 0
-            beq     SHORT G_M14219_IG07
-                       ;; size=44 bbWeight=1 PerfScore 16.00
-G_M14219_IG03:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
-            mov     r1, r9
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             str     r8, [sp]
             add     r0, sp, 20
             mov     r2, r5
@@ -85,18 +82,24 @@ G_M14219_IG03:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byre
             ldr     lr, [lr]
             blx     lr     // System.Span`1[System.__Canon]:.ctor(System.__Canon[],int,int):this
             ; gcrRegs -[r2 r5]
-                       ;; size=26 bbWeight=1 PerfScore 9.00
-G_M14219_IG04:        ; bbWeight=1, nogc, extend
-            ldr     r1, [sp+0x14]
-            str     r1, [sp+0x1C]
-            ldr     r1, [sp+0x18]
-            str     r1, [sp+0x20]
+                        ;; size=78 bbWeight=1 PerfScore 27.00
+G_M14219_IG03:        ; bbWeight=1, nogc, extend
+            ldr     r0, [sp+0x14]
+            str     r0, [sp+0x1C]
+            ldr     r0, [sp+0x18]
+            str     r0, [sp+0x20]
                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M14219_IG05:        ; bbWeight=1, extend
-            movs    r1, 0
-            str     r1, [sp+0x0C]
-            str     r1, [sp+0x10]
-            mov     r1, r9
+G_M14219_IG04:        ; bbWeight=1, extend
+            movs    r0, 0
+            str     r0, [sp+0x0C]
+            str     r0, [sp+0x10]
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             mov     r2, r6
             mov     r3, r8
@@ -104,7 +107,13 @@ G_M14219_IG05:        ; bbWeight=1, extend
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // System.Span`1[System.__Canon]:.ctor(uint,int):this
-            mov     r1, r9
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             ldr     r2, [sp+0x0C]
             ; byrRegs +[r2]
             ldr     r3, [sp+0x10]
@@ -114,30 +123,18 @@ G_M14219_IG05:        ; bbWeight=1, extend
             ldr     lr, [lr]
             blx     lr     // System.Span`1[System.__Canon]:CopyTo(System.Span`1[System.__Canon]):this
             ; byrRegs -[r2]
-                      ;; size=50 bbWeight=1 PerfScore 19.00
-G_M14219_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 40
-            pop     {r4,r5,r6,r7,r8,r9,r11,pc}
+                       ;; size=90 bbWeight=1 PerfScore 31.00
+G_M14219_IG05:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 44
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M14219_IG07:        ; bbWeight=0.20, gcVars=00000000 {}, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, gcvars, byref, isz
-            ; gcrRegs +[r5]
-            mov     r0, r4
-            movw    r1, 0xd1ff
-            movt    r1, 0xd1ff
-            movw    r3, 0xd1ff
-            movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r9, r0
-            b       SHORT G_M14219_IG03
-                       ;; size=24 bbWeight=0.20 PerfScore 1.60
-G_M14219_IG08:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
-            ; gcrRegs -[r5]
+G_M14219_IG06:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movw    r0, 0xd1ff
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_STRCNS
+            blx     r3      // CORINFO_HELP_NEWARR_1_ALIGN8
             ; gcrRegs +[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -147,7 +144,7 @@ G_M14219_IG08:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             bkpt    
                        ;; size=36 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 234, prolog size 28, PerfScore 66.60, instruction count 84, allocated bytes for code 234 (MethodHash=f9ccc874) for method System.Runtime.InteropServices.Marshal:CopyToNative[System.__Canon](System.__Canon[],int,int,int) (FullOpts)
+; Total bytes of code 258, prolog size 28, PerfScore 79.00, instruction count 90, allocated bytes for code 258 (MethodHash=f9ccc874) for method System.Runtime.InteropServices.Marshal:CopyToNative[System.__Canon](System.__Canon[],int,int,int) (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -159,7 +156,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 117 (0x00075) Actual length = 234 (0x0000ea)
+  Function Length   : 129 (0x00081) Actual length = 258 (0x000102)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -167,7 +164,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    0A          add sp, sp, #40                     ; opsize 16
-    AB F0       pop {r4,r5,r6,r7,r8,r9,r11,lr}      ; opsize 32
+    0B          add sp, sp, #44                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

+14 (+10.29%) : 4139.dasm - System.Numerics.Vector:AndNotSystem.__Canon:System.Numerics.Vector`1System.__Canon 

@@ -7,58 +7,52 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 RetBuf       [V00,T04] (  3,  3   )   byref  ->   r4         single-def
-;  V01 TypeCtx      [V01,T01] (  5,  4.20)     int  ->   r1         single-def
-;  V02 arg0         [V02,T00] (  6,  6   )  struct (16) [sp+0x40]  do-not-enreg[SA] multireg-arg single-def double-align <System.Numerics.Vector`1[System.__Canon]>
-;  V03 arg1         [V03,T05] (  4,  4   )  struct (16) [sp+0x50]  do-not-enreg[SA] multireg-arg single-def double-align <System.Numerics.Vector`1[System.__Canon]>
+;  V00 RetBuf       [V00,T02] (  3,  3   )   byref  ->   r5         single-def
+;  V01 TypeCtx      [V01,T01] (  5,  5   )     int  ->   r4         single-def
+;  V02 arg0         [V02,T00] (  6,  6   )  struct (16) [sp+0x48]  do-not-enreg[SA] multireg-arg single-def double-align <System.Numerics.Vector`1[System.__Canon]>
+;  V03 arg1         [V03,T03] (  4,  4   )  struct (16) [sp+0x58]  do-not-enreg[SA] multireg-arg single-def double-align <System.Numerics.Vector`1[System.__Canon]>
 ;  V04 OutArgs      [V04    ] (  1,  1   )  struct (24) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V05 loc1         [V05,T10] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V06 tmp2         [V06,T02] (  3,  6   )     int  ->   r5         "spilling helperCall"
+;  V05 loc1         [V05,T04] (  2,  4   )     int  ->   r6         "spilling helperCall"
+;  V06 tmp2         [V06,T05] (  2,  4   )     int  ->   r4         "spilling helperCall"
 ;  V07 tmp3         [V07    ] (  2,  4   )  struct (16) [sp+0x18]  do-not-enreg[HS] hidden-struct-arg double-align "spilled call-like call argument" <System.Numerics.Vector`1[System.__Canon]>
-;  V08 tmp4         [V08,T07] (  2,  4   )    long  ->  [sp+0x18]  do-not-enreg[H] hidden-struct-arg "field V07._00 (fldOffset=0x0)" P-DEP
-;  V09 tmp5         [V09,T08] (  2,  4   )    long  ->  [sp+0x20]  do-not-enreg[H] hidden-struct-arg "field V07._01 (fldOffset=0x8)" P-DEP
-;  V10 cse0         [V10,T09] (  2,  2   )     int  ->   r5         "CSE - aggressive"
-;  V11 rat0         [V11,T06] (  3,  4   )     int  ->   r5         "runtime lookup"
-;  V12 rat1         [V12,T03] (  3,  5.60)     int  ->   r5         "fgMakeTemp is creating a new local variable"
+;  V08 tmp4         [V08,T06] (  2,  4   )    long  ->  [sp+0x18]  do-not-enreg[H] hidden-struct-arg "field V07._00 (fldOffset=0x0)" P-DEP
+;  V09 tmp5         [V09,T07] (  2,  4   )    long  ->  [sp+0x20]  do-not-enreg[H] hidden-struct-arg "field V07._01 (fldOffset=0x8)" P-DEP
 ;
-; Lcl frame size = 48
+; Lcl frame size = 52
 
 G_M26296_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
             push    {r2,r3}
-            push    {r4,r5,r11,lr}
-            sub     sp, 48
-            add     r11, sp, 56
-            str     r1, [r11-0x0C]
-            mov     r4, r0
-            ; byrRegs +[r4]
-                       ;; size=18 bbWeight=1 PerfScore 6.00
-G_M26296_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref, isz
-            ldr     r0, [r1+0x20]
-            ldr     r5, [r0+0x08]
-            cmp     r5, 0
-            beq     SHORT G_M26296_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M26296_IG03:        ; bbWeight=0.80, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref, isz
-            b       SHORT G_M26296_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M26296_IG04:        ; bbWeight=0.20, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
-            mov     r0, r1
+            push    {r4,r5,r6,r11,lr}
+            sub     sp, 52
+            add     r11, sp, 64
+            str     r1, [r11-0x14]
+            mov     r5, r0
+            ; byrRegs +[r5]
+            mov     r4, r1
+                       ;; size=20 bbWeight=1 PerfScore 7.00
+G_M26296_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0020 {r5}, byref
+            mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r5, r0
-                       ;; size=22 bbWeight=0.20 PerfScore 1.40
-G_M26296_IG05:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
-            ldr     r2, [sp+0x50]
-            ldr     r3, [sp+0x54]
-            ldr     r0, [sp+0x58]
-            ldr     r1, [sp+0x5C]
+            blx     r3      // CORINFO_HELP_MEMCPY
+            mov     r6, r0
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r4, r0
+            ldr     r2, [sp+0x58]
+            ldr     r3, [sp+0x5C]
+            ldr     r0, [sp+0x60]
+            ldr     r1, [sp+0x64]
             str     r0, [sp]
             str     r1, [sp+0x04]
             add     r0, sp, 24
-            mov     r1, r5
+            mov     r1, r6
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
@@ -71,29 +65,29 @@ G_M26296_IG05:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byre
             str     r3, [sp+0x10]
             ldr     r3, [sp+0x24]
             str     r3, [sp+0x14]
-            ldr     r2, [sp+0x40]
-            ldr     r3, [sp+0x44]
-            ldr     r0, [sp+0x48]
-            ldr     r1, [sp+0x4C]
+            ldr     r2, [sp+0x48]
+            ldr     r3, [sp+0x4C]
+            ldr     r0, [sp+0x50]
+            ldr     r1, [sp+0x54]
             str     r0, [sp]
             str     r1, [sp+0x04]
-            mov     r0, r4
+            mov     r0, r5
             ; byrRegs +[r0]
-            mov     r1, r5
+            mov     r1, r4
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // System.Numerics.Vector`1[System.__Canon]:op_BitwiseAnd(System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon]
-            ; byrRegs -[r0 r4]
-                       ;; size=76 bbWeight=1 PerfScore 32.00
-G_M26296_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 48
-            pop     {r4,r5,r11,lr}
+            ; byrRegs -[r0 r5]
+                       ;; size=120 bbWeight=1 PerfScore 46.00
+G_M26296_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 52
+            pop     {r4,r5,r6,r11,lr}
             add     sp, 8
             bx      lr
                        ;; size=10 bbWeight=1 PerfScore 4.00
 
-; Total bytes of code 136, prolog size 16, PerfScore 48.20, instruction count 54, allocated bytes for code 136 (MethodHash=4cad9947) for method System.Numerics.Vector:AndNot[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
+; Total bytes of code 150, prolog size 16, PerfScore 57.00, instruction count 57, allocated bytes for code 150 (MethodHash=4cad9947) for method System.Numerics.Vector:AndNot[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -105,20 +99,20 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 68 (0x00044) Actual length = 136 (0x000088)
+  Function Length   : 75 (0x0004b) Actual length = 150 (0x000096)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
   Condition                  : 14 (0xe) (always)
   Epilog Start Index         : 6 (0x06)
   ---- Unwind codes ----
-    0C          add sp, sp, #48                     ; opsize 16
-    A8 30       pop {r4,r5,r11,lr}                  ; opsize 32
+    0D          add sp, sp, #52                     ; opsize 16
+    A8 70       pop {r4,r5,r6,r11,lr}               ; opsize 32
     EC 0C       pop {r2,r3}                         ; opsize 16
     FF          end
     ---- Epilog start at index 6 ----
-    0C          add sp, sp, #48                     ; opsize 16
-    A8 30       pop {r4,r5,r11,lr}                  ; opsize 32
+    0D          add sp, sp, #52                     ; opsize 16
+    A8 70       pop {r4,r5,r6,r11,lr}               ; opsize 32
     02          add sp, sp, #8                      ; opsize 16
     FD          end + nop                           ; opsize 16
     FF          end

libraries_tests.run.linux.arm.Release.mch

-26 (-38.24%) : 10612.dasm - System.Linq.Enumerable:FirstOrDefaultSystem.__Canon:System.__Canon (Tier1) 

@@ -2,48 +2,33 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; Tier1 code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 loc0         [V02    ] (  1,  1   )   ubyte  ->  [sp+0x00]  do-not-enreg[X] addr-exposed ld-addr-op
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M56297_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M56297_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M56297_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M56297_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M56297_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M56297_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M56297_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M56297_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             add     r2, sp, 0
             mov     r1, r4
             ; gcrRegs +[r1]
@@ -52,13 +37,13 @@ G_M56297_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r1 r4] +[r0]
-                     ;; size=16 bbWeight=1 PerfScore 6.00
-G_M56297_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+            ; gcr arg pop 0
+                       ;; size=34 bbWeight=1 PerfScore 11.00
+G_M56297_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 68, prolog size 14, PerfScore 19.60, instruction count 24, allocated bytes for code 68 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
+; Total bytes of code 42, prolog size 4, PerfScore 15.00, instruction count 15, allocated bytes for code 42 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -70,11 +55,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 34 (0x00022) Actual length = 68 (0x000044)
+  Function Length   : 21 (0x00015) Actual length = 42 (0x00002a)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-26 (-36.11%) : 7272.dasm - System.Runtime.CompilerServices.AsyncTaskMethodBuilder:StartSystem.__Canon:this (Instrumented Tier1) 

@@ -2,85 +2,71 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; Instrumented Tier1 code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; fully interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )   byref  ->  zero-ref    this single-def
-;  V01 TypeCtx      [V01,T00] (  5,  4.36)     int  ->   r1         single-def
-;  V02 arg1         [V02,T02] (  3,  3   )   byref  ->   r4         single-def
+;  V01 TypeCtx      [V01,T00] (  4,  4   )     int  ->   r1         single-def
+;  V02 arg1         [V02,T01] (  3,  3   )   byref  ->   r4         single-def
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T05] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T04] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r0         "spilling expr"
-;  V08 rat2         [V08,T03] (  3,  4.48)     int  ->   r0         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M8536_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r1, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r1, [sp+0x04]
             mov     r4, r2
             ; byrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M8536_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref, isz
-            ldr     r0, [r1+0x20]
-            ldr     r3, [r0+0x04]
-            cmp     r3, 12
-            ble     SHORT G_M8536_IG05
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M8536_IG03:        ; bbWeight=0.80, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref, isz
-            ldr     r0, [r0+0x0C]
-            cmp     r0, 0
-            beq     SHORT G_M8536_IG05
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M8536_IG04:        ; bbWeight=0.64, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref, isz
-            b       SHORT G_M8536_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M8536_IG05:        ; bbWeight=0.36, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
+                      ;; size=6 bbWeight=1 PerfScore 3.00
+G_M8536_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
             mov     r0, r1
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-                     ;; size=20 bbWeight=0.36 PerfScore 2.16
-G_M8536_IG06:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0010 {r4}, byref
             mov     r1, r4
             ; byrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-                     ;; size=12 bbWeight=1 PerfScore 4.00
-G_M8536_IG07:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,lr}
+                      ;; size=32 bbWeight=1 PerfScore 10.00
+G_M8536_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 8
+            pop     {r4,lr}
             bx      r3      // <unknown method>
             ; gcr arg pop 0
                        ;; size=8 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 72, prolog size 16, PerfScore 21.20, instruction count 26, allocated bytes for code 72 (MethodHash=bcebdea7) for method System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start[System.__Canon](byref):this (Instrumented Tier1)
+; Total bytes of code 46, prolog size 6, PerfScore 16.00, instruction count 16, allocated bytes for code 46 (MethodHash=bcebdea7) for method System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start[System.__Canon](byref):this (Instrumented Tier1)
 ; ============================================================
 
 Unwind Info:
   >> Start offset   : 0x000000 (not in unwind data)
   >>   End offset   : 0xd1ffab1e (not in unwind data)
-  Code Words        : 1
-  Epilog Count      : 0
+  Code Words        : 2
+  Epilog Count      : 1
   F bit             : 0
-  E bit             : 1
+  E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 36 (0x00024) Actual length = 72 (0x000048)
-  --- One epilog, unwind codes at 0
+  Function Length   : 23 (0x00017) Actual length = 46 (0x00002e)
+  ---- Epilog scopes ----
+  ---- Scope 0
+  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
+  Condition                  : 14 (0xe) (always)
+  Epilog Start Index         : 3 (0x03)
   ---- Unwind codes ----
-    ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
+    ---- Epilog start at index 3 ----
+    02          add sp, sp, #8                      ; opsize 16
+    A0 10       pop {r4,lr}                         ; opsize 32
+    FF          end
     FF          end

-30 (-34.09%) : 4606.dasm - System.Linq.Enumerable:IsEmptyArraySystem.__Canon:ubyte (Tier1) 

@@ -3,83 +3,67 @@
 ; Tier1 code
 ; optimized code
 ; optimized using Dynamic PGO
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; with Dynamic PGO: edge weights are valid, and fgCalledCount is 550
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V02 loc0         [V02,T05] (  3,  2.22)     ref  ->   r0         class-hnd single-def <<unknown class>>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V02 loc0         [V02,T03] (  3,  2.22)     ref  ->   r0         class-hnd single-def <<unknown class>>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38282_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
+                      ;; size=6 bbWeight=1 PerfScore 3.00
 G_M38282_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M38282_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38282_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M38282_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M38282_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M38282_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_ISINSTANCEOFARRAY
+            blx     r3       // CORINFO_HELP_ISINSTANCEOFINTERFACE
             ; gcrRegs -[r1 r4] +[r0]
+            ; gcr arg pop 0
             cmp     r0, 0
-            bne     SHORT G_M38282_IG08
-                       ;; size=16 bbWeight=1 PerfScore 6.00
-G_M38282_IG06:        ; bbWeight=0.78, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+            bne     SHORT G_M38282_IG05
+                       ;; size=34 bbWeight=1 PerfScore 11.00
+G_M38282_IG03:        ; bbWeight=0.78, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             ; gcrRegs -[r0]
             movs    r0, 0
                        ;; size=2 bbWeight=0.78 PerfScore 0.78
-G_M38282_IG07:        ; bbWeight=0.78, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.78 PerfScore 1.57
-G_M38282_IG08:        ; bbWeight=0.22, gcVars=00000000 {}, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, gcvars, byref, isz
+G_M38282_IG04:        ; bbWeight=0.78, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.78 PerfScore 0.78
+G_M38282_IG05:        ; bbWeight=0.22, gcVars=00000000 {}, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, gcvars, byref, isz
             ; gcrRegs +[r0]
             ldr     r0, [r0+0x04]
             ; gcrRegs -[r0]
             cmp     r0, 0
-            beq     SHORT G_M38282_IG09
+            beq     SHORT G_M38282_IG06
             movs    r0, 0
-            b       SHORT G_M38282_IG10
+            b       SHORT G_M38282_IG07
                      ;; size=10 bbWeight=0.22 PerfScore 1.08
-G_M38282_IG09:        ; bbWeight=0.22, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M38282_IG06:        ; bbWeight=0.22, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 1
                        ;; size=2 bbWeight=0.22 PerfScore 0.22
-G_M38282_IG10:        ; bbWeight=0.22, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.22 PerfScore 0.43
+G_M38282_IG07:        ; bbWeight=0.22, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.22 PerfScore 0.22
 
-; Total bytes of code 88, prolog size 14, PerfScore 21.68, instruction count 33, allocated bytes for code 88 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
+; Total bytes of code 58, prolog size 4, PerfScore 17.08, instruction count 23, allocated bytes for code 58 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -91,7 +75,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 44 (0x0002c) Actual length = 88 (0x000058)
+  Function Length   : 29 (0x0001d) Actual length = 58 (0x00003a)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -103,7 +87,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

+4 (+2.06%) : 828.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1) 

@@ -5,33 +5,34 @@
 ; optimized using Dynamic PGO
 ; r11 based frame
 ; fully interruptible
-; with Dynamic PGO: edge weights are invalid, and fgCalledCount is 2
+; with Dynamic PGO: edge weights are valid, and fgCalledCount is 2
 ; 2 inlinees with PGO data; 6 single block inlinees; 4 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T02] (  5,  4   )     ref  ->   r6         this class-hnd single-def <System.Collections.Hashtable>
+;  V00 this         [V00,T03] (  5,  4   )     ref  ->   r6         this class-hnd single-def <System.Collections.Hashtable>
 ;  V01 arg1         [V01,T00] ( 10,  7   )     ref  ->   r4         class-hnd single-def <System.Object>
-;  V02 arg2         [V02,T01] (  7,  5   )     ref  ->   r5         class-hnd single-def <System.Object>
+;  V02 arg2         [V02,T02] (  7,  5   )     ref  ->   r5         class-hnd single-def <System.Object>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V04 tmp1         [V04,T08] (  3,  2.25)     int  ->   r6         "guarded devirt return temp"
-;  V05 tmp2         [V05,T06] (  3,  3   )     ref  ->   r4         class-hnd exact single-def "guarded devirt this exact temp" <System.String>
+;  V04 tmp1         [V04,T09] (  3,  2   )     int  ->   r0         "guarded devirt return temp"
+;  V05 tmp2         [V05,T07] (  3,  3   )     ref  ->   r4         class-hnd exact single-def "guarded devirt this exact temp" <System.String>
 ;* V06 tmp3         [V06    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V07 tmp4         [V07    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;* V08 tmp5         [V08    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling QMark2" <System.String>
-;  V09 tmp6         [V09,T03] (  5,  4.50)     ref  ->   r5         class-hnd exact "Inline stloc first use temp" <System.String>
-;  V10 tmp7         [V10,T05] (  2,  4   )   byref  ->   r0         single-def "impAppendStmt"
+;  V08 tmp5         [V08,T04] (  4,  4   )     ref  ->   r5         class-hnd exact single-def "Inline stloc first use temp" <System.String>
+;  V09 tmp6         [V09,T06] (  2,  4   )   byref  ->   r0         single-def "impAppendStmt"
+;* V10 tmp7         [V10    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V11 tmp8         [V11    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V12 tmp9         [V12    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V13 tmp10        [V13    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V14 tmp11        [V14    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;* V15 tmp12        [V15    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;  V16 tmp13        [V16,T04] (  3,  4   )     int  ->   r5         "Single return block return value"
-;  V17 cse0         [V17,T07] (  3,  3   )     int  ->   r2         "CSE - aggressive"
-;  V18 cse1         [V18,T09] (  2,  2   )     ref  ->   r1         "CSE - aggressive"
+;  V15 tmp12        [V15,T05] (  3,  4   )     int  ->   r5         "Single return block return value"
+;  V16 cse0         [V16,T08] (  3,  3   )     int  ->   r2         "CSE - aggressive"
+;  V17 cse1         [V17,T10] (  2,  2   )     ref  ->   r1         "CSE - aggressive"
+;  V18 rat0         [V18,T01] (  5,  7.50)     ref  ->   r5         "replacement local"
+;  V19 rat1         [V19,T11] (  2,  2   )     int  ->   r2         "CSE for expectedClsNode"
 ;
 ; Lcl frame size = 4
 
-G_M51920_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
+G_M51920_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
             push    {r3,r4,r5,r6,r11,lr}
             add     r11, sp, 16
             mov     r6, r0
@@ -58,36 +59,43 @@ G_M51920_IG03:        ; bbWeight=1, gcrefRegs=0070 {r4 r5 r6}, byrefRegs=0000 {}
             ldr     r2, [r6+0x04]
             ; gcrRegs +[r2]
             cmp     r2, r4
-            beq     SHORT G_M51920_IG10
+            beq     SHORT G_M51920_IG16
             cmp     r4, r5
-            beq     SHORT G_M51920_IG12
+            beq     SHORT G_M51920_IG10
             ldr     r2, [r6+0x10]
             cmp     r2, 0
-            bne     SHORT G_M51920_IG14
+            bne     SHORT G_M51920_IG12
             cmp     r4, 0
-            beq     SHORT G_M51920_IG10
+            beq     SHORT G_M51920_IG16
             ldr     r2, [r4]
             ; gcrRegs -[r2]
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             cmp     r2, r1
-            bne     SHORT G_M51920_IG15
+            bne     SHORT G_M51920_IG14
             cmp     r5, 0
-            beq     SHORT G_M51920_IG09
+            beq     SHORT G_M51920_IG06
                         ;; size=38 bbWeight=1 PerfScore 17.00
 G_M51920_IG04:        ; bbWeight=0.50, gcrefRegs=0030 {r4 r5}, byrefRegs=0000 {}, byref, isz
             ; gcrRegs -[r6]
-            ldr     r2, [r5]
-            movw    r1, 0xd1ff
-            movt    r1, 0xd1ff
-            cmp     r2, r1
-            bne     SHORT G_M51920_IG09
+            movw    r2, 0xd1ff
+            movt    r2, 0xd1ff
+            ldr     r1, [r5]
+            cmp     r1, r2
+            beq     SHORT G_M51920_IG06
                         ;; size=14 bbWeight=0.50 PerfScore 2.50
-G_M51920_IG05:        ; bbWeight=1, gcrefRegs=0030 {r4 r5}, byrefRegs=0000 {}, byref, isz
+G_M51920_IG05:        ; bbWeight=0.25, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+            ; gcrRegs -[r5]
+            movs    r5, 0
+                       ;; size=2 bbWeight=0.25 PerfScore 0.25
+G_M51920_IG06:        ; bbWeight=1, gcrefRegs=0030 {r4 r5}, byrefRegs=0000 {}, byref, isz
+            ; gcrRegs +[r5]
+            cmp     r5, 0
+            beq     SHORT G_M51920_IG13
             ldr     r2, [r4+0x04]
             ldr     r1, [r5+0x04]
             cmp     r2, r1
-            bne     SHORT G_M51920_IG09
+            bne     SHORT G_M51920_IG13
             add     r0, r4, 8
             ; byrRegs +[r0]
             lsls    r2, r2, 1
@@ -100,34 +108,23 @@ G_M51920_IG05:        ; bbWeight=1, gcrefRegs=0030 {r4 r5}, byrefRegs=0000 {}, b
             ; gcrRegs -[r4-r5]
             ; byrRegs -[r0-r1]
             ; gcr arg pop 0
-            mov     r6, r0
-                       ;; size=32 bbWeight=1 PerfScore 12.00
-G_M51920_IG06:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
-            uxtb    r5, r6
-                       ;; size=2 bbWeight=1 PerfScore 1.00
+                       ;; size=34 bbWeight=1 PerfScore 13.00
 G_M51920_IG07:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+            uxtb    r5, r0
+                       ;; size=2 bbWeight=1 PerfScore 1.00
+G_M51920_IG08:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             uxtb    r0, r5
                        ;; size=2 bbWeight=1 PerfScore 1.00
-G_M51920_IG08:        ; bbWeight=1, epilog, nogc, extend
+G_M51920_IG09:        ; bbWeight=1, epilog, nogc, extend
             pop     {r3,r4,r5,r6,r11,pc}
                        ;; size=4 bbWeight=1 PerfScore 1.00
-G_M51920_IG09:        ; bbWeight=0.25, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, isz
-            movs    r6, 0
-            b       SHORT G_M51920_IG06
-                       ;; size=4 bbWeight=0.25 PerfScore 0.50
-G_M51920_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
-            movs    r0, 0
+G_M51920_IG10:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+            movs    r0, 1
                       ;; size=2 bbWeight=0 PerfScore 0.00
 G_M51920_IG11:        ; bbWeight=0, epilog, nogc, extend
             pop     {r3,r4,r5,r6,r11,pc}
                        ;; size=4 bbWeight=0 PerfScore 0.00
-G_M51920_IG12:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
-            movs    r0, 1
-                       ;; size=2 bbWeight=0 PerfScore 0.00
-G_M51920_IG13:        ; bbWeight=0, epilog, nogc, extend
-            pop     {r3,r4,r5,r6,r11,pc}
-                       ;; size=4 bbWeight=0 PerfScore 0.00
-G_M51920_IG14:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0070 {r4 r5 r6}, byrefRegs=0000 {}, gcvars, byref, isz
+G_M51920_IG12:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0070 {r4 r5 r6}, byrefRegs=0000 {}, gcvars, byref, isz
             ; gcrRegs +[r4-r6]
             ldr     r0, [r6+0x10]
             ; gcrRegs +[r0]
@@ -143,9 +140,13 @@ G_M51920_IG14:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0070 {r4 r5 r6
             ; gcrRegs -[r0-r2 r5-r6]
             ; gcr arg pop 0
             mov     r5, r0
-            b       SHORT G_M51920_IG07
+            b       SHORT G_M51920_IG08
                        ;; size=22 bbWeight=0 PerfScore 0.00
-G_M51920_IG15:        ; bbWeight=0, gcrefRegs=0030 {r4 r5}, byrefRegs=0000 {}, byref
+G_M51920_IG13:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, isz
+            movs    r0, 0
+            b       SHORT G_M51920_IG07
+                       ;; size=4 bbWeight=0 PerfScore 0.00
+G_M51920_IG14:        ; bbWeight=0, gcrefRegs=0030 {r4 r5}, byrefRegs=0000 {}, byref
             ; gcrRegs +[r4-r5]
             mov     r0, r4
             ; gcrRegs +[r0]
@@ -155,14 +156,21 @@ G_M51920_IG15:        ; bbWeight=0, gcrefRegs=0030 {r4 r5}, byrefRegs=0000 {}, b
             ldr     r3, [r3+0x2C]
             ldr     r3, [r3+0x08]
                        ;; size=10 bbWeight=0 PerfScore 0.00
-G_M51920_IG16:        ; bbWeight=0, epilog, nogc, extend
+G_M51920_IG15:        ; bbWeight=0, epilog, nogc, extend
             add     sp, 4
             pop     {r4,r5,r6,r11,lr}
             bx      r3     // <unknown method>
             ; gcr arg pop 0
                        ;; size=8 bbWeight=0 PerfScore 0.00
+G_M51920_IG16:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+            ; gcrRegs -[r0-r1 r4-r5]
+            movs    r0, 0
+                       ;; size=2 bbWeight=0 PerfScore 0.00
+G_M51920_IG17:        ; bbWeight=0, epilog, nogc, extend
+            pop     {r3,r4,r5,r6,r11,pc}
+                       ;; size=4 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 194, prolog size 14, PerfScore 50.00, instruction count 75, allocated bytes for code 194 (MethodHash=350c352f) for method System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
+; Total bytes of code 198, prolog size 14, PerfScore 50.75, instruction count 77, allocated bytes for code 198 (MethodHash=350c352f) for method System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -174,7 +182,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 97 (0x00061) Actual length = 194 (0x0000c2)
+  Function Length   : 99 (0x00063) Actual length = 198 (0x0000c6)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -187,11 +195,11 @@ Unwind Info:
   ---- Scope 2
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
   Condition                  : 14 (0xe) (always)
-  Epilog Start Index         : 0 (0x00)
+  Epilog Start Index         : 3 (0x03)
   ---- Scope 3
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
   Condition                  : 14 (0xe) (always)
-  Epilog Start Index         : 3 (0x03)
+  Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
     A8 78       pop {r3,r4,r5,r6,r11,lr}            ; opsize 32

+40 (+14.49%) : 6363.dasm - System.Threading.Tasks.Dataflow.Internal.Common:ReleaseAllPostponedMessagesSystem.__Canon (Tier0-FullOpts) 

@@ -8,72 +8,68 @@
 ; 0 inlinees with PGO data; 6 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T09] (  7, 13.88)     int  ->  [sp+0x38]  EH-live single-def
-;  V01 arg0         [V01,T11] (  4, 10   )     ref  ->  [sp+0x14]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon]>
-;  V02 arg1         [V02,T10] (  5, 12   )     ref  ->  [sp+0x10]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
-;  V03 arg2         [V03,T13] (  3,  2   )   byref  ->  [sp+0x0C]  EH-live single-def
+;  V00 TypeCtx      [V00,T00] (  9, 27   )     int  ->  [sp+0x30]  EH-live single-def
+;  V01 arg0         [V01,T07] (  4, 10   )     ref  ->  [sp+0x14]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon]>
+;  V02 arg1         [V02,T06] (  5, 12   )     ref  ->  [sp+0x10]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
+;  V03 arg2         [V03,T09] (  3,  2   )   byref  ->  [sp+0x0C]  EH-live single-def
 ;* V04 loc0         [V04    ] (  0,  0   )     int  ->  zero-ref   
-;  V05 loc1         [V05,T06] (  3, 17   )     int  ->  [sp+0x34]  do-not-enreg[Z] EH-live
-;  V06 loc2         [V06    ] (  8, 33   )  struct (16) [sp+0x20]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op double-align <System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
+;  V05 loc1         [V05,T03] (  3, 17   )     int  ->  [sp+0x2C]  do-not-enreg[Z] EH-live
+;  V06 loc2         [V06    ] (  8, 33   )  struct (16) [sp+0x18]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op double-align <System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
 ;* V07 loc3         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <<unknown class>>
 ;  V08 OutArgs      [V08    ] (  1,  1   )  struct ( 4) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V09 tmp1         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V10 tmp2         [V10    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V11 tmp3         [V11,T07] (  2, 16   )     ref  ->   r4         class-hnd "impAppendStmt" <System.__Canon>
+;  V11 tmp3         [V11,T04] (  2, 16   )     ref  ->   r8         class-hnd "impAppendStmt" <System.__Canon>
 ;* V12 tmp4         [V12    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V13 tmp5         [V13,T00] (  4, 24   )     int  ->  [sp+0x1C]  "VirtualCall with runtime lookup"
+;  V13 tmp5         [V13,T01] (  3, 24   )     int  ->   r1         "VirtualCall with runtime lookup"
 ;* V14 tmp6         [V14    ] (  0,  0   )  struct ( 8) zero-ref    double-align "spilled call-like call argument" <System.Threading.Tasks.Dataflow.DataflowMessageHeader>
 ;* V15 tmp7         [V15    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V16 tmp8         [V16    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V17 tmp9         [V17,T08] (  2, 16   )     ref  ->   r4         class-hnd "impAppendStmt" <System.__Canon>
+;  V17 tmp9         [V17,T05] (  2, 16   )     ref  ->   r4         class-hnd "impAppendStmt" <System.__Canon>
 ;* V18 tmp10        [V18    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V19 tmp11        [V19,T01] (  4, 24   )     int  ->  [sp+0x18]  "VirtualCall with runtime lookup"
+;  V19 tmp11        [V19,T02] (  3, 24   )     int  ->   r1         "VirtualCall with runtime lookup"
 ;* V20 tmp12        [V20    ] (  0,  0   )  struct ( 8) zero-ref    double-align "spilled call-like call argument" <System.Threading.Tasks.Dataflow.DataflowMessageHeader>
-;  V21 tmp13        [V21,T15] (  2,  0   )     ref  ->   r1         class-hnd "impSpillSpecialSideEff" <<unknown class>>
-;  V22 tmp14        [V22,T12] (  2,  4   )     ref  ->   r1         class-hnd single-def "Inlining Arg" <System.Collections.Generic.Dictionary`2[System.__Canon,int]>
+;  V21 tmp13        [V21,T11] (  2,  0   )     ref  ->   r1         class-hnd "impSpillSpecialSideEff" <<unknown class>>
+;  V22 tmp14        [V22,T08] (  2,  4   )     ref  ->   r1         class-hnd single-def "Inlining Arg" <System.Collections.Generic.Dictionary`2[System.__Canon,int]>
 ;* V23 tmp15        [V23    ] (  0,  0   )    long  ->  zero-ref    "field V14._id (fldOffset=0x0)" P-INDEP
 ;* V24 tmp16        [V24    ] (  0,  0   )    long  ->  zero-ref    "field V20._id (fldOffset=0x0)" P-INDEP
-;  V25 PSPSym       [V25,T14] (  1,  1   )     int  ->  [sp+0x40]  do-not-enreg[V] "PSPSym"
-;  V26 rat0         [V26,T02] (  3, 22.40)     int  ->   r0         "spilling expr"
-;  V27 rat1         [V27,T04] (  3, 17.92)     int  ->   r0         "fgMakeTemp is creating a new local variable"
-;  V28 rat2         [V28,T03] (  3, 22.40)     int  ->   r0         "spilling expr"
-;  V29 rat3         [V29,T05] (  3, 17.92)     int  ->   r0         "fgMakeTemp is creating a new local variable"
+;  V25 PSPSym       [V25,T10] (  1,  1   )     int  ->  [sp+0x38]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 68
+; Lcl frame size = 60
 
 G_M56511_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
             push    {r4,r5,r6,r7,r8,r11,lr}
-            sub     sp, 68
-            add     r11, sp, 88
+            sub     sp, 60
+            add     r11, sp, 80
             movs    r4, 0
-            str     r4, [sp+0x20]    // [V06 loc2]
-            add     r4, sp, 96
-            str     r4, [sp+0x40]  // [V25 PSPSym]
+            str     r4, [sp+0x18]  // [V06 loc2]
+            add     r4, sp, 88
+            str     r4, [sp+0x38]  // [V25 PSPSym]
             str     r0, [r11-0x1C]
-            str     r0, [sp+0x38]    // [V00 TypeCtx]
+            str     r0, [sp+0x30] // [V00 TypeCtx]
             str     r1, [sp+0x14]   // [V01 arg0]
             ; GC ptr vars +{V01}
             str     r2, [sp+0x10]  // [V02 arg1]
             ; GC ptr vars +{V02}
             str     r3, [sp+0x0C]  // [V03 arg2]
             ; GC ptr vars +{V03}
-            mov     r5, r0
-            mov     r7, r1
-            ; gcrRegs +[r7]
-            mov     r6, r2
+            mov     r4, r0
+            mov     r6, r1
             ; gcrRegs +[r6]
-            mov     r8, r3
-            ; byrRegs +[r8]
+            mov     r5, r2
+            ; gcrRegs +[r5]
+            mov     r7, r3
+            ; byrRegs +[r7]
                         ;; size=38 bbWeight=1 PerfScore 16.00
-G_M56511_IG02:        ; bbWeight=1, gcVars=00002C00 {V01 V02 V03}, gcrefRegs=00C0 {r6 r7}, byrefRegs=0100 {r8}, gcvars, byref, isz
-            ldr     r1, [r6+0x08]
+G_M56511_IG02:        ; bbWeight=1, gcVars=000002C0 {V01 V02 V03}, gcrefRegs=0060 {r5 r6}, byrefRegs=0080 {r7}, gcvars, byref, isz
+            ldr     r1, [r5+0x08]
             ; gcrRegs +[r1]
             ldrsb   r1, [r1]
             ; gcrRegs -[r1]
             movs    r1, 0
-            str     r1, [sp+0x34]   // [V05 loc1]
-            add     r1, sp, 32 // [V06 loc2]
-            mov     r0, r6
+            str     r1, [sp+0x2C]  // [V05 loc1]
+            add     r1, sp, 24 // [V06 loc2]
+            mov     r0, r5
             ; gcrRegs +[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -82,99 +78,90 @@ G_M56511_IG02:        ; bbWeight=1, gcVars=00002C00 {V01 V02 V03}, gcrefRegs=00C
             ; gcrRegs -[r0]
             ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M56511_IG13
+            beq     SHORT G_M56511_IG05
                         ;; size=30 bbWeight=1 PerfScore 12.00
-G_M56511_IG03:        ; bbWeight=4, gcrefRegs=00C0 {r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            ldr     r4, [sp+0x20]  // [V06 loc2]
-            ; gcrRegs +[r4]
-            ldr     r0, [r5+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 12
-            ble     SHORT G_M56511_IG06
-                       ;; size=10 bbWeight=4 PerfScore 20.00
-G_M56511_IG04:        ; bbWeight=3.20, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            ldr     r0, [r0+0x0C]
-            cmp     r0, 0
-            beq     SHORT G_M56511_IG06
-                       ;; size=6 bbWeight=3.20 PerfScore 9.60
-G_M56511_IG05:        ; bbWeight=2.56, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            mov     r3, r0
-            str     r3, [sp+0x1C]  // [V13 tmp5]
-            b       SHORT G_M56511_IG07
-                       ;; size=6 bbWeight=2.56 PerfScore 7.68
-G_M56511_IG06:        ; bbWeight=1.44, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref
-            mov     r0, r5
+G_M56511_IG03:        ; bbWeight=4, gcrefRegs=0060 {r5 r6}, byrefRegs=0080 {r7}, byref, isz
+            mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-            str     r0, [sp+0x1C]    // [V13 tmp5]
-                       ;; size=22 bbWeight=1.44 PerfScore 10.08
-G_M56511_IG07:        ; bbWeight=4, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            str     r7, [sp]   // [V08 OutArgs]
-            ; gcr arg write
-            ldr     r2, [sp+0x28]  // [V06 loc2+0x08]
-            ldr     r3, [sp+0x2C]  // [V06 loc2+0x0c]
             mov     r0, r4
-            ; gcrRegs +[r0]
-            ldr     r4, [sp+0x1C]  // [V13 tmp5]
-            ; gcrRegs -[r4]
-            ldr     r1, [r4]
-            blx     r1
-            ; gcrRegs -[r0]
-            ; gcr arg pop 0
-            cmp     r0, 0
-            beq     SHORT G_M56511_IG12
-            ldr     r4, [sp+0x20]  // [V06 loc2]
-            ; gcrRegs +[r4]
-            ldr     r0, [r5+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 16
-            ble     SHORT G_M56511_IG10
-                       ;; size=28 bbWeight=4 PerfScore 56.00
-G_M56511_IG08:        ; bbWeight=3.20, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            ldr     r0, [r0+0x10]
-            cmp     r0, 0
-            beq     SHORT G_M56511_IG10
-                       ;; size=6 bbWeight=3.20 PerfScore 9.60
-G_M56511_IG09:        ; bbWeight=2.56, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            mov     r3, r0
-            str     r3, [sp+0x18]  // [V19 tmp11]
-            b       SHORT G_M56511_IG11
-                       ;; size=6 bbWeight=2.56 PerfScore 7.68
-G_M56511_IG10:        ; bbWeight=1.44, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref
-            mov     r0, r5
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-            str     r0, [sp+0x18]    // [V19 tmp11]
-                       ;; size=22 bbWeight=1.44 PerfScore 10.08
-G_M56511_IG11:        ; bbWeight=4, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref
-            str     r7, [sp]   // [V08 OutArgs]
+            ldr     r8, [sp+0x18] // [V06 loc2]
+            ; gcrRegs +[r8]
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            mov     r1, r0
+            str     r6, [sp]   // [V08 OutArgs]
             ; gcr arg write
-            ldr     r2, [sp+0x28]  // [V06 loc2+0x08]
-            ldr     r3, [sp+0x2C]  // [V06 loc2+0x0c]
+            ldr     r2, [sp+0x20]   // [V06 loc2+0x08]
+            ldr     r3, [sp+0x24]  // [V06 loc2+0x0c]
+            mov     r0, r8
+            ; gcrRegs +[r0]
+            mov     r4, r1
+            ldr     r1, [r1]
+            blx     r1
+            ; gcrRegs -[r0 r8]
+            ; gcr arg pop 0
+            cmp     r0, 0
+            beq     SHORT G_M56511_IG04
+            ldr     r0, [sp+0x30]  // [V00 TypeCtx]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            ldr     r0, [sp+0x30]  // [V00 TypeCtx]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            ldr     r4, [sp+0x18]  // [V06 loc2]
+            ; gcrRegs +[r4]
+            ldr     r0, [sp+0x30]  // [V00 TypeCtx]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            mov     r1, r0
+            str     r6, [sp]   // [V08 OutArgs]
+            ; gcr arg write
+            ldr     r2, [sp+0x20]  // [V06 loc2+0x08]
+            ldr     r3, [sp+0x24]  // [V06 loc2+0x0c]
             mov     r0, r4
             ; gcrRegs +[r0]
-            ldr     r4, [sp+0x18] // [V19 tmp11]
+            mov     r4, r1
             ; gcrRegs -[r4]
-            ldr     r1, [r4]
+            ldr     r1, [r1]
             blx     r1
             ; gcrRegs -[r0]
             ; gcr arg pop 0
...

+34 (+17.00%) : 1964.dasm - System.Linq.Enumerable:gEnumerableToArray|296_0System.__Canon:System.Canon 

@@ -8,13 +8,13 @@
 ; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->   r4         single-def
-;  V01 arg0         [V01,T05] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  8,  8   )     int  ->   r4         single-def
+;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 loc0         [V02    ] (  1,  1   )  struct (32) [sp+0x94]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon]>
 ;  V03 loc1         [V03    ] (  5,  5   )  struct (136) [sp+0x0C]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]>
-;  V04 loc2         [V04,T14] (  2,  2   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
+;  V04 loc2         [V04,T08] (  2,  2   )     ref  ->   r5         class-hnd single-def <System.__Canon[]>
 ;# V05 OutArgs      [V05    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V06 tmp1         [V06    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V06 tmp1         [V06,T04] (  2,  4   )     int  ->   r6         "spilling helperCall"
 ;* V07 tmp2         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V08 tmp3         [V08    ] (  3,  6   )  struct ( 8) [sp+0x04]  do-not-enreg[HS] must-init hidden-struct-arg "spilled call-like call argument" <System.Span`1[System.__Canon]>
 ;* V09 tmp4         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
@@ -25,16 +25,9 @@
 ;  V14 tmp9         [V14,T02] (  3,  6   )     int  ->  [sp+0x08]  do-not-enreg[H] hidden-struct-arg "field V08._length (fldOffset=0x4)" P-DEP
 ;* V15 tmp10        [V15    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V12._reference (fldOffset=0x0)" P-INDEP
 ;* V16 tmp11        [V16    ] (  0,  0   )     int  ->  zero-ref    "field V12._length (fldOffset=0x4)" P-INDEP
-;  V17 tmp12        [V17,T10] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V18 tmp13        [V18,T11] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V19 tmp14        [V19,T12] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V20 tmp15        [V20,T13] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V21 cse0         [V21,T07] (  4,  4   )     int  ->   r6         "CSE - aggressive"
-;  V22 rat0         [V22,T08] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V23 rat1         [V23,T03] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
-;  V24 rat2         [V24,T09] (  3,  4   )     int  ->   r6         "runtime lookup"
-;  V25 rat3         [V25,T04] (  3,  5.60)     int  ->   r0         "spilling expr"
-;  V26 rat4         [V26,T06] (  3,  4.48)     int  ->   r6         "fgMakeTemp is creating a new local variable"
+;  V17 tmp12        [V17,T05] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V18 tmp13        [V18,T06] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V19 tmp14        [V19,T07] (  2,  4   )     int  ->   r1         "argument with side effect"
 ;
 ; Lcl frame size = 188
 
@@ -54,70 +47,49 @@ G_M19942_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mov     r5, r1
             ; gcrRegs +[r5]
                        ;; size=34 bbWeight=1 PerfScore 13.00
-G_M19942_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M19942_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG03:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M19942_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M19942_IG04:        ; bbWeight=0.20, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M19942_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=22 bbWeight=0.20 PerfScore 1.40
-G_M19942_IG05:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            mov     r6, r0
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             add     r0, sp, 4
             add     r2, sp, 148
+            mov     r1, r6
             movs    r3, 8
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // <PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon],System.__Canon](byref,int):System.Span`1[System.__Canon]
-                       ;; size=20 bbWeight=1 PerfScore 7.00
-G_M19942_IG06:        ; bbWeight=1, nogc, extend
+                     ;; size=64 bbWeight=1 PerfScore 21.00
+G_M19942_IG03:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x84]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x88]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG07:        ; bbWeight=1, nogc, extend
+G_M19942_IG04:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x8C]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x90]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG08:        ; bbWeight=1, isz, extend
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 12
-            ble     SHORT G_M19942_IG11
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG09:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r6, [r0+0x0C]
-            cmp     r6, 0
-            beq     SHORT G_M19942_IG11
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M19942_IG10:        ; bbWeight=0.64, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M19942_IG12
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M19942_IG11:        ; bbWeight=0.36, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M19942_IG05:        ; bbWeight=1, extend
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r6, r0
-                       ;; size=22 bbWeight=0.36 PerfScore 2.52
-G_M19942_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
-            mov     r1, r6
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             mov     r2, r5
             ; gcrRegs +[r2]
@@ -126,31 +98,43 @@ G_M19942_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r2 r5]
-            mov     r1, r6
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:ToArray():System.__Canon[]:this
             ; gcrRegs +[r0]
-            mov     r4, r0
-            ; gcrRegs +[r4]
-            mov     r1, r6
-            add     r0, sp, 12
+            mov     r5, r0
+            ; gcrRegs +[r5]
+            mov     r0, r4
             ; gcrRegs -[r0]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
+            add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:Dispose():this
-            mov     r0, r4
+            mov     r0, r5
             ; gcrRegs +[r0]
-                       ;; size=54 bbWeight=1 PerfScore 21.00
-G_M19942_IG13:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=114 bbWeight=1 PerfScore 39.00
+G_M19942_IG06:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 188
             pop     {r4,r5,r6,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
 
-; Total bytes of code 200, prolog size 30, PerfScore 66.76, instruction count 78, allocated bytes for code 200 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
+; Total bytes of code 234, prolog size 30, PerfScore 83.00, instruction count 83, allocated bytes for code 234 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
 ; ============================================================
 
 Unwind Info:
@@ -162,7 +146,7 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 100 (0x00064) Actual length = 200 (0x0000c8)
+  Function Length   : 117 (0x00075) Actual length = 234 (0x0000ea)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----

librariestestsnotieredcompilation.run.linux.arm.Release.mch

-26 (-38.24%) : 5332.dasm - System.Linq.Enumerable:SingleOrDefaultSystem.__Canon:System.__Canon (FullOpts) 

@@ -2,48 +2,33 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 loc0         [V02    ] (  1,  1   )   ubyte  ->  [sp+0x00]  do-not-enreg[X] addr-exposed ld-addr-op
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M27753_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M27753_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M27753_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M27753_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M27753_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M27753_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M27753_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M27753_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             add     r2, sp, 0
             mov     r1, r4
             ; gcrRegs +[r1]
@@ -52,13 +37,13 @@ G_M27753_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r1 r4] +[r0]
-                     ;; size=16 bbWeight=1 PerfScore 6.00
-G_M27753_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+            ; gcr arg pop 0
+                       ;; size=34 bbWeight=1 PerfScore 11.00
+G_M27753_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 68, prolog size 14, PerfScore 19.60, instruction count 24, allocated bytes for code 68 (MethodHash=f6189396) for method System.Linq.Enumerable:SingleOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (FullOpts)
+; Total bytes of code 42, prolog size 4, PerfScore 15.00, instruction count 15, allocated bytes for code 42 (MethodHash=f6189396) for method System.Linq.Enumerable:SingleOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -70,11 +55,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 34 (0x00022) Actual length = 68 (0x000044)
+  Function Length   : 21 (0x00015) Actual length = 42 (0x00002a)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-22 (-33.33%) : 4609.dasm - Microsoft.CodeAnalysis.ImmutableArrayExtensions:AsImmutableSystem.__Canon:System.Collections.Immutable.ImmutableArray`1System.__Canon 

@@ -2,78 +2,69 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; fully interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V03 tmp1         [V03    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V04 tmp2         [V04,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V05 rat0         [V05,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V06 rat1         [V06,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V04 tmp2         [V04,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M39678_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M39678_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M39678_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M39678_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M39678_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M39678_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M39678_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-                     ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M39678_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-                     ;; size=12 bbWeight=1 PerfScore 4.00
-G_M39678_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,lr}
+                      ;; size=30 bbWeight=1 PerfScore 9.00
+G_M39678_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 8
+            pop     {r4,lr}
             bx      r3      // System.Collections.Immutable.ImmutableArray:CreateRange[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Immutable.ImmutableArray`1[System.__Canon]
             ; gcr arg pop 0
                        ;; size=8 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 66, prolog size 16, PerfScore 18.60, instruction count 23, allocated bytes for code 66 (MethodHash=727d6501) for method Microsoft.CodeAnalysis.ImmutableArrayExtensions:AsImmutable[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Immutable.ImmutableArray`1[System.__Canon] (FullOpts)
+; Total bytes of code 44, prolog size 6, PerfScore 15.00, instruction count 15, allocated bytes for code 44 (MethodHash=727d6501) for method Microsoft.CodeAnalysis.ImmutableArrayExtensions:AsImmutable[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Immutable.ImmutableArray`1[System.__Canon] (FullOpts)
 ; ============================================================
 
 Unwind Info:
   >> Start offset   : 0x000000 (not in unwind data)
   >>   End offset   : 0xd1ffab1e (not in unwind data)
-  Code Words        : 1
-  Epilog Count      : 0
+  Code Words        : 2
+  Epilog Count      : 1
   F bit             : 0
-  E bit             : 1
+  E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 33 (0x00021) Actual length = 66 (0x000042)
-  --- One epilog, unwind codes at 0
+  Function Length   : 22 (0x00016) Actual length = 44 (0x00002c)
+  ---- Epilog scopes ----
+  ---- Scope 0
+  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
+  Condition                  : 14 (0xe) (always)
+  Epilog Start Index         : 3 (0x03)
   ---- Unwind codes ----
-    ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
+    ---- Epilog start at index 3 ----
+    02          add sp, sp, #8                      ; opsize 16
+    A0 10       pop {r4,lr}                         ; opsize 32
+    FF          end
     FF          end

-30 (-33.33%) : 10.dasm - System.Linq.Enumerable:IsEmptyArraySystem.__Canon:ubyte (FullOpts) 

@@ -2,82 +2,66 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V02 loc0         [V02,T05] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V02 loc0         [V02,T03] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38282_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
+                      ;; size=6 bbWeight=1 PerfScore 3.00
 G_M38282_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M38282_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38282_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M38282_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M38282_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M38282_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-            blx     r3       // CORINFO_HELP_ISINSTANCEOFARRAY
+            blx     r3       // CORINFO_HELP_ISINSTANCEOFINTERFACE
             ; gcrRegs -[r1 r4] +[r0]
+            ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M38282_IG09
-                       ;; size=18 bbWeight=1 PerfScore 7.00
-G_M38282_IG06:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
+            beq     SHORT G_M38282_IG06
+                       ;; size=36 bbWeight=1 PerfScore 12.00
+G_M38282_IG03:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
             ldr     r0, [r0+0x04]
             ; gcrRegs -[r0]
             cmp     r0, 0
-            beq     SHORT G_M38282_IG07
+            beq     SHORT G_M38282_IG04
             movs    r0, 0
-            b       SHORT G_M38282_IG08
+            b       SHORT G_M38282_IG05
                      ;; size=10 bbWeight=0.50 PerfScore 2.50
-G_M38282_IG07:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M38282_IG04:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 1
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG08:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
-G_M38282_IG09:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M38282_IG05:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
+G_M38282_IG06:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 0
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG10:        ; bbWeight=0.50, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
+G_M38282_IG07:        ; bbWeight=0.50, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
 
-; Total bytes of code 90, prolog size 14, PerfScore 24.10, instruction count 34, allocated bytes for code 90 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
+; Total bytes of code 60, prolog size 4, PerfScore 19.50, instruction count 24, allocated bytes for code 60 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -89,7 +73,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 45 (0x0002d) Actual length = 90 (0x00005a)
+  Function Length   : 30 (0x0001e) Actual length = 60 (0x00003c)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -101,7 +85,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

+8 (+3.92%) : 2315.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.ValueTuple2[int,System.__Canon]](System.Collections.Generic.List1System.ValueTuple2[int,System.__Canon]]):System.Span1[System.ValueTuple`2[int,System.__Canon] 

@@ -8,27 +8,26 @@
 ; 0 inlinees with PGO data; 4 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 RetBuf       [V00,T01] (  4,  4   )   byref  ->   r5         single-def
-;  V01 TypeCtx      [V01,T02] (  5,  3.60)     int  ->   r6         single-def
+;  V00 RetBuf       [V00,T02] (  4,  4   )   byref  ->   r6         single-def
+;  V01 TypeCtx      [V01,T01] (  5,  4   )     int  ->   r5         single-def
 ;  V02 arg0         [V02,T00] (  6,  4.50)     ref  ->   r4         class-hnd single-def <System.Collections.Generic.List`1[System.ValueTuple`2[int,System.__Canon]]>
 ;* V03 loc0         [V03    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.Span`1[System.ValueTuple`2[int,System.__Canon]]>
-;  V04 loc1         [V04,T07] (  4,  2   )     int  ->   r8        
-;  V05 loc2         [V05,T06] (  4,  2   )     ref  ->   r7         class-hnd exact single-def <<unknown class>>
+;  V04 loc1         [V04,T06] (  4,  2   )     int  ->   r8        
+;  V05 loc2         [V05,T05] (  4,  2   )     ref  ->   r7         class-hnd exact single-def <<unknown class>>
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V07 loc4         [V07,T08] (  3,  2   )     int  ->   r3         "spilling helperCall"
+;  V07 loc4         [V07,T08] (  2,  2   )     int  ->   r0         "spilling helperCall"
 ;* V08 tmp2         [V08    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[System.ValueTuple`2[int,System.__Canon]]>
 ;* V09 tmp3         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V10 tmp4         [V10    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V11 tmp5         [V11    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V12 tmp6         [V12    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;  V13 tmp7         [V13,T09] (  2,  2   )   byref  ->   r7         single-def "Inlining Arg"
+;  V13 tmp7         [V13,T07] (  2,  2   )   byref  ->   r7         single-def "Inlining Arg"
 ;* V14 tmp8         [V14    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V15 tmp9         [V15    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;  V16 tmp10        [V16,T04] (  3,  2.50)   byref  ->   r7         "field V03._reference (fldOffset=0x0)" P-INDEP
-;  V17 tmp11        [V17,T05] (  3,  2.50)     int  ->   r8         "field V03._length (fldOffset=0x4)" P-INDEP
-;  V18 tmp12        [V18,T10] (  2,  1   )   byref  ->   r7         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;  V19 tmp13        [V19,T11] (  2,  1   )     int  ->   r8         "field V08._length (fldOffset=0x4)" P-INDEP
-;  V20 rat0         [V20,T03] (  3,  2.80)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V16 tmp10        [V16,T03] (  3,  2.50)   byref  ->   r7         "field V03._reference (fldOffset=0x0)" P-INDEP
+;  V17 tmp11        [V17,T04] (  3,  2.50)     int  ->   r8         "field V03._length (fldOffset=0x4)" P-INDEP
+;  V18 tmp12        [V18,T09] (  2,  1   )   byref  ->   r7         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
+;  V19 tmp13        [V19,T10] (  2,  1   )     int  ->   r8         "field V08._length (fldOffset=0x4)" P-INDEP
 ;
 ; Lcl frame size = 12
 
@@ -37,19 +36,19 @@ G_M15939_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             sub     sp, 12
             add     r11, sp, 32
             str     r1, [r11-0x1C]
-            mov     r5, r0
-            ; byrRegs +[r5]
-            mov     r6, r1
+            mov     r6, r0
+            ; byrRegs +[r6]
+            mov     r5, r1
             mov     r4, r2
             ; gcrRegs +[r4]
                        ;; size=20 bbWeight=1 PerfScore 7.00
-G_M15939_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0020 {r5}, byref, isz
+G_M15939_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0040 {r6}, byref, isz
             movs    r7, 0
             mov     r8, 0
             cmp     r4, 0
-            beq     SHORT G_M15939_IG09
+            beq     SHORT G_M15939_IG06
                         ;; size=10 bbWeight=1 PerfScore 4.00
-G_M15939_IG03:        ; bbWeight=0.50, gcrefRegs=0010 {r4}, byrefRegs=0020 {r5}, byref, isz
+G_M15939_IG03:        ; bbWeight=0.50, gcrefRegs=0010 {r4}, byrefRegs=0040 {r6}, byref, isz
             ldr     r8, [r4+0x08]
             ldr     r7, [r4+0x04]
             ; gcrRegs +[r7]
@@ -64,34 +63,22 @@ G_M15939_IG03:        ; bbWeight=0.50, gcrefRegs=0010 {r4}, byrefRegs=0020 {r5},
             ldr     r3, [r3]
             blx     r3     // <unknown method>
                        ;; size=38 bbWeight=0.50 PerfScore 6.00
-G_M15939_IG04:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref, isz
+G_M15939_IG04:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0040 {r6}, byref, isz
             ldr     r0, [r7+0x04]
             cmp     r0, r8
-            blo     SHORT G_M15939_IG11
-            ldr     r0, [r6+0x20]
-            ldr     r3, [r0+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M15939_IG06
-                       ;; size=14 bbWeight=0.50 PerfScore 3.50
-G_M15939_IG05:        ; bbWeight=0.40, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref, isz
-            b       SHORT G_M15939_IG07
-                       ;; size=2 bbWeight=0.40 PerfScore 0.40
-G_M15939_IG06:        ; bbWeight=0.10, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref
-            mov     r0, r6
+            blo     SHORT G_M15939_IG08
+            mov     r0, r5
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r3, r0
-                       ;; size=22 bbWeight=0.10 PerfScore 0.70
-G_M15939_IG07:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r5}, byref, isz
-            ldr     r0, [r4+0x04]
-            ; gcrRegs +[r0]
-            ldr     r0, [r0]
-            ; gcrRegs -[r0]
-            cmp     r0, r3
-            beq     SHORT G_M15939_IG08
+            blx     r3        // CORINFO_HELP_MEMCPY
+            ldr     r1, [r4+0x04]
+            ; gcrRegs +[r1]
+            ldr     r1, [r1]
+            ; gcrRegs -[r1]
+            cmp     r1, r0
+            beq     SHORT G_M15939_IG05
             movw    r0, 0xd1ff
             movt    r0, 0xd1ff
             movw    r1, 0xd1ff
@@ -101,13 +88,19 @@ G_M15939_IG07:        ; bbWeight=0.50, gcrefRegs=0090 {r4 r7}, byrefRegs=0020 {r
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r4]
-                      ;; size=36 bbWeight=0.50 PerfScore 6.00
-G_M15939_IG08:        ; bbWeight=0.50, gcrefRegs=0080 {r7}, byrefRegs=0020 {r5}, byref, isz
+                      ;; size=62 bbWeight=0.50 PerfScore 10.50
+G_M15939_IG05:        ; bbWeight=0.50, gcrefRegs=0080 {r7}, byrefRegs=0040 {r6}, byref, isz
+            mov     r0, r5
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             adds    r7, 8
             ; gcrRegs -[r7]
             ; byrRegs +[r7]
             cmp     r8, 0
-            bge     SHORT G_M15939_IG09
+            bge     SHORT G_M15939_IG06
             movw    r0, 0xd1ff
             movt    r0, 0xd1ff
             movw    r1, 0xd1ff
@@ -116,17 +109,17 @@ G_M15939_IG08:        ; bbWeight=0.50, gcrefRegs=0080 {r7}, byrefRegs=0020 {r5},
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // <unknown method>
-                     ;; size=36 bbWeight=0.50 PerfScore 5.50
-G_M15939_IG09:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=00A0 {r5 r7}, byref
-            str     r7, [r5]
-            str     r8, [r5+0x04]
+                        ;; size=56 bbWeight=0.50 PerfScore 8.50
+G_M15939_IG06:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=00C0 {r6 r7}, byref
+            str     r7, [r6]
+            str     r8, [r6+0x04]
                       ;; size=6 bbWeight=1 PerfScore 2.00
-G_M15939_IG10:        ; bbWeight=1, epilog, nogc, extend
+G_M15939_IG07:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 12
             pop     {r4,r5,r6,r7,r8,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
-G_M15939_IG11:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
-            ; byrRegs -[r5 r7]
+G_M15939_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+            ; byrRegs -[r6-r7]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -134,7 +127,7 @@ G_M15939_IG11:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 204, prolog size 14, PerfScore 37.10, instruction count 70, allocated bytes for code 204 (MethodHash=d4abc1bc) for method System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.ValueTuple`2[int,System.__Canon]](System.Collections.Generic.List`1[System.ValueTuple`2[int,System.__Canon]]):System.Span`1[System.ValueTuple`2[int,System.__Canon]] (FullOpts)
+; Total bytes of code 212, prolog size 14, PerfScore 40.00, instruction count 70, allocated bytes for code 212 (MethodHash=d4abc1bc) for method System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.ValueTuple`2[int,System.__Canon]](System.Collections.Generic.List`1[System.ValueTuple`2[int,System.__Canon]]):System.Span`1[System.ValueTuple`2[int,System.__Canon]] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -146,7 +139,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 102 (0x00066) Actual length = 204 (0x0000cc)
+  Function Length   : 106 (0x0006a) Actual length = 212 (0x0000d4)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

+40 (+14.49%) : 2906.dasm - System.Threading.Tasks.Dataflow.Internal.Common:ReleaseAllPostponedMessagesSystem.__Canon (FullOpts) 

@@ -8,72 +8,68 @@
 ; 0 inlinees with PGO data; 6 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T09] (  7, 13.88)     int  ->  [sp+0x38]  EH-live single-def
-;  V01 arg0         [V01,T11] (  4, 10   )     ref  ->  [sp+0x14]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon]>
-;  V02 arg1         [V02,T10] (  5, 12   )     ref  ->  [sp+0x10]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
-;  V03 arg2         [V03,T13] (  3,  2   )   byref  ->  [sp+0x0C]  EH-live single-def
+;  V00 TypeCtx      [V00,T00] (  9, 27   )     int  ->  [sp+0x30]  EH-live single-def
+;  V01 arg0         [V01,T07] (  4, 10   )     ref  ->  [sp+0x14]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon]>
+;  V02 arg1         [V02,T06] (  5, 12   )     ref  ->  [sp+0x10]  class-hnd EH-live single-def <System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
+;  V03 arg2         [V03,T09] (  3,  2   )   byref  ->  [sp+0x0C]  EH-live single-def
 ;* V04 loc0         [V04    ] (  0,  0   )     int  ->  zero-ref   
-;  V05 loc1         [V05,T06] (  3, 17   )     int  ->  [sp+0x34]  do-not-enreg[Z] EH-live
-;  V06 loc2         [V06    ] (  8, 33   )  struct (16) [sp+0x20]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op double-align <System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
+;  V05 loc1         [V05,T03] (  3, 17   )     int  ->  [sp+0x2C]  do-not-enreg[Z] EH-live
+;  V06 loc2         [V06    ] (  8, 33   )  struct (16) [sp+0x18]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op double-align <System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader]>
 ;* V07 loc3         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <<unknown class>>
 ;  V08 OutArgs      [V08    ] (  1,  1   )  struct ( 4) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V09 tmp1         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V10 tmp2         [V10    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V11 tmp3         [V11,T07] (  2, 16   )     ref  ->   r4         class-hnd "impAppendStmt" <System.__Canon>
+;  V11 tmp3         [V11,T04] (  2, 16   )     ref  ->   r8         class-hnd "impAppendStmt" <System.__Canon>
 ;* V12 tmp4         [V12    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V13 tmp5         [V13,T00] (  4, 24   )     int  ->  [sp+0x1C]  "VirtualCall with runtime lookup"
+;  V13 tmp5         [V13,T01] (  3, 24   )     int  ->   r1         "VirtualCall with runtime lookup"
 ;* V14 tmp6         [V14    ] (  0,  0   )  struct ( 8) zero-ref    double-align "spilled call-like call argument" <System.Threading.Tasks.Dataflow.DataflowMessageHeader>
 ;* V15 tmp7         [V15    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V16 tmp8         [V16    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V17 tmp9         [V17,T08] (  2, 16   )     ref  ->   r4         class-hnd "impAppendStmt" <System.__Canon>
+;  V17 tmp9         [V17,T05] (  2, 16   )     ref  ->   r4         class-hnd "impAppendStmt" <System.__Canon>
 ;* V18 tmp10        [V18    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V19 tmp11        [V19,T01] (  4, 24   )     int  ->  [sp+0x18]  "VirtualCall with runtime lookup"
+;  V19 tmp11        [V19,T02] (  3, 24   )     int  ->   r1         "VirtualCall with runtime lookup"
 ;* V20 tmp12        [V20    ] (  0,  0   )  struct ( 8) zero-ref    double-align "spilled call-like call argument" <System.Threading.Tasks.Dataflow.DataflowMessageHeader>
-;  V21 tmp13        [V21,T15] (  2,  0   )     ref  ->   r1         class-hnd "impSpillSpecialSideEff" <<unknown class>>
-;  V22 tmp14        [V22,T12] (  2,  4   )     ref  ->   r1         class-hnd single-def "Inlining Arg" <System.Collections.Generic.Dictionary`2[System.__Canon,int]>
+;  V21 tmp13        [V21,T11] (  2,  0   )     ref  ->   r1         class-hnd "impSpillSpecialSideEff" <<unknown class>>
+;  V22 tmp14        [V22,T08] (  2,  4   )     ref  ->   r1         class-hnd single-def "Inlining Arg" <System.Collections.Generic.Dictionary`2[System.__Canon,int]>
 ;* V23 tmp15        [V23    ] (  0,  0   )    long  ->  zero-ref    "field V14._id (fldOffset=0x0)" P-INDEP
 ;* V24 tmp16        [V24    ] (  0,  0   )    long  ->  zero-ref    "field V20._id (fldOffset=0x0)" P-INDEP
-;  V25 PSPSym       [V25,T14] (  1,  1   )     int  ->  [sp+0x40]  do-not-enreg[V] "PSPSym"
-;  V26 rat0         [V26,T02] (  3, 22.40)     int  ->   r0         "spilling expr"
-;  V27 rat1         [V27,T04] (  3, 17.92)     int  ->   r0         "fgMakeTemp is creating a new local variable"
-;  V28 rat2         [V28,T03] (  3, 22.40)     int  ->   r0         "spilling expr"
-;  V29 rat3         [V29,T05] (  3, 17.92)     int  ->   r0         "fgMakeTemp is creating a new local variable"
+;  V25 PSPSym       [V25,T10] (  1,  1   )     int  ->  [sp+0x38]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 68
+; Lcl frame size = 60
 
 G_M56511_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
             push    {r4,r5,r6,r7,r8,r11,lr}
-            sub     sp, 68
-            add     r11, sp, 88
+            sub     sp, 60
+            add     r11, sp, 80
             movs    r4, 0
-            str     r4, [sp+0x20]    // [V06 loc2]
-            add     r4, sp, 96
-            str     r4, [sp+0x40]  // [V25 PSPSym]
+            str     r4, [sp+0x18]  // [V06 loc2]
+            add     r4, sp, 88
+            str     r4, [sp+0x38]  // [V25 PSPSym]
             str     r0, [r11-0x1C]
-            str     r0, [sp+0x38]    // [V00 TypeCtx]
+            str     r0, [sp+0x30] // [V00 TypeCtx]
             str     r1, [sp+0x14]   // [V01 arg0]
             ; GC ptr vars +{V01}
             str     r2, [sp+0x10]  // [V02 arg1]
             ; GC ptr vars +{V02}
             str     r3, [sp+0x0C]  // [V03 arg2]
             ; GC ptr vars +{V03}
-            mov     r5, r0
-            mov     r7, r1
-            ; gcrRegs +[r7]
-            mov     r6, r2
+            mov     r4, r0
+            mov     r6, r1
             ; gcrRegs +[r6]
-            mov     r8, r3
-            ; byrRegs +[r8]
+            mov     r5, r2
+            ; gcrRegs +[r5]
+            mov     r7, r3
+            ; byrRegs +[r7]
                         ;; size=38 bbWeight=1 PerfScore 16.00
-G_M56511_IG02:        ; bbWeight=1, gcVars=00002C00 {V01 V02 V03}, gcrefRegs=00C0 {r6 r7}, byrefRegs=0100 {r8}, gcvars, byref, isz
-            ldr     r1, [r6+0x08]
+G_M56511_IG02:        ; bbWeight=1, gcVars=000002C0 {V01 V02 V03}, gcrefRegs=0060 {r5 r6}, byrefRegs=0080 {r7}, gcvars, byref, isz
+            ldr     r1, [r5+0x08]
             ; gcrRegs +[r1]
             ldrsb   r1, [r1]
             ; gcrRegs -[r1]
             movs    r1, 0
-            str     r1, [sp+0x34]   // [V05 loc1]
-            add     r1, sp, 32 // [V06 loc2]
-            mov     r0, r6
+            str     r1, [sp+0x2C]  // [V05 loc1]
+            add     r1, sp, 24 // [V06 loc2]
+            mov     r0, r5
             ; gcrRegs +[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -82,99 +78,90 @@ G_M56511_IG02:        ; bbWeight=1, gcVars=00002C00 {V01 V02 V03}, gcrefRegs=00C
             ; gcrRegs -[r0]
             ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M56511_IG13
+            beq     SHORT G_M56511_IG05
                         ;; size=30 bbWeight=1 PerfScore 12.00
-G_M56511_IG03:        ; bbWeight=4, gcrefRegs=00C0 {r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            ldr     r4, [sp+0x20]  // [V06 loc2]
-            ; gcrRegs +[r4]
-            ldr     r0, [r5+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 12
-            ble     SHORT G_M56511_IG06
-                       ;; size=10 bbWeight=4 PerfScore 20.00
-G_M56511_IG04:        ; bbWeight=3.20, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            ldr     r0, [r0+0x0C]
-            cmp     r0, 0
-            beq     SHORT G_M56511_IG06
-                       ;; size=6 bbWeight=3.20 PerfScore 9.60
-G_M56511_IG05:        ; bbWeight=2.56, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            mov     r3, r0
-            str     r3, [sp+0x1C]  // [V13 tmp5]
-            b       SHORT G_M56511_IG07
-                       ;; size=6 bbWeight=2.56 PerfScore 7.68
-G_M56511_IG06:        ; bbWeight=1.44, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref
-            mov     r0, r5
+G_M56511_IG03:        ; bbWeight=4, gcrefRegs=0060 {r5 r6}, byrefRegs=0080 {r7}, byref, isz
+            mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-            str     r0, [sp+0x1C]    // [V13 tmp5]
-                       ;; size=22 bbWeight=1.44 PerfScore 10.08
-G_M56511_IG07:        ; bbWeight=4, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            str     r7, [sp]   // [V08 OutArgs]
-            ; gcr arg write
-            ldr     r2, [sp+0x28]  // [V06 loc2+0x08]
-            ldr     r3, [sp+0x2C]  // [V06 loc2+0x0c]
             mov     r0, r4
-            ; gcrRegs +[r0]
-            ldr     r4, [sp+0x1C]  // [V13 tmp5]
-            ; gcrRegs -[r4]
-            ldr     r1, [r4]
-            blx     r1
-            ; gcrRegs -[r0]
-            ; gcr arg pop 0
-            cmp     r0, 0
-            beq     SHORT G_M56511_IG12
-            ldr     r4, [sp+0x20]  // [V06 loc2]
-            ; gcrRegs +[r4]
-            ldr     r0, [r5+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 16
-            ble     SHORT G_M56511_IG10
-                       ;; size=28 bbWeight=4 PerfScore 56.00
-G_M56511_IG08:        ; bbWeight=3.20, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            ldr     r0, [r0+0x10]
-            cmp     r0, 0
-            beq     SHORT G_M56511_IG10
-                       ;; size=6 bbWeight=3.20 PerfScore 9.60
-G_M56511_IG09:        ; bbWeight=2.56, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref, isz
-            mov     r3, r0
-            str     r3, [sp+0x18]  // [V19 tmp11]
-            b       SHORT G_M56511_IG11
-                       ;; size=6 bbWeight=2.56 PerfScore 7.68
-G_M56511_IG10:        ; bbWeight=1.44, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref
-            mov     r0, r5
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-            str     r0, [sp+0x18]    // [V19 tmp11]
-                       ;; size=22 bbWeight=1.44 PerfScore 10.08
-G_M56511_IG11:        ; bbWeight=4, gcrefRegs=00D0 {r4 r6 r7}, byrefRegs=0100 {r8}, byref
-            str     r7, [sp]   // [V08 OutArgs]
+            ldr     r8, [sp+0x18] // [V06 loc2]
+            ; gcrRegs +[r8]
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            mov     r1, r0
+            str     r6, [sp]   // [V08 OutArgs]
             ; gcr arg write
-            ldr     r2, [sp+0x28]  // [V06 loc2+0x08]
-            ldr     r3, [sp+0x2C]  // [V06 loc2+0x0c]
+            ldr     r2, [sp+0x20]   // [V06 loc2+0x08]
+            ldr     r3, [sp+0x24]  // [V06 loc2+0x0c]
+            mov     r0, r8
+            ; gcrRegs +[r0]
+            mov     r4, r1
+            ldr     r1, [r1]
+            blx     r1
+            ; gcrRegs -[r0 r8]
+            ; gcr arg pop 0
+            cmp     r0, 0
+            beq     SHORT G_M56511_IG04
+            ldr     r0, [sp+0x30]  // [V00 TypeCtx]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            ldr     r0, [sp+0x30]  // [V00 TypeCtx]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            ldr     r4, [sp+0x18]  // [V06 loc2]
+            ; gcrRegs +[r4]
+            ldr     r0, [sp+0x30]  // [V00 TypeCtx]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
+            mov     r1, r0
+            str     r6, [sp]   // [V08 OutArgs]
+            ; gcr arg write
+            ldr     r2, [sp+0x20]  // [V06 loc2+0x08]
+            ldr     r3, [sp+0x24]  // [V06 loc2+0x0c]
             mov     r0, r4
             ; gcrRegs +[r0]
-            ldr     r4, [sp+0x18] // [V19 tmp11]
+            mov     r4, r1
             ; gcrRegs -[r4]
-            ldr     r1, [r4]
+            ldr     r1, [r1]
             blx     r1
             ; gcrRegs -[r0]
             ; gcr arg pop 0
...

+34 (+17.00%) : 67.dasm - System.Linq.Enumerable:gEnumerableToArray|296_0System.__Canon:System.Canon 

@@ -8,13 +8,13 @@
 ; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->   r4         single-def
-;  V01 arg0         [V01,T05] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  8,  8   )     int  ->   r4         single-def
+;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r5         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V02 loc0         [V02    ] (  1,  1   )  struct (32) [sp+0x94]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon]>
 ;  V03 loc1         [V03    ] (  5,  5   )  struct (136) [sp+0x0C]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]>
-;  V04 loc2         [V04,T14] (  2,  2   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
+;  V04 loc2         [V04,T08] (  2,  2   )     ref  ->   r5         class-hnd single-def <System.__Canon[]>
 ;# V05 OutArgs      [V05    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V06 tmp1         [V06    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V06 tmp1         [V06,T04] (  2,  4   )     int  ->   r6         "spilling helperCall"
 ;* V07 tmp2         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V08 tmp3         [V08    ] (  3,  6   )  struct ( 8) [sp+0x04]  do-not-enreg[HS] must-init hidden-struct-arg "spilled call-like call argument" <System.Span`1[System.__Canon]>
 ;* V09 tmp4         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
@@ -25,16 +25,9 @@
 ;  V14 tmp9         [V14,T02] (  3,  6   )     int  ->  [sp+0x08]  do-not-enreg[H] hidden-struct-arg "field V08._length (fldOffset=0x4)" P-DEP
 ;* V15 tmp10        [V15    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V12._reference (fldOffset=0x0)" P-INDEP
 ;* V16 tmp11        [V16    ] (  0,  0   )     int  ->  zero-ref    "field V12._length (fldOffset=0x4)" P-INDEP
-;  V17 tmp12        [V17,T10] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V18 tmp13        [V18,T11] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V19 tmp14        [V19,T12] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V20 tmp15        [V20,T13] (  2,  4   )     int  ->   r1         "argument with side effect"
-;  V21 cse0         [V21,T07] (  4,  4   )     int  ->   r6         "CSE - aggressive"
-;  V22 rat0         [V22,T08] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V23 rat1         [V23,T03] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
-;  V24 rat2         [V24,T09] (  3,  4   )     int  ->   r6         "runtime lookup"
-;  V25 rat3         [V25,T04] (  3,  5.60)     int  ->   r0         "spilling expr"
-;  V26 rat4         [V26,T06] (  3,  4.48)     int  ->   r6         "fgMakeTemp is creating a new local variable"
+;  V17 tmp12        [V17,T05] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V18 tmp13        [V18,T06] (  2,  4   )     int  ->   r1         "argument with side effect"
+;  V19 tmp14        [V19,T07] (  2,  4   )     int  ->   r1         "argument with side effect"
 ;
 ; Lcl frame size = 188
 
@@ -54,70 +47,49 @@ G_M19942_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mov     r5, r1
             ; gcrRegs +[r5]
                        ;; size=34 bbWeight=1 PerfScore 13.00
-G_M19942_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M19942_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG03:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M19942_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M19942_IG04:        ; bbWeight=0.20, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M19942_IG02:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=22 bbWeight=0.20 PerfScore 1.40
-G_M19942_IG05:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+            blx     r3      // CORINFO_HELP_MEMCPY
+            mov     r6, r0
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             add     r0, sp, 4
             add     r2, sp, 148
+            mov     r1, r6
             movs    r3, 8
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // <PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon],System.__Canon](byref,int):System.Span`1[System.__Canon]
-                       ;; size=20 bbWeight=1 PerfScore 7.00
-G_M19942_IG06:        ; bbWeight=1, nogc, extend
+                     ;; size=64 bbWeight=1 PerfScore 21.00
+G_M19942_IG03:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x84]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x88]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG07:        ; bbWeight=1, nogc, extend
+G_M19942_IG04:        ; bbWeight=1, nogc, extend
             ldr     r0, [sp+0x04]
             str     r0, [sp+0x8C]
             ldr     r0, [sp+0x08]
             str     r0, [sp+0x90]
                        ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG08:        ; bbWeight=1, isz, extend
-            ldr     r0, [r4+0x20]
-            ldr     r1, [r0+0x04]
-            cmp     r1, 12
-            ble     SHORT G_M19942_IG11
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M19942_IG09:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r6, [r0+0x0C]
-            cmp     r6, 0
-            beq     SHORT G_M19942_IG11
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M19942_IG10:        ; bbWeight=0.64, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M19942_IG12
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M19942_IG11:        ; bbWeight=0.36, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
+G_M19942_IG05:        ; bbWeight=1, extend
             mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r6, r0
-                       ;; size=22 bbWeight=0.36 PerfScore 2.52
-G_M19942_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
-            mov     r1, r6
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             mov     r2, r5
             ; gcrRegs +[r2]
@@ -126,31 +98,43 @@ G_M19942_IG12:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byre
             ldr     r3, [r3]
             blx     r3     // <unknown method>
             ; gcrRegs -[r2 r5]
-            mov     r1, r6
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
             add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:ToArray():System.__Canon[]:this
             ; gcrRegs +[r0]
-            mov     r4, r0
-            ; gcrRegs +[r4]
-            mov     r1, r6
-            add     r0, sp, 12
+            mov     r5, r0
+            ; gcrRegs +[r5]
+            mov     r0, r4
             ; gcrRegs -[r0]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r1, r0
+            add     r0, sp, 12
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:Dispose():this
-            mov     r0, r4
+            mov     r0, r5
             ; gcrRegs +[r0]
-                       ;; size=54 bbWeight=1 PerfScore 21.00
-G_M19942_IG13:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=114 bbWeight=1 PerfScore 39.00
+G_M19942_IG06:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 188
             pop     {r4,r5,r6,r11,pc}
                        ;; size=6 bbWeight=1 PerfScore 2.00
 
-; Total bytes of code 200, prolog size 30, PerfScore 66.76, instruction count 78, allocated bytes for code 200 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
+; Total bytes of code 234, prolog size 30, PerfScore 83.00, instruction count 83, allocated bytes for code 234 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -162,7 +146,7 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 100 (0x00064) Actual length = 200 (0x0000c8)
+  Function Length   : 117 (0x00075) Actual length = 234 (0x0000ea)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----

realworld.run.linux.arm.checked.mch

-28 (-34.15%) : 4173.dasm - Microsoft.FSharp.Collections.IEnumerator:mkSeqSystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -2,53 +2,38 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; 0 inlinees with PGO data; 2 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r4         class-hnd single-def <Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V03 tmp1         [V03,T01] (  3,  6   )     ref  ->   r2         class-hnd exact single-def "NewObj constructor temp" <Microsoft.FSharp.Collections.IEnumerator+mkSeq@177[System.__Canon]>
 ;* V04 tmp2         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 rat0         [V05,T04] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V06 rat1         [V06,T02] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38576_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M38576_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r1, [r1+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M38576_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38576_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M38576_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M38576_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                     ;; size=6 bbWeight=1 PerfScore 3.00
+G_M38576_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M38576_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
+            ; gcr arg pop 0
             mov     r2, r0
             ; gcrRegs +[r2]
             adds    r0, r2, 4
@@ -63,13 +48,12 @@ G_M38576_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byre
             ; byrRegs -[r0]
             mov     r0, r2
             ; gcrRegs +[r0]
-                      ;; size=30 bbWeight=1 PerfScore 11.00
-G_M38576_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+                       ;; size=46 bbWeight=1 PerfScore 15.00
+G_M38576_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 82, prolog size 14, PerfScore 24.00, instruction count 29, allocated bytes for code 82 (MethodHash=af2b694f) for method Microsoft.FSharp.Collections.IEnumerator:mkSeq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
+; Total bytes of code 54, prolog size 4, PerfScore 19.00, instruction count 19, allocated bytes for code 54 (MethodHash=af2b694f) for method Microsoft.FSharp.Collections.IEnumerator:mkSeq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -81,11 +65,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 41 (0x00029) Actual length = 82 (0x000052)
+  Function Length   : 27 (0x0001b) Actual length = 54 (0x000036)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-28 (-34.15%) : 3330.dasm - Microsoft.FSharp.Control.AsyncPrimitives:MakeAsyncSystem.__Canon:Microsoft.FSharp.Control.FSharpAsync`1System.__Canon 

@@ -2,53 +2,38 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; 0 inlinees with PGO data; 2 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T03] (  3,  3   )     ref  ->   r4         class-hnd single-def <Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon]>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V03 tmp1         [V03,T01] (  3,  6   )     ref  ->   r2         class-hnd exact single-def "NewObj constructor temp" <Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon]>
 ;* V04 tmp2         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 rat0         [V05,T04] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V06 rat1         [V06,T02] (  3,  5.60)     int  ->   r1         "fgMakeTemp is creating a new local variable"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M3011_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
-G_M3011_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r1, [r1+0x08]
-            cmp     r1, 0
-            beq     SHORT G_M3011_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M3011_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M3011_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M3011_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+                      ;; size=6 bbWeight=1 PerfScore 3.00
+G_M3011_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M3011_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
+            ; gcr arg pop 0
             mov     r2, r0
             ; gcrRegs +[r2]
             adds    r0, r2, 4
@@ -63,13 +48,12 @@ G_M3011_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             ; byrRegs -[r0]
             mov     r0, r2
             ; gcrRegs +[r0]
-                      ;; size=30 bbWeight=1 PerfScore 11.00
-G_M3011_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=1 PerfScore 2.00
+                       ;; size=46 bbWeight=1 PerfScore 15.00
+G_M3011_IG03:        ; bbWeight=1, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 82, prolog size 14, PerfScore 24.00, instruction count 29, allocated bytes for code 82 (MethodHash=daccf43c) for method Microsoft.FSharp.Control.AsyncPrimitives:MakeAsync[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)
+; Total bytes of code 54, prolog size 4, PerfScore 19.00, instruction count 19, allocated bytes for code 54 (MethodHash=daccf43c) for method Microsoft.FSharp.Control.AsyncPrimitives:MakeAsync[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -81,11 +65,11 @@ Unwind Info:
   E bit             : 1
   X bit             : 0
   Vers              : 0
-  Function Length   : 41 (0x00029) Actual length = 82 (0x000052)
+  Function Length   : 27 (0x0001b) Actual length = 54 (0x000036)
   --- One epilog, unwind codes at 0
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

-30 (-33.33%) : 253.dasm - System.Linq.Enumerable:IsEmptyArraySystem.__Canon:ubyte (FullOpts) 

@@ -2,82 +2,66 @@
 ; Emitting BLENDED_CODE for generic ARM - Unix
 ; FullOpts code
 ; optimized code
-; r11 based frame
+; sp based frame
 ; partially interruptible
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V02 loc0         [V02,T05] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->   r0         single-def
+;  V01 arg0         [V01,T01] (  3,  3   )     ref  ->   r4         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V02 loc0         [V02,T03] (  3,  2.50)     ref  ->   r0         class-hnd single-def <<unknown class>>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 tmp2         [V05,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V06 rat0         [V06,T03] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->   r3         "fgMakeTemp is creating a new local variable"
+;  V05 tmp2         [V05,T02] (  2,  4   )     int  ->   r0         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M38282_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, nogc <-- Prolog IG
-            push    {r4,r11,lr}
-            sub     sp, 12
-            add     r11, sp, 16
-            str     r0, [r11-0x0C]
+            push    {r2,r3,r4,lr}
+            str     r0, [sp+0x04]
             mov     r4, r1
             ; gcrRegs +[r4]
-                      ;; size=16 bbWeight=1 PerfScore 5.00
+                      ;; size=6 bbWeight=1 PerfScore 3.00
 G_M38282_IG02:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x08]
-            cmp     r3, 0
-            beq     SHORT G_M38282_IG04
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M38282_IG03:        ; bbWeight=0.80, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
-            mov     r0, r3
-            b       SHORT G_M38282_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.60
-G_M38282_IG04:        ; bbWeight=0.20, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=18 bbWeight=0.20 PerfScore 1.00
-G_M38282_IG05:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref, isz
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             mov     r1, r4
             ; gcrRegs +[r1]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-            blx     r3       // CORINFO_HELP_ISINSTANCEOFARRAY
+            blx     r3       // CORINFO_HELP_ISINSTANCEOFINTERFACE
             ; gcrRegs -[r1 r4] +[r0]
+            ; gcr arg pop 0
             cmp     r0, 0
-            beq     SHORT G_M38282_IG09
-                       ;; size=18 bbWeight=1 PerfScore 7.00
-G_M38282_IG06:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
+            beq     SHORT G_M38282_IG06
+                       ;; size=36 bbWeight=1 PerfScore 12.00
+G_M38282_IG03:        ; bbWeight=0.50, gcrefRegs=0001 {r0}, byrefRegs=0000 {}, byref, isz
             ldr     r0, [r0+0x04]
             ; gcrRegs -[r0]
             cmp     r0, 0
-            beq     SHORT G_M38282_IG07
+            beq     SHORT G_M38282_IG04
             movs    r0, 0
-            b       SHORT G_M38282_IG08
+            b       SHORT G_M38282_IG05
                      ;; size=10 bbWeight=0.50 PerfScore 2.50
-G_M38282_IG07:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M38282_IG04:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movs    r0, 1
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG08:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
-G_M38282_IG09:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M38282_IG05:        ; bbWeight=0.50, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
+G_M38282_IG06:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 0
                        ;; size=2 bbWeight=0.50 PerfScore 0.50
-G_M38282_IG10:        ; bbWeight=0.50, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r11,pc}
-                       ;; size=6 bbWeight=0.50 PerfScore 1.00
+G_M38282_IG07:        ; bbWeight=0.50, epilog, nogc, extend
+            pop     {r2,r3,r4,pc}
+                       ;; size=2 bbWeight=0.50 PerfScore 0.50
 
-; Total bytes of code 90, prolog size 14, PerfScore 24.10, instruction count 34, allocated bytes for code 90 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
+; Total bytes of code 60, prolog size 4, PerfScore 19.50, instruction count 24, allocated bytes for code 60 (MethodHash=6cb36a75) for method System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -89,7 +73,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 45 (0x0002d) Actual length = 90 (0x00005a)
+  Function Length   : 30 (0x0001e) Actual length = 60 (0x00003c)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -101,7 +85,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A8 10       pop {r4,r11,lr}                     ; opsize 32
+    ED 1C       pop {r2,r3,r4,lr}                   ; opsize 16
+    FF          end
     FF          end

+8 (+5.00%) : 3300.dasm - System.Array:IndexOfSystem.__Canon:int (FullOpts) 

@@ -8,11 +8,11 @@
 ; 0 inlinees with PGO data; 2 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T02] (  5,  4.36)     int  ->   r0         single-def
+;  V00 TypeCtx      [V00,T01] (  5,  5   )     int  ->   r5         single-def
 ;  V01 arg0         [V01,T00] (  5,  5   )     ref  ->   r4         class-hnd single-def <System.__Canon[]>
-;  V02 arg1         [V02,T05] (  3,  3   )     ref  ->   r6         ld-addr-op class-hnd single-def <System.__Canon>
-;  V03 arg2         [V03,T01] (  5,  5   )     int  ->   r5         single-def
-;  V04 arg3         [V04,T09] (  2,  2   )     int  ->   r7         single-def
+;  V02 arg1         [V02,T04] (  3,  3   )     ref  ->   r7         ld-addr-op class-hnd single-def <System.__Canon>
+;  V03 arg2         [V03,T02] (  5,  5   )     int  ->   r6         single-def
+;  V04 arg3         [V04,T06] (  2,  2   )     int  ->   r8         single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -24,79 +24,66 @@
 ;* V13 tmp4         [V13    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V14 tmp5         [V14    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;  V15 tmp6         [V15,T03] (  3,  6   )     ref  ->   r0         single-def "argument with side effect"
-;  V16 cse0         [V16,T08] (  3,  3   )     int  ->   r1         "CSE - aggressive"
-;  V17 rat0         [V17,T07] (  3,  4   )     int  ->   r1         "runtime lookup"
-;  V18 rat1         [V18,T04] (  3,  5.60)     int  ->   r1         "spilling expr"
-;  V19 rat2         [V19,T06] (  3,  4.48)     int  ->   r1         "fgMakeTemp is creating a new local variable"
+;  V16 cse0         [V16,T05] (  3,  3   )     int  ->   r0         "CSE - aggressive"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 20
 
 G_M13831_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r11,lr}
-            sub     sp, 16
-            add     r11, sp, 32
-            str     r0, [r11-0x14]
+            push    {r4,r5,r6,r7,r8,r11,lr}
+            sub     sp, 20
+            add     r11, sp, 40
+            str     r0, [r11-0x1C]
+            mov     r5, r0
             mov     r4, r1
             ; gcrRegs +[r4]
-            mov     r6, r2
-            ; gcrRegs +[r6]
-            mov     r5, r3
-            ldr     r7, [sp+0x28]
-                       ;; size=22 bbWeight=1 PerfScore 8.00
-G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
+            mov     r7, r2
+            ; gcrRegs +[r7]
+            mov     r6, r3
+            ldr     r8, [sp+0x30]
+                       ;; size=26 bbWeight=1 PerfScore 9.00
+G_M13831_IG02:        ; bbWeight=1, gcrefRegs=0090 {r4 r7}, byrefRegs=0000 {}, byref, isz
             cmp     r4, 0
-            beq     SHORT G_M13831_IG08
-            ldr     r1, [r4+0x04]
-            cmp     r1, r5
-            blo     SHORT G_M13831_IG09
-            subs    r1, r1, r5
-            cmp     r1, r7
-            blo     SHORT G_M13831_IG10
-            ldr     r1, [r0+0x20]
-            ldr     r3, [r1+0x04]
-            cmp     r3, 12
-            ble     SHORT G_M13831_IG05
-                       ;; size=24 bbWeight=1 PerfScore 12.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            ldr     r1, [r1+0x0C]
-            cmp     r1, 0
-            beq     SHORT G_M13831_IG05
-                       ;; size=6 bbWeight=0.80 PerfScore 2.40
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 0.64
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
+            beq     SHORT G_M13831_IG04
+            ldr     r0, [r4+0x04]
+            cmp     r0, r6
+            blo     SHORT G_M13831_IG05
+            subs    r0, r0, r6
+            cmp     r0, r8
+            blo     SHORT G_M13831_IG06
+            mov     r0, r5
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r1, r0
-                       ;; size=20 bbWeight=0.36 PerfScore 2.16
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=0050 {r4 r6}, byrefRegs=0000 {}, byref
-            mov     r0, r1
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r0, r5
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.Collections.Generic.EqualityComparer`1[System.__Canon]:get_Default():System.Collections.Generic.EqualityComparer`1[System.__Canon]
             ; gcrRegs +[r0]
-            str     r7, [sp]
+            str     r8, [sp]
             mov     r1, r4
             ; gcrRegs +[r1]
-            mov     r2, r6
+            mov     r2, r7
             ; gcrRegs +[r2]
-            mov     r3, r5
+            mov     r3, r6
             ldr     lr, [r0]
             ldr     lr, [lr+0x30]
             ldr     lr, [lr]
             blx     lr     // <unknown method>
-            ; gcrRegs -[r0-r2 r4 r6]
-                       ;; size=36 bbWeight=1 PerfScore 13.00
-G_M13831_IG07:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 16
-            pop     {r4,r5,r6,r7,r11,pc}
+            ; gcrRegs -[r0-r2 r4 r7]
+                       ;; size=92 bbWeight=1 PerfScore 32.00
+G_M13831_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 20
+            pop     {r4,r5,r6,r7,r8,r11,pc}
                         ;; size=6 bbWeight=1 PerfScore 2.00
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref
             movs    r0, 2
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
@@ -104,14 +91,14 @@ G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             blx     r3     // System.ThrowHelper:ThrowArgumentNullException(int)
             bkpt    
                        ;; size=16 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
@@ -119,7 +106,7 @@ G_M13831_IG10:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
             bkpt    
                        ;; size=14 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 160, prolog size 14, PerfScore 40.20, instruction count 61, allocated bytes for code 160 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
+; Total bytes of code 168, prolog size 14, PerfScore 43.00, instruction count 59, allocated bytes for code 168 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -131,7 +118,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 80 (0x00050) Actual length = 160 (0x0000a0)
+  Function Length   : 84 (0x00054) Actual length = 168 (0x0000a8)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -139,7 +126,7 @@ Unwind Info:
   Epilog Start Index         : 0 (0x00)
   ---- Unwind codes ----
     ---- Epilog start at index 0 ----
-    04          add sp, sp, #16                     ; opsize 16
-    A8 F0       pop {r4,r5,r6,r7,r11,lr}            ; opsize 32
+    05          add sp, sp, #20                     ; opsize 16
+    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
     FF          end

+12 (+6.06%) : 3328.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvokeSystem.Canon,System.Canon:Microsoft.FSharp.Control.AsyncReturn (FullOpts) 

@@ -8,24 +8,22 @@
 ; 0 inlinees with PGO data; 4 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r4         single-def
+;  V00 TypeCtx      [V00,T01] (  5,  4   )     int  ->  [sp+0x08]  EH-live single-def
 ;  V01 arg0         [V01    ] (  6,  4   )  struct ( 4) [sp+0x24]  ld-addr-op single-def <Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]>
-;  V02 arg1         [V02,T04] (  3,  3   )     ref  ->   r2         class-hnd single-def <System.__Canon>
+;  V02 arg1         [V02,T03] (  3,  3   )     ref  ->   r2         class-hnd single-def <System.__Canon>
 ;  V03 arg2         [V03,T02] (  4,  4   )     ref  ->   r3         class-hnd single-def <Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]>
-;  V04 loc0         [V04,T08] (  2,  2   )     ref  ->   r5         class-hnd single-def <<unknown class>>
-;  V05 loc1         [V05,T07] (  3,  2   )   ubyte  ->  [sp+0x08]  do-not-enreg[M] EH-live
+;  V04 loc0         [V04,T06] (  2,  2   )     ref  ->   r4         class-hnd single-def <<unknown class>>
+;  V05 loc1         [V05,T05] (  3,  2   )   ubyte  ->  [sp+0x04]  do-not-enreg[M] EH-live
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V08 tmp2         [V08    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V09 tmp3         [V09,T11] (  2,  0   )     ref  ->   r0         class-hnd single-def "Inline stloc first use temp" <<unknown class>>
-;  V10 tmp4         [V10,T12] (  2,  0   )     ref  ->   r4         class-hnd single-def "Inline stloc first use temp" <<unknown class>>
-;  V11 tmp5         [V11,T13] (  2,  0   )     ref  ->   r5         class-hnd single-def "impAppendStmt" <<unknown class>>
-;  V12 tmp6         [V12,T10] (  3,  0   )     ref  ->  [sp+0x04]  class-hnd exact spill-single-def "NewObj constructor temp" <<unknown class>>
-;  V13 tmp7         [V13,T01] (  6,  4   )     ref  ->  [sp+0x24]  do-not-enreg[H] EH-live single-def "field V01.contents (fldOffset=0x0)" P-DEP
-;  V14 tmp8         [V14,T06] (  2,  4   )     int  ->   r0         "argument with side effect"
-;  V15 PSPSym       [V15,T09] (  1,  1   )     int  ->  [sp+0x10]  do-not-enreg[V] "PSPSym"
-;  V16 rat0         [V16,T05] (  3,  4   )     int  ->   r0         "runtime lookup"
-;  V17 rat1         [V17,T03] (  3,  5.60)     int  ->   r0         "fgMakeTemp is creating a new local variable"
+;  V09 tmp3         [V09,T09] (  2,  0   )     ref  ->   r0         class-hnd single-def "Inline stloc first use temp" <<unknown class>>
+;  V10 tmp4         [V10,T10] (  2,  0   )     ref  ->   r4         class-hnd single-def "Inline stloc first use temp" <<unknown class>>
+;  V11 tmp5         [V11,T11] (  2,  0   )     ref  ->   r5         class-hnd single-def "impAppendStmt" <<unknown class>>
+;  V12 tmp6         [V12,T08] (  3,  0   )     ref  ->  [sp+0x00]  class-hnd exact spill-single-def "NewObj constructor temp" <<unknown class>>
+;  V13 tmp7         [V13,T00] (  6,  4   )     ref  ->  [sp+0x24]  do-not-enreg[H] EH-live single-def "field V01.contents (fldOffset=0x0)" P-DEP
+;  V14 tmp8         [V14,T04] (  2,  4   )     int  ->   r0         "argument with side effect"
+;  V15 PSPSym       [V15,T07] (  1,  1   )     int  ->  [sp+0x10]  do-not-enreg[V] "PSPSym"
 ;
 ; Lcl frame size = 20
 
@@ -37,12 +35,12 @@ G_M49933_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             add     r1, sp, 40
             str     r1, [sp+0x10]  // [V15 PSPSym]
             str     r0, [r11-0x10]
-            mov     r4, r0
+            str     r0, [sp+0x08]  // [V00 TypeCtx]
                         ;; size=22 bbWeight=1 PerfScore 8.00
 G_M49933_IG02:        ; bbWeight=1, gcrefRegs=000C {r2 r3}, byrefRegs=0000 {}, byref
             ; gcrRegs +[r2-r3]
-            movs    r0, 0
-            str     r0, [sp+0x08]  // [V05 loc1]
+            movs    r1, 0
+            str     r1, [sp+0x04]  // [V05 loc1]
                        ;; size=4 bbWeight=1 PerfScore 2.00
 G_M49933_IG03:        ; bbWeight=1, gcrefRegs=000C {r2 r3}, byrefRegs=0000 {}, byref
             mov     r0, r3
@@ -56,56 +54,52 @@ G_M49933_IG03:        ; bbWeight=1, gcrefRegs=000C {r2 r3}, byrefRegs=0000 {}, b
             blx     r3     // <unknown method>
             ; gcrRegs -[r1-r2]
             ; gcr arg pop 0
-            mov     r5, r0
-            ; gcrRegs +[r5]
+            mov     r4, r0
+            ; gcrRegs +[r4]
             movs    r0, 1
             ; gcrRegs -[r0]
-            str     r0, [sp+0x08] // [V05 loc1]
+            str     r0, [sp+0x04]    // [V05 loc1]
                        ;; size=18 bbWeight=1 PerfScore 9.00
-G_M49933_IG04:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            ldr     r0, [r4+0x20]
-            ldr     r0, [r0+0x0C]
-            cmp     r0, 0
-            beq     SHORT G_M49933_IG06
-                       ;; size=8 bbWeight=1 PerfScore 4.00
-G_M49933_IG05:        ; bbWeight=0.80, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M49933_IG07
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M49933_IG06:        ; bbWeight=0.20, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
-            mov     r0, r4
+G_M49933_IG04:        ; bbWeight=1, gcrefRegs=0010 {r4}, byrefRegs=0000 {}, byref
+            ldr     r0, [sp+0x08]  // [V00 TypeCtx]
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
+            blx     r3        // CORINFO_HELP_MEMCPY
             ; gcr arg pop 0
-                     ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M49933_IG07:        ; bbWeight=1, gcrefRegs=0020 {r5}, byrefRegs=0000 {}, byref
-            mov     r1, r5
+            mov     r1, r4
             ; gcrRegs +[r1]
             ldr     r2, [sp+0x24]  // [V13 tmp7]
             ; gcrRegs +[r2]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
-                     ;; size=14 bbWeight=1 PerfScore 5.00
-G_M49933_IG08:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=34 bbWeight=1 PerfScore 11.00
+G_M49933_IG05:        ; bbWeight=1, epilog, nogc, extend
             add     sp, 20
             pop     {r4,r5,r11,lr}
             add     sp, 4
             bx      r3     // <unknown method>
             ; gcr arg pop 0
                        ;; size=10 bbWeight=1 PerfScore 4.00
-G_M49933_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, funclet prolog, nogc
-            ; gcrRegs -[r1-r2 r5]
+G_M49933_IG06:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, funclet prolog, nogc
+            ; gcrRegs -[r1-r2 r4]
             push    {r2,r3,r4,r5,r11,lr}
             add     r3, r11, 12
             str     r3, [sp]
                        ;; size=10 bbWeight=0 PerfScore 0.00
-G_M49933_IG10:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, isz
-            ldr     r0, [r11-0x14] // [V05 loc1]
+G_M49933_IG07:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byrefRegs=0000 {}, gcvars, byref, isz
+            ldr     r0, [r11-0x18] // [V05 loc1]
             cmp     r0, 0
-            bne     SHORT G_M49933_IG12
+            bne     SHORT G_M49933_IG09
+            ldr     r0, [r11-0x14] // [V00 TypeCtx]
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            ; gcr arg pop 0
             ldr     r0, [r11+0x08]  // [V13 tmp7]
             ; gcrRegs +[r0]
             ldr     r0, [r0+0x08]
@@ -123,12 +117,12 @@ G_M49933_IG10:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             movw    r3, 0xd1ff
             ; gcrRegs -[r3]
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_NEWSFAST
+            blx     r3        // CORINFO_HELP_NEWFAST_MAYBEFROZEN
             ; gcrRegs +[r0]
             ; gcr arg pop 0
             mov     r1, r0
             ; gcrRegs +[r1]
-            str     r1, [r11-0x18]    // [V12 tmp6]
+            str     r1, [r11-0x1C]   // [V12 tmp6]
             ; GC ptr vars +{V12}
             adds    r0, r1, 4
             ; gcrRegs -[r0]
@@ -141,7 +135,7 @@ G_M49933_IG10:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             ; byrRegs -[r0]
             add     r0, r5, 8
             ; byrRegs +[r0]
-            ldr     r1, [r11-0x18]    // [V12 tmp6]
+            ldr     r1, [r11-0x1C]   // [V12 tmp6]
             ; gcrRegs +[r1]
             movw    r12, 0xd1ff
             movt    r12, 0xd1ff
@@ -149,15 +143,15 @@ G_M49933_IG10:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=0000 {}, byref
             blx     r12        // CORINFO_HELP_ASSIGN_REF
             ; gcrRegs -[r1 r5]
             ; byrRegs -[r0]
-                      ;; size=82 bbWeight=0 PerfScore 0.00
-G_M49933_IG11:        ; bbWeight=0, funclet epilog, nogc, extend
+                     ;; size=104 bbWeight=0 PerfScore 0.00
+G_M49933_IG08:        ; bbWeight=0, funclet epilog, nogc, extend
             pop     {r2,r3,r4,r5,r11,pc}
                        ;; size=4 bbWeight=0 PerfScore 0.00
-G_M49933_IG12:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, funclet epilog, nogc
+G_M49933_IG09:        ; bbWeight=0, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, funclet epilog, nogc
             pop     {r2,r3,r4,r5,r11,pc}
                        ;; size=4 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 198, prolog size 22, PerfScore 34.00, instruction count 71, allocated bytes for code 198 (MethodHash=6b9d3cf2) for method Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvoke[System.__Canon,System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
+; Total bytes of code 210, prolog size 22, PerfScore 34.00, instruction count 72, allocated bytes for code 210 (MethodHash=6b9d3cf2) for method Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvoke[System.__Canon,System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -169,7 +163,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 49 (0x00031) Actual length = 98 (0x000062)
+  Function Length   : 44 (0x0002c) Actual length = 88 (0x000058)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -196,7 +190,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 50 (0x00032) Actual length = 100 (0x000064)
+  Function Length   : 61 (0x0003d) Actual length = 122 (0x00007a)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
@@ -214,4 +208,4 @@ Unwind Info:
 
 *************** EH table for Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvoke[System.__Canon,System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.AsyncReturn
 1 EH table entries, 0 duplicate clauses, 0 cloned finallys, 1 total EH entries reported to VM
-EH#0: try [G_M49933_IG03..G_M49933_IG04) handled by [G_M49933_IG09..END) (fault)
+EH#0: try [G_M49933_IG03..G_M49933_IG04) handled by [G_M49933_IG06..END) (fault)
+12 (+10.00%) : 6860.dasm - Internal.Utilities.Collections.QueueList:foldBack[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Internal.Utilities.Collections.QueueList`1[System.__Canon],System.__Canon):System.__Canon (FullOpts) 
@@ -7,110 +7,111 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->   r0         single-def
-;  V01 arg0         [V01,T01] (  4,  4   )     ref  ->   r4         class-hnd single-def <Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]>
-;  V02 arg1         [V02,T02] (  4,  4   )     ref  ->   r5         class-hnd single-def <Internal.Utilities.Collections.QueueList`1[System.__Canon]>
-;  V03 arg2         [V03,T05] (  3,  3   )     ref  ->   r6         class-hnd single-def <System.__Canon>
+;  V00 TypeCtx      [V00,T00] (  5,  5   )     int  ->   r4         single-def
+;  V01 arg0         [V01,T01] (  4,  4   )     ref  ->   r5         class-hnd single-def <Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]>
+;  V02 arg1         [V02,T02] (  4,  4   )     ref  ->   r6         class-hnd single-def <Internal.Utilities.Collections.QueueList`1[System.__Canon]>
+;  V03 arg2         [V03,T03] (  3,  3   )     ref  ->   r7         class-hnd single-def <System.__Canon>
 ;# V04 OutArgs      [V04    ] (  1,  1   )  struct ( 0) [sp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V05 tmp1         [V05,T07] (  2,  4   )     ref  ->   r7         class-hnd exact single-def "impAppendStmt" <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
-;* V06 tmp2         [V06,T11] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V05 tmp1         [V05,T04] (  2,  4   )     ref  ->   r8         class-hnd exact single-def "impAppendStmt" <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
+;  V06 tmp2         [V06,T07] (  2,  4   )     int  ->   r9         "spilling helperCall"
 ;* V07 tmp3         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V08 tmp4         [V08,T08] (  2,  4   )     ref  ->   r2         single-def "argument with side effect"
-;  V09 tmp5         [V09,T03] (  3,  6   )     int  ->   r8         "argument with side effect"
-;  V10 tmp6         [V10,T09] (  2,  4   )     ref  ->   r3         single-def "argument with side effect"
-;  V11 cse0         [V11,T10] (  2,  2   )     int  ->   r8         "CSE - aggressive"
-;  V12 rat0         [V12,T06] (  3,  4   )     int  ->   r8         "runtime lookup"
-;  V13 rat1         [V13,T04] (  3,  5.60)     int  ->   r8         "fgMakeTemp is creating a new local variable"
+;  V08 tmp4         [V08,T05] (  2,  4   )     ref  ->   r2         single-def "argument with side effect"
+;  V09 tmp5         [V09,T08] (  2,  4   )     int  ->   r4         "argument with side effect"
+;  V10 tmp6         [V10,T06] (  2,  4   )     ref  ->   r3         single-def "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 8
 
 G_M61677_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
-            push    {r4,r5,r6,r7,r8,r11,lr}
-            sub     sp, 12
+            push    {r2,r3,r4,r5,r6,r7,r8,r9,r11,lr}
             add     r11, sp, 32
             str     r0, [r11-0x1C]
-            mov     r4, r1
-            ; gcrRegs +[r4]
-            mov     r5, r2
+            mov     r4, r0
+            mov     r5, r1
             ; gcrRegs +[r5]
-            mov     r6, r3
+            mov     r6, r2
             ; gcrRegs +[r6]
-                     ;; size=20 bbWeight=1 PerfScore 7.00
-G_M61677_IG02:        ; bbWeight=1, gcrefRegs=0070 {r4 r5 r6}, byrefRegs=0000 {}, byref, isz
-            ldr     r7, [r5+0x04]
+            mov     r7, r3
             ; gcrRegs +[r7]
-            ldr     r1, [r0+0x20]
-            ldr     r8, [r1+0x0C]
-            cmp     r8, 0
-            beq     SHORT G_M61677_IG04
-                       ;; size=14 bbWeight=1 PerfScore 5.00
-G_M61677_IG03:        ; bbWeight=0.80, gcrefRegs=00F0 {r4 r5 r6 r7}, byrefRegs=0000 {}, byref, isz
-            b       SHORT G_M61677_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 0.80
-G_M61677_IG04:        ; bbWeight=0.20, gcrefRegs=00F0 {r4 r5 r6 r7}, byrefRegs=0000 {}, byref
+                        ;; size=20 bbWeight=1 PerfScore 7.00
+G_M61677_IG02:        ; bbWeight=1, gcrefRegs=00E0 {r5 r6 r7}, byrefRegs=0000 {}, byref
+            ldr     r8, [r6+0x04]
+            ; gcrRegs +[r8]
+            mov     r0, r4
             movw    r1, 0xd1ff
             movt    r1, 0xd1ff
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
-            blx     r3     // CORINFO_HELP_RUNTIMEHANDLE_METHOD
-            mov     r8, r0
-                       ;; size=20 bbWeight=0.20 PerfScore 1.20
-G_M61677_IG05:        ; bbWeight=1, gcrefRegs=00F0 {r4 r5 r6 r7}, byrefRegs=0000 {}, byref
-            mov     r0, r5
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r9, r0
+            mov     r0, r4
+            movw    r1, 0xd1ff
+            movt    r1, 0xd1ff
+            movw    r3, 0xd1ff
+            movt    r3, 0xd1ff
+            blx     r3     // CORINFO_HELP_MEMCPY
+            mov     r4, r0
+            mov     r0, r6
             ; gcrRegs +[r0]
             movw    r3, 0xd1ff
             movt    r3, 0xd1ff
             ldr     r3, [r3]
             blx     r3     // Internal.Utilities.Collections.QueueList`1[System.__Canon]:lastElements():Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]:this
-            ; gcrRegs -[r5]
+            ; gcrRegs -[r6]
             mov     r2, r0
             ; gcrRegs +[r2]
-            mov     r1, r4
+            mov     r1, r5
             ; gcrRegs +[r1]
-            mov     r0, r8
+            mov     r0, r9
             ; gcrRegs -[r0]
-            mov     r3, r6
+            mov     r3, r7
             ; gcrRegs +[r3]
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     lr, [lr]
             blx     lr     // <unknown method>
-            ; gcrRegs -[r1-r3 r6] +[r0]
+            ; gcrRegs -[r1-r3 r7] +[r0]
             mov     r3, r0
             ; gcrRegs +[r3]
-            mov     r0, r8
+            mov     r0, r4
             ; gcrRegs -[r0]
-            mov     r2, r7
+            mov     r2, r8
             ; gcrRegs +[r2]
-            mov     r1, r4
+            mov     r1, r5
             ; gcrRegs +[r1]
             movw    lr, 0xd1ff
             movt    lr, 0xd1ff
             ldr     r12, [lr]
-                        ;; size=56 bbWeight=1 PerfScore 20.00
-G_M61677_IG06:        ; bbWeight=1, epilog, nogc, extend
-            add     sp, 12
-            pop     {r4,r5,r6,r7,r8,r11,lr}
+                      ;; size=104 bbWeight=1 PerfScore 35.00
+G_M61677_IG03:        ; bbWeight=1, epilog, nogc, extend
+            add     sp, 8
+            pop     {r4,r5,r6,r7,r8,r9,r11,lr}
             bx      r12      // <unknown method>
                        ;; size=8 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 120, prolog size 14, PerfScore 37.00, instruction count 42, allocated bytes for code 120 (MethodHash=8d550f12) for method Internal.Utilities.Collections.QueueList:foldBack[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Internal.Utilities.Collections.QueueList`1[System.__Canon],System.__Canon):System.__Canon (FullOpts)
+; Total bytes of code 132, prolog size 12, PerfScore 45.00, instruction count 45, allocated bytes for code 132 (MethodHash=8d550f12) for method Internal.Utilities.Collections.QueueList:foldBack[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Internal.Utilities.Collections.QueueList`1[System.__Canon],System.__Canon):System.__Canon (FullOpts)
 ; ============================================================
 
 Unwind Info:
   >> Start offset   : 0x000000 (not in unwind data)
   >>   End offset   : 0xd1ffab1e (not in unwind data)
-  Code Words        : 1
-  Epilog Count      : 0
+  Code Words        : 2
+  Epilog Count      : 1
   F bit             : 0
-  E bit             : 1
+  E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 60 (0x0003c) Actual length = 120 (0x000078)
-  --- One epilog, unwind codes at 0
+  Function Length   : 66 (0x00042) Actual length = 132 (0x000084)
+  ---- Epilog scopes ----
+  ---- Scope 0
+  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
+  Condition                  : 14 (0xe) (always)
+  Epilog Start Index         : 3 (0x03)
   ---- Unwind codes ----
-    ---- Epilog start at index 0 ----
-    03          add sp, sp, #12                     ; opsize 16
-    A9 F0       pop {r4,r5,r6,r7,r8,r11,lr}         ; opsize 32
+    AB FC       pop {r2,r3,r4,r5,r6,r7,r8,r9,r11,lr}; opsize 32
+    FF          end
+    ---- Epilog start at index 3 ----
+    02          add sp, sp, #8                      ; opsize 16
+    AB F0       pop {r4,r5,r6,r7,r8,r9,r11,lr}      ; opsize 32
+    FF          end
     FF          end

Details

Improvements/regressions per collection

Collection Contexts with diffs Improvements Regressions Same size Improvements (bytes) Regressions (bytes)
benchmarks.run.linux.arm.checked.mch 982 67 4 911 -2,486 +58
benchmarks.run_pgo.linux.arm.checked.mch 2,747 426 3 2,318 -15,606 +30
benchmarks.run_tiered.linux.arm.checked.mch 3,497 247 4 3,246 -10,458 +58
coreclr_tests.run.linux.arm.checked.mch 111 1 0 110 -32 +0
libraries.crossgen2.linux.arm.checked.mch 0 0 0 0 -0 +0
libraries.pmi.linux.arm.checked.mch 2,624 291 10 2,323 -7,336 +1,006
libraries_tests.run.linux.arm.Release.mch 1,911 230 7 1,674 -9,958 +154
librariestestsnotieredcompilation.run.linux.arm.Release.mch 1,120 112 9 999 -4,168 +172
realworld.run.linux.arm.checked.mch 2,649 150 13 2,486 -5,184 +484
15,641 1,524 50 14,067 -55,228 +1,962

Context information

Collection Diffed contexts MinOpts FullOpts Missed, base Missed, diff
benchmarks.run.linux.arm.checked.mch 3,253 186 3,067 527 (8.01%) 2,927 (44.50%)
benchmarks.run_pgo.linux.arm.checked.mch 14,737 10,689 4,048 957 (4.19%) 7,701 (33.72%)
benchmarks.run_tiered.linux.arm.checked.mch 16,567 10,960 5,607 794 (3.52%) 5,597 (24.81%)
coreclr_tests.run.linux.arm.checked.mch 445 3 442 169 (7.45%) 1,428 (62.94%)
libraries.crossgen2.linux.arm.checked.mch 7,526 8 7,518 0 (0.00%) 2,904 (26.82%)
libraries.pmi.linux.arm.checked.mch 12,200 0 12,200 277 (1.63%) 4,363 (25.73%)
libraries_tests.run.linux.arm.Release.mch 7,602 6,621 981 277 (2.30%) 4,063 (33.69%)
librariestestsnotieredcompilation.run.linux.arm.Release.mch 3,195 0 3,195 565 (8.97%) 2,709 (42.99%)
realworld.run.linux.arm.checked.mch 5,313 57 5,256 509 (6.37%) 2,287 (28.60%)
70,838 28,524 42,314 4,075 (3.76%) 33,979 (31.35%)

jit-analyze output

benchmarks.run.linux.arm.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 416870 (overridden on cmd)
Total bytes of diff: 414442 (overridden on cmd)
Total bytes of delta: -2428 (-0.58 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          34 : 2076.dasm (17.00 % of base)
           8 : 1907.dasm (5.00 % of base)
           8 : 3988.dasm (3.92 % of base)
           8 : 6285.dasm (3.25 % of base)

Top file improvements (bytes):
        -206 : 3666.dasm (-21.37 % of base)
        -124 : 823.dasm (-27.19 % of base)
        -124 : 252.dasm (-25.62 % of base)
        -108 : 256.dasm (-21.26 % of base)
        -106 : 747.dasm (-17.97 % of base)
         -90 : 4479.dasm (-22.06 % of base)
         -86 : 6323.dasm (-28.10 % of base)
         -82 : 4296.dasm (-16.87 % of base)
         -80 : 3733.dasm (-22.60 % of base)
         -76 : 661.dasm (-16.96 % of base)
         -64 : 218.dasm (-20.13 % of base)
         -62 : 2992.dasm (-21.83 % of base)
         -54 : 3351.dasm (-16.77 % of base)
         -50 : 2893.dasm (-13.51 % of base)
         -46 : 2988.dasm (-14.56 % of base)
         -44 : 3984.dasm (-20.75 % of base)
         -42 : 255.dasm (-17.07 % of base)
         -42 : 4646.dasm (-20.59 % of base)
         -42 : 4691.dasm (-18.26 % of base)
         -36 : 103.dasm (-12.00 % of base)

37 total files with Code Size differences (33 improved, 4 regressed), 36 unchanged.

Top method regressions (bytes):
          34 (17.00 % of base) : 2076.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)
           8 (5.00 % of base) : 1907.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
           8 (3.92 % of base) : 3988.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (FullOpts)
           8 (3.25 % of base) : 6285.dasm - System.Text.Json.JsonSerializer:Deserialize[System.__Canon](System.ReadOnlySpan`1[ubyte],System.Text.Json.JsonSerializerOptions):System.__Canon (FullOpts)

Top method improvements (bytes):
        -206 (-21.37 % of base) : 3666.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -124 (-25.62 % of base) : 252.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -124 (-27.19 % of base) : 823.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -108 (-21.26 % of base) : 256.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -106 (-17.97 % of base) : 747.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -90 (-22.06 % of base) : 4479.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -86 (-28.10 % of base) : 6323.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -82 (-16.87 % of base) : 4296.dasm - System.Linq.Lookup`2[System.__Canon,System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]:Create[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]],System.Func`2[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon],System.__Canon],System.Func`2[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon],System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Linq.Lookup`2[System.__Canon,System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]] (FullOpts)
         -80 (-22.60 % of base) : 3733.dasm - System.Linq.Enumerable:ElementAt[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.__Canon (FullOpts)
         -76 (-16.96 % of base) : 661.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -64 (-20.13 % of base) : 218.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (FullOpts)
         -62 (-21.83 % of base) : 2992.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.IEnumerable,byref):ubyte (FullOpts)
         -54 (-16.77 % of base) : 3351.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (FullOpts)
         -50 (-13.51 % of base) : 2893.dasm - BenchmarkDotNet.Extensions.ValuesGenerator:ArrayOfUniqueValues[System.__Canon](int):System.__Canon[] (FullOpts)
         -46 (-14.56 % of base) : 2988.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]] (FullOpts)
         -44 (-20.75 % of base) : 3984.dasm - System.Linq.Enumerable:ToList[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.List`1[System.__Canon] (FullOpts)
         -42 (-17.07 % of base) : 255.dasm - System.Linq.Enumerable:SkipIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -42 (-20.59 % of base) : 4646.dasm - System.Linq.Enumerable:Take[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -42 (-18.26 % of base) : 4691.dasm - System.Text.Json.Serialization.Metadata.JsonMetadataServices:GetConverter[System.__Canon](System.Text.Json.Serialization.Metadata.JsonObjectInfoValues`1[System.__Canon]):System.Text.Json.Serialization.JsonConverter`1[System.__Canon] (FullOpts)
         -36 (-12.00 % of base) : 103.dasm - System.Array:Resize[System.__Canon](byref,int) (FullOpts)

Top method regressions (percentages):
          34 (17.00 % of base) : 2076.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)
           8 (5.00 % of base) : 1907.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
           8 (3.92 % of base) : 3988.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (FullOpts)
           8 (3.25 % of base) : 6285.dasm - System.Text.Json.JsonSerializer:Deserialize[System.__Canon](System.ReadOnlySpan`1[ubyte],System.Text.Json.JsonSerializerOptions):System.__Canon (FullOpts)

Top method improvements (percentages):
         -30 (-33.33 % of base) : 253.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
         -20 (-30.30 % of base) : 3661.dasm - System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start[System.Text.Json.Serialization.Tests.ReadJson`1+<Setup>d__5[System.__Canon]](byref):this (FullOpts)
         -22 (-28.95 % of base) : 4552.dasm - Utf8Json.JsonSerializer:Deserialize[System.__Canon](System.IO.Stream):System.__Canon (FullOpts)
         -28 (-28.57 % of base) : 4233.dasm - System.Threading.Tasks.TaskCache:CreateCacheableTask[System.__Canon](System.__Canon):System.Threading.Tasks.Task`1[System.__Canon] (FullOpts)
         -86 (-28.10 % of base) : 6323.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -22 (-27.50 % of base) : 2094.dasm - <PrivateImplementationDetails>:InlineArrayAsReadOnlySpan[System.Collections.Generic.SegmentedArrayBuilder`1+Arrays[System.ValueTuple`2[System.__Canon,System.__Canon]],System.__Canon](byref,int):System.ReadOnlySpan`1[System.__Canon] (FullOpts)
         -22 (-27.50 % of base) : 2077.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.ValueTuple`2[System.__Canon,System.__Canon]],System.ValueTuple`2[System.__Canon,System.__Canon]](byref,int):System.Span`1[System.ValueTuple`2[System.__Canon,System.__Canon]] (FullOpts)
         -22 (-27.50 % of base) : 2896.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -124 (-27.19 % of base) : 823.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
         -26 (-27.08 % of base) : 842.dasm - System.Linq.Enumerable:HashSetToArray[System.__Canon](System.Collections.Generic.HashSet`1[System.__Canon]):System.__Canon[] (FullOpts)
         -18 (-26.47 % of base) : 2991.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]],byref):ubyte (FullOpts)
        -124 (-25.62 % of base) : 252.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -28 (-23.33 % of base) : 2075.dasm - System.Linq.Enumerable:ZipIterator[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]] (FullOpts)
         -20 (-22.73 % of base) : 4958.dasm - System.SZArrayHelper:Contains[System.__Canon](System.__Canon):ubyte:this (FullOpts)
         -80 (-22.60 % of base) : 3733.dasm - System.Linq.Enumerable:ElementAt[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.__Canon (FullOpts)
         -90 (-22.06 % of base) : 4479.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -62 (-21.83 % of base) : 2992.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.IEnumerable,byref):ubyte (FullOpts)
         -26 (-21.67 % of base) : 3668.dasm - System.Text.Json.JsonSerializer:Serialize[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):System.String (FullOpts)
         -26 (-21.67 % of base) : 6638.dasm - System.Text.Json.JsonSerializer:SerializeToUtf8Bytes[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):ubyte[] (FullOpts)
        -206 (-21.37 % of base) : 3666.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)

benchmarks.run_pgo.linux.arm.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 1814364 (overridden on cmd)
Total bytes of diff: 1798788 (overridden on cmd)
Total bytes of delta: -15576 (-0.86 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          10 : 20173.dasm (5.05 % of base)
          10 : 23083.dasm (5.05 % of base)
          10 : 21951.dasm (5.05 % of base)

Top file improvements (bytes):
        -232 : 2518.dasm (-37.18 % of base)
        -230 : 657.dasm (-35.28 % of base)
        -206 : 6115.dasm (-21.24 % of base)
        -202 : 663.dasm (-30.51 % of base)
        -200 : 2296.dasm (-30.21 % of base)
        -200 : 11485.dasm (-27.93 % of base)
        -190 : 8949.dasm (-17.09 % of base)
        -172 : 13169.dasm (-32.33 % of base)
        -170 : 8947.dasm (-31.72 % of base)
        -162 : 12734.dasm (-31.89 % of base)
        -140 : 6159.dasm (-32.56 % of base)
        -140 : 2060.dasm (-23.57 % of base)
        -140 : 9297.dasm (-30.17 % of base)
        -130 : 262.dasm (-26.21 % of base)
        -124 : 11906.dasm (-27.19 % of base)
        -124 : 18863.dasm (-27.19 % of base)
        -124 : 11628.dasm (-27.31 % of base)
        -124 : 9321.dasm (-27.31 % of base)
        -112 : 13103.dasm (-25.57 % of base)
        -110 : 13241.dasm (-21.83 % of base)

35 total files with Code Size differences (32 improved, 3 regressed), 37 unchanged.

Top method regressions (bytes):
          10 (5.05 % of base) : 20173.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
          10 (5.05 % of base) : 23083.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
          10 (5.05 % of base) : 21951.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)

Top method improvements (bytes):
        -232 (-37.18 % of base) : 2518.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -230 (-35.28 % of base) : 657.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -206 (-21.24 % of base) : 6115.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -202 (-30.51 % of base) : 663.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -200 (-27.93 % of base) : 11485.dasm - System.Array:Sort[System.__Canon,System.__Canon](System.__Canon[],System.__Canon[],int,int,System.Collections.Generic.IComparer`1[System.__Canon]) (Tier0)
        -200 (-30.21 % of base) : 2296.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -190 (-17.09 % of base) : 8949.dasm - System.SpanHelpers:SequenceEqual[System.__Canon](byref,byref,int):ubyte (Tier0-FullOpts)
        -172 (-32.33 % of base) : 13169.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -170 (-31.72 % of base) : 8947.dasm - System.MemoryExtensions:SequenceEqual[System.__Canon](System.Span`1[System.__Canon],System.ReadOnlySpan`1[System.__Canon]):ubyte (Tier0)
        -162 (-31.89 % of base) : 12734.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -140 (-32.56 % of base) : 6159.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]] (Tier0)
        -140 (-30.17 % of base) : 9297.dasm - System.Linq.Enumerable:ElementAt[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.__Canon (Tier0)
        -140 (-23.57 % of base) : 2060.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -130 (-26.21 % of base) : 262.dasm - System.Array:Resize[System.__Canon](byref,int) (Tier0)
        -124 (-27.19 % of base) : 11906.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -124 (-27.19 % of base) : 18863.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -124 (-27.31 % of base) : 11628.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -124 (-27.31 % of base) : 9321.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -112 (-25.57 % of base) : 13103.dasm - System.Array:Sort[System.__Canon](System.__Canon[],int,int,System.Collections.Generic.IComparer`1[System.__Canon]) (Tier0)
        -110 (-21.83 % of base) : 13241.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier1)

Top method regressions (percentages):
          10 (5.05 % of base) : 20173.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
          10 (5.05 % of base) : 23083.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
          10 (5.05 % of base) : 21951.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)

Top method improvements (percentages):
         -26 (-38.24 % of base) : 13590.dasm - System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
        -232 (-37.18 % of base) : 2518.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -230 (-35.28 % of base) : 657.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -30 (-34.09 % of base) : 17433.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
         -30 (-34.09 % of base) : 11901.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
         -30 (-34.09 % of base) : 16247.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
         -30 (-34.09 % of base) : 17052.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
         -80 (-33.33 % of base) : 17413.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon):ubyte (Tier0)
        -140 (-32.56 % of base) : 6159.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]] (Tier0)
        -172 (-32.33 % of base) : 13169.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -162 (-31.89 % of base) : 12734.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -170 (-31.72 % of base) : 8947.dasm - System.MemoryExtensions:SequenceEqual[System.__Canon](System.Span`1[System.__Canon],System.ReadOnlySpan`1[System.__Canon]):ubyte (Tier0)
         -50 (-31.65 % of base) : 4920.dasm - System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (Instrumented Tier0)
         -50 (-31.65 % of base) : 4381.dasm - System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (Tier0)
         -50 (-31.25 % of base) : 8158.dasm - System.Text.Json.JsonSerializer:Serialize[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):System.String (Tier0)
         -50 (-31.25 % of base) : 6374.dasm - System.Text.Json.JsonSerializer:SerializeToUtf8Bytes[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):ubyte[] (Tier0)
        -202 (-30.51 % of base) : 663.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
         -50 (-30.49 % of base) : 20300.dasm - System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[System.__Canon]:AwaitUnsafeOnCompleted[System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[System.__Canon],System.Threading.Tasks.TaskCompletionSourceWithCancellation`1+<WaitWithCancellationAsync>d__1[System.__Canon]](byref,byref,byref) (Tier0)
         -80 (-30.30 % of base) : 17042.dasm - System.Linq.Enumerable:Take[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -200 (-30.21 % of base) : 2296.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)

benchmarks.run_tiered.linux.arm.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 1798372 (overridden on cmd)
Total bytes of diff: 1787972 (overridden on cmd)
Total bytes of delta: -10400 (-0.58 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          34 : 16790.dasm (17.00 % of base)
           8 : 14315.dasm (3.92 % of base)
           8 : 4206.dasm (5.00 % of base)
           8 : 12133.dasm (7.27 % of base)

Top file improvements (bytes):
        -232 : 2269.dasm (-37.18 % of base)
        -230 : 610.dasm (-35.28 % of base)
        -206 : 7626.dasm (-21.37 % of base)
        -202 : 616.dasm (-30.51 % of base)
        -200 : 2067.dasm (-30.30 % of base)
        -190 : 11477.dasm (-17.15 % of base)
        -172 : 4048.dasm (-32.33 % of base)
        -170 : 11475.dasm (-31.72 % of base)
        -162 : 13169.dasm (-31.89 % of base)
        -140 : 16677.dasm (-34.31 % of base)
        -140 : 1831.dasm (-23.57 % of base)
        -140 : 7522.dasm (-32.41 % of base)
        -130 : 251.dasm (-26.21 % of base)
        -124 : 16383.dasm (-25.62 % of base)
        -124 : 2928.dasm (-27.19 % of base)
        -112 : 3908.dasm (-25.57 % of base)
        -110 : 12882.dasm (-27.64 % of base)
        -110 : 15030.dasm (-28.06 % of base)
        -110 : 11345.dasm (-20.00 % of base)
        -110 : 532.dasm (-25.70 % of base)

36 total files with Code Size differences (32 improved, 4 regressed), 36 unchanged.

Top method regressions (bytes):
          34 (17.00 % of base) : 16790.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
           8 (5.00 % of base) : 4206.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
           8 (3.92 % of base) : 14315.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (Tier1)
           8 (7.27 % of base) : 12133.dasm - System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)

Top method improvements (bytes):
        -232 (-37.18 % of base) : 2269.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -230 (-35.28 % of base) : 610.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -206 (-21.37 % of base) : 7626.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -202 (-30.51 % of base) : 616.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -200 (-30.30 % of base) : 2067.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -190 (-17.15 % of base) : 11477.dasm - System.SpanHelpers:SequenceEqual[System.__Canon](byref,byref,int):ubyte (Tier0-FullOpts)
        -172 (-32.33 % of base) : 4048.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -170 (-31.72 % of base) : 11475.dasm - System.MemoryExtensions:SequenceEqual[System.__Canon](System.Span`1[System.__Canon],System.ReadOnlySpan`1[System.__Canon]):ubyte (Tier0)
        -162 (-31.89 % of base) : 13169.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -140 (-32.41 % of base) : 7522.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Immutable.IOrderedCollection`1[System.__Canon] (Tier0)
        -140 (-34.31 % of base) : 16677.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -140 (-23.57 % of base) : 1831.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -130 (-26.21 % of base) : 251.dasm - System.Array:Resize[System.__Canon](byref,int) (Tier0)
        -124 (-25.62 % of base) : 16383.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier1)
        -124 (-27.19 % of base) : 2928.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -112 (-25.57 % of base) : 3908.dasm - System.Array:Sort[System.__Canon](System.__Canon[],int,int,System.Collections.Generic.IComparer`1[System.__Canon]) (Tier0)
        -110 (-27.64 % of base) : 12882.dasm - ProtoBuf.ProtoReader+State:ReadAsRoot[System.__Canon](System.__Canon,ProtoBuf.Serializers.ISerializer`1[System.__Canon]):System.__Canon:this (Tier0)
        -110 (-20.00 % of base) : 11345.dasm - System.Array:Sort[uint,System.__Canon](uint[],System.__Canon[],int,int,System.Collections.Generic.IComparer`1[uint]) (Tier0)
        -110 (-28.06 % of base) : 15030.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.IEnumerable,byref):ubyte (Tier0)
        -110 (-25.70 % of base) : 532.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (Tier0)

Top method regressions (percentages):
          34 (17.00 % of base) : 16790.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
           8 (7.27 % of base) : 12133.dasm - System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)
           8 (5.00 % of base) : 4206.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
           8 (3.92 % of base) : 14315.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (Tier1)

Top method improvements (percentages):
         -26 (-38.24 % of base) : 15817.dasm - System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
        -232 (-37.18 % of base) : 2269.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -230 (-35.28 % of base) : 610.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -140 (-34.31 % of base) : 16677.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
         -30 (-34.09 % of base) : 2710.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
         -22 (-33.33 % of base) : 2931.dasm - BenchmarkDotNet.Characteristics.CharacteristicObject`1[System.__Canon]:CreateCharacteristic[ubyte](System.String):BenchmarkDotNet.Characteristics.Characteristic`1[ubyte] (Tier1)
         -22 (-33.33 % of base) : 16775.dasm - Newtonsoft.Json.Serialization.JsonTypeReflector:GetCachedAttribute[System.__Canon](System.Object):System.__Canon (Tier1)
         -80 (-33.33 % of base) : 4141.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon):ubyte (Tier0)
        -140 (-32.41 % of base) : 7522.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Immutable.IOrderedCollection`1[System.__Canon] (Tier0)
         -22 (-32.35 % of base) : 2964.dasm - System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier1)
        -172 (-32.33 % of base) : 4048.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -50 (-32.05 % of base) : 11799.dasm - ProtoBuf.Meta.RuntimeTypeModel:GetSerializer[System.__Canon]():ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (Tier0)
        -162 (-31.89 % of base) : 13169.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -170 (-31.72 % of base) : 11475.dasm - System.MemoryExtensions:SequenceEqual[System.__Canon](System.Span`1[System.__Canon],System.ReadOnlySpan`1[System.__Canon]):ubyte (Tier0)
         -50 (-31.65 % of base) : 12564.dasm - ProtoBuf.Meta.RuntimeTypeModel:GetSerializerCore[System.__Canon](int):ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (Tier0)
         -50 (-31.65 % of base) : 11643.dasm - System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (Tier0)
         -50 (-31.25 % of base) : 5322.dasm - System.Text.Json.JsonSerializer:Serialize[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):System.String (Tier0)
         -50 (-31.25 % of base) : 6481.dasm - System.Text.Json.JsonSerializer:SerializeToUtf8Bytes[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):ubyte[] (Tier0)
         -22 (-30.56 % of base) : 4225.dasm - System.Collections.Immutable.ImmutableDictionary:ToImmutableDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]):System.Collections.Immutable.ImmutableDictionary`2[System.__Canon,System.__Canon] (Tier1)
        -202 (-30.51 % of base) : 616.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)

coreclr_tests.run.linux.arm.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 84084 (overridden on cmd)
Total bytes of diff: 84052 (overridden on cmd)
Total bytes of delta: -32 (-0.04 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file improvements (bytes):
         -32 : 86.dasm (-10.60 % of base)

1 total files with Code Size differences (1 improved, 0 regressed), 52 unchanged.

Top method improvements (bytes):
         -32 (-10.60 % of base) : 86.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte],byref):System.__Canon (FullOpts)

Top method improvements (percentages):
         -32 (-10.60 % of base) : 86.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte],byref):System.__Canon (FullOpts)

libraries.pmi.linux.arm.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 926186 (overridden on cmd)
Total bytes of diff: 919856 (overridden on cmd)
Total bytes of delta: -6330 (-0.68 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
         804 : 6434.dasm (152.85 % of base)
          54 : 4185.dasm (29.03 % of base)
          50 : 4173.dasm (21.19 % of base)
          24 : 8062.dasm (10.26 % of base)
          24 : 8065.dasm (7.41 % of base)
          14 : 15819.dasm (6.80 % of base)
          14 : 4139.dasm (10.29 % of base)
          12 : 15824.dasm (3.16 % of base)
           6 : 12657.dasm (6.00 % of base)
           4 : 12669.dasm (1.92 % of base)

Top file improvements (bytes):
         -78 : 11840.dasm (-22.16 % of base)
         -74 : 15878.dasm (-20.67 % of base)
         -70 : 4135.dasm (-25.18 % of base)
         -70 : 12932.dasm (-15.22 % of base)
         -70 : 4346.dasm (-25.18 % of base)
         -64 : 12930.dasm (-21.19 % of base)
         -64 : 12934.dasm (-21.19 % of base)
         -62 : 11832.dasm (-24.03 % of base)
         -62 : 11835.dasm (-23.48 % of base)
         -62 : 11833.dasm (-19.87 % of base)
         -60 : 11829.dasm (-23.44 % of base)
         -60 : 11830.dasm (-23.44 % of base)
         -60 : 11828.dasm (-23.44 % of base)
         -60 : 11831.dasm (-23.44 % of base)
         -58 : 13129.dasm (-21.32 % of base)
         -58 : 13183.dasm (-21.32 % of base)
         -58 : 13187.dasm (-21.32 % of base)
         -58 : 15848.dasm (-15.26 % of base)
         -54 : 12936.dasm (-15.17 % of base)
         -50 : 11565.dasm (-22.52 % of base)

50 total files with Code Size differences (40 improved, 10 regressed), 30 unchanged.

Top method regressions (bytes):
         804 (152.85 % of base) : 6434.dasm - System.Text.Unicode.TextSegmentationUtility:GetLengthOfFirstExtendedGraphemeCluster[System.__Canon](System.ReadOnlySpan`1[System.__Canon],System.Text.Unicode.TextSegmentationUtility+DecodeFirstRune`1[System.__Canon]):int (FullOpts)
          54 (29.03 % of base) : 4185.dasm - System.Numerics.Vector:CreateSequence[System.__Canon](System.__Canon,System.__Canon):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          50 (21.19 % of base) : 4173.dasm - System.Numerics.Vector:ConditionalSelect[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          24 (7.41 % of base) : 8065.dasm - System.Runtime.InteropServices.Marshal:CopyToManaged[System.__Canon](int,System.__Canon[],int,int) (FullOpts)
          24 (10.26 % of base) : 8062.dasm - System.Runtime.InteropServices.Marshal:CopyToNative[System.__Canon](System.__Canon[],int,int,int) (FullOpts)
          14 (6.80 % of base) : 15819.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvoke[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.Nullable`1[int],Microsoft.FSharp.Core.FSharpFunc`2[System.Nullable`1[int],System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
          14 (10.29 % of base) : 4139.dasm - System.Numerics.Vector:AndNot[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          12 (3.16 % of base) : 15824.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallFilterThenInvoke[System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.Runtime.ExceptionServices.ExceptionDispatchInfo):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
           6 (6.00 % of base) : 12657.dasm - Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]:WithContinuation[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]:this (FullOpts)
           4 (1.92 % of base) : 12669.dasm - Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]:HijackCheckThenCall[System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon):Microsoft.FSharp.Control.AsyncReturn (FullOpts)

Top method improvements (bytes):
         -78 (-22.16 % of base) : 11840.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Map[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:this (FullOpts)
         -74 (-20.67 % of base) : 15878.dasm - Microsoft.FSharp.Control.AsyncPrimitives:StartAsTask[System.__Canon](System.Threading.CancellationToken,Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon],Microsoft.FSharp.Core.FSharpOption`1[int]):System.Threading.Tasks.Task`1[System.__Canon] (FullOpts)
         -70 (-15.22 % of base) : 12932.dasm - Microsoft.FSharp.Control.TaskBuilderBase:For[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IEnumerable`1[System.__Canon],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[Microsoft.FSharp.Control.TaskStateMachineData`1[System.Nullable`1[int]],Microsoft.FSharp.Core.Unit]:this (FullOpts)
         -70 (-25.18 % of base) : 4135.dasm - System.Numerics.Vector:Abs[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -70 (-25.18 % of base) : 4346.dasm - System.Numerics.Vector:SquareRoot[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -64 (-21.19 % of base) : 12930.dasm - Microsoft.FSharp.Control.TaskBuilderBase:TryFinally[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[Microsoft.FSharp.Control.TaskStateMachineData`1[System.__Canon],System.Nullable`1[int]],Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Core.Unit,Microsoft.FSharp.Core.Unit]):Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[Microsoft.FSharp.Control.TaskStateMachineData`1[System.__Canon],System.Nullable`1[int]]:this (FullOpts)
         -64 (-21.19 % of base) : 12934.dasm - Microsoft.FSharp.Control.TaskBuilderBase:TryFinallyAsync[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[Microsoft.FSharp.Control.TaskStateMachineData`1[System.__Canon],System.Nullable`1[int]],Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Core.Unit,System.Threading.Tasks.ValueTask]):Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[Microsoft.FSharp.Control.TaskStateMachineData`1[System.__Canon],System.Nullable`1[int]]:this (FullOpts)
         -62 (-24.03 % of base) : 11832.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Fold[double](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],double):double:this (FullOpts)
         -62 (-23.48 % of base) : 11835.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Fold[long](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],long):long:this (FullOpts)
         -62 (-19.87 % of base) : 11833.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Fold[System.Numerics.Vector`1[float]](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.Numerics.Vector`1[float]):System.Numerics.Vector`1[float]:this (FullOpts)
         -60 (-23.44 % of base) : 11831.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Fold[int](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],int):int:this (FullOpts)
         -60 (-23.44 % of base) : 11830.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Fold[short](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],short):short:this (FullOpts)
         -60 (-23.44 % of base) : 11828.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Fold[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon):System.__Canon:this (FullOpts)
         -60 (-23.44 % of base) : 11829.dasm - Microsoft.FSharp.Collections.FSharpSet`1[System.__Canon]:Fold[ubyte](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],ubyte):ubyte:this (FullOpts)
         -58 (-15.26 % of base) : 15848.dasm - Microsoft.FSharp.Control.AsyncPrimitives:DelimitSyncContext[System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]):Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon] (FullOpts)
         -58 (-21.32 % of base) : 13183.dasm - Microsoft.FSharp.Linq.QueryBuilder:SkipWhile[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Linq.QuerySource`2[System.__Canon,System.Nullable`1[int]],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,ubyte]):Microsoft.FSharp.Linq.QuerySource`2[System.__Canon,System.Nullable`1[int]]:this (FullOpts)
         -58 (-21.32 % of base) : 13187.dasm - Microsoft.FSharp.Linq.QueryBuilder:TakeWhile[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Linq.QuerySource`2[System.__Canon,System.Nullable`1[int]],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,ubyte]):Microsoft.FSharp.Linq.QuerySource`2[System.__Canon,System.Nullable`1[int]]:this (FullOpts)
         -58 (-21.32 % of base) : 13129.dasm - Microsoft.FSharp.Linq.QueryBuilder:Where[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Linq.QuerySource`2[System.__Canon,System.Nullable`1[int]],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,ubyte]):Microsoft.FSharp.Linq.QuerySource`2[System.__Canon,System.Nullable`1[int]]:this (FullOpts)
         -54 (-15.17 % of base) : 12936.dasm - Microsoft.FSharp.Control.TaskBuilder:RunDynamic[System.__Canon](Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[Microsoft.FSharp.Control.TaskStateMachineData`1[System.__Canon],System.__Canon]):System.Threading.Tasks.Task`1[System.__Canon] (FullOpts)
         -50 (-22.52 % of base) : 11565.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:Map[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.__Canon]:this (FullOpts)

Top method regressions (percentages):
         804 (152.85 % of base) : 6434.dasm - System.Text.Unicode.TextSegmentationUtility:GetLengthOfFirstExtendedGraphemeCluster[System.__Canon](System.ReadOnlySpan`1[System.__Canon],System.Text.Unicode.TextSegmentationUtility+DecodeFirstRune`1[System.__Canon]):int (FullOpts)
          54 (29.03 % of base) : 4185.dasm - System.Numerics.Vector:CreateSequence[System.__Canon](System.__Canon,System.__Canon):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          50 (21.19 % of base) : 4173.dasm - System.Numerics.Vector:ConditionalSelect[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          14 (10.29 % of base) : 4139.dasm - System.Numerics.Vector:AndNot[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          24 (10.26 % of base) : 8062.dasm - System.Runtime.InteropServices.Marshal:CopyToNative[System.__Canon](System.__Canon[],int,int,int) (FullOpts)
          24 (7.41 % of base) : 8065.dasm - System.Runtime.InteropServices.Marshal:CopyToManaged[System.__Canon](int,System.__Canon[],int,int) (FullOpts)
          14 (6.80 % of base) : 15819.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvoke[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.Nullable`1[int],Microsoft.FSharp.Core.FSharpFunc`2[System.Nullable`1[int],System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
           6 (6.00 % of base) : 12657.dasm - Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]:WithContinuation[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]:this (FullOpts)
          12 (3.16 % of base) : 15824.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallFilterThenInvoke[System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.Runtime.ExceptionServices.ExceptionDispatchInfo):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
           4 (1.92 % of base) : 12669.dasm - Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]:HijackCheckThenCall[System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon):Microsoft.FSharp.Control.AsyncReturn (FullOpts)

Top method improvements (percentages):
         -28 (-34.15 % of base) : 15826.dasm - Microsoft.FSharp.Control.AsyncPrimitives:MakeAsync[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)
         -28 (-34.15 % of base) : 15231.dasm - Microsoft.FSharp.Control.ObservableModule:Pairwise[System.__Canon](System.IObservable`1[System.__Canon]):System.IObservable`1[System.__Canon] (FullOpts)
         -28 (-34.15 % of base) : 11120.dasm - Microsoft.FSharp.Core.FuncConvert:FromAction[System.__Canon,System.Nullable`1[int]](System.Action`2[System.__Canon,System.Nullable`1[int]]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
         -28 (-34.15 % of base) : 11118.dasm - Microsoft.FSharp.Core.FuncConvert:FromAction[System.__Canon](System.Action`1[System.__Canon]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
         -28 (-34.15 % of base) : 11115.dasm - Microsoft.FSharp.Core.FuncConvert:FromFunc[System.__Canon,System.Nullable`1[int]](System.Func`2[System.__Canon,System.Nullable`1[int]]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
         -28 (-34.15 % of base) : 11113.dasm - Microsoft.FSharp.Core.FuncConvert:FromFunc[System.__Canon](System.Func`1[System.__Canon]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
         -28 (-34.15 % of base) : 11109.dasm - Microsoft.FSharp.Core.FuncConvert:ToFSharpFunc[System.__Canon,System.Nullable`1[int]](System.Converter`2[System.__Canon,System.Nullable`1[int]]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
         -28 (-34.15 % of base) : 11111.dasm - Microsoft.FSharp.Core.FuncConvert:ToFSharpFunc[System.__Canon,System.Nullable`1[int]](System.Func`2[System.__Canon,System.Nullable`1[int]]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
         -28 (-34.15 % of base) : 11107.dasm - Microsoft.FSharp.Core.FuncConvert:ToFSharpFunc[System.__Canon](System.Action`1[System.__Canon]):Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon] (FullOpts)
         -22 (-33.33 % of base) : 13250.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:CreateDictionary[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IDictionary`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
         -22 (-33.33 % of base) : 13254.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:PrintFormatToString[System.__Canon](Microsoft.FSharp.Core.PrintfFormat`4[System.__Canon,System.__Canon,System.__Canon,System.__Canon]):System.__Canon (FullOpts)
         -22 (-33.33 % of base) : 13261.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:PrintFormatToStringThenFail[System.__Canon,System.Nullable`1[int]](Microsoft.FSharp.Core.PrintfFormat`4[System.__Canon,System.__Canon,System.__Canon,System.Nullable`1[int]]):System.__Canon (FullOpts)
         -22 (-33.33 % of base) : 13339.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:ToByte[System.__Canon](System.__Canon):ubyte (FullOpts)
         -22 (-33.33 % of base) : 13325.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:ToDouble[System.__Canon](System.__Canon):double (FullOpts)
         -22 (-33.33 % of base) : 13353.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:ToSByte[System.__Canon](System.__Canon):byte (FullOpts)
         -22 (-33.33 % of base) : 13311.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:ToSingle[System.__Canon](System.__Canon):float (FullOpts)
         -22 (-33.33 % of base) : 13417.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators+Checked:ToByte[System.__Canon](System.__Canon):ubyte (FullOpts)
         -22 (-33.33 % of base) : 13424.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators+Checked:ToSByte[System.__Canon](System.__Canon):byte (FullOpts)
         -22 (-33.33 % of base) : 12521.dasm - Microsoft.FSharp.Quotations.FSharpExpr:Cast[System.__Canon](Microsoft.FSharp.Quotations.FSharpExpr):Microsoft.FSharp.Quotations.FSharpExpr`1[System.__Canon] (FullOpts)
         -22 (-32.35 % of base) : 12862.dasm - Microsoft.FSharp.Control.FSharpAsync:Parallel[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)

libraries_tests.run.linux.arm.Release.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 836994 (overridden on cmd)
Total bytes of diff: 827190 (overridden on cmd)
Total bytes of delta: -9804 (-1.17 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          68 : 8759.dasm (7.94 % of base)
          40 : 6363.dasm (14.49 % of base)
          34 : 1964.dasm (17.00 % of base)
           4 : 4411.dasm (2.06 % of base)
           4 : 828.dasm (2.06 % of base)
           2 : 1115.dasm (1.72 % of base)
           2 : 4431.dasm (1.72 % of base)

Top file improvements (bytes):
        -232 : 43.dasm (-36.94 % of base)
        -230 : 34.dasm (-35.17 % of base)
        -206 : 6903.dasm (-21.68 % of base)
        -202 : 1515.dasm (-30.51 % of base)
        -200 : 184.dasm (-30.21 % of base)
        -200 : 2630.dasm (-19.88 % of base)
        -162 : 2318.dasm (-31.89 % of base)
        -140 : 191.dasm (-34.31 % of base)
        -140 : 2956.dasm (-35.90 % of base)
        -140 : 4949.dasm (-32.56 % of base)
        -140 : 507.dasm (-34.31 % of base)
        -140 : 1547.dasm (-23.57 % of base)
        -130 : 6193.dasm (-26.21 % of base)
        -124 : 965.dasm (-27.31 % of base)
        -110 : 1813.dasm (-26.07 % of base)
        -110 : 4414.dasm (-17.57 % of base)
        -110 : 4724.dasm (-28.21 % of base)
        -110 : 914.dasm (-17.57 % of base)
        -108 : 10665.dasm (-21.69 % of base)
        -108 : 2086.dasm (-18.18 % of base)

40 total files with Code Size differences (33 improved, 7 regressed), 33 unchanged.

Top method regressions (bytes):
          68 (7.94 % of base) : 8759.dasm - Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser:ParseCommaSeparatedSyntaxList[System.__Canon](byref,ushort,System.Func`2[Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser,ubyte],System.Func`2[System.__Canon,System.__Canon],Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser+SkipBadTokens`1[System.__Canon],ubyte,ubyte,ubyte):Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (Tier0-FullOpts)
          40 (14.49 % of base) : 6363.dasm - System.Threading.Tasks.Dataflow.Internal.Common:ReleaseAllPostponedMessages[System.__Canon](System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon],System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader],byref) (Tier0-FullOpts)
          34 (17.00 % of base) : 1964.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
           4 (2.06 % of base) : 4411.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
           4 (2.06 % of base) : 828.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
           2 (1.72 % of base) : 1115.dasm - System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)
           2 (1.72 % of base) : 4431.dasm - System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)

Top method improvements (bytes):
        -232 (-36.94 % of base) : 43.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -230 (-35.17 % of base) : 34.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -206 (-21.68 % of base) : 6903.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -202 (-30.51 % of base) : 1515.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -200 (-19.88 % of base) : 2630.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -200 (-30.21 % of base) : 184.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -162 (-31.89 % of base) : 2318.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -140 (-32.56 % of base) : 4949.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.ValueTuple`3[int,int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`3[int,int,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.ValueTuple`3[int,int,System.__Canon]] (Tier0)
        -140 (-34.31 % of base) : 507.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Instrumented Tier0)
        -140 (-34.31 % of base) : 191.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -140 (-23.57 % of base) : 1547.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -140 (-35.90 % of base) : 2956.dasm - Xunit.Assert:Contains[System.__Canon](System.__Canon,System.Collections.Generic.IEnumerable`1[System.__Canon]) (Tier0)
        -130 (-26.21 % of base) : 6193.dasm - System.Array:Resize[System.Collections.Immutable.RefAsValueType`1[System.__Canon]](byref,int) (Tier0)
        -124 (-27.31 % of base) : 965.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -110 (-28.21 % of base) : 4724.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.IEnumerable,byref):ubyte (Tier0)
        -110 (-26.07 % of base) : 1813.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (Tier0)
        -110 (-17.57 % of base) : 4414.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier1)
        -110 (-17.57 % of base) : 914.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier1)
        -108 (-18.18 % of base) : 2086.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon,System.Collections.Generic.IEqualityComparer`1[System.__Canon]):ubyte (Tier0-FullOpts)
        -108 (-21.69 % of base) : 10665.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier1)

Top method regressions (percentages):
          34 (17.00 % of base) : 1964.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
          40 (14.49 % of base) : 6363.dasm - System.Threading.Tasks.Dataflow.Internal.Common:ReleaseAllPostponedMessages[System.__Canon](System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon],System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader],byref) (Tier0-FullOpts)
          68 (7.94 % of base) : 8759.dasm - Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser:ParseCommaSeparatedSyntaxList[System.__Canon](byref,ushort,System.Func`2[Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser,ubyte],System.Func`2[System.__Canon,System.__Canon],Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser+SkipBadTokens`1[System.__Canon],ubyte,ubyte,ubyte):Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (Tier0-FullOpts)
           4 (2.06 % of base) : 4411.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
           4 (2.06 % of base) : 828.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
           2 (1.72 % of base) : 1115.dasm - System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)
           2 (1.72 % of base) : 4431.dasm - System.RuntimeType+RuntimeTypeCache:GetMemberCache[System.__Canon](byref):System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:this (Tier1)

Top method improvements (percentages):
         -26 (-38.24 % of base) : 10612.dasm - System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier1)
        -232 (-36.94 % of base) : 43.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
         -26 (-36.11 % of base) : 7272.dasm - System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start[System.__Canon](byref):this (Instrumented Tier1)
        -140 (-35.90 % of base) : 2956.dasm - Xunit.Assert:Contains[System.__Canon](System.__Canon,System.Collections.Generic.IEnumerable`1[System.__Canon]) (Tier0)
        -230 (-35.17 % of base) : 34.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -140 (-34.31 % of base) : 507.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Instrumented Tier0)
        -140 (-34.31 % of base) : 191.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
         -80 (-34.19 % of base) : 7449.dasm - Microsoft.CodeAnalysis.PublicContract:ToBoxedImmutableArrayWithDistinctNonNullItems[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.String):System.Collections.Generic.IReadOnlyList`1[System.__Canon] (Tier0)
         -80 (-34.19 % of base) : 6508.dasm - System.Collections.Immutable.ImmutableHashSet:Create[System.__Canon](System.__Canon[]):System.Collections.Immutable.ImmutableHashSet`1[System.__Canon] (Tier0)
         -30 (-34.09 % of base) : 2551.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
         -30 (-34.09 % of base) : 4606.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (Tier1)
         -80 (-33.06 % of base) : 9570.dasm - Microsoft.CodeAnalysis.PublicContract:ToBoxedImmutableArrayWithNonNullItems[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.String):System.Collections.Generic.IReadOnlyList`1[System.__Canon] (Tier0)
         -80 (-33.06 % of base) : 18.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon):ubyte (Tier0)
         -50 (-32.89 % of base) : 7741.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilder[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]] (Instrumented Tier0)
         -50 (-32.89 % of base) : 4892.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilder[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]] (Tier0)
        -140 (-32.56 % of base) : 4949.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.ValueTuple`3[int,int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`3[int,int,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.ValueTuple`3[int,int,System.__Canon]] (Tier0)
         -38 (-32.20 % of base) : 1414.dasm - Xunit.TestFrameworkOptions:SetValue[System.Nullable`1[ubyte]](System.String,System.Nullable`1[ubyte]):this (Tier0)
         -50 (-32.05 % of base) : 11617.dasm - Microsoft.VisualStudio.Composition.AttributeServices:GetFirstAttribute[System.__Canon](System.Reflection.ICustomAttributeProvider):System.__Canon (Instrumented Tier0)
         -50 (-32.05 % of base) : 6009.dasm - Microsoft.VisualStudio.Composition.AttributeServices:GetFirstAttribute[System.__Canon](System.Reflection.ICustomAttributeProvider):System.__Canon (Tier0)
        -162 (-31.89 % of base) : 2318.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)

librariestestsnotieredcompilation.run.linux.arm.Release.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 418846 (overridden on cmd)
Total bytes of diff: 414850 (overridden on cmd)
Total bytes of delta: -3996 (-0.95 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          68 : 4371.dasm (7.94 % of base)
          40 : 2906.dasm (14.49 % of base)
          34 : 67.dasm (17.00 % of base)
          12 : 2909.dasm (1.37 % of base)
           8 : 2315.dasm (3.92 % of base)
           4 : 5505.dasm (3.70 % of base)
           2 : 6685.dasm (1.01 % of base)
           2 : 1163.dasm (2.00 % of base)
           2 : 6115.dasm (3.12 % of base)

Top file improvements (bytes):
        -206 : 3065.dasm (-21.37 % of base)
        -200 : 1008.dasm (-19.88 % of base)
        -186 : 2986.dasm (-7.23 % of base)
        -124 : 12.dasm (-27.19 % of base)
        -124 : 9.dasm (-25.62 % of base)
        -108 : 480.dasm (-21.26 % of base)
        -108 : 765.dasm (-18.18 % of base)
        -106 : 3072.dasm (-15.96 % of base)
        -106 : 65.dasm (-17.97 % of base)
        -104 : 3313.dasm (-24.76 % of base)
         -86 : 2228.dasm (-28.10 % of base)
         -82 : 511.dasm (-17.67 % of base)
         -80 : 3420.dasm (-7.08 % of base)
         -76 : 493.dasm (-16.96 % of base)
         -64 : 635.dasm (-20.51 % of base)
         -62 : 2152.dasm (-21.83 % of base)
         -60 : 6111.dasm (-12.15 % of base)
         -54 : 865.dasm (-16.77 % of base)
         -54 : 6417.dasm (-19.85 % of base)
         -50 : 254.dasm (-13.30 % of base)

46 total files with Code Size differences (37 improved, 9 regressed), 31 unchanged.

Top method regressions (bytes):
          68 (7.94 % of base) : 4371.dasm - Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser:ParseCommaSeparatedSyntaxList[System.__Canon](byref,ushort,System.Func`2[Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser,ubyte],System.Func`2[System.__Canon,System.__Canon],Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser+SkipBadTokens`1[System.__Canon],ubyte,ubyte,ubyte):Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (FullOpts)
          40 (14.49 % of base) : 2906.dasm - System.Threading.Tasks.Dataflow.Internal.Common:ReleaseAllPostponedMessages[System.__Canon](System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon],System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader],byref) (FullOpts)
          34 (17.00 % of base) : 67.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
          12 (1.37 % of base) : 2909.dasm - Microsoft.VisualStudio.Composition.DiscoveredParts:.ctor(System.Collections.Generic.IEnumerable`1[Microsoft.VisualStudio.Composition.ComposablePartDefinition],System.Collections.Generic.IEnumerable`1[Microsoft.VisualStudio.Composition.PartDiscoveryException]):this (FullOpts)
           8 (3.92 % of base) : 2315.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.ValueTuple`2[int,System.__Canon]](System.Collections.Generic.List`1[System.ValueTuple`2[int,System.__Canon]]):System.Span`1[System.ValueTuple`2[int,System.__Canon]] (FullOpts)
           4 (3.70 % of base) : 5505.dasm - Microsoft.CodeAnalysis.IncrementalValueProviderExtensions:Collect[System.__Canon](Microsoft.CodeAnalysis.IncrementalValuesProvider`1[System.__Canon]):Microsoft.CodeAnalysis.IncrementalValueProvider`1[System.Collections.Immutable.ImmutableArray`1[System.__Canon]] (FullOpts)
           2 (1.01 % of base) : 6685.dasm - Microsoft.CodeAnalysis.CSharp.OverloadResolution:SingleValidResult[System.__Canon](Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder`1[Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon]]):ubyte (FullOpts)
           2 (3.12 % of base) : 6115.dasm - System.Collections.Immutable.ImmutableArray`1[System.__Canon]:As[System.__Canon]():System.Collections.Immutable.ImmutableArray`1[System.__Canon]:this (FullOpts)
           2 (2.00 % of base) : 1163.dasm - Xunit.Sdk.CollectionTrackerExtensions:AsTracker[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):Xunit.Sdk.CollectionTracker`1[System.__Canon] (FullOpts)

Top method improvements (bytes):
        -206 (-21.37 % of base) : 3065.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -200 (-19.88 % of base) : 1008.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -186 (-7.23 % of base) : 2986.dasm - Microsoft.VisualStudio.Composition.CompositionConfiguration:ComputeSharingBoundaryMetadata(System.Collections.Generic.IEnumerable`1[Microsoft.VisualStudio.Composition.CompositionConfiguration+PartBuilder]):System.Collections.Immutable.ImmutableDictionary`2[System.String,Microsoft.VisualStudio.Composition.CompositionConfiguration+SharingBoundaryMetadata] (FullOpts)
        -124 (-25.62 % of base) : 9.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -124 (-27.19 % of base) : 12.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -108 (-18.18 % of base) : 765.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon,System.Collections.Generic.IEqualityComparer`1[System.__Canon]):ubyte (FullOpts)
        -108 (-21.26 % of base) : 480.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -106 (-15.96 % of base) : 3072.dasm - Microsoft.VisualStudio.Composition.CompositionConfiguration:PathExistsBetween[System.__Canon](System.__Canon,System.__Canon,System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.HashSet`1[System.__Canon]):System.Collections.Immutable.ImmutableStack`1[System.__Canon] (FullOpts)
        -106 (-17.97 % of base) : 65.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -104 (-24.76 % of base) : 3313.dasm - Microsoft.CodeAnalysis.PublicContract:IndexOfNullOrDuplicateItem[System.__Canon](System.Collections.Generic.IReadOnlyList`1[System.__Canon]):int (FullOpts)
         -86 (-28.10 % of base) : 2228.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -82 (-17.67 % of base) : 511.dasm - System.Linq.Lookup`2[System.__Canon,System.__Canon]:Create[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Linq.Lookup`2[System.__Canon,System.__Canon] (FullOpts)
         -80 (-7.08 % of base) : 3420.dasm - System.Linq.Enumerable:SequenceEqual[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):ubyte (FullOpts)
         -76 (-16.96 % of base) : 493.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -64 (-20.51 % of base) : 635.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -62 (-21.83 % of base) : 2152.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.IEnumerable,byref):ubyte (FullOpts)
         -60 (-12.15 % of base) : 6111.dasm - Microsoft.CodeAnalysis.ImmutableArrayExtensions:GetTypesFromMemberMap[System.ReadOnlyMemory`1[ushort],System.__Canon,System.__Canon](System.Collections.Generic.Dictionary`2[System.ReadOnlyMemory`1[ushort],System.Collections.Immutable.ImmutableArray`1[System.__Canon]],System.Collections.Generic.IEqualityComparer`1[System.ReadOnlyMemory`1[ushort]]):System.Collections.Generic.Dictionary`2[System.ReadOnlyMemory`1[ushort],System.Collections.Immutable.ImmutableArray`1[System.__Canon]] (FullOpts)
         -54 (-19.85 % of base) : 6417.dasm - Roslyn.Utilities.ISetExtensions:AddAll[System.__Canon](System.Collections.Generic.ISet`1[System.__Canon],System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
         -54 (-16.77 % of base) : 865.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (FullOpts)
         -50 (-13.30 % of base) : 254.dasm - DictionaryExtensions:ToDictionaryIgnoringDuplicateKeys[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)

Top method regressions (percentages):
          34 (17.00 % of base) : 67.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
          40 (14.49 % of base) : 2906.dasm - System.Threading.Tasks.Dataflow.Internal.Common:ReleaseAllPostponedMessages[System.__Canon](System.Threading.Tasks.Dataflow.ITargetBlock`1[System.__Canon],System.Threading.Tasks.Dataflow.Internal.QueuedMap`2[System.__Canon,System.Threading.Tasks.Dataflow.DataflowMessageHeader],byref) (FullOpts)
          68 (7.94 % of base) : 4371.dasm - Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser:ParseCommaSeparatedSyntaxList[System.__Canon](byref,ushort,System.Func`2[Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser,ubyte],System.Func`2[System.__Canon,System.__Canon],Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax.LanguageParser+SkipBadTokens`1[System.__Canon],ubyte,ubyte,ubyte):Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (FullOpts)
           8 (3.92 % of base) : 2315.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.ValueTuple`2[int,System.__Canon]](System.Collections.Generic.List`1[System.ValueTuple`2[int,System.__Canon]]):System.Span`1[System.ValueTuple`2[int,System.__Canon]] (FullOpts)
           4 (3.70 % of base) : 5505.dasm - Microsoft.CodeAnalysis.IncrementalValueProviderExtensions:Collect[System.__Canon](Microsoft.CodeAnalysis.IncrementalValuesProvider`1[System.__Canon]):Microsoft.CodeAnalysis.IncrementalValueProvider`1[System.Collections.Immutable.ImmutableArray`1[System.__Canon]] (FullOpts)
           2 (3.12 % of base) : 6115.dasm - System.Collections.Immutable.ImmutableArray`1[System.__Canon]:As[System.__Canon]():System.Collections.Immutable.ImmutableArray`1[System.__Canon]:this (FullOpts)
           2 (2.00 % of base) : 1163.dasm - Xunit.Sdk.CollectionTrackerExtensions:AsTracker[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):Xunit.Sdk.CollectionTracker`1[System.__Canon] (FullOpts)
          12 (1.37 % of base) : 2909.dasm - Microsoft.VisualStudio.Composition.DiscoveredParts:.ctor(System.Collections.Generic.IEnumerable`1[Microsoft.VisualStudio.Composition.ComposablePartDefinition],System.Collections.Generic.IEnumerable`1[Microsoft.VisualStudio.Composition.PartDiscoveryException]):this (FullOpts)
           2 (1.01 % of base) : 6685.dasm - Microsoft.CodeAnalysis.CSharp.OverloadResolution:SingleValidResult[System.__Canon](Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder`1[Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon]]):ubyte (FullOpts)

Top method improvements (percentages):
         -26 (-38.24 % of base) : 5332.dasm - System.Linq.Enumerable:SingleOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (FullOpts)
         -22 (-33.33 % of base) : 4609.dasm - Microsoft.CodeAnalysis.ImmutableArrayExtensions:AsImmutable[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Immutable.ImmutableArray`1[System.__Canon] (FullOpts)
         -30 (-33.33 % of base) : 10.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
         -22 (-32.35 % of base) : 3644.dasm - System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -20 (-32.26 % of base) : 2171.dasm - System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -22 (-30.56 % of base) : 4684.dasm - System.Collections.Immutable.ImmutableDictionary:ToImmutableDictionary[System.__Canon,int](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]):System.Collections.Immutable.ImmutableDictionary`2[System.__Canon,int] (FullOpts)
         -20 (-30.30 % of base) : 821.dasm - System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[System.__Canon]:Start[Xunit.Sdk.TestAssemblyRunner`1+<RunAsync>d__41[System.__Canon]](byref):this (FullOpts)
         -30 (-28.30 % of base) : 2409.dasm - System.Collections.Immutable.SecurePooledObject`1[System.__Canon]:TryUse[System.Collections.Immutable.SortedInt32KeyNode`1+Enumerator[System.Collections.Immutable.ImmutableDictionary`2+HashBucket[System.__Canon,System.__Canon]]](byref,byref):ubyte:this (FullOpts)
         -86 (-28.10 % of base) : 2228.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -22 (-27.50 % of base) : 273.dasm - <PrivateImplementationDetails>:InlineArrayAsReadOnlySpan[System.Collections.Generic.SegmentedArrayBuilder`1+Arrays[System.__Canon],System.__Canon](byref,int):System.ReadOnlySpan`1[System.__Canon] (FullOpts)
         -22 (-27.50 % of base) : 68.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon],System.__Canon](byref,int):System.Span`1[System.__Canon] (FullOpts)
         -22 (-27.50 % of base) : 1007.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -124 (-27.19 % of base) : 12.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
         -26 (-27.08 % of base) : 113.dasm - System.Linq.Enumerable:HashSetToArray[System.__Canon](System.Collections.Generic.HashSet`1[System.__Canon]):System.__Canon[] (FullOpts)
         -22 (-26.83 % of base) : 2372.dasm - System.Collections.Immutable.ImmutableDictionary:ToImmutableDictionary[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon],System.__Canon,System.Collections.Immutable.ImmutableArray`1[Microsoft.CodeAnalysis.Text.TextSpan]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]],System.Func`2[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon],System.__Canon],System.Func`2[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon],System.Collections.Immutable.ImmutableArray`1[Microsoft.CodeAnalysis.Text.TextSpan]]):System.Collections.Immutable.ImmutableDictionary`2[System.__Canon,System.Collections.Immutable.ImmutableArray`1[Microsoft.CodeAnalysis.Text.TextSpan]] (FullOpts)
         -18 (-26.47 % of base) : 2151.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -22 (-26.19 % of base) : 3376.dasm - System.Collections.Immutable.ImmutableSortedDictionary:ToImmutableSortedDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IComparer`1[System.__Canon]):System.Collections.Immutable.ImmutableSortedDictionary`2[System.__Canon,System.__Canon] (FullOpts)
         -40 (-25.97 % of base) : 3151.dasm - Microsoft.VisualStudio.Composition.DelegateServices:AsFunc[System.__Canon](System.__Canon):System.Func`1[System.__Canon] (FullOpts)
         -18 (-25.71 % of base) : 4957.dasm - Microsoft.CodeAnalysis.Collections.RoslynImmutableInterlocked:InterlockedExchange[System.__Canon](byref,Microsoft.CodeAnalysis.Collections.ImmutableSegmentedHashSet`1[System.__Canon]):Microsoft.CodeAnalysis.Collections.ImmutableSegmentedHashSet`1[System.__Canon] (FullOpts)
        -124 (-25.62 % of base) : 9.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)

realworld.run.linux.arm.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os linux -target_arch arm -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 1992442 (overridden on cmd)
Total bytes of diff: 1987742 (overridden on cmd)
Total bytes of delta: -4700 (-0.24 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
         166 : 7264.dasm (27.30 % of base)
          64 : 6913.dasm (21.19 % of base)
          64 : 6924.dasm (21.19 % of base)
          64 : 6934.dasm (21.62 % of base)
          56 : 6937.dasm (18.54 % of base)
          12 : 5736.dasm (3.64 % of base)
          12 : 6860.dasm (10.00 % of base)
          12 : 3328.dasm (6.06 % of base)
           8 : 3300.dasm (5.00 % of base)
           8 : 4263.dasm (4.21 % of base)
           8 : 5572.dasm (4.12 % of base)
           6 : 6935.dasm (2.54 % of base)
           4 : 3089.dasm (3.23 % of base)

Top file improvements (bytes):
        -206 : 4286.dasm (-21.68 % of base)
        -124 : 821.dasm (-27.19 % of base)
        -124 : 252.dasm (-25.62 % of base)
        -116 : 7098.dasm (-17.06 % of base)
        -108 : 256.dasm (-21.26 % of base)
        -106 : 745.dasm (-17.97 % of base)
        -100 : 6278.dasm (-21.93 % of base)
         -98 : 5962.dasm (-15.71 % of base)
         -90 : 7058.dasm (-19.57 % of base)
         -84 : 7259.dasm (-18.10 % of base)
         -76 : 661.dasm (-16.96 % of base)
         -68 : 4150.dasm (-16.92 % of base)
         -68 : 3897.dasm (-16.50 % of base)
         -64 : 218.dasm (-20.13 % of base)
         -62 : 3890.dasm (-19.02 % of base)
         -62 : 7465.dasm (-21.83 % of base)
         -60 : 6168.dasm (-5.36 % of base)
         -58 : 6005.dasm (-21.80 % of base)
         -58 : 5754.dasm (-21.80 % of base)
         -54 : 5618.dasm (-14.84 % of base)

53 total files with Code Size differences (40 improved, 13 regressed), 27 unchanged.

Top method regressions (bytes):
         166 (27.30 % of base) : 7264.dasm - Internal.Utilities.Library.List:mapq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
          64 (21.62 % of base) : 6934.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_binop_ty[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          64 (21.19 % of base) : 6924.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_compare_sig[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          64 (21.19 % of base) : 6913.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_rel_sig[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          56 (18.54 % of base) : 6937.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_binop_ty3[System.__Canon,System.__Canon](System.__Canon,System.__Canon,System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          12 (10.00 % of base) : 6860.dasm - Internal.Utilities.Collections.QueueList:foldBack[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Internal.Utilities.Collections.QueueList`1[System.__Canon],System.__Canon):System.__Canon (FullOpts)
          12 (3.64 % of base) : 5736.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallThenContinue[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon,Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
          12 (6.06 % of base) : 3328.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvoke[System.__Canon,System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
           8 (4.12 % of base) : 5572.dasm - Microsoft.FSharp.Primitives.Basics.List:rev[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
           8 (5.00 % of base) : 3300.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
           8 (4.21 % of base) : 4263.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (FullOpts)
           6 (2.54 % of base) : 6935.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_unop_ty[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
           4 (3.23 % of base) : 3089.dasm - Microsoft.FSharp.Collections.PrivateListHelpers:appendToFreshConsTail[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)

Top method improvements (bytes):
        -206 (-21.68 % of base) : 4286.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -124 (-25.62 % of base) : 252.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -124 (-27.19 % of base) : 821.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -116 (-17.06 % of base) : 7098.dasm - Microsoft.FSharp.Primitives.Basics.List:mapFold[System.__Canon,System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon,Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):System.Tuple`2[System.__Canon,System.__Canon] (FullOpts)
        -108 (-21.26 % of base) : 256.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -106 (-17.97 % of base) : 745.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -100 (-21.93 % of base) : 6278.dasm - Microsoft.FSharp.Primitives.Basics.List:unzip[System.__Canon,System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):System.Tuple`2[System.__Canon,System.__Canon] (FullOpts)
         -98 (-15.71 % of base) : 5962.dasm - Microsoft.FSharp.Primitives.Basics.List:partition[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,ubyte],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):System.Tuple`2[System.__Canon,System.__Canon] (FullOpts)
         -90 (-19.57 % of base) : 7058.dasm - Microsoft.FSharp.Primitives.Basics.List:map2[System.__Canon,ubyte,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[ubyte]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -84 (-18.10 % of base) : 7259.dasm - Microsoft.FSharp.Primitives.Basics.List:zip[System.__Canon,System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -76 (-16.96 % of base) : 661.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -68 (-16.92 % of base) : 4150.dasm - Microsoft.FSharp.Primitives.Basics.List:indexed[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -68 (-16.50 % of base) : 3897.dasm - Microsoft.FSharp.Primitives.Basics.List:mapi[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[int,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -64 (-20.13 % of base) : 218.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (FullOpts)
         -62 (-19.02 % of base) : 3890.dasm - Internal.Utilities.Collections.AgedLookup`3[System.__Canon,System.__Canon,System.__Canon]:TryGetKeyValueImpl[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
         -62 (-21.83 % of base) : 7465.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.IEnumerable,byref):ubyte (FullOpts)
         -60 (-5.36 % of base) : 6168.dasm - FSharp.Compiler.Import:multisetDiscriminateAndMap[System.__Canon,System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -58 (-21.80 % of base) : 5754.dasm - FSharp.Compiler.BuildGraph+NodeCodeBuilder:Bind[System.Threading.CancellationToken,System.__Canon](FSharp.Compiler.BuildGraph+NodeCode`1[System.Threading.CancellationToken],Microsoft.FSharp.Core.FSharpFunc`2[System.Threading.CancellationToken,System.__Canon]):FSharp.Compiler.BuildGraph+NodeCode`1[System.__Canon]:this (FullOpts)
         -58 (-21.80 % of base) : 6005.dasm - FSharp.Compiler.BuildGraph+NodeCodeBuilder:Combine[System.__Canon](FSharp.Compiler.BuildGraph+NodeCode`1[Microsoft.FSharp.Core.Unit],FSharp.Compiler.BuildGraph+NodeCode`1[System.__Canon]):FSharp.Compiler.BuildGraph+NodeCode`1[System.__Canon]:this (FullOpts)
         -54 (-14.84 % of base) : 5618.dasm - Microsoft.FSharp.Primitives.Basics.List:distinctWithComparer[System.__Canon](System.Collections.Generic.IEqualityComparer`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)

Top method regressions (percentages):
         166 (27.30 % of base) : 7264.dasm - Internal.Utilities.Library.List:mapq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
          64 (21.62 % of base) : 6934.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_binop_ty[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          64 (21.19 % of base) : 6924.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_compare_sig[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          64 (21.19 % of base) : 6913.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_rel_sig[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          56 (18.54 % of base) : 6937.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_binop_ty3[System.__Canon,System.__Canon](System.__Canon,System.__Canon,System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)
          12 (10.00 % of base) : 6860.dasm - Internal.Utilities.Collections.QueueList:foldBack[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Internal.Utilities.Collections.QueueList`1[System.__Canon],System.__Canon):System.__Canon (FullOpts)
          12 (6.06 % of base) : 3328.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallThenInvoke[System.__Canon,System.__Canon](Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
           8 (5.00 % of base) : 3300.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
           8 (4.21 % of base) : 4263.dasm - System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon] (FullOpts)
           8 (4.12 % of base) : 5572.dasm - Microsoft.FSharp.Primitives.Basics.List:rev[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
          12 (3.64 % of base) : 5736.dasm - Microsoft.FSharp.Control.AsyncPrimitives:CallThenContinue[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon,Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon]):Microsoft.FSharp.Control.AsyncReturn (FullOpts)
           4 (3.23 % of base) : 3089.dasm - Microsoft.FSharp.Collections.PrivateListHelpers:appendToFreshConsTail[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
           6 (2.54 % of base) : 6935.dasm - FSharp.Compiler.TcGlobals+TcGlobals:mk_unop_ty[System.__Canon](System.__Canon):System.Tuple`2[System.__Canon,System.__Canon]:this (FullOpts)

Top method improvements (percentages):
         -28 (-34.15 % of base) : 4173.dasm - Microsoft.FSharp.Collections.IEnumerator:mkSeq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -28 (-34.15 % of base) : 3330.dasm - Microsoft.FSharp.Control.AsyncPrimitives:MakeAsync[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)
         -22 (-33.33 % of base) : 7277.dasm - Microsoft.FSharp.Collections.ArrayModule:OfList[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):System.__Canon[] (FullOpts)
         -22 (-33.33 % of base) : 5634.dasm - Microsoft.FSharp.Collections.ListModule:Reverse[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -22 (-33.33 % of base) : 6238.dasm - Microsoft.FSharp.Collections.MapModule:OfList[System.__Canon,System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.__Canon] (FullOpts)
         -22 (-33.33 % of base) : 6596.dasm - Microsoft.FSharp.Collections.MapModule:OfSeq[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.__Canon] (FullOpts)
         -22 (-33.33 % of base) : 3480.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:CreateDictionary[System.__Canon,System.Decimal](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IDictionary`2[System.__Canon,System.Decimal] (FullOpts)
         -30 (-33.33 % of base) : 253.dasm - System.Linq.Enumerable:IsEmptyArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):ubyte (FullOpts)
         -40 (-27.78 % of base) : 3247.dasm - Microsoft.FSharp.Control.AsyncPrimitives:MakeAsyncWithCancelCheck[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.AsyncActivation`1[System.__Canon],System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)
         -36 (-27.69 % of base) : 6595.dasm - Microsoft.FSharp.Collections.SeqModule:mkDelayedSeq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -36 (-27.69 % of base) : 7434.dasm - Microsoft.FSharp.Collections.SeqModule:Singleton[System.__Canon](System.__Canon):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -36 (-27.69 % of base) : 7039.dasm - Microsoft.FSharp.Control.FSharpAsync:AwaitTask[System.__Canon](System.Threading.Tasks.Task`1[System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)
         -36 (-27.69 % of base) : 5672.dasm - Microsoft.FSharp.Control.FSharpAsync:FromContinuations[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon] (FullOpts)
         -36 (-27.69 % of base) : 3246.dasm - Microsoft.FSharp.Control.FSharpAsyncBuilder:Delay[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Control.FSharpAsync`1[System.__Canon]:this (FullOpts)
         -36 (-27.69 % of base) : 6676.dasm - Microsoft.FSharp.Control.LazyExtensions:CreateFromValue[System.__Canon](System.__Canon):System.Lazy`1[System.__Canon] (FullOpts)
         -26 (-27.66 % of base) : 4057.dasm - Internal.Utilities.Collections.AgedLookup`3[System.__Canon,System.__Canon,System.__Canon]:Exists[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],System.__Canon):ubyte:this (FullOpts)
        -124 (-27.19 % of base) : 821.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
         -26 (-27.08 % of base) : 840.dasm - System.Linq.Enumerable:HashSetToArray[System.__Canon](System.Collections.Generic.HashSet`1[System.__Canon]):System.__Canon[] (FullOpts)
         -18 (-26.47 % of base) : 3898.dasm - Microsoft.FSharp.Collections.ListModule:Filter[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,ubyte],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -18 (-26.47 % of base) : 6526.dasm - Microsoft.FSharp.Collections.ListModule:Initialize[System.__Canon](int,Microsoft.FSharp.Core.FSharpFunc`2[int,System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)

windows x86

Diffs are based on 53,492 contexts (17,492 MinOpts, 36,000 FullOpts).

MISSED contexts: base: 3,510 (3.05%), diff: 58,094 (50.45%)

Overall (-52,308 bytes)

Collection Base size (bytes) Diff size (bytes)
benchmarks.run.windows.x86.checked.mch 298,081 -3,108
benchmarks.run_pgo.windows.x86.checked.mch 726,262 -8,964
benchmarks.run_tiered.windows.x86.checked.mch 706,843 -9,977
coreclr_tests.run.windows.x86.checked.mch 46,161 -42
libraries.pmi.windows.x86.checked.mch 1,461,078 -3,494
libraries_tests.run.windows.x86.Release.mch 510,379 -15,767
librariestestsnotieredcompilation.run.windows.x86.Release.mch 256,268 -5,307
realworld.run.windows.x86.checked.mch 481,011 -5,649

MinOpts (-27,508 bytes)

Collection Base size (bytes) Diff size (bytes)
benchmarks.run_pgo.windows.x86.checked.mch 414,129 -6,800
benchmarks.run_tiered.windows.x86.checked.mch 520,835 -7,704
libraries_tests.run.windows.x86.Release.mch 413,867 -13,004

FullOpts (-24,800 bytes)

Collection Base size (bytes) Diff size (bytes)
benchmarks.run.windows.x86.checked.mch 297,884 -3,108
benchmarks.run_pgo.windows.x86.checked.mch 312,133 -2,164
benchmarks.run_tiered.windows.x86.checked.mch 186,008 -2,273
coreclr_tests.run.windows.x86.checked.mch 46,161 -42
libraries.pmi.windows.x86.checked.mch 1,461,078 -3,494
libraries_tests.run.windows.x86.Release.mch 96,512 -2,763
librariestestsnotieredcompilation.run.windows.x86.Release.mch 256,268 -5,307
realworld.run.windows.x86.checked.mch 481,011 -5,649

Example diffs

benchmarks.run.windows.x86.checked.mch

-32 (-34.41%) : 3570.dasm - System.Collections.Generic.EnumerableHelpers:GetEmptyEnumeratorSystem.__Canon:System.Collections.Generic.IEnumerator`1System.__Canon 

@@ -7,13 +7,10 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->  esi         single-def
-;  V01 loc0         [V01,T04] (  3,  4   )     int  ->  edi         "spilling helperCall"
+;  V00 TypeCtx      [V00,T00] (  5,  5   )     int  ->  esi         single-def
+;  V01 loc0         [V01,T01] (  2,  4   )     int  ->  edi         "spilling helperCall"
 ;* V02 tmp1         [V02    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V03 tmp2         [V03,T05] (  3,  4   )     int  ->  ebx         "VirtualCall with runtime lookup"
-;  V04 rat0         [V04,T01] (  3,  5.60)     int  ->  edi         "fgMakeTemp is creating a new local variable"
-;  V05 rat1         [V05,T02] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V06 rat2         [V06,T03] (  3,  4.48)     int  ->  ebx         "fgMakeTemp is creating a new local variable"
+;  V03 tmp2         [V03,T02] (  2,  4   )     int  ->  esi         "VirtualCall with runtime lookup"
 ;
 ; Lcl frame size = 4
 
@@ -22,66 +19,38 @@ G_M57211_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      ebp, esp
        push     edi
        push     esi
-       push     ebx
        push     eax
-       mov      dword ptr [ebp-0x10], ecx
+       mov      dword ptr [ebp-0x0C], ecx
        mov      esi, ecx
-                        ;; size=12 bbWeight=1 PerfScore 6.50
-G_M57211_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       mov      edi, dword ptr [ecx+0x08]
-       test     edi, edi
-       je       SHORT G_M57211_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M57211_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M57211_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M57211_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+                       ;; size=11 bbWeight=1 PerfScore 5.50
+G_M57211_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      edi, eax
-                        ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M57211_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M57211_IG08
-                       ;; size=9 bbWeight=1 PerfScore 6.00
-G_M57211_IG06:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ebx, dword ptr [ecx+0x0C]
-       test     ebx, ebx
-       je       SHORT G_M57211_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M57211_IG07:        ; bbWeight=0.64, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M57211_IG09
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M57211_IG08:        ; bbWeight=0.36, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      ebx, eax
-                       ;; size=14 bbWeight=0.36 PerfScore 0.63
-G_M57211_IG09:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+       call     CORINFO_HELP_MEMCPY
+       mov      esi, eax
        mov      ecx, edi
        call     [System.Array:Empty[System.__Canon]():System.__Canon[]]
        ; gcrRegs +[eax]
        mov      ecx, eax
        ; gcrRegs +[ecx]
-       mov      eax, ebx
+       mov      eax, esi
        ; gcrRegs -[eax]
        nop      
        call     [eax]
        ; gcrRegs -[ecx] +[eax]
-                       ;; size=17 bbWeight=1 PerfScore 7.00
-G_M57211_IG10:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=45 bbWeight=1 PerfScore 10.50
+G_M57211_IG03:        ; bbWeight=1, epilog, nogc, extend
        pop      ecx
-       pop      ebx
        pop      esi
        pop      edi
        pop      ebp
        ret      
-                     ;; size=6 bbWeight=1 PerfScore 3.50
+                       ;; size=5 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 93, prolog size 10, PerfScore 34.71, instruction count 40, allocated bytes for code 93 (MethodHash=f41c2084) for method System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (FullOpts)
+; Total bytes of code 61, prolog size 9, PerfScore 19.00, instruction count 26, allocated bytes for code 61 (MethodHash=f41c2084) for method System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (FullOpts)
 ; ============================================================

-32 (-32.00%) : 4688.dasm - ProtoBuf.Meta.RuntimeTypeModel:GetSerializerSystem.__Canon:ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (FullOpts) 

@@ -7,16 +7,12 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T03] (  3,  3   )     ref  ->  edi         this class-hnd single-def <ProtoBuf.Meta.RuntimeTypeModel>
-;  V01 TypeCtx      [V01,T00] (  7,  5.56)     int  ->  esi         single-def
-;  V02 loc0         [V02,T05] (  3,  4   )     int  ->  ebx         "spilling helperCall"
+;  V00 this         [V00,T01] (  3,  3   )     ref  ->  edi         this class-hnd single-def <ProtoBuf.Meta.RuntimeTypeModel>
+;  V01 TypeCtx      [V01,T00] (  5,  5   )     int  ->  esi         single-def
+;  V02 loc0         [V02,T03] (  2,  4   )     int  ->  ebx         "spilling helperCall"
 ;* V03 tmp1         [V03    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V04 tmp2         [V04,T08] (  2,  4   )     int  ->  esi         "argument with side effect"
-;  V05 tmp3         [V05,T07] (  2,  4   )     ref  ->  edx         single-def "argument with side effect"
-;  V06 rat0         [V06,T01] (  3,  5.60)     int  ->  ebx         "fgMakeTemp is creating a new local variable"
-;  V07 rat1         [V07,T06] (  3,  4   )     int  ->  esi         "runtime lookup"
-;  V08 rat2         [V08,T02] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V09 rat3         [V09,T04] (  3,  4.48)     int  ->  eax         "fgMakeTemp is creating a new local variable"
+;  V04 tmp2         [V04,T04] (  2,  4   )     int  ->  esi         "argument with side effect"
+;  V05 tmp3         [V05,T02] (  2,  4   )     ref  ->  edx         single-def "argument with side effect"
 ;
 ; Lcl frame size = 4
 
@@ -32,42 +28,15 @@ G_M14728_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; gcrRegs +[edi]
        mov      esi, edx
                        ;; size=14 bbWeight=1 PerfScore 6.75
-G_M14728_IG02:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       mov      ebx, dword ptr [ecx+0x08]
-       test     ebx, ebx
-       je       SHORT G_M14728_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M14728_IG03:        ; bbWeight=0.80, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M14728_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M14728_IG04:        ; bbWeight=0.20, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref
+G_M14728_IG02:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      ebx, eax
-                        ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M14728_IG05:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M14728_IG08
-                       ;; size=9 bbWeight=1 PerfScore 6.00
-G_M14728_IG06:        ; bbWeight=0.80, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ecx+0x0C]
-       test     eax, eax
-       je       SHORT G_M14728_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M14728_IG07:        ; bbWeight=0.64, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref, isz
-       mov      esi, eax
-       jmp      SHORT G_M14728_IG09
-                       ;; size=4 bbWeight=0.64 PerfScore 1.44
-G_M14728_IG08:        ; bbWeight=0.36, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      esi, eax
-                        ;; size=14 bbWeight=0.36 PerfScore 0.63
-G_M14728_IG09:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref
        push     ebx
        mov      ecx, edi
        ; gcrRegs +[ecx]
@@ -77,10 +46,10 @@ G_M14728_IG09:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000000
        mov      edx, eax
        ; gcrRegs +[edx]
        mov      ecx, esi
-       call     CORINFO_HELP_ISINSTANCEOFINTERFACE
+       call     CORINFO_HELP_INITINSTCLASS
        ; gcrRegs -[edx]
-                      ;; size=20 bbWeight=1 PerfScore 6.00
-G_M14728_IG10:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=48 bbWeight=1 PerfScore 9.50
+G_M14728_IG03:        ; bbWeight=1, epilog, nogc, extend
        pop      ecx
        pop      ebx
        pop      esi
@@ -89,6 +58,6 @@ G_M14728_IG10:        ; bbWeight=1, epilog, nogc, extend
        ret      
                        ;; size=6 bbWeight=1 PerfScore 3.50
 
-; Total bytes of code 100, prolog size 10, PerfScore 34.12, instruction count 43, allocated bytes for code 100 (MethodHash=42b4c677) for method ProtoBuf.Meta.RuntimeTypeModel:GetSerializer[System.__Canon]():ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (FullOpts)
+; Total bytes of code 68, prolog size 10, PerfScore 19.75, instruction count 30, allocated bytes for code 68 (MethodHash=42b4c677) for method ProtoBuf.Meta.RuntimeTypeModel:GetSerializer[System.__Canon]():ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (FullOpts)
 ; ============================================================

-30 (-28.57%) : 1506.dasm - System.Linq.Enumerable:SetCountAndGetSpanSystem.__Canon:System.Span`1System.__Canon 

@@ -7,17 +7,12 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 RetBuf       [V00,T03] (  3,  3   )   byref  ->  edi         single-def
+;  V00 RetBuf       [V00,T01] (  3,  3   )   byref  ->  edi         single-def
 ;  V01 arg0         [V01,T00] (  4,  4   )     ref  ->  esi         class-hnd single-def <System.Collections.Generic.List`1[System.__Canon]>
-;  V02 arg1         [V02,T08] (  1,  1   )     int  ->  [ebp+0x0C]  single-def
-;  V03 TypeCtx      [V03,T07] (  5,  3.56)     int  ->  ebx         single-def
+;  V02 arg1         [V02,T03] (  1,  1   )     int  ->  [ebp+0x0C]  single-def
+;  V03 TypeCtx      [V03,T02] (  3,  3   )     int  ->  ebx         single-def
 ;* V04 loc0         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V05 loc1         [V05    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V06 rat0         [V06,T05] (  3,  4   )     int  ->  eax         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->  eax         "fgMakeTemp is creating a new local variable"
-;  V08 rat2         [V08,T06] (  3,  4   )     int  ->  eax         "runtime lookup"
-;  V09 rat3         [V09,T02] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V10 rat4         [V10,T04] (  3,  4.48)     int  ->  eax         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 4
 
@@ -36,45 +31,19 @@ G_M26687_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; gcrRegs +[esi]
        mov      ebx, dword ptr [ebp+0x08]
                        ;; size=20 bbWeight=1 PerfScore 9.75
-G_M26687_IG02:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
-       mov      ecx, dword ptr [ebx+0x20]
-       mov      eax, dword ptr [ecx+0x08]
-       test     eax, eax
-       je       SHORT G_M26687_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M26687_IG03:        ; bbWeight=0.80, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
-       jmp      SHORT G_M26687_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M26687_IG04:        ; bbWeight=0.20, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref
+G_M26687_IG02:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M26687_IG05:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
+       call     CORINFO_HELP_MEMCPY
        push     eax
        mov      edx, dword ptr [ebp+0x0C]
        mov      ecx, esi
        ; gcrRegs +[ecx]
        call     [System.Runtime.InteropServices.CollectionsMarshal:SetCount[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int)]
        ; gcrRegs -[ecx]
-       mov      ecx, dword ptr [ebx+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M26687_IG08
-                       ;; size=21 bbWeight=1 PerfScore 11.25
-G_M26687_IG06:        ; bbWeight=0.80, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
-       mov      eax, dword ptr [ecx+0x0C]
-       test     eax, eax
-       je       SHORT G_M26687_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M26687_IG07:        ; bbWeight=0.64, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
-       jmp      SHORT G_M26687_IG09
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M26687_IG08:        ; bbWeight=0.36, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=12 bbWeight=0.36 PerfScore 0.54
-G_M26687_IG09:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref
+       call     CORINFO_HELP_MEMCPY
        push     eax
        mov      edx, esi
        ; gcrRegs +[edx]
@@ -83,8 +52,8 @@ G_M26687_IG09:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000080
        call     [System.Runtime.InteropServices.CollectionsMarshal:AsSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon]):System.Span`1[System.__Canon]]
        ; gcrRegs -[edx esi]
        ; byrRegs -[ecx edi]
-                      ;; size=11 bbWeight=1 PerfScore 4.50
-G_M26687_IG10:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=47 bbWeight=1 PerfScore 12.75
+G_M26687_IG03:        ; bbWeight=1, epilog, nogc, extend
        pop      ecx
        pop      ebx
        pop      esi
@@ -93,6 +62,6 @@ G_M26687_IG10:        ; bbWeight=1, epilog, nogc, extend
        ret      8
                        ;; size=8 bbWeight=1 PerfScore 4.50
 
-; Total bytes of code 105, prolog size 13, PerfScore 41.57, instruction count 43, allocated bytes for code 105 (MethodHash=8da497c0) for method System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (FullOpts)
+; Total bytes of code 75, prolog size 13, PerfScore 27.00, instruction count 31, allocated bytes for code 75 (MethodHash=8da497c0) for method System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (FullOpts)
 ; ============================================================

+0 (0.00%) : 6512.dasm - System.Numerics.Tests.Perf_VectorOf1[ubyte]:MultiplyOperatorBenchmark():System.Numerics.Vector1[ubyte]:this (FullOpts) 

@@ -31,7 +31,7 @@
 ;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "Inline stloc first use temp"
 ;* V21 tmp19        [V21    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V22 tmp20        [V22    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;* V23 cse0         [V23,T07] (  0,  0   )     int  ->  zero-ref    "CSE - moderate"
+;* V23 cse0         [V23,T07] (  0,  0   )   byref  ->  zero-ref    "CSE - moderate"
 ;
 ; Lcl frame size = 96
 
@@ -49,7 +49,8 @@ G_M16640_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
 G_M16640_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
        mov      ecx, 0xD1FFAB1E
        xor      edx, edx
-       call     CORINFO_HELP_CLASSINIT_SHARED_DYNAMICCLASS
+       call     CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE_DYNAMICCLASS
+       ; byrRegs +[eax]
        vmovups  ymm0, ymmword ptr [D1FFAB1EH]      ; static handle
        vmovups  ymmword ptr [ebp-0x4C], ymm0
        vmovups  ymm0, ymmword ptr [D1FFAB1EH]      ; static handle
@@ -57,6 +58,7 @@ G_M16640_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {e
        xor      edi, edi
                        ;; size=40 bbWeight=1 PerfScore 13.75
 G_M16640_IG03:        ; bbWeight=4, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
+       ; byrRegs -[eax]
        test     edi, edi
        jl       SHORT G_M16640_IG05
                        ;; size=4 bbWeight=4 PerfScore 5.00

+9 (+1.56%) : 6254.dasm - System.Collections.PerfFrozenDictionaryString:ToImmutableDictionary():System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]:this (FullOpts) 

@@ -8,53 +8,54 @@
 ; 0 inlinees with PGO data; 28 single block inlinees; 15 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T06] (  3,  3   )     ref  ->  ecx         this class-hnd single-def <System.Collections.Perf_FrozenDictionary_String>
-;  V01 tmp0         [V01,T01] (  5,  8   )     ref  ->  esi         class-hnd single-def "Inlining Arg" <<unknown class>>
-;  V02 tmp1         [V02,T15] (  3,  2   )     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;* V03 tmp2         [V03    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling QMark2" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;  V04 tmp3         [V04,T08] (  6,  3   )     ref  ->  esi         class-hnd exact "Inline stloc first use temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;  V05 tmp4         [V05,T12] (  4,  2   )     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;  V06 tmp5         [V06,T09] (  3,  3   )     ref  ->  ecx         class-hnd "Inlining Arg" <<unknown class>>
-;  V07 tmp6         [V07,T04] (  5,  5   )     ref  ->  edx         class-hnd "Inlining Arg" <<unknown class>>
-;  V08 tmp7         [V08,T25] (  2,  1   )     ref  ->  edi         class-hnd exact single-def "Inline stloc first use temp" <<unknown class>>
-;  V09 tmp8         [V09,T00] ( 12, 12   )     ref  ->  ebx         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;* V10 tmp9         [V10    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "Inline stloc first use temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;* V11 tmp10        [V11    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def "Inline stloc first use temp" <<unknown class>>
-;  V12 tmp11        [V12,T03] (  6,  6   )     ref  ->  ebx         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;  V00 this         [V00,T07] (  3,  3   )     ref  ->  ecx         this class-hnd single-def <System.Collections.Perf_FrozenDictionary_String>
+;  V01 tmp0         [V01,T02] (  4,  7   )     ref  ->  esi         class-hnd single-def "Inlining Arg" <<unknown class>>
+;  V02 tmp1         [V02,T17] (  3,  2   )     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;  V03 tmp2         [V03,T08] (  7,  4.50)     ref  ->  edi         class-hnd exact single-def "Inline stloc first use temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;  V04 tmp3         [V04,T14] (  4,  2   )     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;  V05 tmp4         [V05,T11] (  3,  3   )     ref  ->  ecx         class-hnd "Inlining Arg" <<unknown class>>
+;  V06 tmp5         [V06,T05] (  5,  5   )     ref  ->  edx         class-hnd "Inlining Arg" <<unknown class>>
+;  V07 tmp6         [V07,T27] (  2,  1   )     ref  ->  esi         class-hnd exact single-def "Inline stloc first use temp" <<unknown class>>
+;  V08 tmp7         [V08,T00] ( 12, 12   )     ref  ->  ebx         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;* V09 tmp8         [V09    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "Inline stloc first use temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;* V10 tmp9         [V10    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def "Inline stloc first use temp" <<unknown class>>
+;  V11 tmp10        [V11,T04] (  6,  6   )     ref  ->  ebx         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;* V12 tmp11        [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "Inlining Arg" <System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]>
 ;* V13 tmp12        [V13    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "Inlining Arg" <System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]>
-;* V14 tmp13        [V14    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "Inlining Arg" <System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]>
-;  V15 tmp14        [V15,T21] (  3,  1.50)     ref  ->  edi         class-hnd "Inline return value spill temp" <<unknown class>>
-;  V16 tmp15        [V16,T16] (  2,  2   )     ref  ->  eax         class-hnd exact single-def "Inlining Arg" <System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]>
-;  V17 tmp16        [V17,T07] (  4,  4   )     ref  ->  [ebp-0x18]  class-hnd exact spill-single-def "Inlining Arg" <System.Collections.Immutable.SortedInt32KeyNode`1[System.Collections.Immutable.ImmutableDictionary`2+HashBucket[System.__Canon,System.__Canon]]>
-;  V18 tmp17        [V18,T19] (  2,  2   )     int  ->  esi         "Inlining Arg"
-;* V19 tmp18        [V19    ] (  0,  0   )     ref  ->  zero-ref    single-def
-;  V20 tmp19        [V20,T26] (  2,  1   )     ref  ->  edi        
-;* V21 tmp20        [V21    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "impAppendStmt" <<unknown class>>
-;* V22 tmp21        [V22    ] (  0,  0   )     ref  ->  zero-ref    single-def
-;  V23 tmp22        [V23,T13] (  4,  2   )     ref  ->  edi        
-;* V24 tmp23        [V24    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "impAppendStmt" <<unknown class>>
-;* V25 tmp24        [V25    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;* V26 tmp25        [V26    ] (  0,  0   )  struct ( 8) zero-ref    "spilled call-like call argument" <System.Collections.Immutable.ImmutableDictionary`2+MutationInput[System.String,System.String]>
-;  V27 tmp26        [V27    ] (  3,  1.50)  struct ( 8) [ebp-0x14]  do-not-enreg[XS] must-init addr-exposed ld-addr-op "Inline stloc first use temp" <System.Collections.Immutable.ImmutableDictionary`2+MutationResult[System.String,System.String]>
-;* V28 tmp27        [V28    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2+MutationInput[System.String,System.String]>
-;  V29 tmp28        [V29,T02] (  7,  7   )     ref  ->  esi         class-hnd exact single-def "impAppendStmt" <<unknown class>>
-;* V30 tmp29        [V30    ] (  0,  0   )     int  ->  zero-ref    "impAppendStmt"
-;  V31 tmp30        [V31,T11] (  5,  2.50)     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;  V32 tmp31        [V32,T20] (  2,  2   )     int  ->  edi         "Inlining Arg"
-;  V33 tmp32        [V33,T05] (  5,  5   )     ref  ->  [ebp-0x1C]  class-hnd exact spill-single-def "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;  V34 tmp33        [V34,T22] (  3,  1.50)     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
-;  V35 tmp34        [V35,T10] (  3,  3   )     ref  ->  edx         class-hnd exact single-def "Inlining Arg" <System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]>
-;* V36 tmp35        [V36    ] (  0,  0   )     ref  ->  zero-ref    "field V26._root (fldOffset=0x0)" P-INDEP
-;* V37 tmp36        [V37    ] (  0,  0   )     ref  ->  zero-ref    "field V26._comparers (fldOffset=0x4)" P-INDEP
-;  V38 tmp37        [V38    ] (  2,  1   )     ref  ->  [ebp-0x14]  do-not-enreg[X] addr-exposed "field V27._root (fldOffset=0x0)" P-DEP
-;  V39 tmp38        [V39    ] (  2,  1   )     int  ->  [ebp-0x10]  do-not-enreg[X] addr-exposed "field V27._countAdjustment (fldOffset=0x4)" P-DEP
-;  V40 tmp39        [V40,T27] (  2,  1   )     ref  ->  ecx         single-def "field V28._root (fldOffset=0x0)" P-INDEP
-;  V41 tmp40        [V41,T28] (  2,  1   )     ref  ->  edx         single-def "field V28._comparers (fldOffset=0x4)" P-INDEP
-;  V42 tmp41        [V42,T17] (  2,  2   )     ref  ->  ecx         single-def "argument with side effect"
-;  V43 tmp42        [V43,T18] (  2,  2   )     ref  ->  ecx         single-def "argument with side effect"
-;  V44 cse0         [V44,T23] (  3,  1.50)     ref  ->  edi         "CSE - conservative"
-;  V45 cse1         [V45,T14] (  4,  2   )     ref  ->  eax         "CSE - conservative"
-;  V46 cse2         [V46,T24] (  3,  1.50)     int  ->  ecx         "CSE - conservative"
+;  V14 tmp13        [V14,T23] (  3,  1.50)     ref  ->  esi         class-hnd "Inline return value spill temp" <<unknown class>>
+;  V15 tmp14        [V15,T18] (  2,  2   )     ref  ->  eax         class-hnd exact single-def "Inlining Arg" <System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]>
+;  V16 tmp15        [V16,T09] (  4,  4   )     ref  ->  [ebp-0x18]  class-hnd exact spill-single-def "Inlining Arg" <System.Collections.Immutable.SortedInt32KeyNode`1[System.Collections.Immutable.ImmutableDictionary`2+HashBucket[System.__Canon,System.__Canon]]>
+;  V17 tmp16        [V17,T21] (  2,  2   )     int  ->  edi         "Inlining Arg"
+;* V18 tmp17        [V18    ] (  0,  0   )     ref  ->  zero-ref    single-def
+;  V19 tmp18        [V19,T28] (  2,  1   )     ref  ->  esi        
+;* V20 tmp19        [V20    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "impAppendStmt" <<unknown class>>
+;* V21 tmp20        [V21    ] (  0,  0   )     ref  ->  zero-ref    single-def
+;  V22 tmp21        [V22,T15] (  4,  2   )     ref  ->  esi        
+;* V23 tmp22        [V23    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "impAppendStmt" <<unknown class>>
+;* V24 tmp23        [V24    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;* V25 tmp24        [V25    ] (  0,  0   )  struct ( 8) zero-ref    "spilled call-like call argument" <System.Collections.Immutable.ImmutableDictionary`2+MutationInput[System.String,System.String]>
+;  V26 tmp25        [V26    ] (  3,  1.50)  struct ( 8) [ebp-0x14]  do-not-enreg[XS] must-init addr-exposed ld-addr-op "Inline stloc first use temp" <System.Collections.Immutable.ImmutableDictionary`2+MutationResult[System.String,System.String]>
+;* V27 tmp26        [V27    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2+MutationInput[System.String,System.String]>
+;  V28 tmp27        [V28,T01] (  7,  7   )     ref  ->  esi         class-hnd exact single-def "impAppendStmt" <<unknown class>>
+;* V29 tmp28        [V29    ] (  0,  0   )     int  ->  zero-ref    "impAppendStmt"
+;  V30 tmp29        [V30,T13] (  5,  2.50)     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;  V31 tmp30        [V31,T22] (  2,  2   )     int  ->  edi         "Inlining Arg"
+;  V32 tmp31        [V32,T06] (  5,  5   )     ref  ->  [ebp-0x1C]  class-hnd exact spill-single-def "NewObj constructor temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;  V33 tmp32        [V33,T24] (  3,  1.50)     ref  ->  eax         class-hnd "Inline return value spill temp" <System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]>
+;  V34 tmp33        [V34,T12] (  3,  3   )     ref  ->  edx         class-hnd exact single-def "Inlining Arg" <System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]>
+;* V35 tmp34        [V35    ] (  0,  0   )     ref  ->  zero-ref    "field V25._root (fldOffset=0x0)" P-INDEP
+;* V36 tmp35        [V36    ] (  0,  0   )     ref  ->  zero-ref    "field V25._comparers (fldOffset=0x4)" P-INDEP
+;  V37 tmp36        [V37    ] (  2,  1   )     ref  ->  [ebp-0x14]  do-not-enreg[X] addr-exposed "field V26._root (fldOffset=0x0)" P-DEP
+;  V38 tmp37        [V38    ] (  2,  1   )     int  ->  [ebp-0x10]  do-not-enreg[X] addr-exposed "field V26._countAdjustment (fldOffset=0x4)" P-DEP
+;  V39 tmp38        [V39,T29] (  2,  1   )     ref  ->  ecx         single-def "field V27._root (fldOffset=0x0)" P-INDEP
+;  V40 tmp39        [V40,T30] (  2,  1   )     ref  ->  edx         single-def "field V27._comparers (fldOffset=0x4)" P-INDEP
+;  V41 tmp40        [V41,T19] (  2,  2   )     ref  ->  ecx         single-def "argument with side effect"
+;  V42 tmp41        [V42,T20] (  2,  2   )     ref  ->  ecx         single-def "argument with side effect"
+;  V43 cse0         [V43,T25] (  3,  1.50)     ref  ->  esi         "CSE - conservative"
+;  V44 cse1         [V44,T16] (  4,  2   )     ref  ->  eax         "CSE - conservative"
+;  V45 cse2         [V45,T26] (  3,  1.50)     int  ->  ecx         "CSE - conservative"
+;  V46 rat0         [V46,T03] (  4,  6.50)     ref  ->  edi         "replacement local"
+;  V47 rat1         [V47,T10] (  2,  4   )     int  ->  ecx         "CSE for expectedClsNode"
 ;
 ; Lcl frame size = 16
 
@@ -68,59 +69,72 @@ G_M57422_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        xor      eax, eax
        mov      dword ptr [ebp-0x14], eax
                        ;; size=14 bbWeight=1 PerfScore 5.75
-G_M57422_IG02:        ; bbWeight=1, gcrefRegs=00000002 {ecx}, byrefRegs=00000000 {}, byref
+G_M57422_IG02:        ; bbWeight=1, gcrefRegs=00000002 {ecx}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs +[ecx]
        mov      esi, gword ptr [ecx+0x0C]
        ; gcrRegs +[esi]
        test     esi, esi
-       je       G_M57422_IG15
-       cmp      dword ptr [esi], 0xD1FFAB1E
-       jne      G_M57422_IG13
-                       ;; size=23 bbWeight=1 PerfScore 7.25
-G_M57422_IG03:        ; bbWeight=0.50, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+       je       G_M57422_IG17
+       mov      edi, esi
+       ; gcrRegs +[edi]
+       mov      ecx, 0xD1FFAB1E      ; System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]
        ; gcrRegs -[ecx]
+       cmp      dword ptr [edi], ecx
+       je       SHORT G_M57422_IG04
+                       ;; size=22 bbWeight=1 PerfScore 7.75
+G_M57422_IG03:        ; bbWeight=0.25, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[edi]
+       xor      edi, edi
+       ; gcrRegs +[edi]
+                       ;; size=2 bbWeight=0.25 PerfScore 0.06
+G_M57422_IG04:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
+       test     edi, edi
+       je       G_M57422_IG15
+                       ;; size=8 bbWeight=1 PerfScore 1.25
+G_M57422_IG05:        ; bbWeight=0.50, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref, isz
+       ; gcrRegs -[esi]
        mov      ecx, gword ptr [D1FFAB1EH]      ; static handle
        ; gcrRegs +[ecx]
        mov      edx, gword ptr [D1FFAB1EH]      ; static handle
        ; gcrRegs +[edx]
-       mov      eax, gword ptr [esi+0x08]
+       mov      eax, gword ptr [edi+0x08]
        ; gcrRegs +[eax]
-       mov      edi, gword ptr [eax+0x04]
-       ; gcrRegs +[edi]
-       cmp      edi, ecx
-       jne      G_M57422_IG05
+       mov      esi, gword ptr [eax+0x04]
+       ; gcrRegs +[esi]
+       cmp      esi, ecx
+       jne      G_M57422_IG07
        cmp      gword ptr [eax+0x08], edx
-       jne      SHORT G_M57422_IG04
-       mov      eax, esi
-       jmp      G_M57422_IG12
+       jne      SHORT G_M57422_IG06
+       mov      eax, edi
+       jmp      G_M57422_IG14
                       ;; size=38 bbWeight=0.50 PerfScore 7.75
-G_M57422_IG04:        ; bbWeight=0.50, gcrefRegs=000000C5 {eax edx esi edi}, byrefRegs=00000000 {}, byref
+G_M57422_IG06:        ; bbWeight=0.50, gcrefRegs=000000C5 {eax edx esi edi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[ecx]
        cmp      byte  ptr [eax], al
        test     edx, edx
-       je       G_M57422_IG16
-       mov      ecx, edi
+       je       G_M57422_IG18
+       mov      ecx, esi
        ; gcrRegs +[ecx]
        push     0xD1FFAB1E
        call     [System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]:Get(System.Collections.Generic.IEqualityComparer`1[System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]]
-       ; gcrRegs -[ecx edx edi]
-       mov      edi, eax
-       ; gcrRegs +[edi]
+       ; gcrRegs -[ecx edx esi]
+       mov      esi, eax
+       ; gcrRegs +[esi]
        mov      ecx, 0xD1FFAB1E      ; System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]
-       call     CORINFO_HELP_NEWSFAST
+       call     CORINFO_HELP_NEWFAST_MAYBEFROZEN
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       mov      eax, gword ptr [esi+0x04]
+       mov      eax, gword ptr [edi+0x04]
        mov      gword ptr [ebp-0x18], eax
-       ; GC ptr vars +{V17}
-       mov      esi, dword ptr [esi+0x0C]
-       ; gcrRegs -[esi]
-       test     edi, edi
-       je       G_M57422_IG18
+       ; GC ptr vars +{V16}
+       mov      edi, dword ptr [edi+0x0C]
+       ; gcrRegs -[edi]
+       test     esi, esi
+       je       G_M57422_IG20
        lea      edx, bword ptr [ebx+0x08]
        ; byrRegs +[edx]
-       call     CORINFO_HELP_ASSIGN_REF_EDI
-       ; gcrRegs -[edi]
+       call     CORINFO_HELP_ASSIGN_REF_ESI
+       ; gcrRegs -[esi]
        ; byrRegs -[edx]
        mov      ecx, gword ptr [D1FFAB1EH]      ; static handle
        ; gcrRegs +[ecx]
@@ -130,7 +144,7 @@ G_M57422_IG04:        ; bbWeight=0.50, gcrefRegs=000000C5 {eax edx esi edi}, byr
        ; gcrRegs -[ecx]
        ; byrRegs -[edx]
        test     eax, eax
-       je       G_M57422_IG17
+       je       G_M57422_IG19
        mov      edx, gword ptr [D1FFAB1EH]      ; static handle
        ; gcrRegs +[edx]
        mov      ecx, eax
@@ -139,46 +153,46 @@ G_M57422_IG04:        ; bbWeight=0.50, gcrefRegs=000000C5 {eax edx esi edi}, byr
        ; gcrRegs -[eax ecx edx]
        lea      edx, bword ptr [ebx+0x04]
        ; byrRegs +[edx]
-       mov      edi, gword ptr [ebp-0x18]
-       ; gcrRegs +[edi]
-       ; GC ptr vars -{V17}
-       call     CORINFO_HELP_ASSIGN_REF_EDI
-       ; gcrRegs -[edi]
+       mov      esi, gword ptr [ebp-0x18]
+       ; gcrRegs +[esi]
+       ; GC ptr vars -{V16}
+       call     CORINFO_HELP_ASSIGN_REF_ESI
+       ; gcrRegs -[esi]
        ; byrRegs -[edx]
-       mov      dword ptr [ebx+0x0C], esi
+       mov      dword ptr [ebx+0x0C], edi
        mov      eax, ebx
        ; gcrRegs +[eax]
-       jmp      G_M57422_IG12
+       jmp      G_M57422_IG14
                       ;; size=119 bbWeight=0.50 PerfScore 16.88
-G_M57422_IG05:        ; bbWeight=0.50, gcrefRegs=00000046 {ecx edx esi}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs -[eax ebx] +[ecx edx esi]
+G_M57422_IG07:        ; bbWeight=0.50, gcrefRegs=00000086 {ecx edx edi}, byrefRegs=00000000 {}, byref, isz
+       ; gcrRegs -[eax ebx] +[ecx edx edi]
        push     0xD1FFAB1E
        call     [System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]:Get(System.Collections.Generic.IEqualityComparer`1[System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Immutable.ImmutableDictionary`2+Comparers[System.__Canon,System.__Canon]]
        ; gcrRegs -[ecx edx] +[eax]
-       mov      edi, eax
-       ; gcrRegs +[edi]
+       mov      esi, eax
+       ; gcrRegs +[esi]
        mov      ecx, 0xD1FFAB1E      ; System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]
-       call     CORINFO_HELP_NEWSFAST
+       call     CORINFO_HELP_NEWFAST_MAYBEFROZEN
        mov      ebx, eax
        ; gcrRegs +[ebx]
...

+6 (+2.76%) : 6009.dasm - System.Linq.Enumerable:gEnumerableToArray|296_0[System.ValueTuple`2[System.Canon,System.Canon]](System.Collections.Generic.IEnumerable1[System.ValueTuple2[System.Canon,System.Canon]]):System.ValueTuple`2[System.Canon,System.__Canon] 

@@ -8,12 +8,12 @@
 ; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 arg0         [V00,T05] (  3,  3   )     ref  ->  [ebp-0xE4]  class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
-;  V01 TypeCtx      [V01,T00] (  7,  5.56)     int  ->  ebx         single-def
+;  V00 arg0         [V00,T03] (  3,  3   )     ref  ->  [ebp-0xE4]  class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
+;  V01 TypeCtx      [V01,T00] (  8,  8   )     int  ->  ebx         single-def
 ;  V02 loc0         [V02    ] (  1,  1   )  struct (64) [ebp-0x50]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.ValueTuple`2[System.__Canon,System.__Canon]]>
 ;  V03 loc1         [V03    ] (  5,  5   )  struct (136) [ebp-0xD8]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
-;  V04 loc2         [V04,T12] (  2,  2   )     ref  ->  edi         class-hnd exact single-def <System.ValueTuple`2[System.__Canon,System.__Canon][]>
-;* V05 loc3         [V05    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V04 loc2         [V04,T07] (  2,  2   )     ref  ->  esi         class-hnd exact single-def <System.ValueTuple`2[System.__Canon,System.__Canon][]>
+;  V05 loc3         [V05,T04] (  2,  4   )     int  ->  edi         "spilling helperCall"
 ;* V06 tmp1         [V06    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V07 tmp2         [V07    ] (  3,  6   )  struct ( 8) [ebp-0xE0]  do-not-enreg[HS] must-init hidden-struct-arg "spilled call-like call argument" <System.Span`1[System.ValueTuple`2[System.__Canon,System.__Canon]]>
 ;* V08 tmp3         [V08    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
@@ -24,14 +24,8 @@
 ;  V13 tmp8         [V13,T02] (  3,  6   )     int  ->  [ebp-0xDC]  do-not-enreg[H] hidden-struct-arg "field V07._length (fldOffset=0x4)" P-DEP
 ;* V14 tmp9         [V14    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
 ;* V15 tmp10        [V15    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x4)" P-INDEP
-;  V16 tmp11        [V16,T10] (  2,  4   )     int  ->  edx         "argument with side effect"
-;  V17 tmp12        [V17,T11] (  2,  4   )     int  ->  edx         "argument with side effect"
-;  V18 cse0         [V18,T07] (  4,  4   )     int  ->  esi         "CSE - aggressive"
-;  V19 rat0         [V19,T08] (  3,  4   )     int  ->  eax         "runtime lookup"
-;  V20 rat1         [V20,T03] (  3,  5.60)     int  ->  eax         "fgMakeTemp is creating a new local variable"
-;  V21 rat2         [V21,T09] (  3,  4   )     int  ->  esi         "runtime lookup"
-;  V22 rat3         [V22,T04] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V23 rat4         [V23,T06] (  3,  4.48)     int  ->  esi         "fgMakeTemp is creating a new local variable"
+;  V16 tmp11        [V16,T05] (  2,  4   )     int  ->  edx         "argument with side effect"
+;  V17 tmp12        [V17,T06] (  2,  4   )     int  ->  edx         "argument with side effect"
 ;
 ; Lcl frame size = 216
 
@@ -52,25 +46,18 @@ G_M13440_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; GC ptr vars +{V00}
        mov      ebx, edx
                        ;; size=62 bbWeight=1 PerfScore 15.08
-G_M13440_IG02:        ; bbWeight=1, gcVars=00000020 {V00}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
-       mov      ecx, dword ptr [ebx+0x20]
-       mov      eax, dword ptr [ecx+0x08]
-       test     eax, eax
-       je       SHORT G_M13440_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M13440_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M13440_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M13440_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M13440_IG02:        ; bbWeight=1, gcVars=00000008 {V00}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M13440_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
+       call     CORINFO_HELP_MEMCPY
+       mov      edi, eax
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
        push     8
-       push     eax
-       lea      edx, [ebp-0x50]
+       push     edi
        lea      ecx, [ebp-0xE0]
+       lea      edx, [ebp-0x50]
        call     [<PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.ValueTuple`2[System.__Canon,System.__Canon]],System.ValueTuple`2[System.__Canon,System.__Canon]](byref,int):System.Span`1[System.ValueTuple`2[System.__Canon,System.__Canon]]]
        lea      edi, bword ptr [ebp-0x60]
        ; byrRegs +[edi]
@@ -82,47 +69,37 @@ G_M13440_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        lea      esi, bword ptr [ebp-0xE0]
        movsd    
        movsd    
-       mov      ecx, dword ptr [ebx+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M13440_IG08
-                       ;; size=49 bbWeight=1 PerfScore 18.00
-G_M13440_IG06:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       ; byrRegs -[esi edi]
-       mov      esi, dword ptr [ecx+0x0C]
-       test     esi, esi
-       je       SHORT G_M13440_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M13440_IG07:        ; bbWeight=0.64, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M13440_IG09
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M13440_IG08:        ; bbWeight=0.36, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      esi, eax
-                       ;; size=14 bbWeight=0.36 PerfScore 0.63
-G_M13440_IG09:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       push     esi
+       call     CORINFO_HELP_MEMCPY
+       ; byrRegs -[esi edi]
+       push     eax
        lea      ecx, [ebp-0xD8]
        mov      edx, gword ptr [ebp-0xE4]
        ; gcrRegs +[edx]
        ; GC ptr vars -{V00}
        call     [<unknown method>]
        ; gcrRegs -[edx]
-       mov      edx, esi
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      edx, eax
        lea      ecx, [ebp-0xD8]
        call     [System.Collections.Generic.SegmentedArrayBuilder`1[System.ValueTuple`2[System.__Canon,System.__Canon]]:ToArray():System.ValueTuple`2[System.__Canon,System.__Canon][]:this]
        ; gcrRegs +[eax]
-       mov      edi, eax
-       ; gcrRegs +[edi]
-       mov      edx, esi
+       mov      esi, eax
+       ; gcrRegs +[esi]
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
+       mov      edx, eax
        lea      ecx, [ebp-0xD8]
        call     [System.Collections.Generic.SegmentedArrayBuilder`1[System.ValueTuple`2[System.__Canon,System.__Canon]]:Dispose():this]
-       ; gcrRegs -[eax]
-       mov      eax, edi
+       mov      eax, esi
        ; gcrRegs +[eax]
-                        ;; size=51 bbWeight=1 PerfScore 13.50
-G_M13440_IG10:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=153 bbWeight=1 PerfScore 33.25
+G_M13440_IG03:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -131,6 +108,6 @@ G_M13440_IG10:        ; bbWeight=1, epilog, nogc, extend
        ret      
                        ;; size=8 bbWeight=1 PerfScore 3.50
 
-; Total bytes of code 217, prolog size 54, PerfScore 61.74, instruction count 64, allocated bytes for code 217 (MethodHash=1d88cb7f) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)
+; Total bytes of code 223, prolog size 54, PerfScore 51.83, instruction count 61, allocated bytes for code 223 (MethodHash=1d88cb7f) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)
 ; ============================================================

benchmarks.run_pgo.windows.x86.checked.mch

-26 (-34.67%) : 2373.dasm - System.Linq.Enumerable:DistinctSystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -19,26 +19,11 @@ G_M34864_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      gword ptr [ebp-0x08], ecx
        mov      dword ptr [ebp-0x0C], edx
                        ;; size=15 bbWeight=1 PerfScore 4.50
-G_M34864_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x08], 0
-       je       SHORT G_M34864_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M34864_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x08]
-       mov      dword ptr [ebp-0x10], eax
-       jmp      SHORT G_M34864_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M34864_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M34864_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x0C]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x10], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M34864_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        push     dword ptr [ebp-0x10]
        mov      ecx, gword ptr [ebp-0x08]
        ; gcrRegs +[ecx]
@@ -46,13 +31,13 @@ G_M34864_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; gcrRegs +[edx]
        call     [<unknown method>]
        ; gcrRegs -[ecx edx] +[eax]
-                       ;; size=14 bbWeight=1 PerfScore 5.25
-G_M34864_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=30 bbWeight=1 PerfScore 8.50
+G_M34864_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 75, prolog size 9, PerfScore 25.55, instruction count 26, allocated bytes for code 75 (MethodHash=c3d577cf) for method System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Instrumented Tier0)
+; Total bytes of code 49, prolog size 9, PerfScore 14.75, instruction count 17, allocated bytes for code 49 (MethodHash=c3d577cf) for method System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Instrumented Tier0)
 ; ============================================================

-26 (-34.67%) : 1624.dasm - System.Linq.Enumerable:DistinctSystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -19,26 +19,11 @@ G_M34864_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      gword ptr [ebp-0x08], ecx
        mov      dword ptr [ebp-0x0C], edx
                        ;; size=15 bbWeight=1 PerfScore 4.50
-G_M34864_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x08], 0
-       je       SHORT G_M34864_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M34864_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x08]
-       mov      dword ptr [ebp-0x10], eax
-       jmp      SHORT G_M34864_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M34864_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M34864_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x0C]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x10], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M34864_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        push     dword ptr [ebp-0x10]
        mov      ecx, gword ptr [ebp-0x08]
        ; gcrRegs +[ecx]
@@ -46,13 +31,13 @@ G_M34864_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; gcrRegs +[edx]
        call     [<unknown method>]
        ; gcrRegs -[ecx edx] +[eax]
-                       ;; size=14 bbWeight=1 PerfScore 5.25
-G_M34864_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=30 bbWeight=1 PerfScore 8.50
+G_M34864_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 75, prolog size 9, PerfScore 25.55, instruction count 26, allocated bytes for code 75 (MethodHash=c3d577cf) for method System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
+; Total bytes of code 49, prolog size 9, PerfScore 14.75, instruction count 17, allocated bytes for code 49 (MethodHash=c3d577cf) for method System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
 ; ============================================================

-26 (-34.21%) : 598.dasm - System.Linq.Enumerable:FirstOrDefaultSystem.__Canon:System.__Canon (Tier0) 

@@ -20,39 +20,24 @@ G_M56297_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      gword ptr [ebp-0x08], ecx
        mov      dword ptr [ebp-0x0C], edx
                        ;; size=15 bbWeight=1 PerfScore 4.50
-G_M56297_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x08], 0
-       je       SHORT G_M56297_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M56297_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x08]
-       mov      dword ptr [ebp-0x14], eax
-       jmp      SHORT G_M56297_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M56297_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M56297_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x0C]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x14], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M56297_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        push     dword ptr [ebp-0x14]
        lea      edx, [ebp-0x10]
        mov      ecx, gword ptr [ebp-0x08]
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx] +[eax]
-                       ;; size=15 bbWeight=1 PerfScore 5.50
-G_M56297_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=31 bbWeight=1 PerfScore 8.75
+G_M56297_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 76, prolog size 9, PerfScore 25.80, instruction count 26, allocated bytes for code 76 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier0)
+; Total bytes of code 50, prolog size 9, PerfScore 15.00, instruction count 17, allocated bytes for code 50 (MethodHash=51852416) for method System.Linq.Enumerable:FirstOrDefault[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon (Tier0)
 ; ============================================================

-2 (-0.62%) : 13452.dasm - System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.Canon]:GetListByName(uint,int,uint,int,int,int):System.Canon[]:this (Tier1) 

@@ -9,26 +9,26 @@
 ; 0 inlinees with PGO data; 4 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T01] ( 10,  4   )     ref  ->  esi         this class-hnd single-def <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
-;  V01 arg1         [V01,T04] (  3,  2.07)     int  ->  edx         single-def
+;  V00 this         [V00,T00] ( 10,  4   )     ref  ->  esi         this class-hnd single-def <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
+;  V01 arg1         [V01,T03] (  3,  2.07)     int  ->  edx         single-def
 ;  V02 arg2         [V02,T11] (  2,  1.07)     int  ->  ecx         single-def
 ;  V03 arg3         [V03,T12] (  2,  1.07)     int  ->  ebx         single-def
 ;  V04 arg4         [V04,T13] (  2,  1.07)     int  ->  [ebp+0x10]  single-def
 ;  V05 arg5         [V05,T14] (  1,  1   )     int  ->  [ebp+0x0C]  single-def
 ;  V06 arg6         [V06,T08] (  2,  2   )     int  ->  edi         single-def
-;  V07 loc0         [V07,T05] ( 10,  4   )  struct (12) [ebp-0x18]  do-not-enreg[SF] ld-addr-op <System.RuntimeType+RuntimeTypeCache+Filter>
-;  V08 loc1         [V08,T07] ( 10,  3.25)     ref  ->  ebx         class-hnd <<unknown class>>
-;  V09 tmp0         [V09,T06] (  4,  3.50)     int  ->  edx         "spilling helperCall"
-;* V10 tmp1         [V10    ] (  0,  0   )     int  ->  zero-ref    "fgMakeTemp is creating a new local variable"
-;  V11 tmp2         [V11,T00] (  5,  7.50)     ref  ->  eax         class-hnd "spilling QMark2" <System.__Canon[]>
-;  V12 tmp3         [V12,T15] (  2,  0.27)     ref  ->  eax         class-hnd exact single-def "spilling ret_expr" <System.Text.UTF8Encoding+UTF8EncodingSealed>
-;* V13 tmp4         [V13    ] (  0,  0   )     int  ->  zero-ref    "guarded devirt return temp"
-;* V14 tmp5         [V14    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.Text.UTF8Encoding+UTF8EncodingSealed>
-;* V15 tmp6         [V15    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.MdUtf8String>
-;  V16 tmp7         [V16,T09] (  2,  2   )     int  ->  ebx         "field V15.m_pStringHeap (fldOffset=0x0)" P-INDEP
-;  V17 tmp8         [V17,T10] (  2,  2   )     int  ->  eax         "field V15.m_StringHeapByteLength (fldOffset=0x4)" P-INDEP
-;  V18 rat0         [V18,T03] (  3,  4.40)     int  ->  ecx         "Spilling to split statement for tree"
-;  V19 rat1         [V19,T02] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V07 loc0         [V07,T04] ( 10,  4   )  struct (12) [ebp-0x18]  do-not-enreg[SF] ld-addr-op <System.RuntimeType+RuntimeTypeCache+Filter>
+;  V08 loc1         [V08,T07] (  9,  3.00)     ref  ->  ebx         class-hnd <<unknown class>>
+;* V09 tmp0         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V10 tmp1         [V10,T15] (  2,  0.27)     ref  ->  eax         class-hnd exact single-def "spilling ret_expr" <System.Text.UTF8Encoding+UTF8EncodingSealed>
+;* V11 tmp2         [V11    ] (  0,  0   )     int  ->  zero-ref    "guarded devirt return temp"
+;* V12 tmp3         [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.Text.UTF8Encoding+UTF8EncodingSealed>
+;* V13 tmp4         [V13    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.MdUtf8String>
+;  V14 tmp5         [V14,T09] (  2,  2   )     int  ->  ebx         "field V13.m_pStringHeap (fldOffset=0x0)" P-INDEP
+;  V15 tmp6         [V15,T10] (  2,  2   )     int  ->  eax         "field V13.m_StringHeapByteLength (fldOffset=0x4)" P-INDEP
+;  V16 tmp7         [V16,T06] (  2,  4   )     int  ->  ecx         "argument with side effect"
+;  V17 rat0         [V17,T02] (  3,  4.40)     int  ->  ecx         "Spilling to split statement for tree"
+;  V18 rat1         [V18,T05] (  3,  4   )     int  ->  ecx         "runtime lookup"
+;  V19 rat2         [V19,T01] (  3,  5.60)     int  ->  eax         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 12
 
@@ -45,10 +45,10 @@ G_M33863_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      ebx, dword ptr [ebp+0x14]
        mov      edi, dword ptr [ebp+0x08]
                        ;; size=20 bbWeight=1 PerfScore 7.75
-G_M33863_IG02:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG02:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        test     ecx, ecx
-       jne      SHORT G_M33863_IG07
-                       ;; size=4 bbWeight=1 PerfScore 1.25
+       jne      G_M33863_IG11
+                       ;; size=8 bbWeight=1 PerfScore 1.25
 G_M33863_IG03:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        mov      eax, dword ptr [ebp+0x10]
        mov      dword ptr [ebp-0x18], ebx
@@ -58,7 +58,7 @@ G_M33863_IG03:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000
        xor      ebx, ebx
        ; gcrRegs +[ebx]
        cmp      edi, 6
-       ja       G_M33863_IG19
+       ja       G_M33863_IG16
        lea      ecx, [@RWD00]
        mov      ecx, dword ptr [ecx+4*edi]
        lea      eax, G_M33863_IG02
@@ -67,45 +67,16 @@ G_M33863_IG03:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000
                        ;; size=45 bbWeight=1 PerfScore 12.25
 G_M33863_IG04:        ; bbWeight=0.20, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_CLASS
-       mov      edx, eax
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M33863_IG05:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, ebx
-       ; gcrRegs +[eax]
-       test     eax, eax
-       je       SHORT G_M33863_IG10
-                       ;; size=6 bbWeight=1 PerfScore 1.50
-G_M33863_IG06:        ; bbWeight=0.50, gcrefRegs=00000049 {eax ebx esi}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M33863_IG08
-                       ;; size=2 bbWeight=0.50 PerfScore 1.00
-G_M33863_IG07:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs -[eax ebx]
-       mov      eax, gword ptr [D1FFAB1EH]      ; static handle
-       ; gcrRegs +[eax]
-       push     ecx
-       push     ebx
-       push     dword ptr [ebp+0x10]
+       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD_LOG
        mov      ecx, eax
-       ; gcrRegs +[ecx]
-       call     [System.Text.UTF8Encoding:GetBytes(uint,int,uint,int):int:this]
-       ; gcrRegs -[eax ecx]
-       jmp      SHORT G_M33863_IG03
-                       ;; size=20 bbWeight=0.07 PerfScore 0.68
-G_M33863_IG08:        ; bbWeight=0.50, gcrefRegs=00000049 {eax ebx esi}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs +[eax ebx]
-       cmp      dword ptr [eax], edx
-       je       SHORT G_M33863_IG10
-                       ;; size=4 bbWeight=0.50 PerfScore 2.00
-G_M33863_IG09:        ; bbWeight=0.25, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[eax]
-       mov      ecx, edx
+                     ;; size=12 bbWeight=0.20 PerfScore 0.30
+G_M33863_IG05:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      edx, ebx
        ; gcrRegs +[edx]
-       call     CORINFO_HELP_CHKCASTARRAY
+       call     CORINFO_HELP_CHKCASTINTERFACE
        ; gcrRegs -[edx ebx] +[eax]
-                      ;; size=9 bbWeight=0.25 PerfScore 0.38
-G_M33863_IG10:        ; bbWeight=1, gcrefRegs=00000041 {eax esi}, byrefRegs=00000000 {}, byref, epilog, nogc
+                     ;; size=7 bbWeight=1 PerfScore 1.25
+G_M33863_IG06:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -113,19 +84,20 @@ G_M33863_IG10:        ; bbWeight=1, gcrefRegs=00000041 {eax esi}, byrefRegs=0000
        pop      ebp
        ret      20
                        ;; size=10 bbWeight=1 PerfScore 4.50
-G_M33863_IG11:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M33863_IG07:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs -[eax] +[ebx]
        mov      ecx, dword ptr [esi]
        mov      edx, dword ptr [ecx+0x24]
        mov      edx, dword ptr [edx]
-       mov      edx, dword ptr [edx+0x0C]
-       test     edx, edx
+       mov      eax, dword ptr [edx+0x0C]
+       test     eax, eax
        je       SHORT G_M33863_IG04
                        ;; size=14 bbWeight=1 PerfScore 9.25
-G_M33863_IG12:        ; bbWeight=0.80, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG08:        ; bbWeight=0.80, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       mov      ecx, eax
        jmp      SHORT G_M33863_IG05
-                      ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M33863_IG13:        ; bbWeight=0.53, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+                       ;; size=4 bbWeight=0.80 PerfScore 1.80
+G_M33863_IG09:        ; bbWeight=0.53, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -136,9 +108,9 @@ G_M33863_IG13:        ; bbWeight=0.53, gcrefRegs=00000040 {esi}, byrefRegs=00000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0.53 PerfScore 4.53
-G_M33863_IG14:        ; bbWeight=0.40, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG10:        ; bbWeight=0.40, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[eax ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -149,10 +121,22 @@ G_M33863_IG14:        ; bbWeight=0.40, gcrefRegs=00000040 {esi}, byrefRegs=00000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0.40 PerfScore 3.40
-G_M33863_IG15:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG11:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax ebx]
+       mov      eax, gword ptr [D1FFAB1EH]      ; static handle
+       ; gcrRegs +[eax]
+       push     ecx
+       push     ebx
+       push     dword ptr [ebp+0x10]
+       mov      ecx, eax
+       ; gcrRegs +[ecx]
+       call     [System.Text.UTF8Encoding:GetBytes(uint,int,uint,int):int:this]
+       ; gcrRegs -[eax ecx]
+       jmp      G_M33863_IG03
+                       ;; size=23 bbWeight=0.07 PerfScore 0.68
+G_M33863_IG12:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
        push     dword ptr [ebp-0x18]
@@ -162,9 +146,9 @@ G_M33863_IG15:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0.07 PerfScore 0.57
-G_M33863_IG16:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG13:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[eax ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -175,9 +159,9 @@ G_M33863_IG16:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0 PerfScore 0.00
-G_M33863_IG17:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG14:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -188,22 +172,22 @@ G_M33863_IG17:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
-                       ;; size=21 bbWeight=0 PerfScore 0.00
-G_M33863_IG18:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[eax ebx]
-       push     dword ptr [ebp-0x10]
-       push     dword ptr [ebp-0x14]
-       push     dword ptr [ebp-0x18]
-       mov      ecx, esi
-       ; gcrRegs +[ecx]
-       call     [<unknown method>]
-       ; gcrRegs -[ecx] +[eax]
-       mov      ebx, eax
-       ; gcrRegs +[ebx]
-       jmp      G_M33863_IG11
+       jmp      G_M33863_IG07
                        ;; size=24 bbWeight=0 PerfScore 0.00
-G_M33863_IG19:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
+G_M33863_IG15:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[eax ebx]
+       push     dword ptr [ebp-0x10]
+       push     dword ptr [ebp-0x14]
+       push     dword ptr [ebp-0x18]
+       mov      ecx, esi
+       ; gcrRegs +[ecx]
+       call     [<unknown method>]
+       ; gcrRegs -[ecx] +[eax]
+       mov      ebx, eax
+       ; gcrRegs +[ebx]
+       jmp      G_M33863_IG07
+                       ;; size=24 bbWeight=0 PerfScore 0.00
+G_M33863_IG16:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax]
        mov      ecx, 0xD1FFAB1E
        ; gcrRegs +[ecx]
@@ -211,9 +195,9 @@ G_M33863_IG19:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=0000
        ; gcrRegs +[edx]
        call     [<unknown method>]
        ; gcrRegs -[ecx edx]
-       jmp      G_M33863_IG11
+       jmp      G_M33863_IG07
                       ;; size=21 bbWeight=0 PerfScore 0.00
...

-2 (-0.62%) : 14308.dasm - System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.Canon]:GetListByName(uint,int,uint,int,int,int):System.Canon[]:this (Tier1) 

@@ -9,26 +9,26 @@
 ; 0 inlinees with PGO data; 4 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T01] ( 10,  4   )     ref  ->  esi         this class-hnd single-def <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
-;  V01 arg1         [V01,T04] (  3,  2.07)     int  ->  edx         single-def
+;  V00 this         [V00,T00] ( 10,  4   )     ref  ->  esi         this class-hnd single-def <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
+;  V01 arg1         [V01,T03] (  3,  2.07)     int  ->  edx         single-def
 ;  V02 arg2         [V02,T11] (  2,  1.07)     int  ->  ecx         single-def
 ;  V03 arg3         [V03,T12] (  2,  1.07)     int  ->  ebx         single-def
 ;  V04 arg4         [V04,T13] (  2,  1.07)     int  ->  [ebp+0x10]  single-def
 ;  V05 arg5         [V05,T14] (  1,  1   )     int  ->  [ebp+0x0C]  single-def
 ;  V06 arg6         [V06,T08] (  2,  2   )     int  ->  edi         single-def
-;  V07 loc0         [V07,T05] ( 10,  4   )  struct (12) [ebp-0x18]  do-not-enreg[SF] ld-addr-op <System.RuntimeType+RuntimeTypeCache+Filter>
-;  V08 loc1         [V08,T07] ( 10,  3.25)     ref  ->  ebx         class-hnd <<unknown class>>
-;  V09 tmp0         [V09,T06] (  4,  3.50)     int  ->  edx         "spilling helperCall"
-;* V10 tmp1         [V10    ] (  0,  0   )     int  ->  zero-ref    "fgMakeTemp is creating a new local variable"
-;  V11 tmp2         [V11,T00] (  5,  7.50)     ref  ->  eax         class-hnd "spilling QMark2" <System.__Canon[]>
-;  V12 tmp3         [V12,T15] (  2,  0.27)     ref  ->  eax         class-hnd exact single-def "spilling ret_expr" <System.Text.UTF8Encoding+UTF8EncodingSealed>
-;* V13 tmp4         [V13    ] (  0,  0   )     int  ->  zero-ref    "guarded devirt return temp"
-;* V14 tmp5         [V14    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.Text.UTF8Encoding+UTF8EncodingSealed>
-;* V15 tmp6         [V15    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.MdUtf8String>
-;  V16 tmp7         [V16,T09] (  2,  2   )     int  ->  ebx         "field V15.m_pStringHeap (fldOffset=0x0)" P-INDEP
-;  V17 tmp8         [V17,T10] (  2,  2   )     int  ->  eax         "field V15.m_StringHeapByteLength (fldOffset=0x4)" P-INDEP
-;  V18 rat0         [V18,T03] (  3,  4.40)     int  ->  ecx         "Spilling to split statement for tree"
-;  V19 rat1         [V19,T02] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V07 loc0         [V07,T04] ( 10,  4   )  struct (12) [ebp-0x18]  do-not-enreg[SF] ld-addr-op <System.RuntimeType+RuntimeTypeCache+Filter>
+;  V08 loc1         [V08,T07] (  9,  3.00)     ref  ->  ebx         class-hnd <<unknown class>>
+;* V09 tmp0         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V10 tmp1         [V10,T15] (  2,  0.27)     ref  ->  eax         class-hnd exact single-def "spilling ret_expr" <System.Text.UTF8Encoding+UTF8EncodingSealed>
+;* V11 tmp2         [V11    ] (  0,  0   )     int  ->  zero-ref    "guarded devirt return temp"
+;* V12 tmp3         [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.Text.UTF8Encoding+UTF8EncodingSealed>
+;* V13 tmp4         [V13    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.MdUtf8String>
+;  V14 tmp5         [V14,T09] (  2,  2   )     int  ->  ebx         "field V13.m_pStringHeap (fldOffset=0x0)" P-INDEP
+;  V15 tmp6         [V15,T10] (  2,  2   )     int  ->  eax         "field V13.m_StringHeapByteLength (fldOffset=0x4)" P-INDEP
+;  V16 tmp7         [V16,T06] (  2,  4   )     int  ->  ecx         "argument with side effect"
+;  V17 rat0         [V17,T02] (  3,  4.40)     int  ->  ecx         "Spilling to split statement for tree"
+;  V18 rat1         [V18,T05] (  3,  4   )     int  ->  ecx         "runtime lookup"
+;  V19 rat2         [V19,T01] (  3,  5.60)     int  ->  eax         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 12
 
@@ -45,10 +45,10 @@ G_M33863_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      ebx, dword ptr [ebp+0x14]
        mov      edi, dword ptr [ebp+0x08]
                        ;; size=20 bbWeight=1 PerfScore 7.75
-G_M33863_IG02:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG02:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        test     ecx, ecx
-       jne      SHORT G_M33863_IG07
-                       ;; size=4 bbWeight=1 PerfScore 1.25
+       jne      G_M33863_IG11
+                       ;; size=8 bbWeight=1 PerfScore 1.25
 G_M33863_IG03:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        mov      eax, dword ptr [ebp+0x10]
        mov      dword ptr [ebp-0x18], ebx
@@ -58,7 +58,7 @@ G_M33863_IG03:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000
        xor      ebx, ebx
        ; gcrRegs +[ebx]
        cmp      edi, 6
-       ja       G_M33863_IG19
+       ja       G_M33863_IG16
        lea      ecx, [@RWD00]
        mov      ecx, dword ptr [ecx+4*edi]
        lea      eax, G_M33863_IG02
@@ -67,45 +67,16 @@ G_M33863_IG03:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000000
                        ;; size=45 bbWeight=1 PerfScore 12.25
 G_M33863_IG04:        ; bbWeight=0.20, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_CLASS
-       mov      edx, eax
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M33863_IG05:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, ebx
-       ; gcrRegs +[eax]
-       test     eax, eax
-       je       SHORT G_M33863_IG10
-                       ;; size=6 bbWeight=1 PerfScore 1.50
-G_M33863_IG06:        ; bbWeight=0.50, gcrefRegs=00000049 {eax ebx esi}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M33863_IG08
-                       ;; size=2 bbWeight=0.50 PerfScore 1.00
-G_M33863_IG07:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs -[eax ebx]
-       mov      eax, gword ptr [D1FFAB1EH]      ; static handle
-       ; gcrRegs +[eax]
-       push     ecx
-       push     ebx
-       push     dword ptr [ebp+0x10]
+       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD_LOG
        mov      ecx, eax
-       ; gcrRegs +[ecx]
-       call     [System.Text.UTF8Encoding:GetBytes(uint,int,uint,int):int:this]
-       ; gcrRegs -[eax ecx]
-       jmp      SHORT G_M33863_IG03
-                       ;; size=20 bbWeight=0.07 PerfScore 0.68
-G_M33863_IG08:        ; bbWeight=0.50, gcrefRegs=00000049 {eax ebx esi}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs +[eax ebx]
-       cmp      dword ptr [eax], edx
-       je       SHORT G_M33863_IG10
-                       ;; size=4 bbWeight=0.50 PerfScore 2.00
-G_M33863_IG09:        ; bbWeight=0.25, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[eax]
-       mov      ecx, edx
+                     ;; size=12 bbWeight=0.20 PerfScore 0.30
+G_M33863_IG05:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      edx, ebx
        ; gcrRegs +[edx]
-       call     CORINFO_HELP_CHKCASTARRAY
+       call     CORINFO_HELP_CHKCASTINTERFACE
        ; gcrRegs -[edx ebx] +[eax]
-                      ;; size=9 bbWeight=0.25 PerfScore 0.38
-G_M33863_IG10:        ; bbWeight=1, gcrefRegs=00000041 {eax esi}, byrefRegs=00000000 {}, byref, epilog, nogc
+                     ;; size=7 bbWeight=1 PerfScore 1.25
+G_M33863_IG06:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -113,19 +84,20 @@ G_M33863_IG10:        ; bbWeight=1, gcrefRegs=00000041 {eax esi}, byrefRegs=0000
        pop      ebp
        ret      20
                        ;; size=10 bbWeight=1 PerfScore 4.50
-G_M33863_IG11:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M33863_IG07:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs -[eax] +[ebx]
        mov      ecx, dword ptr [esi]
        mov      edx, dword ptr [ecx+0x24]
        mov      edx, dword ptr [edx]
-       mov      edx, dword ptr [edx+0x0C]
-       test     edx, edx
+       mov      eax, dword ptr [edx+0x0C]
+       test     eax, eax
        je       SHORT G_M33863_IG04
                        ;; size=14 bbWeight=1 PerfScore 9.25
-G_M33863_IG12:        ; bbWeight=0.80, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG08:        ; bbWeight=0.80, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       mov      ecx, eax
        jmp      SHORT G_M33863_IG05
-                      ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M33863_IG13:        ; bbWeight=0.53, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+                       ;; size=4 bbWeight=0.80 PerfScore 1.80
+G_M33863_IG09:        ; bbWeight=0.53, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -136,9 +108,9 @@ G_M33863_IG13:        ; bbWeight=0.53, gcrefRegs=00000040 {esi}, byrefRegs=00000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0.53 PerfScore 4.53
-G_M33863_IG14:        ; bbWeight=0.40, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG10:        ; bbWeight=0.40, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[eax ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -149,10 +121,22 @@ G_M33863_IG14:        ; bbWeight=0.40, gcrefRegs=00000040 {esi}, byrefRegs=00000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0.40 PerfScore 3.40
-G_M33863_IG15:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG11:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax ebx]
+       mov      eax, gword ptr [D1FFAB1EH]      ; static handle
+       ; gcrRegs +[eax]
+       push     ecx
+       push     ebx
+       push     dword ptr [ebp+0x10]
+       mov      ecx, eax
+       ; gcrRegs +[ecx]
+       call     [System.Text.UTF8Encoding:GetBytes(uint,int,uint,int):int:this]
+       ; gcrRegs -[eax ecx]
+       jmp      G_M33863_IG03
+                       ;; size=23 bbWeight=0.07 PerfScore 0.68
+G_M33863_IG12:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
        push     dword ptr [ebp-0x18]
@@ -162,9 +146,9 @@ G_M33863_IG15:        ; bbWeight=0.07, gcrefRegs=00000040 {esi}, byrefRegs=00000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0.07 PerfScore 0.57
-G_M33863_IG16:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG13:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[eax ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -175,9 +159,9 @@ G_M33863_IG16:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
+       jmp      SHORT G_M33863_IG07
                       ;; size=21 bbWeight=0 PerfScore 0.00
-G_M33863_IG17:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+G_M33863_IG14:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax ebx]
        push     dword ptr [ebp-0x10]
        push     dword ptr [ebp-0x14]
@@ -188,22 +172,22 @@ G_M33863_IG17:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000
        ; gcrRegs -[ecx] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      SHORT G_M33863_IG11
-                       ;; size=21 bbWeight=0 PerfScore 0.00
-G_M33863_IG18:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[eax ebx]
-       push     dword ptr [ebp-0x10]
-       push     dword ptr [ebp-0x14]
-       push     dword ptr [ebp-0x18]
-       mov      ecx, esi
-       ; gcrRegs +[ecx]
-       call     [<unknown method>]
-       ; gcrRegs -[ecx] +[eax]
-       mov      ebx, eax
-       ; gcrRegs +[ebx]
-       jmp      G_M33863_IG11
+       jmp      G_M33863_IG07
                        ;; size=24 bbWeight=0 PerfScore 0.00
-G_M33863_IG19:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
+G_M33863_IG15:        ; bbWeight=0, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[eax ebx]
+       push     dword ptr [ebp-0x10]
+       push     dword ptr [ebp-0x14]
+       push     dword ptr [ebp-0x18]
+       mov      ecx, esi
+       ; gcrRegs +[ecx]
+       call     [<unknown method>]
+       ; gcrRegs -[ecx] +[eax]
+       mov      ebx, eax
+       ; gcrRegs +[ebx]
+       jmp      G_M33863_IG07
+                       ;; size=24 bbWeight=0 PerfScore 0.00
+G_M33863_IG16:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax]
        mov      ecx, 0xD1FFAB1E
        ; gcrRegs +[ecx]
@@ -211,9 +195,9 @@ G_M33863_IG19:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=0000
        ; gcrRegs +[edx]
        call     [<unknown method>]
        ; gcrRegs -[ecx edx]
-       jmp      G_M33863_IG11
+       jmp      G_M33863_IG07
                       ;; size=21 bbWeight=0 PerfScore 0.00
...

+9 (+2.82%) : 4813.dasm - Jil.Common.ExtensionMethods+<>cDisplayClass65_0:b0(System.Type):ubyte:this (Tier1) 

@@ -5,36 +5,37 @@
 ; optimized using Dynamic PGO
 ; ebp based frame
 ; partially interruptible
-; with Dynamic PGO: edge weights are invalid, and fgCalledCount is 50
+; with Dynamic PGO: edge weights are valid, and fgCalledCount is 50
 ; 7 inlinees with PGO data; 7 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  2.34)     ref  ->  edi         this class-hnd single-def <Jil.Common.ExtensionMethods+<>c__DisplayClass65_0>
 ;  V01 arg1         [V01,T00] (  9,  4.68)     ref  ->  esi         class-hnd single-def <System.Type>
-;  V02 tmp0         [V02,T13] (  7,  1.35)     ref  ->  ebx         "guarded devirt return temp"
+;  V02 tmp0         [V02,T14] (  7,  1.35)     ref  ->  ebx         "guarded devirt return temp"
 ;* V03 tmp1         [V03    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "guarded devirt this exact temp" <System.RuntimeType>
 ;* V04 tmp2         [V04    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "spilling ret_expr" <System.Reflection.TypeInfo>
-;  V05 tmp3         [V05,T09] (  3,  2   )     int  ->  eax         "guarded devirt return temp"
+;  V05 tmp3         [V05,T10] (  3,  2   )     int  ->  eax         "guarded devirt return temp"
 ;* V06 tmp4         [V06    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def "guarded devirt this exact temp" <System.RuntimeType>
 ;  V07 tmp5         [V07,T02] (  7,  4   )     ref  ->  ecx         class-hnd "Inline return value spill temp" <System.Reflection.TypeInfo>
 ;  V08 tmp6         [V08,T03] (  5,  4   )     ref  ->  ecx         class-hnd single-def "Inline stloc first use temp" <System.Reflection.IReflectableType>
-;  V09 tmp7         [V09,T16] (  3,  0   )     ref  ->  ebx         class-hnd exact single-def "NewObj constructor temp" <System.Reflection.TypeDelegator>
-;  V10 tmp8         [V10,T08] (  3,  2   )     ref  ->  ecx         "guarded devirt return temp"
+;  V09 tmp7         [V09,T17] (  3,  0   )     ref  ->  ebx         class-hnd exact single-def "NewObj constructor temp" <System.Reflection.TypeDelegator>
+;  V10 tmp8         [V10,T09] (  3,  2   )     ref  ->  ecx         "guarded devirt return temp"
 ;* V11 tmp9         [V11    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def "guarded devirt this exact temp" <System.RuntimeType>
 ;* V12 tmp10        [V12    ] (  0,  0   )  struct ( 4) zero-ref    ld-addr-op "Inline stloc first use temp" <System.Runtime.CompilerServices.TypeHandle>
-;  V13 tmp11        [V13,T10] (  3,  2   )     int  ->  ebx        
-;  V14 tmp12        [V14,T12] (  2,  2   )   ubyte  ->  eax         "Inline stloc first use temp"
+;  V13 tmp11        [V13,T11] (  3,  2   )     int  ->  ebx        
+;  V14 tmp12        [V14,T13] (  2,  2   )   ubyte  ->  eax         "Inline stloc first use temp"
 ;* V15 tmp13        [V15    ] (  0,  0   )  struct ( 4) zero-ref    ld-addr-op "NewObj constructor temp" <System.Runtime.CompilerServices.TypeHandle>
 ;* V16 tmp14        [V16    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V17 tmp15        [V17    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;  V18 tmp16        [V18,T11] (  3,  2   )   ubyte  ->  ebx         "Inline return value spill temp"
+;  V18 tmp16        [V18,T12] (  3,  2   )   ubyte  ->  ebx         "Inline return value spill temp"
 ;  V19 tmp17        [V19,T04] (  2,  4   )   byref  ->  eax         single-def "Inlining Arg"
-;  V20 tmp18        [V20,T15] (  4,  0.68)   ubyte  ->  eax         "Inline return value spill temp"
-;  V21 tmp19        [V21,T07] (  5,  2.03)     ref  ->  edi         class-hnd single-def "Inlining Arg" <System.Type>
-;* V22 tmp20        [V22,T14] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling QMark2" <System.RuntimeType>
-;* V23 tmp21        [V23    ] (  0,  0   )     int  ->  zero-ref    "field V12.m_asTAddr (fldOffset=0x0)" P-INDEP
-;  V24 tmp22        [V24,T05] (  3,  3   )     int  ->  eax         "field V15.m_asTAddr (fldOffset=0x0)" P-INDEP
-;  V25 cse0         [V25,T06] (  3,  3   )     int  ->  eax         "CSE - moderate"
+;  V20 tmp18        [V20,T16] (  4,  0.68)   ubyte  ->  eax         "Inline return value spill temp"
+;  V21 tmp19        [V21,T08] (  5,  2.03)     ref  ->  edi         class-hnd single-def "Inlining Arg" <System.Type>
+;* V22 tmp20        [V22    ] (  0,  0   )     int  ->  zero-ref    "field V12.m_asTAddr (fldOffset=0x0)" P-INDEP
+;  V23 tmp21        [V23,T05] (  3,  3   )     int  ->  eax         "field V15.m_asTAddr (fldOffset=0x0)" P-INDEP
+;  V24 cse0         [V24,T06] (  3,  3   )     int  ->  eax         "CSE - moderate"
+;  V25 rat0         [V25,T07] (  4,  2.19)     ref  ->  eax         "replacement local"
+;  V26 rat1         [V26,T15] (  2,  1.35)     int  ->  ecx         "CSE for expectedClsNode"
 ;
 ; Lcl frame size = 0
 
@@ -51,29 +52,29 @@ G_M39562_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
                        ;; size=10 bbWeight=1 PerfScore 4.75
 G_M39562_IG02:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
        test     esi, esi
-       je       G_M39562_IG14
+       je       G_M39562_IG16
        mov      edx, esi
        ; gcrRegs +[edx]
        mov      ecx, 0xD1FFAB1E      ; System.Reflection.IReflectableType
-       call     CORINFO_HELP_ISINSTANCEOFINTERFACE
+       call     CORINFO_HELP_INITINSTCLASS
        ; gcrRegs -[edx] +[eax]
        mov      ecx, eax
        ; gcrRegs +[ecx]
        test     ecx, ecx
-       je       G_M39562_IG16
+       je       G_M39562_IG18
        cmp      dword ptr [ecx], 0xD1FFAB1E
-       jne      G_M39562_IG15
+       jne      G_M39562_IG17
                         ;; size=42 bbWeight=1 PerfScore 8.25
 G_M39562_IG03:        ; bbWeight=1, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax]
        cmp      dword ptr [ecx], 0xD1FFAB1E
-       jne      G_M39562_IG19
+       jne      G_M39562_IG21
        mov      eax, dword ptr [ecx+0x0C]
        test     al, 2
-       jne      G_M39562_IG18
+       jne      G_M39562_IG20
        mov      eax, dword ptr [eax]
        test     eax, 0xD1FFAB1E
-       jne      G_M39562_IG17
+       jne      G_M39562_IG19
        xor      ebx, ebx
        test     al, 48
        setne    bl
@@ -84,11 +85,23 @@ G_M39562_IG04:        ; bbWeight=1, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=
 G_M39562_IG05:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[ecx]
        test     eax, eax
-       je       SHORT G_M39562_IG11
+       jne      SHORT G_M39562_IG08
                      ;; size=4 bbWeight=1 PerfScore 1.25
-G_M39562_IG06:        ; bbWeight=0.34, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
+G_M39562_IG06:        ; bbWeight=0.66, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[esi edi]
+       xor      eax, eax
+                       ;; size=2 bbWeight=0.66 PerfScore 0.17
+G_M39562_IG07:        ; bbWeight=0.66, epilog, nogc, extend
+       pop      ebx
+       pop      esi
+       pop      edi
+       pop      ebp
+       ret      
+                       ;; size=5 bbWeight=0.66 PerfScore 1.98
+G_M39562_IG08:        ; bbWeight=0.34, gcVars=00000000 {}, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, gcvars, byref
+       ; gcrRegs +[esi edi]
        cmp      dword ptr [esi], 0xD1FFAB1E
-       jne      G_M39562_IG20
+       jne      G_M39562_IG22
        mov      ecx, esi
        ; gcrRegs +[ecx]
        call     [System.RuntimeType:GetGenericTypeDefinition():System.Type:this]
@@ -96,49 +109,51 @@ G_M39562_IG06:        ; bbWeight=0.34, gcrefRegs=000000C0 {esi edi}, byrefRegs=0
        mov      ebx, eax
        ; gcrRegs +[ebx]
                        ;; size=22 bbWeight=0.34 PerfScore 2.55
-G_M39562_IG07:        ; bbWeight=0.34, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
+G_M39562_IG09:        ; bbWeight=0.34, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[eax]
        mov      edi, gword ptr [edi+0x04]
        cmp      ebx, edi
-       je       SHORT G_M39562_IG13
+       je       SHORT G_M39562_IG15
                      ;; size=7 bbWeight=0.34 PerfScore 1.10
-G_M39562_IG08:        ; bbWeight=0.34, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
+G_M39562_IG10:        ; bbWeight=0.34, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
        test     ebx, ebx
-       je       SHORT G_M39562_IG09
+       je       SHORT G_M39562_IG13
        test     edi, edi
-       je       SHORT G_M39562_IG09
-       cmp      dword ptr [ebx], 0xD1FFAB1E
-       jne      G_M39562_IG21
-                       ;; size=20 bbWeight=0.34 PerfScore 2.19
-G_M39562_IG09:        ; bbWeight=0.34, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[ebx edi]
+       je       SHORT G_M39562_IG13
+       mov      eax, ebx
+       ; gcrRegs +[eax]
+       mov      ecx, 0xD1FFAB1E      ; System.RuntimeType
+       cmp      dword ptr [eax], ecx
+       je       SHORT G_M39562_IG12
+                       ;; size=19 bbWeight=0.34 PerfScore 2.36
+G_M39562_IG11:        ; bbWeight=0.08, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[eax]
+       xor      eax, eax
+       ; gcrRegs +[eax]
+                       ;; size=2 bbWeight=0.08 PerfScore 0.02
+G_M39562_IG12:        ; bbWeight=0.34, gcrefRegs=00000089 {eax ebx edi}, byrefRegs=00000000 {}, byref
+       test     eax, eax
+       je       G_M39562_IG23
+                       ;; size=8 bbWeight=0.34 PerfScore 0.42
+G_M39562_IG13:        ; bbWeight=0.34, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[eax ebx edi]
        xor      eax, eax
                        ;; size=2 bbWeight=0.34 PerfScore 0.08
-G_M39562_IG10:        ; bbWeight=0.34, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, epilog, nogc
+G_M39562_IG14:        ; bbWeight=0.34, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, epilog, nogc
        pop      ebx
        pop      esi
        pop      edi
        pop      ebp
        ret      
                        ;; size=5 bbWeight=0.34 PerfScore 1.02
-G_M39562_IG11:        ; bbWeight=0.66, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
-       xor      eax, eax
-                       ;; size=2 bbWeight=0.66 PerfScore 0.17
-G_M39562_IG12:        ; bbWeight=0.66, epilog, nogc, extend
-       pop      ebx
-       pop      esi
-       pop      edi
-       pop      ebp
-       ret      
-                       ;; size=5 bbWeight=0.66 PerfScore 1.98
-G_M39562_IG13:        ; bbWeight=0.00, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M39562_IG15:        ; bbWeight=0.00, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
        mov      eax, 1
-       jmp      SHORT G_M39562_IG10
+       jmp      SHORT G_M39562_IG14
                        ;; size=7 bbWeight=0.00 PerfScore 0.01
-G_M39562_IG14:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M39562_IG16:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, 0xC40
        mov      edx, 0xD1FFAB1E
-       call     CORINFO_HELP_STRCNS
+       call     CORINFO_HELP_NEWARR_1_ALIGN8
        ; gcrRegs +[eax]
        mov      ecx, eax
        ; gcrRegs +[ecx]
@@ -146,7 +161,7 @@ G_M39562_IG14:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; gcrRegs -[eax ecx]
        int3     
                        ;; size=24 bbWeight=0 PerfScore 0.00
-G_M39562_IG15:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
+G_M39562_IG17:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
        ; gcrRegs +[ecx esi edi]
        call     [<unknown method>]
        ; gcrRegs -[ecx] +[eax]
@@ -154,10 +169,10 @@ G_M39562_IG15:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=
        ; gcrRegs +[ecx]
        jmp      G_M39562_IG03
                        ;; size=13 bbWeight=0 PerfScore 0.00
-G_M39562_IG16:        ; bbWeight=0, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
+G_M39562_IG18:        ; bbWeight=0, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[eax ecx]
        mov      ecx, 0xD1FFAB1E      ; System.Reflection.TypeDelegator
-       call     CORINFO_HELP_NEWSFAST
+       call     CORINFO_HELP_NEWFAST_MAYBEFROZEN
        ; gcrRegs +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
@@ -171,23 +186,23 @@ G_M39562_IG16:        ; bbWeight=0, gcrefRegs=000000C0 {esi edi}, byrefRegs=0000
        ; gcrRegs +[ecx]
        jmp      G_M39562_IG03
                        ;; size=29 bbWeight=0 PerfScore 0.00
-G_M39562_IG17:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
+G_M39562_IG19:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
        ; gcrRegs -[ebx]
        xor      ebx, ebx
        jmp      G_M39562_IG04
                        ;; size=7 bbWeight=0 PerfScore 0.00
-G_M39562_IG18:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
+G_M39562_IG20:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
        xor      ebx, ebx
        jmp      G_M39562_IG04
                        ;; size=7 bbWeight=0 PerfScore 0.00
-G_M39562_IG19:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
+G_M39562_IG21:        ; bbWeight=0, gcrefRegs=000000C2 {ecx esi edi}, byrefRegs=00000000 {}, byref
        mov      eax, dword ptr [ecx]
        mov      eax, dword ptr [eax+0x3C]
        call     [eax+0x04]<unknown method>
        ; gcrRegs -[ecx]
        jmp      G_M39562_IG05
                        ;; size=13 bbWeight=0 PerfScore 0.00
-G_M39562_IG20:        ; bbWeight=0, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
+G_M39562_IG22:        ; bbWeight=0, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        ; gcrRegs +[ecx]
        mov      eax, dword ptr [esi]
@@ -196,17 +211,17 @@ G_M39562_IG20:        ; bbWeight=0, gcrefRegs=000000C0 {esi edi}, byrefRegs=0000
        ; gcrRegs -[ecx esi] +[eax]
        mov      ebx, eax
        ; gcrRegs +[ebx]
-       jmp      G_M39562_IG07
+       jmp      G_M39562_IG09
                       ;; size=17 bbWeight=0 PerfScore 0.00
...

benchmarks.run_tiered.windows.x86.checked.mch

-26 (-36.62%) : 7473.dasm - Microsoft.Extensions.DependencyInjection.ServiceDescriptor:SingletonSystem.Canon,System.Canon:Microsoft.Extensions.DependencyInjection.ServiceDescriptor (Tier0) 

@@ -17,39 +17,24 @@ G_M34046_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      dword ptr [ebp-0x04], ecx
        mov      dword ptr [ebp-0x08], ecx
                        ;; size=12 bbWeight=1 PerfScore 3.50
-G_M34046_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x0C], 0
-       je       SHORT G_M34046_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M34046_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x0C]
-       mov      dword ptr [ebp-0x0C], eax
-       jmp      SHORT G_M34046_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M34046_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M34046_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x08]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x0C], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M34046_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        push     dword ptr [ebp-0x0C]
        xor      ecx, ecx
        ; gcrRegs +[ecx]
        xor      edx, edx
        call     [<unknown method>]
        ; gcrRegs -[ecx] +[eax]
-                       ;; size=13 bbWeight=1 PerfScore 4.50
-G_M34046_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=29 bbWeight=1 PerfScore 7.75
+G_M34046_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 71, prolog size 9, PerfScore 23.80, instruction count 25, allocated bytes for code 71 (MethodHash=bcfc7b01) for method Microsoft.Extensions.DependencyInjection.ServiceDescriptor:Singleton[System.__Canon,System.__Canon]():Microsoft.Extensions.DependencyInjection.ServiceDescriptor (Tier0)
+; Total bytes of code 45, prolog size 9, PerfScore 13.00, instruction count 16, allocated bytes for code 45 (MethodHash=bcfc7b01) for method Microsoft.Extensions.DependencyInjection.ServiceDescriptor:Singleton[System.__Canon,System.__Canon]():Microsoft.Extensions.DependencyInjection.ServiceDescriptor (Tier0)
 ; ============================================================

-26 (-34.67%) : 1452.dasm - System.Linq.Enumerable:DistinctSystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -19,26 +19,11 @@ G_M34864_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      gword ptr [ebp-0x08], ecx
        mov      dword ptr [ebp-0x0C], edx
                        ;; size=15 bbWeight=1 PerfScore 4.50
-G_M34864_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x08], 0
-       je       SHORT G_M34864_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M34864_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x0C]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x08]
-       mov      dword ptr [ebp-0x10], eax
-       jmp      SHORT G_M34864_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M34864_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M34864_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x0C]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x10], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M34864_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        push     dword ptr [ebp-0x10]
        mov      ecx, gword ptr [ebp-0x08]
        ; gcrRegs +[ecx]
@@ -46,13 +31,13 @@ G_M34864_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; gcrRegs +[edx]
        call     [<unknown method>]
        ; gcrRegs -[ecx edx] +[eax]
-                       ;; size=14 bbWeight=1 PerfScore 5.25
-G_M34864_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=30 bbWeight=1 PerfScore 8.50
+G_M34864_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 75, prolog size 9, PerfScore 25.55, instruction count 26, allocated bytes for code 75 (MethodHash=c3d577cf) for method System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
+; Total bytes of code 49, prolog size 9, PerfScore 14.75, instruction count 17, allocated bytes for code 49 (MethodHash=c3d577cf) for method System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
 ; ============================================================

-32 (-34.41%) : 15403.dasm - System.Collections.Generic.EnumerableHelpers:GetEmptyEnumeratorSystem.__Canon:System.Collections.Generic.IEnumerator`1System.__Canon 

@@ -7,13 +7,10 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->  esi         single-def
-;  V01 loc0         [V01,T04] (  3,  4   )     int  ->  edi         "spilling helperCall"
+;  V00 TypeCtx      [V00,T00] (  5,  5   )     int  ->  esi         single-def
+;  V01 loc0         [V01,T01] (  2,  4   )     int  ->  edi         "spilling helperCall"
 ;* V02 tmp1         [V02    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V03 tmp2         [V03,T05] (  3,  4   )     int  ->  ebx         "VirtualCall with runtime lookup"
-;  V04 rat0         [V04,T01] (  3,  5.60)     int  ->  edi         "fgMakeTemp is creating a new local variable"
-;  V05 rat1         [V05,T02] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V06 rat2         [V06,T03] (  3,  4.48)     int  ->  ebx         "fgMakeTemp is creating a new local variable"
+;  V03 tmp2         [V03,T02] (  2,  4   )     int  ->  esi         "VirtualCall with runtime lookup"
 ;
 ; Lcl frame size = 4
 
@@ -22,66 +19,38 @@ G_M57211_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      ebp, esp
        push     edi
        push     esi
-       push     ebx
        push     eax
-       mov      dword ptr [ebp-0x10], ecx
+       mov      dword ptr [ebp-0x0C], ecx
        mov      esi, ecx
-                        ;; size=12 bbWeight=1 PerfScore 6.50
-G_M57211_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       mov      edi, dword ptr [ecx+0x08]
-       test     edi, edi
-       je       SHORT G_M57211_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M57211_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M57211_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M57211_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+                       ;; size=11 bbWeight=1 PerfScore 5.50
+G_M57211_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      edi, eax
-                        ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M57211_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M57211_IG08
-                       ;; size=9 bbWeight=1 PerfScore 6.00
-G_M57211_IG06:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ebx, dword ptr [ecx+0x0C]
-       test     ebx, ebx
-       je       SHORT G_M57211_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M57211_IG07:        ; bbWeight=0.64, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M57211_IG09
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M57211_IG08:        ; bbWeight=0.36, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      ebx, eax
-                       ;; size=14 bbWeight=0.36 PerfScore 0.63
-G_M57211_IG09:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+       call     CORINFO_HELP_MEMCPY
+       mov      esi, eax
        mov      ecx, edi
        call     [System.Array:Empty[System.__Canon]():System.__Canon[]]
        ; gcrRegs +[eax]
        mov      ecx, eax
        ; gcrRegs +[ecx]
-       mov      eax, ebx
+       mov      eax, esi
        ; gcrRegs -[eax]
        nop      
        call     [eax]
        ; gcrRegs -[ecx] +[eax]
-                       ;; size=17 bbWeight=1 PerfScore 7.00
-G_M57211_IG10:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=45 bbWeight=1 PerfScore 10.50
+G_M57211_IG03:        ; bbWeight=1, epilog, nogc, extend
        pop      ecx
-       pop      ebx
        pop      esi
        pop      edi
        pop      ebp
        ret      
-                     ;; size=6 bbWeight=1 PerfScore 3.50
+                       ;; size=5 bbWeight=1 PerfScore 3.00
 
-; Total bytes of code 93, prolog size 10, PerfScore 34.71, instruction count 40, allocated bytes for code 93 (MethodHash=f41c2084) for method System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (Tier1)
+; Total bytes of code 61, prolog size 9, PerfScore 19.00, instruction count 26, allocated bytes for code 61 (MethodHash=f41c2084) for method System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (Tier1)
 ; ============================================================

-10 (-3.19%) : 1405.dasm - System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.Canon]:GetListByName(uint,int,uint,int,int,int):System.Canon[]:this (Tier1) 

@@ -9,22 +9,22 @@
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] ( 10,  6.50)     ref  ->  esi         this class-hnd single-def <System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]>
-;  V01 arg1         [V01,T05] (  3,  2.50)     int  ->  edx         single-def
+;  V01 arg1         [V01,T04] (  3,  2.50)     int  ->  edx         single-def
 ;  V02 arg2         [V02,T11] (  2,  1.50)     int  ->  ecx         single-def
 ;  V03 arg3         [V03,T12] (  2,  1.50)     int  ->  ebx         single-def
 ;  V04 arg4         [V04,T13] (  2,  1.50)     int  ->  [ebp+0x10]  single-def
 ;  V05 arg5         [V05,T14] (  1,  1   )     int  ->  [ebp+0x0C]  single-def
 ;  V06 arg6         [V06,T08] (  2,  2   )     int  ->  edi         single-def
-;  V07 loc0         [V07,T02] ( 10,  6.50)  struct (12) [ebp-0x18]  do-not-enreg[SF] ld-addr-op <System.RuntimeType+RuntimeTypeCache+Filter>
-;  V08 loc1         [V08,T03] ( 10,  5.62)     ref  ->  ebx         class-hnd <<unknown class>>
-;  V09 tmp0         [V09,T07] (  4,  2.75)     int  ->  edx         "spilling helperCall"
-;* V10 tmp1         [V10    ] (  0,  0   )     int  ->  zero-ref    "fgMakeTemp is creating a new local variable"
-;  V11 tmp2         [V11,T01] (  5,  6.75)     ref  ->  eax         class-hnd "spilling QMark2" <System.__Canon[]>
-;* V12 tmp3         [V12    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.MdUtf8String>
-;  V13 tmp4         [V13,T09] (  2,  2   )     int  ->  ebx         "field V12.m_pStringHeap (fldOffset=0x0)" P-INDEP
-;  V14 tmp5         [V14,T10] (  2,  2   )     int  ->  eax         "field V12.m_StringHeapByteLength (fldOffset=0x4)" P-INDEP
-;  V15 rat0         [V15,T06] (  3,  4.40)     int  ->  ecx         "Spilling to split statement for tree"
-;  V16 rat1         [V16,T04] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V07 loc0         [V07,T01] ( 10,  6.50)  struct (12) [ebp-0x18]  do-not-enreg[SF] ld-addr-op <System.RuntimeType+RuntimeTypeCache+Filter>
+;  V08 loc1         [V08,T03] (  9,  5.50)     ref  ->  ebx         class-hnd <<unknown class>>
+;* V09 tmp0         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;* V10 tmp1         [V10    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.MdUtf8String>
+;  V11 tmp2         [V11,T09] (  2,  2   )     int  ->  ebx         "field V10.m_pStringHeap (fldOffset=0x0)" P-INDEP
+;  V12 tmp3         [V12,T10] (  2,  2   )     int  ->  eax         "field V10.m_StringHeapByteLength (fldOffset=0x4)" P-INDEP
+;  V13 tmp4         [V13,T07] (  2,  4   )     int  ->  ecx         "argument with side effect"
+;  V14 rat0         [V14,T05] (  3,  4.40)     int  ->  ecx         "Spilling to split statement for tree"
+;  V15 rat1         [V15,T06] (  3,  4   )     int  ->  ecx         "runtime lookup"
+;  V16 rat2         [V16,T02] (  3,  5.60)     int  ->  eax         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 12
 
@@ -176,37 +176,26 @@ G_M33863_IG13:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=0000
        mov      ecx, dword ptr [esi]
        mov      edx, dword ptr [ecx+0x24]
        mov      edx, dword ptr [edx]
-       mov      edx, dword ptr [edx+0x0C]
-       test     edx, edx
+       mov      eax, dword ptr [edx+0x0C]
+       test     eax, eax
        je       SHORT G_M33863_IG15
                        ;; size=14 bbWeight=1 PerfScore 9.25
 G_M33863_IG14:        ; bbWeight=0.80, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       mov      ecx, eax
        jmp      SHORT G_M33863_IG16
-                      ;; size=2 bbWeight=0.80 PerfScore 1.60
+                        ;; size=4 bbWeight=0.80 PerfScore 1.80
 G_M33863_IG15:        ; bbWeight=0.20, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_CLASS
-       mov      edx, eax
+       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD_LOG
+       mov      ecx, eax
                        ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M33863_IG16:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, ebx
-       ; gcrRegs +[eax]
-       test     eax, eax
-       je       SHORT G_M33863_IG19
-                       ;; size=6 bbWeight=1 PerfScore 1.50
-G_M33863_IG17:        ; bbWeight=0.25, gcrefRegs=00000049 {eax ebx esi}, byrefRegs=00000000 {}, byref, isz
-       cmp      dword ptr [eax], edx
-       je       SHORT G_M33863_IG19
-                       ;; size=4 bbWeight=0.25 PerfScore 1.00
-G_M33863_IG18:        ; bbWeight=0.12, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[eax]
-       mov      ecx, edx
+G_M33863_IG16:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      edx, ebx
        ; gcrRegs +[edx]
-       call     CORINFO_HELP_CHKCASTARRAY
+       call     CORINFO_HELP_CHKCASTINTERFACE
        ; gcrRegs -[edx ebx] +[eax]
-                      ;; size=9 bbWeight=0.12 PerfScore 0.19
-G_M33863_IG19:        ; bbWeight=1, gcrefRegs=00000041 {eax esi}, byrefRegs=00000000 {}, byref, epilog, nogc
+                     ;; size=7 bbWeight=1 PerfScore 1.25
+G_M33863_IG17:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -223,6 +212,6 @@ RWD00   dd  G_M33863_IG05 - G_M33863_IG02
            dd  G_M33863_IG10 - G_M33863_IG02
 
 
-; Total bytes of code 313, prolog size 9, PerfScore 76.09, instruction count 108, allocated bytes for code 313 (MethodHash=14bb7bb8) for method System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:GetListByName(uint,int,uint,int,int,int):System.__Canon[]:this (Tier1)
+; Total bytes of code 303, prolog size 9, PerfScore 74.85, instruction count 103, allocated bytes for code 303 (MethodHash=14bb7bb8) for method System.RuntimeType+RuntimeTypeCache+MemberInfoCache`1[System.__Canon]:GetListByName(uint,int,uint,int,int,int):System.__Canon[]:this (Tier1)
 ; ============================================================

-12 (-2.86%) : 1074.dasm - System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendFormattedSystem.__Canon:this (Tier0-FullOpts) 

@@ -10,17 +10,17 @@
 ;
 ;  V00 this         [V00,T03] ( 16, 21.50)   byref  ->  esi         this single-def
 ;  V01 arg1         [V01    ] (  8,  8.50)     ref  ->  [ebp-0x14]  do-not-enreg[X] addr-exposed ld-addr-op class-hnd single-def <System.__Canon>
-;  V02 TypeCtx      [V02,T23] (  3,  1.60)     int  ->  ecx         single-def
+;  V02 TypeCtx      [V02,T24] (  2,  1.50)     int  ->  ecx         single-def
 ;  V03 loc0         [V03,T10] (  8,  4   )     ref  ->  edi         class-hnd <System.String>
 ;* V04 loc1         [V04    ] (  0,  0   )     int  ->  zero-ref    ld-addr-op
 ;* V05 loc2         [V05    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.ReadOnlySpan`1[ushort]>
 ;  V06 loc3         [V06    ] (  2,  4.50)     int  ->  [ebp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
 ;  V07 loc4         [V07    ] (  5,  2.50)     ref  ->  [ebp-0x1C]  do-not-enreg[X] must-init addr-exposed ld-addr-op class-hnd <System.__Canon>
-;  V08 loc5         [V08,T17] (  4,  2   )   byref  ->  ecx        
-;  V09 tmp1         [V09,T24] (  3,  1.50)     ref  ->  edi        
+;  V08 loc5         [V08,T16] (  4,  2   )   byref  ->  ecx        
+;  V09 tmp1         [V09,T22] (  3,  1.50)     ref  ->  edi        
 ;  V10 tmp2         [V10,T04] (  2, 16   )     ref  ->  edi         class-hnd "impAppendStmt" <System.__Canon>
 ;* V11 tmp3         [V11    ] (  0,  0   )  struct ( 8) zero-ref    "impAppendStmt" <System.Span`1[ushort]>
-;  V12 tmp4         [V12,T18] (  3,  2   )     int  ->  eax         "spilling helperCall"
+;  V12 tmp4         [V12,T20] (  2,  2   )     int  ->  eax         "spilling helperCall"
 ;  V13 tmp5         [V13,T00] (  4, 32   )     int  ->  edx         "Inlining Arg"
 ;  V14 tmp6         [V14,T01] (  3, 24   )   byref  ->  ecx         "Inlining Arg"
 ;* V15 tmp7         [V15    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
@@ -33,14 +33,14 @@
 ;  V22 tmp14        [V22,T13] (  3,  3   )   byref  ->  ecx         single-def "Inlining Arg"
 ;* V23 tmp15        [V23    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
 ;  V24 tmp16        [V24,T15] (  3,  3   )     int  ->  ebx         "Inlining Arg"
-;  V25 tmp17        [V25,T19] (  2,  2   )   byref  ->  [ebp-0x24]  spill-single-def "Inlining Arg"
+;  V25 tmp17        [V25,T17] (  2,  2   )   byref  ->  [ebp-0x24]  spill-single-def "Inlining Arg"
 ;* V26 tmp18        [V26    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V27 tmp19        [V27    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;* V28 tmp20        [V28,T26] (  0,  0   )   ubyte  ->  zero-ref    "Inline stloc first use temp"
+;* V28 tmp20        [V28,T25] (  0,  0   )   ubyte  ->  zero-ref    "Inline stloc first use temp"
 ;* V29 tmp21        [V29    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V30 tmp22        [V30    ] (  0,  0   )   byref  ->  zero-ref    single-def "Inlining Arg"
-;  V31 tmp23        [V31,T20] (  2,  2   )   byref  ->  edx         single-def "Inlining Arg"
-;  V32 tmp24        [V32,T22] (  2,  2   )     int  ->  ecx         "Inlining Arg"
+;  V31 tmp23        [V31,T18] (  2,  2   )   byref  ->  edx         single-def "Inlining Arg"
+;  V32 tmp24        [V32,T21] (  2,  2   )     int  ->  ecx         "Inlining Arg"
 ;* V33 tmp25        [V33    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;  V34 tmp26        [V34,T07] (  2,  8   )   byref  ->  edx         "field V05._reference (fldOffset=0x0)" P-INDEP
 ;* V35 tmp27        [V35,T12] (  0,  0   )     int  ->  zero-ref    "field V05._length (fldOffset=0x4)" P-INDEP
@@ -55,10 +55,9 @@
 ;* V44 tmp36        [V44    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V29._reference (fldOffset=0x0)" P-INDEP
 ;* V45 tmp37        [V45    ] (  0,  0   )     int  ->  zero-ref    "field V29._length (fldOffset=0x4)" P-INDEP
 ;  V46 tmp38        [V46,T14] (  3,  3   )     ref  ->  ecx         single-def "argument with side effect"
-;  V47 tmp39        [V47,T21] (  2,  2   )     ref  ->  ecx         single-def "argument with side effect"
+;  V47 tmp39        [V47,T19] (  2,  2   )     ref  ->  ecx         single-def "argument with side effect"
 ;  V48 cse0         [V48,T06] (  3, 12   )     int  ->  ebx         "CSE - moderate"
-;  V49 cse1         [V49,T25] (  3,  1.50)     int  ->  ebx         "CSE - conservative"
-;  V50 rat0         [V50,T16] (  3,  2.80)     int  ->  eax         "fgMakeTemp is creating a new local variable"
+;  V49 cse1         [V49,T23] (  3,  1.50)     int  ->  ebx         "CSE - conservative"
 ;
 ; Lcl frame size = 24
 
@@ -80,22 +79,11 @@ G_M12060_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
                        ;; size=28 bbWeight=1 PerfScore 11.00
 G_M12060_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
        cmp      byte  ptr [esi+0x0C], 0
-       je       SHORT G_M12060_IG08
-                       ;; size=6 bbWeight=1 PerfScore 4.00
-G_M12060_IG03:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
-       mov      edx, dword ptr [ecx+0x20]
-       mov      eax, dword ptr [edx+0x08]
-       test     eax, eax
        je       SHORT G_M12060_IG05
-                      ;; size=10 bbWeight=0.50 PerfScore 2.62
-G_M12060_IG04:        ; bbWeight=0.40, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
-       jmp      SHORT G_M12060_IG06
-                       ;; size=2 bbWeight=0.40 PerfScore 0.80
-G_M12060_IG05:        ; bbWeight=0.10, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
+                        ;; size=6 bbWeight=1 PerfScore 4.00
+G_M12060_IG03:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=10 bbWeight=0.10 PerfScore 0.12
-G_M12060_IG06:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
+       call     CORINFO_HELP_MEMCPY
        push     0
        push     eax
        mov      ecx, esi
@@ -105,8 +93,8 @@ G_M12060_IG06:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000040
        call     [<unknown method>]
        ; gcrRegs -[edx]
        ; byrRegs -[ecx esi]
-                      ;; size=14 bbWeight=0.50 PerfScore 3.12
-G_M12060_IG07:        ; bbWeight=0.50, epilog, nogc, extend
+                      ;; size=24 bbWeight=0.50 PerfScore 3.75
+G_M12060_IG04:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -114,26 +102,26 @@ G_M12060_IG07:        ; bbWeight=0.50, epilog, nogc, extend
        pop      ebp
        ret      4
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
-G_M12060_IG08:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, gcvars, byref, isz
+G_M12060_IG05:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, gcvars, byref, isz
        ; byrRegs +[esi]
        mov      edx, gword ptr [ebp-0x14]
        ; gcrRegs +[edx]
        mov      ecx, 0xD1FFAB1E      ; <unknown class>
-       call     [CORINFO_HELP_ISINSTANCEOFINTERFACE]
+       call     [CORINFO_HELP_INITINSTCLASS]
        ; gcrRegs -[edx] +[eax]
        test     eax, eax
-       je       G_M12060_IG15
+       je       G_M12060_IG12
        mov      edx, gword ptr [ebp-0x14]
        ; gcrRegs +[edx]
        mov      ecx, 0xD1FFAB1E      ; <unknown class>
-       call     [CORINFO_HELP_ISINSTANCEOFINTERFACE]
+       call     [CORINFO_HELP_INITINSTCLASS]
        ; gcrRegs -[edx]
        test     eax, eax
-       jne      SHORT G_M12060_IG10
+       jne      SHORT G_M12060_IG07
        mov      edx, gword ptr [ebp-0x14]
        ; gcrRegs +[edx]
        mov      ecx, 0xD1FFAB1E      ; <unknown class>
-       call     [CORINFO_HELP_CHKCASTINTERFACE]
+       call     [CORINFO_HELP_ISINSTANCEOFANY]
        ; gcrRegs -[edx]
        mov      ecx, eax
        ; gcrRegs +[ecx]
@@ -144,20 +132,20 @@ G_M12060_IG08:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}
        ; gcrRegs -[ecx edx]
        mov      edi, eax
        ; gcrRegs +[edi]
-       jmp      G_M12060_IG17
+       jmp      G_M12060_IG14
                       ;; size=73 bbWeight=0.50 PerfScore 11.50
-G_M12060_IG09:        ; bbWeight=2, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
+G_M12060_IG06:        ; bbWeight=2, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
        ; gcrRegs -[eax edi]
        mov      ecx, esi
        ; byrRegs +[ecx]
        call     [<unknown method>]
        ; byrRegs -[ecx]
                        ;; size=8 bbWeight=2 PerfScore 6.50
-G_M12060_IG10:        ; bbWeight=4, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
+G_M12060_IG07:        ; bbWeight=4, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
        mov      edx, gword ptr [ebp-0x14]
        ; gcrRegs +[edx]
        mov      ecx, 0xD1FFAB1E      ; <unknown class>
-       call     [CORINFO_HELP_CHKCASTINTERFACE]
+       call     [CORINFO_HELP_ISINSTANCEOFANY]
        ; gcrRegs -[edx] +[eax]
        mov      edi, eax
        ; gcrRegs +[edi]
@@ -166,7 +154,7 @@ G_M12060_IG10:        ; bbWeight=4, gcrefRegs=00000000 {}, byrefRegs=00000040 {e
        mov      edx, dword ptr [esi+0x08]
        mov      ebx, dword ptr [ecx+0x04]
        cmp      edx, ebx
-       ja       G_M12060_IG22
+       ja       G_M12060_IG19
        mov      ecx, bword ptr [ecx]
        lea      eax, bword ptr [ecx+2*edx]
        ; gcrRegs -[eax]
@@ -174,9 +162,9 @@ G_M12060_IG10:        ; bbWeight=4, gcrefRegs=00000000 {}, byrefRegs=00000040 {e
        mov      bword ptr [ebp-0x20], eax
        ; GC ptr vars +{V17}
        sub      ebx, edx
-       jns      SHORT G_M12060_IG12
+       jns      SHORT G_M12060_IG09
                      ;; size=45 bbWeight=4 PerfScore 60.00
-G_M12060_IG11:        ; bbWeight=2, gcVars=00000020 {V17}, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, gcvars, byref
+G_M12060_IG08:        ; bbWeight=2, gcVars=00000020 {V17}, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, gcvars, byref
        ; byrRegs -[eax ecx]
        mov      ecx, 0xD1FFAB1E
        ; gcrRegs +[ecx]
@@ -185,7 +173,7 @@ G_M12060_IG11:        ; bbWeight=2, gcVars=00000020 {V17}, gcrefRegs=00000080 {e
        call     [<unknown method>]
        ; gcrRegs -[ecx edx]
                        ;; size=16 bbWeight=2 PerfScore 7.00
-G_M12060_IG12:        ; bbWeight=4, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
+G_M12060_IG09:        ; bbWeight=4, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
        mov      eax, bword ptr [ebp-0x20]
        ; byrRegs +[eax]
        xor      edx, edx
@@ -204,13 +192,13 @@ G_M12060_IG12:        ; bbWeight=4, gcrefRegs=00000080 {edi}, byrefRegs=00000040
        ; gcrRegs -[ecx edi]
        ; byrRegs -[eax]
        test     eax, eax
-       je       SHORT G_M12060_IG09
+       je       SHORT G_M12060_IG06
                      ;; size=27 bbWeight=4 PerfScore 49.00
-G_M12060_IG13:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
+G_M12060_IG10:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
        mov      ecx, dword ptr [ebp-0x18]
        add      dword ptr [esi+0x08], ecx
                        ;; size=6 bbWeight=0.50 PerfScore 2.00
-G_M12060_IG14:        ; bbWeight=0.50, epilog, nogc, extend
+G_M12060_IG11:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -218,7 +206,7 @@ G_M12060_IG14:        ; bbWeight=0.50, epilog, nogc, extend
        pop      ebp
        ret      4
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
-G_M12060_IG15:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, gcvars, byref, isz
+G_M12060_IG12:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, gcvars, byref, isz
        xor      ecx, ecx
        ; gcrRegs +[ecx]
        mov      gword ptr [ebp-0x1C], ecx
@@ -226,7 +214,7 @@ G_M12060_IG15:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}
        ; gcrRegs -[ecx]
        ; byrRegs +[ecx]
        cmp      gword ptr [ebp-0x1C], 0
-       jne      SHORT G_M12060_IG16
+       jne      SHORT G_M12060_IG13
        mov      ecx, gword ptr [ecx]
        ; gcrRegs +[ecx]
        ; byrRegs -[ecx]
@@ -235,12 +223,12 @@ G_M12060_IG15:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}
        ; gcrRegs -[ecx]
        ; byrRegs +[ecx]
        cmp      gword ptr [ebp-0x1C], 0
-       jne      SHORT G_M12060_IG16
+       jne      SHORT G_M12060_IG13
        xor      edi, edi
        ; gcrRegs +[edi]
-       jmp      SHORT G_M12060_IG17
+       jmp      SHORT G_M12060_IG14
                       ;; size=32 bbWeight=0.50 PerfScore 6.75
-G_M12060_IG16:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000042 {ecx esi}, byref
+G_M12060_IG13:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000042 {ecx esi}, byref
        ; gcrRegs -[edi]
        mov      ecx, gword ptr [ecx]
        ; gcrRegs +[ecx]
@@ -252,23 +240,23 @@ G_M12060_IG16:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000042
        mov      edi, eax
        ; gcrRegs +[edi]
                        ;; size=12 bbWeight=0.50 PerfScore 4.62
-G_M12060_IG17:        ; bbWeight=0.50, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
+G_M12060_IG14:        ; bbWeight=0.50, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
        ; gcrRegs -[eax]
        test     edi, edi
-       je       SHORT G_M12060_IG21
+       je       SHORT G_M12060_IG18
        lea      ecx, bword ptr [esi+0x10]
        ; byrRegs +[ecx]
        mov      edx, dword ptr [esi+0x08]
        mov      ebx, dword ptr [ecx+0x04]
        cmp      edx, ebx
-       ja       SHORT G_M12060_IG22
+       ja       SHORT G_M12060_IG19
        mov      ecx, bword ptr [ecx]
        lea      eax, bword ptr [ecx+2*edx]
        ; byrRegs +[eax]
...

-2 (-1.49%) : 3344.dasm - System.Array:IndexOfSystem.__Canon:int (Tier1) 

@@ -9,10 +9,10 @@
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T00] (  5,  5   )     ref  ->  esi         class-hnd single-def <System.__Canon[]>
-;  V01 arg1         [V01,T03] (  3,  3   )     ref  ->  edi         ld-addr-op class-hnd single-def <System.__Canon>
-;  V02 arg2         [V02,T06] (  3,  3   )     int  ->  ebx         single-def
-;  V03 arg3         [V03,T09] (  2,  2   )     int  ->  [ebp+0x0C]  single-def
-;  V04 TypeCtx      [V04,T08] (  3,  2.36)     int  ->  ecx         single-def
+;  V01 arg1         [V01,T02] (  3,  3   )     ref  ->  edi         ld-addr-op class-hnd single-def <System.__Canon>
+;  V02 arg2         [V02,T03] (  3,  3   )     int  ->  ebx         single-def
+;  V03 arg3         [V03,T06] (  2,  2   )     int  ->  [ebp+0x0C]  single-def
+;  V04 TypeCtx      [V04,T04] (  3,  3   )     int  ->  [ebp+0x08]  single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -25,10 +25,7 @@
 ;* V14 tmp5         [V14    ] (  0,  0   )     int  ->  zero-ref    "Inline return value spill temp"
 ;* V15 tmp6         [V15    ] (  0,  0   )     int  ->  zero-ref    ld-addr-op "Inlining Arg"
 ;  V16 tmp7         [V16,T01] (  3,  6   )     ref  ->  eax         single-def "argument with side effect"
-;  V17 cse0         [V17,T07] (  3,  3   )     int  ->  edx         "CSE - aggressive"
-;  V18 rat0         [V18,T05] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V19 rat1         [V19,T02] (  3,  5.60)     int  ->  edx         "spilling expr"
-;  V20 rat2         [V20,T04] (  3,  4.48)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V17 cse0         [V17,T05] (  3,  3   )     int  ->  ecx         "CSE - aggressive"
 ;
 ; Lcl frame size = 4
 
@@ -46,38 +43,27 @@ G_M13831_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      edi, edx
        ; gcrRegs +[edi]
        mov      ebx, dword ptr [ebp+0x10]
-       mov      eax, dword ptr [ebp+0x0C]
-       mov      ecx, dword ptr [ebp+0x08]
+       mov      edx, dword ptr [ebp+0x0C]
+       mov      eax, dword ptr [ebp+0x08]
                       ;; size=26 bbWeight=1 PerfScore 11.75
 G_M13831_IG02:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
        test     esi, esi
-       je       SHORT G_M13831_IG08
-       mov      edx, dword ptr [esi+0x04]
-       cmp      edx, ebx
-       jb       SHORT G_M13831_IG09
-       sub      edx, ebx
-       mov      dword ptr [ebp+0x0C], eax
-       cmp      edx, eax
-       jb       SHORT G_M13831_IG10
-       mov      edx, dword ptr [ecx+0x20]
-       cmp      dword ptr [edx+0x04], 12
-       jle      SHORT G_M13831_IG05
-                       ;; size=29 bbWeight=1 PerfScore 13.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, dword ptr [edx+0x0C]
-       test     edx, edx
-       je       SHORT G_M13831_IG05
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
+       je       SHORT G_M13831_IG04
+       mov      ecx, dword ptr [esi+0x04]
+       cmp      ecx, ebx
+       jb       SHORT G_M13831_IG05
+       sub      ecx, ebx
+       mov      dword ptr [ebp+0x0C], edx
+       cmp      ecx, edx
+       jb       SHORT G_M13831_IG06
+       mov      dword ptr [ebp+0x08], eax
+       mov      ecx, eax
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edx, eax
-                       ;; size=12 bbWeight=0.36 PerfScore 0.54
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       mov      ecx, edx
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, dword ptr [ebp+0x08]
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, eax
        call     [System.Collections.Generic.EqualityComparer`1[System.__Canon]:get_Default():System.Collections.Generic.EqualityComparer`1[System.__Canon]]
        ; gcrRegs +[eax]
        push     edi
@@ -92,8 +78,8 @@ G_M13831_IG06:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=0000
        mov      eax, dword ptr [eax+0x30]
        call     [eax]<unknown method>
        ; gcrRegs -[ecx edx esi edi]
-                      ;; size=24 bbWeight=1 PerfScore 13.75
-G_M13831_IG07:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=72 bbWeight=1 PerfScore 25.50
+G_M13831_IG03:        ; bbWeight=1, epilog, nogc, extend
        pop      ecx
        pop      ebx
        pop      esi
@@ -101,20 +87,20 @@ G_M13831_IG07:        ; bbWeight=1, epilog, nogc, extend
        pop      ebp
        ret      12
                        ;; size=8 bbWeight=1 PerfScore 4.50
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        mov      ecx, 2
        call     [System.ThrowHelper:ThrowArgumentNullException(int)]
        int3     
                        ;; size=12 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        call     [System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()]
        int3     
                        ;; size=7 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        call     [System.ThrowHelper:ThrowCountArgumentOutOfRange_ArgumentOutOfRange_Count()]
        int3     
                        ;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 134, prolog size 13, PerfScore 47.42, instruction count 55, allocated bytes for code 134 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
+; Total bytes of code 132, prolog size 13, PerfScore 41.75, instruction count 52, allocated bytes for code 132 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier1)
 ; ============================================================

coreclr_tests.run.windows.x86.checked.mch

-42 (-14.14%) : 480.dasm - System.Linq.Enumerable:TryGetFirstSystem.__Canon:System.__Canon (FullOpts) 

@@ -7,24 +7,19 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 arg0         [V00,T05] (  4,  4   )     ref  ->  edi         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V00 arg0         [V00,T05] (  4,  4   )     ref  ->  ebx         class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
 ;  V01 arg1         [V01,T01] (  5, 19   )     ref  ->  esi         class-hnd single-def <System.Func`2[System.__Canon,ubyte]>
-;  V02 arg2         [V02,T12] (  2,  2   )   byref  ->  [ebp+0x0C]  single-def
-;  V03 TypeCtx      [V03,T08] (  5,  2.88)     int  ->  ebx         single-def
+;  V02 arg2         [V02,T07] (  2,  2   )   byref  ->  [ebp+0x0C]  single-def
+;  V03 TypeCtx      [V03,T04] (  3, 10   )     int  ->  edi         single-def
 ;  V04 loc0         [V04,T02] (  7, 20   )     ref  ->  [ebp-0x24]  class-hnd EH-live single-def <<unknown class>>
 ;  V05 loc1         [V05,T03] (  3, 17   )     ref  ->  [ebp-0x28]  class-hnd spill-single-def <System.__Canon>
-;  V06 loc2         [V06,T13] (  2,  2   )     ref  ->  [ebp-0x2C]  do-not-enreg[Z] must-init class-hnd EH-live <System.__Canon>
+;  V06 loc2         [V06,T08] (  2,  2   )     ref  ->  [ebp-0x2C]  do-not-enreg[Z] must-init class-hnd EH-live <System.__Canon>
 ;* V07 loc3         [V07    ] (  0,  0   )     ref  ->  zero-ref    ld-addr-op class-hnd <System.__Canon>
 ;* V08 loc4         [V08    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V09 tmp1         [V09,T07] (  3,  4   )     int  ->  registers   "VirtualCall with runtime lookup"
+;  V09 tmp1         [V09,T06] (  2,  4   )     int  ->  eax         "VirtualCall with runtime lookup"
 ;* V10 tmp2         [V10    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V11 tmp3         [V11,T00] (  2, 32   )     int  ->  eax         "VirtualCall with runtime lookup"
 ;  V12 EHSlots      [V12    ] (  1,  1   )  struct (16) [ebp-0x20]  do-not-enreg[XS] addr-exposed "lvaShadowSPslotsVar"
-;  V13 cse0         [V13,T04] (  2,  8.50)     int  ->  ebx         hoist "CSE - moderate"
-;  V14 rat0         [V14,T06] (  3,  5.60)     int  ->  ecx         "fgMakeTemp is creating a new local variable"
-;  V15 rat1         [V15,T11] (  3,  2   )     int  ->  ebx         "runtime lookup"
-;  V16 rat2         [V16,T09] (  3,  2.80)     int  ->  ecx         "spilling expr"
-;  V17 rat3         [V17,T10] (  3,  2.24)     int  ->  eax         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 32
 
@@ -40,78 +35,45 @@ G_M62024_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      dword ptr [ebp-0x18], eax
        mov      eax, dword ptr [ebp+0x08]
        mov      dword ptr [ebp-0x10], eax
-       mov      edi, ecx
-       ; gcrRegs +[edi]
+       mov      ebx, ecx
+       ; gcrRegs +[ebx]
        mov      esi, edx
        ; gcrRegs +[esi]
-       mov      ebx, dword ptr [ebp+0x08]
+       mov      edi, dword ptr [ebp+0x08]
                       ;; size=30 bbWeight=1 PerfScore 11.25
-G_M62024_IG02:        ; bbWeight=1, gcVars=00002000 {V06}, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
-       ; GC ptr vars +{V06 V13}
-       test     edi, edi
-       je       G_M62024_IG22
+G_M62024_IG02:        ; bbWeight=1, gcVars=00000100 {V06}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref
+       ; GC ptr vars +{V06}
+       test     ebx, ebx
+       je       G_M62024_IG15
        test     esi, esi
-       je       G_M62024_IG23
-       mov      ecx, dword ptr [ebx+0x20]
-       mov      ecx, dword ptr [ecx+0x08]
-       test     ecx, ecx
-       je       SHORT G_M62024_IG04
-                       ;; size=26 bbWeight=1 PerfScore 7.75
-G_M62024_IG03:        ; bbWeight=0.80, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, ecx
-       jmp      SHORT G_M62024_IG05
-                       ;; size=4 bbWeight=0.80 PerfScore 1.80
-G_M62024_IG04:        ; bbWeight=0.20, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       mov      ecx, ebx
-       mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edx, eax
-                       ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M62024_IG05:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
+       je       G_M62024_IG16
        mov      ecx, edi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, ebx
        ; gcrRegs +[ecx]
-       mov      eax, edx
        nop      
        call     [eax]
-       ; gcrRegs -[ecx edi] +[eax]
-       mov      edi, eax
-       ; gcrRegs +[edi]
-       mov      gword ptr [ebp-0x24], edi
+       ; gcrRegs -[ecx ebx] +[eax]
+       mov      ebx, eax
+       ; gcrRegs +[ebx]
+       mov      gword ptr [ebp-0x24], ebx
        ; GC ptr vars +{V04}
-                     ;; size=14 bbWeight=1 PerfScore 5.00
-G_M62024_IG06:        ; bbWeight=1, gcVars=00002004 {V04 V06}, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
+                       ;; size=40 bbWeight=1 PerfScore 8.75
+G_M62024_IG03:        ; bbWeight=1, gcVars=00000104 {V04 V06}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs -[eax]
-       ; GC ptr vars -{V13}
-       mov      ecx, edi
+       mov      ecx, ebx
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        test     eax, eax
-       je       SHORT G_M62024_IG14
+       je       SHORT G_M62024_IG07
                      ;; size=12 bbWeight=1 PerfScore 4.50
-G_M62024_IG07:        ; bbWeight=0.50, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [ebx+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M62024_IG10
-                       ;; size=9 bbWeight=0.50 PerfScore 3.00
-G_M62024_IG08:        ; bbWeight=0.40, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ecx+0x0C]
-       test     eax, eax
-       je       SHORT G_M62024_IG10
-                       ;; size=7 bbWeight=0.40 PerfScore 1.30
-G_M62024_IG09:        ; bbWeight=0.32, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      ebx, eax
-       jmp      SHORT G_M62024_IG11
-                       ;; size=4 bbWeight=0.32 PerfScore 0.72
-G_M62024_IG10:        ; bbWeight=0.18, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       mov      ecx, ebx
-       mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      ebx, eax
-                       ;; size=14 bbWeight=0.18 PerfScore 0.32
-G_M62024_IG11:        ; bbWeight=8, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, ebx
+G_M62024_IG04:        ; bbWeight=8, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
        mov      ecx, edi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, ebx
        ; gcrRegs +[ecx]
        nop      
        call     [eax]
@@ -125,20 +87,20 @@ G_M62024_IG11:        ; bbWeight=8, gcrefRegs=000000C0 {esi edi}, byrefRegs=0000
        call     [esi+0x0C]<unknown method>
        ; gcrRegs -[eax ecx edx]
        test     eax, eax
-       jne      SHORT G_M62024_IG13
-       mov      ecx, edi
+       jne      SHORT G_M62024_IG06
+       mov      ecx, ebx
        ; gcrRegs +[ecx]
        ; GC ptr vars -{V05}
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        test     eax, eax
-       jne      SHORT G_M62024_IG11
-                       ;; size=36 bbWeight=8 PerfScore 126.00
-G_M62024_IG12:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, byref, isz
+       jne      SHORT G_M62024_IG04
+                       ;; size=46 bbWeight=8 PerfScore 136.00
+G_M62024_IG05:        ; bbWeight=1, gcrefRegs=00000008 {ebx}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[esi]
-       jmp      SHORT G_M62024_IG14
+       jmp      SHORT G_M62024_IG07
                        ;; size=2 bbWeight=1 PerfScore 2.00
-G_M62024_IG13:        ; bbWeight=1, gcVars=0000200C {V04 V05 V06}, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M62024_IG06:        ; bbWeight=1, gcVars=0000010C {V04 V05 V06}, gcrefRegs=00000008 {ebx}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; GC ptr vars +{V03 V05}
        mov      esi, bword ptr [ebp+0x0C]
        ; byrRegs +[esi]
@@ -149,41 +111,41 @@ G_M62024_IG13:        ; bbWeight=1, gcVars=0000200C {V04 V05 V06}, gcrefRegs=000
        mov      gword ptr [ebp-0x2C], esi
        mov      dword ptr [ebp-0x1C], 0
        mov      dword ptr [ebp-0x18], 252
-       push     G_M62024_IG15
-       jmp      SHORT G_M62024_IG16
+       push     G_M62024_IG08
+       jmp      SHORT G_M62024_IG09
                         ;; size=33 bbWeight=1 PerfScore 9.00
-G_M62024_IG14:        ; bbWeight=1, gcVars=00000004 {V04}, gcrefRegs=00000080 {edi}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M62024_IG07:        ; bbWeight=1, gcVars=00000004 {V04}, gcrefRegs=00000008 {ebx}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs -[esi]
        ; GC ptr vars -{V03 V05 V06}
-       mov      ecx, edi
+       mov      ecx, ebx
        ; gcrRegs +[ecx]
        ; GC ptr vars -{V04}
        call     [<unknown method>]
-       ; gcrRegs -[ecx edi]
-       jmp      SHORT G_M62024_IG18
+       ; gcrRegs -[ecx ebx]
+       jmp      SHORT G_M62024_IG11
                         ;; size=10 bbWeight=1 PerfScore 5.25
-G_M62024_IG15:        ; bbWeight=1, gcVars=00002000 {V06}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
-       ; GC ptr vars +{V06 V13}
+G_M62024_IG08:        ; bbWeight=1, gcVars=00000100 {V06}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
+       ; GC ptr vars +{V06}
        mov      dword ptr [ebp-0x18], 0
-       jmp      SHORT G_M62024_IG20
+       jmp      SHORT G_M62024_IG13
                        ;; size=9 bbWeight=1 PerfScore 3.00
-G_M62024_IG16:        ; bbWeight=1, gcVars=00002004 {V04 V06}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
-       ; GC ptr vars -{V13} +{V02 V04}
-       mov      edi, gword ptr [ebp-0x24]
-       ; gcrRegs +[edi]
-       test     edi, edi
-       je       SHORT G_M62024_IG17
-       mov      ecx, edi
+G_M62024_IG09:        ; bbWeight=1, gcVars=00000104 {V04 V06}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
+       ; GC ptr vars +{V02 V04}
+       mov      ebx, gword ptr [ebp-0x24]
+       ; gcrRegs +[ebx]
+       test     ebx, ebx
+       je       SHORT G_M62024_IG10
+       mov      ecx, ebx
        ; gcrRegs +[ecx]
        ; GC ptr vars -{V02 V04}
        call     [<unknown method>]
-       ; gcrRegs -[ecx edi]
+       ; gcrRegs -[ecx ebx]
                      ;; size=15 bbWeight=1 PerfScore 5.50
-G_M62024_IG17:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M62024_IG10:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        pop      eax
        jmp      eax
                        ;; size=3 bbWeight=1 PerfScore 2.50
-G_M62024_IG18:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+G_M62024_IG11:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        ; GC ptr vars -{V06}
        mov      esi, bword ptr [ebp+0x0C]
        ; byrRegs +[esi]
@@ -191,7 +153,7 @@ G_M62024_IG18:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, b
        xor      eax, eax
        ; gcrRegs +[eax]
                        ;; size=8 bbWeight=1 PerfScore 2.25
-G_M62024_IG19:        ; bbWeight=1, epilog, nogc, extend
+G_M62024_IG12:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -199,14 +161,14 @@ G_M62024_IG19:        ; bbWeight=1, epilog, nogc, extend
        pop      ebp
        ret      8
                        ;; size=10 bbWeight=1 PerfScore 4.50
-G_M62024_IG20:        ; bbWeight=1, gcVars=00002000 {V06}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+G_M62024_IG13:        ; bbWeight=1, gcVars=00000100 {V06}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        ; gcrRegs -[eax]
        ; byrRegs -[esi]
-       ; GC ptr vars +{V06 V13}
+       ; GC ptr vars +{V06}
        mov      eax, gword ptr [ebp-0x2C]
        ; gcrRegs +[eax]
                        ;; size=3 bbWeight=1 PerfScore 1.00
-G_M62024_IG21:        ; bbWeight=1, epilog, nogc, extend
+G_M62024_IG14:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -214,22 +176,22 @@ G_M62024_IG21:        ; bbWeight=1, epilog, nogc, extend
        pop      ebp
...

libraries.pmi.windows.x86.checked.mch

-32 (-57.14%) : 4146.dasm - System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector1[long]):System.Numerics.Vector1double 

@@ -5,41 +5,27 @@
 ; esp based frame
 ; partially interruptible
 ; No matching PGO data
-; 0 inlinees with PGO data; 1 single block inlinees; 2 inlinees without PGO data
+; 0 inlinees with PGO data; 1 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 RetBuf       [V00,T00] (  3,  3   )   byref  ->  ecx         single-def
-;  V01 arg0         [V01,T01] (  2,  2   )  simd32  ->  mm0         single-def <System.Numerics.Vector`1[long]>
-;* V02 loc0         [V02    ] (  0,  0   )  simd32  ->  zero-ref    "spilled call-like call argument"
-;* V03 tmp1         [V03    ] (  0,  0   )  simd32  ->  zero-ref    "Inline return value spill temp" <System.Runtime.Intrinsics.Vector256`1[double]>
-;* V04 tmp2         [V04    ] (  0,  0   )  simd32  ->  zero-ref    "Inline stloc first use temp" <System.Runtime.Intrinsics.Vector256`1[int]>
-;* V05 tmp3         [V05    ] (  0,  0   )  simd32  ->  zero-ref    "Inline stloc first use temp" <System.Runtime.Intrinsics.Vector256`1[long]>
-;* V06 tmp4         [V06    ] (  0,  0   )  simd32  ->  zero-ref    "Inline stloc first use temp" <System.Runtime.Intrinsics.Vector256`1[double]>
+;  V01 arg0         [V01,T01] (  1,  1   )  simd32  ->  [esp+0x04]  single-def <System.Numerics.Vector`1[long]>
 ;
 ; Lcl frame size = 0
 
 G_M18713_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
        vzeroupper 
-       vmovups  ymm0, ymmword ptr [esp+0x04]
-                       ;; size=9 bbWeight=1 PerfScore 5.00
+                       ;; size=3 bbWeight=1 PerfScore 1.00
 G_M18713_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000002 {ecx}, byref
        ; byrRegs +[ecx]
-       vpblendd ymm1, ymm0, ymmword ptr [@RWD00], -86
-       vpsrlq   ymm0, ymm0, 32
-       vpxor    ymm0, ymm0, ymmword ptr [@RWD32]
-       vsubpd   ymm0, ymm0, qword ptr [@RWD64] {1to4}
-       vaddpd   ymm0, ymm1, ymm0
+       vcvtqq2pd ymm0, ymmword ptr [esp+0x04]
        vmovups  ymmword ptr [ecx], ymm0
-                       ;; size=41 bbWeight=1 PerfScore 17.00
+                     ;; size=15 bbWeight=1 PerfScore 7.00
 G_M18713_IG03:        ; bbWeight=1, epilog, nogc, extend
        vzeroupper 
        ret      32
                        ;; size=6 bbWeight=1 PerfScore 3.00
-RWD00      dq  4330000000000000h, 4330000000000000h, 4330000000000000h, 4330000000000000h
-RWD32      dq  4530000080000000h, 4530000080000000h, 4530000080000000h, 4530000080000000h
-RWD64      dq  4530000080100000h   ; 1.93428223e+25
 
-
-; Total bytes of code 56, prolog size 3, PerfScore 25.00, instruction count 10, allocated bytes for code 56 (MethodHash=94cdb6e6) for method System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector`1[long]):System.Numerics.Vector`1[double] (FullOpts)
+; Total bytes of code 24, prolog size 3, PerfScore 11.00, instruction count 5, allocated bytes for code 24 (MethodHash=94cdb6e6) for method System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector`1[long]):System.Numerics.Vector`1[double] (FullOpts)
 ; ============================================================

-32 (-57.14%) : 4147.dasm - System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector1[ulong]):System.Numerics.Vector1double 

@@ -5,41 +5,27 @@
 ; esp based frame
 ; partially interruptible
 ; No matching PGO data
-; 0 inlinees with PGO data; 1 single block inlinees; 2 inlinees without PGO data
+; 0 inlinees with PGO data; 1 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 RetBuf       [V00,T00] (  3,  3   )   byref  ->  ecx         single-def
-;  V01 arg0         [V01,T01] (  2,  2   )  simd32  ->  mm0         single-def <System.Numerics.Vector`1[ulong]>
-;* V02 loc0         [V02    ] (  0,  0   )  simd32  ->  zero-ref    "spilled call-like call argument"
-;* V03 tmp1         [V03    ] (  0,  0   )  simd32  ->  zero-ref    "Inline return value spill temp" <System.Runtime.Intrinsics.Vector256`1[double]>
-;* V04 tmp2         [V04    ] (  0,  0   )  simd32  ->  zero-ref    "Inline stloc first use temp" <System.Runtime.Intrinsics.Vector256`1[uint]>
-;* V05 tmp3         [V05    ] (  0,  0   )  simd32  ->  zero-ref    "Inline stloc first use temp" <System.Runtime.Intrinsics.Vector256`1[ulong]>
-;* V06 tmp4         [V06    ] (  0,  0   )  simd32  ->  zero-ref    "Inline stloc first use temp" <System.Runtime.Intrinsics.Vector256`1[double]>
+;  V01 arg0         [V01,T01] (  1,  1   )  simd32  ->  [esp+0x04]  single-def <System.Numerics.Vector`1[ulong]>
 ;
 ; Lcl frame size = 0
 
 G_M56524_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
        vzeroupper 
-       vmovups  ymm0, ymmword ptr [esp+0x04]
-                       ;; size=9 bbWeight=1 PerfScore 5.00
+                       ;; size=3 bbWeight=1 PerfScore 1.00
 G_M56524_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000002 {ecx}, byref
        ; byrRegs +[ecx]
-       vpblendd ymm1, ymm0, ymmword ptr [@RWD00], -86
-       vpsrlq   ymm0, ymm0, 32
-       vpxor    ymm0, ymm0, ymmword ptr [@RWD32]
-       vsubpd   ymm0, ymm0, qword ptr [@RWD64] {1to4}
-       vaddpd   ymm0, ymm1, ymm0
+       vcvtuqq2pd ymm0, ymmword ptr [esp+0x04]
        vmovups  ymmword ptr [ecx], ymm0
-                      ;; size=41 bbWeight=1 PerfScore 17.00
+                     ;; size=15 bbWeight=1 PerfScore 7.00
 G_M56524_IG03:        ; bbWeight=1, epilog, nogc, extend
        vzeroupper 
        ret      32
                        ;; size=6 bbWeight=1 PerfScore 3.00
-RWD00      dq  4330000000000000h, 4330000000000000h, 4330000000000000h, 4330000000000000h
-RWD32      dq  4530000000000000h, 4530000000000000h, 4530000000000000h, 4530000000000000h
-RWD64      dq  4530000000100000h   ; 1.93428131e+25
 
-
-; Total bytes of code 56, prolog size 3, PerfScore 25.00, instruction count 10, allocated bytes for code 56 (MethodHash=23b22333) for method System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector`1[ulong]):System.Numerics.Vector`1[double] (FullOpts)
+; Total bytes of code 24, prolog size 3, PerfScore 11.00, instruction count 5, allocated bytes for code 24 (MethodHash=23b22333) for method System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector`1[ulong]):System.Numerics.Vector`1[double] (FullOpts)
 ; ============================================================

-26 (-39.39%) : 3563.dasm - System.TupleExtensions:ToTuple[System.Canon,System.Nullable1[int]](System.ValueTuple2[System.Canon,System.Nullable1[int]]):System.Tuple2[System.__Canon,System.Nullable`1[int]] (FullOpts) 

@@ -7,54 +7,36 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 arg0         [V00,T05] (  2,  2   )  struct (12) [ebp+0x08]  do-not-enreg[SF] single-def <System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]>
-;  V01 TypeCtx      [V01,T00] (  5,  4.20)     int  ->  ecx         single-def
+;  V00 arg0         [V00,T02] (  2,  2   )  struct (12) [ebp+0x08]  do-not-enreg[SF] single-def <System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]>
+;  V01 TypeCtx      [V01,T00] (  4,  4   )     int  ->  ecx         single-def
 ;* V02 loc0         [V02    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V03 tmp1         [V03,T03] (  2,  4   )     int  ->  edx         "argument with side effect"
-;  V04 rat0         [V04,T04] (  2,  4   )  struct ( 8) [ebp-0x0C]  do-not-enreg[SB] "Spilling to split statement for tree" <System.Nullable`1[int]>
-;  V05 rat1         [V05,T02] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V06 rat2         [V06,T01] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V03 tmp1         [V03,T01] (  2,  4   )     int  ->  edx         "argument with side effect"
 ;
-; Lcl frame size = 12
+; Lcl frame size = 4
 
 G_M8952_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
        push     ebp
        mov      ebp, esp
-       sub      esp, 12
+       push     eax
        mov      dword ptr [ebp-0x04], ecx
-                      ;; size=9 bbWeight=1 PerfScore 2.50
-G_M8952_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, dword ptr [ebp+0x0C]
-       mov      dword ptr [ebp-0x0C], edx
-       mov      edx, dword ptr [ebp+0x10]
-       mov      dword ptr [ebp-0x08], edx
-       mov      edx, dword ptr [ecx+0x20]
-       mov      edx, dword ptr [edx+0x0C]
-       test     edx, edx
-       je       SHORT G_M8952_IG04
-                       ;; size=22 bbWeight=1 PerfScore 9.25
-G_M8952_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M8952_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M8952_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+                        ;; size=7 bbWeight=1 PerfScore 3.25
+G_M8952_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+       push     dword ptr [ebp+0x10]
+       push     dword ptr [ebp+0x0C]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      edx, eax
-                        ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M8952_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       push     dword ptr [ebp-0x08]
-       push     dword ptr [ebp-0x0C]
        mov      ecx, gword ptr [ebp+0x08]
        ; gcrRegs +[ecx]
        call     [System.Tuple:Create[System.__Canon,System.Nullable`1[int]](System.__Canon,System.Nullable`1[int]):System.Tuple`2[System.__Canon,System.Nullable`1[int]]]
        ; gcrRegs -[ecx] +[eax]
-                       ;; size=15 bbWeight=1 PerfScore 6.00
-G_M8952_IG06:        ; bbWeight=1, epilog, nogc, extend
+                      ;; size=27 bbWeight=1 PerfScore 7.50
+G_M8952_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      12
                        ;; size=6 bbWeight=1 PerfScore 2.75
 
-; Total bytes of code 66, prolog size 9, PerfScore 22.40, instruction count 23, allocated bytes for code 66 (MethodHash=0017dd07) for method System.TupleExtensions:ToTuple[System.__Canon,System.Nullable`1[int]](System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]):System.Tuple`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
+; Total bytes of code 40, prolog size 7, PerfScore 13.50, instruction count 14, allocated bytes for code 40 (MethodHash=0017dd07) for method System.TupleExtensions:ToTuple[System.__Canon,System.Nullable`1[int]](System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]):System.Tuple`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
 ; ============================================================

+24 (+9.52%) : 22172.dasm - .$Map:loop@860-43[System.Canon,System.Nullable1[int]](System.Collections.Generic.IEnumerator1[System.Collections.Generic.KeyValuePair`2[System.Canon,System.Nullable1[int]]],System.Collections.Generic.IEnumerator1[System.Collections.Generic.KeyValuePair2[System.__Canon,System.Nullable1[int]]],Microsoft.FSharp.Core.Unit):ubyte (FullOpts) 

@@ -8,39 +8,32 @@
 ; 0 inlinees with PGO data; 4 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 arg0         [V00,T04] (  4, 14   )     ref  ->  esi         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]]>
-;  V01 arg1         [V01,T05] (  4, 14   )     ref  ->  edi         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]]>
+;  V00 arg0         [V00,T02] (  4, 14   )     ref  ->  edi         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]]>
+;  V01 arg1         [V01,T03] (  4, 14   )     ref  ->  ebx         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]]>
 ;* V02 arg2         [V02    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def <Microsoft.FSharp.Core.Unit>
-;  V03 TypeCtx      [V03,T13] (  5, 11.24)     int  ->  ebx         single-def
-;  V04 loc0         [V04,T02] (  3, 20   )   ubyte  ->  [ebp-0x14]  spill-single-def
+;  V03 TypeCtx      [V03,T00] (  8, 29   )     int  ->  esi         single-def
+;  V04 loc0         [V04,T01] (  3, 20   )   ubyte  ->  [ebp-0x14]  spill-single-def
 ;* V05 loc1         [V05    ] (  0,  0   )   ubyte  ->  zero-ref   
-;  V06 loc2         [V06    ] (  3, 12   )  struct (12) [ebp-0x20]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]>
+;  V06 loc2         [V06    ] (  4, 16   )  struct (12) [ebp-0x20]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]>
 ;  V07 loc3         [V07    ] (  3, 12   )  struct (12) [ebp-0x2C]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]>
-;* V08 loc4         [V08    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <System.__Canon>
+;  V08 loc4         [V08,T07] (  2,  8   )     ref  ->  [ebp-0x38]  class-hnd spill-single-def <System.__Canon>
 ;* V09 loc5         [V09    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <System.__Canon>
 ;* V10 loc6         [V10    ] (  0,  0   )  struct ( 8) zero-ref    <System.Nullable`1[int]>
 ;* V11 loc7         [V11    ] (  0,  0   )  struct ( 8) zero-ref    <System.Nullable`1[int]>
 ;* V12 loc8         [V12    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V13 tmp1         [V13,T10] (  2, 16   )     int  ->  [ebp-0x30]  spill-single-def "VirtualCall with runtime lookup"
+;  V13 tmp1         [V13,T05] (  2, 16   )     int  ->  eax         "VirtualCall with runtime lookup"
 ;* V14 tmp2         [V14    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V15 tmp3         [V15,T11] (  2, 16   )     int  ->  eax         "VirtualCall with runtime lookup"
+;  V15 tmp3         [V15,T06] (  2, 16   )     int  ->  eax         "VirtualCall with runtime lookup"
 ;* V16 tmp4         [V16    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V17 tmp5         [V17    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V18 tmp6         [V18    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V19 tmp7         [V19    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V20 tmp8         [V20    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;* V21 tmp9         [V21    ] (  0,  0   )   ubyte  ->  zero-ref    "field V10.hasValue (fldOffset=0x0)" P-INDEP
-;* V22 tmp10        [V22    ] (  0,  0   )     int  ->  zero-ref    "field V10.value (fldOffset=0x4)" P-INDEP
+;  V21 tmp9         [V21,T08] (  2,  8   )   ubyte  ->  [ebp-0x30]  spill-single-def "field V10.hasValue (fldOffset=0x0)" P-INDEP
+;  V22 tmp10        [V22,T09] (  2,  8   )     int  ->  [ebp-0x34]  spill-single-def "field V10.value (fldOffset=0x4)" P-INDEP
 ;* V23 tmp11        [V23    ] (  0,  0   )   ubyte  ->  zero-ref    "field V11.hasValue (fldOffset=0x0)" P-INDEP
 ;* V24 tmp12        [V24    ] (  0,  0   )     int  ->  zero-ref    "field V11.value (fldOffset=0x4)" P-INDEP
-;  V25 tmp13        [V25,T08] (  2, 16   )     ref  ->  [ebp-0x38]  spill-single-def "argument with side effect"
-;  V26 tmp14        [V26,T09] (  2, 16   )     ref  ->  [ebp-0x3C]  spill-single-def "argument with side effect"
-;  V27 cse0         [V27,T12] (  3, 12   )     int  ->  [ebp-0x34]  spill-single-def "CSE - moderate"
-;  V28 rat0         [V28,T06] (  3, 16   )     int  ->  eax         "runtime lookup"
-;  V29 rat1         [V29,T00] (  3, 22.40)     int  ->  eax         "fgMakeTemp is creating a new local variable"
-;  V30 rat2         [V30,T07] (  3, 16   )     int  ->  ecx         "runtime lookup"
-;  V31 rat3         [V31,T01] (  3, 22.40)     int  ->  ecx         "spilling expr"
-;  V32 rat4         [V32,T03] (  3, 17.92)     int  ->  ecx         "fgMakeTemp is creating a new local variable"
+;  V25 tmp13        [V25,T04] (  2, 16   )     ref  ->  [ebp-0x3C]  spill-single-def "argument with side effect"
 ;
 ; Lcl frame size = 48
 
@@ -58,115 +51,99 @@ G_M23959_IG01:        ; bbWeight=8, gcVars=00000000 {}, gcrefRegs=00000000 {}, b
        mov      dword ptr [ebp-0x18], eax
        mov      eax, dword ptr [ebp+0x08]
        mov      dword ptr [ebp-0x10], eax
-       mov      esi, ecx
-       ; gcrRegs +[esi]
-       mov      edi, edx
+       mov      edi, ecx
        ; gcrRegs +[edi]
-       mov      ebx, dword ptr [ebp+0x08]
+       mov      ebx, edx
+       ; gcrRegs +[ebx]
+       mov      esi, dword ptr [ebp+0x08]
                       ;; size=39 bbWeight=8 PerfScore 108.67
-G_M23959_IG02:        ; bbWeight=8, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       mov      ecx, esi
+G_M23959_IG02:        ; bbWeight=8, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref
+       mov      ecx, edi
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        mov      dword ptr [ebp-0x14], eax
-       mov      ecx, edi
+       mov      ecx, ebx
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        mov      ecx, dword ptr [ebp-0x14]
        cmp      eax, ecx
-       jne      G_M23959_IG11
+       jne      G_M23959_IG04
                      ;; size=30 bbWeight=8 PerfScore 78.00
-G_M23959_IG03:        ; bbWeight=4, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
+G_M23959_IG03:        ; bbWeight=4, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
        test     ecx, ecx
-       je       G_M23959_IG13
-       mov      ecx, dword ptr [ebx+0x20]
-       mov      eax, dword ptr [ecx+0x0C]
-       test     eax, eax
-       je       SHORT G_M23959_IG05
-                       ;; size=18 bbWeight=4 PerfScore 26.00
-G_M23959_IG04:        ; bbWeight=3.20, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M23959_IG06
-                       ;; size=2 bbWeight=3.20 PerfScore 6.40
-G_M23959_IG05:        ; bbWeight=0.80, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       mov      ecx, ebx
-       mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=12 bbWeight=0.80 PerfScore 1.20
-G_M23959_IG06:        ; bbWeight=4, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      dword ptr [ebp-0x34], eax
-       mov      dword ptr [ebp-0x30], eax
-       lea      edx, [ebp-0x20]
+       je       G_M23959_IG06
        mov      ecx, esi
-       ; gcrRegs +[ecx]
-       mov      eax, dword ptr [ebp-0x30]
-       nop      
-       call     [eax]
-       ; gcrRegs -[ecx]
-       mov      eax, dword ptr [ebp-0x34]
-       lea      edx, [ebp-0x2C]
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       lea      edx, [ebp-0x20]
        mov      ecx, edi
        ; gcrRegs +[ecx]
        nop      
        call     [eax]
        ; gcrRegs -[ecx]
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       lea      edx, [ebp-0x2C]
+       mov      ecx, ebx
+       ; gcrRegs +[ecx]
+       nop      
+       call     [eax]
+       ; gcrRegs -[ecx]
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
        mov      eax, gword ptr [ebp-0x20]
        ; gcrRegs +[eax]
-       mov      gword ptr [ebp-0x3C], eax
-       ; GC ptr vars +{V26}
-       mov      edx, gword ptr [ebp-0x2C]
-       ; gcrRegs +[edx]
-       mov      gword ptr [ebp-0x38], edx
-       ; GC ptr vars +{V25}
-       mov      ecx, dword ptr [ebx+0x20]
-       cmp      dword ptr [ecx+0x08], 20
-       jle      SHORT G_M23959_IG09
-                       ;; size=53 bbWeight=4 PerfScore 88.00
-G_M23959_IG07:        ; bbWeight=3.20, gcVars=00000300 {V25 V26}, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
-       ; gcrRegs -[eax edx]
-       mov      eax, gword ptr [ebp-0x3C]
-       ; gcrRegs +[eax]
-       mov      ecx, dword ptr [ecx+0x14]
-       test     ecx, ecx
-       je       SHORT G_M23959_IG09
-                       ;; size=10 bbWeight=3.20 PerfScore 13.60
-G_M23959_IG08:        ; bbWeight=2.56, gcrefRegs=000000C1 {eax esi edi}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M23959_IG10
-                       ;; size=2 bbWeight=2.56 PerfScore 5.12
-G_M23959_IG09:        ; bbWeight=1.44, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[eax]
-       mov      ecx, ebx
+       mov      gword ptr [ebp-0x38], eax
+       ; GC ptr vars +{V08}
+       mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      ecx, eax
-       mov      eax, gword ptr [ebp-0x3C]
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
+       mov      eax, gword ptr [ebp-0x2C]
        ; gcrRegs +[eax]
-                     ;; size=17 bbWeight=1.44 PerfScore 3.96
-G_M23959_IG10:        ; bbWeight=4, gcrefRegs=000000C1 {eax esi edi}, byrefRegs=00000000 {}, byref, isz
-       push     ecx
-       mov      edx, gword ptr [ebp-0x38]
+       mov      gword ptr [ebp-0x3C], eax
+       ; GC ptr vars +{V25}
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
+       push     eax
+       mov      edx, gword ptr [ebp-0x3C]
        ; gcrRegs +[edx]
-       mov      ecx, eax
+       mov      ecx, gword ptr [ebp-0x38]
        ; gcrRegs +[ecx]
-       ; GC ptr vars -{V25 V26}
+       ; GC ptr vars -{V08 V25}
        call     [<unknown method>]
-       ; gcrRegs -[eax ecx edx]
+       ; gcrRegs -[ecx edx]
        test     eax, eax
-       je       SHORT G_M23959_IG11
-       push     dword ptr [ebp-0x18]
-       push     dword ptr [ebp-0x1C]
+       je       SHORT G_M23959_IG04
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       movzx    eax, byte  ptr [ebp-0x1C]
+       mov      byte  ptr [ebp-0x30], al
+       mov      edx, dword ptr [ebp-0x18]
+       mov      dword ptr [ebp-0x34], edx
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       push     dword ptr [ebp-0x34]
+       push     dword ptr [ebp-0x30]
        push     dword ptr [ebp-0x24]
        push     dword ptr [ebp-0x28]
        call     [<unknown method>]
        test     eax, eax
        jne      G_M23959_IG02
-                        ;; size=42 bbWeight=4 PerfScore 59.00
-G_M23959_IG11:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[esi edi]
+                      ;; size=180 bbWeight=4 PerfScore 173.00
+G_M23959_IG04:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[ebx edi]
        xor      eax, eax
                        ;; size=2 bbWeight=0.50 PerfScore 0.12
-G_M23959_IG12:        ; bbWeight=0.50, epilog, nogc, extend
+G_M23959_IG05:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -174,10 +151,10 @@ G_M23959_IG12:        ; bbWeight=0.50, epilog, nogc, extend
        pop      ebp
        ret      8
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
-G_M23959_IG13:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+G_M23959_IG06:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        mov      eax, 1
                        ;; size=5 bbWeight=0.50 PerfScore 0.12
-G_M23959_IG14:        ; bbWeight=0.50, epilog, nogc, extend
+G_M23959_IG07:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -186,6 +163,6 @@ G_M23959_IG14:        ; bbWeight=0.50, epilog, nogc, extend
        ret      8
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
 
-; Total bytes of code 252, prolog size 32, PerfScore 394.70, instruction count 90, allocated bytes for code 252 (MethodHash=2ed0a268) for method <StartupCode$FSharp-Core>.$Map:loop@860-43[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],Microsoft.FSharp.Core.Unit):ubyte (FullOpts)
+; Total bytes of code 276, prolog size 32, PerfScore 364.42, instruction count 90, allocated bytes for code 276 (MethodHash=2ed0a268) for method <StartupCode$FSharp-Core>.$Map:loop@860-43[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],Microsoft.FSharp.Core.Unit):ubyte (FullOpts)
 ; ============================================================

+36 (+13.74%) : 4142.dasm - System.Numerics.Vector:ConditionalSelectSystem.__Canon:System.Numerics.Vector`1System.__Canon 

@@ -7,58 +7,49 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 RetBuf       [V00,T04] (  3,  3   )   byref  ->  esi         single-def
-;  V01 arg0         [V01,T14] (  2,  2   )  struct (32) [ebp+0x48]  do-not-enreg[S] single-def <System.Numerics.Vector`1[System.__Canon]>
-;  V02 arg1         [V02,T16] (  1,  1   )  struct (32) [ebp+0x28]  do-not-enreg[S] single-def <System.Numerics.Vector`1[System.__Canon]>
-;  V03 arg2         [V03,T17] (  1,  1   )  struct (32) [ebp+0x08]  do-not-enreg[S] single-def <System.Numerics.Vector`1[System.__Canon]>
-;  V04 TypeCtx      [V04,T00] (  5,  4.20)     int  ->  edx         single-def
-;* V05 loc0         [V05,T15] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V06 loc1         [V06,T06] (  2,  4   )     int  ->  edx         "spilling helperCall"
-;  V07 tmp2         [V07    ] (  2,  4   )  struct (32) [ebp-0x2C]  do-not-enreg[HS] hidden-struct-arg "impAppendStmt" <System.Numerics.Vector`1[System.__Canon]>
-;  V08 tmp3         [V08,T07] (  2,  4   )     int  ->  edx         "spilling helperCall"
-;  V09 tmp4         [V09    ] (  2,  4   )  struct (32) [ebp-0x4C]  do-not-enreg[HS] hidden-struct-arg "spilled call-like call argument" <System.Numerics.Vector`1[System.__Canon]>
-;  V10 tmp5         [V10,T01] (  3,  6   )     int  ->  edi         "spilling helperCall"
-;  V11 tmp6         [V11    ] (  2,  4   )  struct (32) [ebp-0x6C]  do-not-enreg[HS] hidden-struct-arg "spilled call-like call argument" <System.Numerics.Vector`1[System.__Canon]>
-;  V12 tmp7         [V12,T08] (  2,  4   )    long  ->  [ebp-0x2C]  do-not-enreg[H] hidden-struct-arg "field V07._00 (fldOffset=0x0)" P-DEP
-;  V13 tmp8         [V13,T09] (  2,  4   )    long  ->  [ebp-0x24]  do-not-enreg[H] hidden-struct-arg "field V07._01 (fldOffset=0x8)" P-DEP
-;  V14 tmp9         [V14,T10] (  2,  4   )    long  ->  [ebp-0x4C]  do-not-enreg[H] hidden-struct-arg "field V09._00 (fldOffset=0x0)" P-DEP
-;  V15 tmp10        [V15,T11] (  2,  4   )    long  ->  [ebp-0x44]  do-not-enreg[H] hidden-struct-arg "field V09._01 (fldOffset=0x8)" P-DEP
-;  V16 tmp11        [V16,T12] (  2,  4   )    long  ->  [ebp-0x6C]  do-not-enreg[H] hidden-struct-arg "field V11._00 (fldOffset=0x0)" P-DEP
-;  V17 tmp12        [V17,T13] (  2,  4   )    long  ->  [ebp-0x64]  do-not-enreg[H] hidden-struct-arg "field V11._01 (fldOffset=0x8)" P-DEP
-;  V18 cse0         [V18,T03] (  4,  4   )     int  ->  edi         "CSE - aggressive"
-;  V19 rat0         [V19,T05] (  3,  4   )     int  ->  edi         "runtime lookup"
-;  V20 rat1         [V20,T02] (  3,  5.60)     int  ->  edi         "fgMakeTemp is creating a new local variable"
+;  V00 RetBuf       [V00,T01] (  3,  3   )   byref  ->  edi         single-def
+;  V01 arg0         [V01,T12] (  2,  2   )  struct (32) [ebp+0x48]  do-not-enreg[S] single-def <System.Numerics.Vector`1[System.__Canon]>
+;  V02 arg1         [V02,T13] (  1,  1   )  struct (32) [ebp+0x28]  do-not-enreg[S] single-def <System.Numerics.Vector`1[System.__Canon]>
+;  V03 arg2         [V03,T14] (  1,  1   )  struct (32) [ebp+0x08]  do-not-enreg[S] single-def <System.Numerics.Vector`1[System.__Canon]>
+;  V04 TypeCtx      [V04,T00] (  7,  7   )     int  ->  esi         single-def
+;  V05 loc0         [V05,T02] (  2,  4   )     int  ->  ebx         "spilling helperCall"
+;  V06 loc1         [V06,T03] (  2,  4   )     int  ->  [ebp-0x14]  spill-single-def "spilling helperCall"
+;  V07 tmp2         [V07    ] (  2,  4   )  struct (32) [ebp-0x34]  do-not-enreg[HS] hidden-struct-arg "impAppendStmt" <System.Numerics.Vector`1[System.__Canon]>
+;  V08 tmp3         [V08,T04] (  2,  4   )     int  ->  ebx         "spilling helperCall"
+;  V09 tmp4         [V09    ] (  2,  4   )  struct (32) [ebp-0x54]  do-not-enreg[HS] hidden-struct-arg "spilled call-like call argument" <System.Numerics.Vector`1[System.__Canon]>
+;  V10 tmp5         [V10,T05] (  2,  4   )     int  ->  esi         "spilling helperCall"
+;  V11 tmp6         [V11    ] (  2,  4   )  struct (32) [ebp-0x74]  do-not-enreg[HS] hidden-struct-arg "spilled call-like call argument" <System.Numerics.Vector`1[System.__Canon]>
+;  V12 tmp7         [V12,T06] (  2,  4   )    long  ->  [ebp-0x34]  do-not-enreg[H] hidden-struct-arg "field V07._00 (fldOffset=0x0)" P-DEP
+;  V13 tmp8         [V13,T07] (  2,  4   )    long  ->  [ebp-0x2C]  do-not-enreg[H] hidden-struct-arg "field V07._01 (fldOffset=0x8)" P-DEP
+;  V14 tmp9         [V14,T08] (  2,  4   )    long  ->  [ebp-0x54]  do-not-enreg[H] hidden-struct-arg "field V09._00 (fldOffset=0x0)" P-DEP
+;  V15 tmp10        [V15,T09] (  2,  4   )    long  ->  [ebp-0x4C]  do-not-enreg[H] hidden-struct-arg "field V09._01 (fldOffset=0x8)" P-DEP
+;  V16 tmp11        [V16,T10] (  2,  4   )    long  ->  [ebp-0x74]  do-not-enreg[H] hidden-struct-arg "field V11._00 (fldOffset=0x0)" P-DEP
+;  V17 tmp12        [V17,T11] (  2,  4   )    long  ->  [ebp-0x6C]  do-not-enreg[H] hidden-struct-arg "field V11._01 (fldOffset=0x8)" P-DEP
 ;
-; Lcl frame size = 100
+; Lcl frame size = 104
 
 G_M60713_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
        push     ebp
        mov      ebp, esp
        push     edi
        push     esi
-       sub      esp, 100
+       push     ebx
+       sub      esp, 104
        vzeroupper 
-       mov      dword ptr [ebp-0x0C], edx
-       mov      esi, ecx
-       ; byrRegs +[esi]
-                       ;; size=16 bbWeight=1 PerfScore 5.75
-G_M60713_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
-       mov      ecx, dword ptr [edx+0x20]
-       mov      edi, dword ptr [ecx+0x08]
-       test     edi, edi
-       je       SHORT G_M60713_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M60713_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
-       jmp      SHORT G_M60713_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M60713_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
-       mov      ecx, edx
+       mov      dword ptr [ebp-0x10], edx
+       mov      edi, ecx
+       ; byrRegs +[edi]
+       mov      esi, edx
+                       ;; size=19 bbWeight=1 PerfScore 7.00
+G_M60713_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000080 {edi}, byref
+       mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edi, eax
-                       ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M60713_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
-       mov      edx, edi
+       call     CORINFO_HELP_MEMCPY
+       mov      ebx, eax
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x14], eax
        sub      esp, 32
        vmovdqu  xmm0, xmmword ptr [ebp+0x28]
        vmovdqu  xmmword ptr [esp], xmm0
@@ -69,53 +60,65 @@ G_M60713_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {e
        vmovdqu  xmmword ptr [esp], xmm0
        vmovdqu  xmm0, xmmword ptr [ebp+0x58]
        vmovdqu  xmmword ptr [esp+0x10], xmm0
-       lea      ecx, [ebp-0x2C]
+       lea      ecx, [ebp-0x34]
+       mov      edx, ebx
        call     [System.Numerics.Vector`1[System.__Canon]:op_BitwiseAnd(System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon]]
-       mov      edx, edi
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      ebx, eax
        sub      esp, 32
        vmovdqu  xmm0, xmmword ptr [ebp+0x48]
        vmovdqu  xmmword ptr [esp], xmm0
        vmovdqu  xmm0, xmmword ptr [ebp+0x58]
        vmovdqu  xmmword ptr [esp+0x10], xmm0
-       lea      ecx, [ebp-0x4C]
+       lea      ecx, [ebp-0x54]
+       mov      edx, dword ptr [ebp-0x14]
        call     [System.Numerics.Vector`1[System.__Canon]:op_OnesComplement(System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon]]
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      esi, eax
        sub      esp, 32
        vmovdqu  xmm0, xmmword ptr [ebp+0x08]
        vmovdqu  xmmword ptr [esp], xmm0
        vmovdqu  xmm0, xmmword ptr [ebp+0x18]
        vmovdqu  xmmword ptr [esp+0x10], xmm0
        sub      esp, 32
-       vmovdqu  xmm0, xmmword ptr [ebp-0x4C]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x54]
        vmovdqu  xmmword ptr [esp], xmm0
-       vmovdqu  xmm0, xmmword ptr [ebp-0x3C]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x44]
        vmovdqu  xmmword ptr [esp+0x10], xmm0
-       lea      ecx, [ebp-0x6C]
-       mov      edx, edi
+       lea      ecx, [ebp-0x74]
+       mov      edx, ebx
        call     [System.Numerics.Vector`1[System.__Canon]:op_BitwiseAnd(System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon]]
        sub      esp, 32
-       vmovdqu  xmm0, xmmword ptr [ebp-0x2C]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x34]
        vmovdqu  xmmword ptr [esp], xmm0
-       vmovdqu  xmm0, xmmword ptr [ebp-0x1C]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x24]
+                       ;; size=229 bbWeight=1 PerfScore 79.25
+G_M60713_IG03:        ; bbWeight=1, extend
        vmovdqu  xmmword ptr [esp+0x10], xmm0
        sub      esp, 32
-       vmovdqu  xmm0, xmmword ptr [ebp-0x6C]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x74]
        vmovdqu  xmmword ptr [esp], xmm0
-       vmovdqu  xmm0, xmmword ptr [ebp-0x5C]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x64]
        vmovdqu  xmmword ptr [esp+0x10], xmm0
-       mov      ecx, esi
+       mov      ecx, edi
        ; byrRegs +[ecx]
-       mov      edx, edi
+       mov      edx, esi
        call     [System.Numerics.Vector`1[System.__Canon]:op_BitwiseOr(System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon]]
-       ; byrRegs -[ecx esi]
-                       ;; size=211 bbWeight=1 PerfScore 86.50
-G_M60713_IG06:        ; bbWeight=1, epilog, nogc, extend
-       lea      esp, [ebp-0x08]
+       ; byrRegs -[ecx edi]
+                       ;; size=40 bbWeight=1 PerfScore 15.75
+G_M60713_IG04:        ; bbWeight=1, epilog, nogc, extend
+       lea      esp, [ebp-0x0C]
+       pop      ebx
        pop      esi
        pop      edi
        pop      ebp
        ret      96
-                       ;; size=9 bbWeight=1 PerfScore 4.00
+                       ;; size=10 bbWeight=1 PerfScore 4.50
 
-; Total bytes of code 262, prolog size 14, PerfScore 103.45, instruction count 69, allocated bytes for code 262 (MethodHash=badf12d6) for method System.Numerics.Vector:ConditionalSelect[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
+; Total bytes of code 298, prolog size 15, PerfScore 106.50, instruction count 79, allocated bytes for code 298 (MethodHash=badf12d6) for method System.Numerics.Vector:ConditionalSelect[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
 ; ============================================================

+31 (+16.06%) : 4154.dasm - System.Numerics.Vector:CreateSequenceSystem.__Canon:System.Numerics.Vector`1System.__Canon 

@@ -7,28 +7,25 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 RetBuf       [V00,T03] (  3,  3   )   byref  ->  esi         single-def
-;  V01 arg0         [V01,T04] (  3,  3   )     ref  ->  edi         class-hnd single-def <System.__Canon>
-;  V02 arg1         [V02,T14] (  1,  1   )     ref  ->  [ebp+0x0C]  class-hnd single-def <System.__Canon>
-;  V03 TypeCtx      [V03,T12] (  3,  2.20)     int  ->  ecx         single-def
-;* V04 loc0         [V04,T13] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V05 loc1         [V05,T06] (  2,  4   )     int  ->  edx         "spilling helperCall"
-;  V06 tmp2         [V06    ] (  2,  4   )  struct (32) [ebp-0x30]  do-not-enreg[HS] hidden-struct-arg "spilled call-like call argument" <System.Numerics.Vector`1[System.__Canon]>
-;  V07 tmp3         [V07    ] (  3,  6   )  struct (32) [ebp-0x50]  do-not-enreg[XS] addr-exposed ld-addr-op "NewObj constructor temp" <System.Numerics.Vector`1[System.__Canon]>
-;  V08 tmp4         [V08,T00] (  3,  6   )     int  ->  [ebp-0x54]  spill-single-def "spilling helperCall"
-;  V09 tmp5         [V09    ] (  2,  4   )  struct (32) [ebp-0x74]  do-not-enreg[HS] hidden-struct-arg "impAppendStmt" <System.Numerics.Vector`1[System.__Canon]>
-;  V10 tmp6         [V10,T07] (  2,  4   )     int  ->  edx         "spilling helperCall"
-;  V11 tmp7         [V11,T08] (  2,  4   )    long  ->  [ebp-0x30]  do-not-enreg[H] hidden-struct-arg "field V06._00 (fldOffset=0x0)" P-DEP
-;  V12 tmp8         [V12,T09] (  2,  4   )    long  ->  [ebp-0x28]  do-not-enreg[H] hidden-struct-arg "field V06._01 (fldOffset=0x8)" P-DEP
-;  V13 tmp9         [V13    ] (  3,  6   )    long  ->  [ebp-0x50]  do-not-enreg[X] addr-exposed "field V07._00 (fldOffset=0x0)" P-DEP
-;  V14 tmp10        [V14    ] (  3,  6   )    long  ->  [ebp-0x48]  do-not-enreg[X] addr-exposed "field V07._01 (fldOffset=0x8)" P-DEP
-;  V15 tmp11        [V15,T10] (  2,  4   )    long  ->  [ebp-0x74]  do-not-enreg[H] hidden-struct-arg "field V09._00 (fldOffset=0x0)" P-DEP
-;  V16 tmp12        [V16,T11] (  2,  4   )    long  ->  [ebp-0x6C]  do-not-enreg[H] hidden-struct-arg "field V09._01 (fldOffset=0x8)" P-DEP
-;  V17 cse0         [V17,T02] (  4,  4   )     int  ->  ebx         "CSE - aggressive"
-;  V18 rat0         [V18,T05] (  3,  4   )     int  ->  ebx         "runtime lookup"
-;  V19 rat1         [V19,T01] (  3,  5.60)     int  ->  ebx         "fgMakeTemp is creating a new local variable"
+;  V00 RetBuf       [V00,T01] (  3,  3   )   byref  ->  edi         single-def
+;  V01 arg0         [V01,T02] (  3,  3   )     ref  ->  ebx         class-hnd single-def <System.__Canon>
+;  V02 arg1         [V02,T11] (  1,  1   )     ref  ->  [ebp+0x0C]  class-hnd single-def <System.__Canon>
+;  V03 TypeCtx      [V03,T00] (  5,  5   )     int  ->  esi         single-def
+;  V04 loc0         [V04,T03] (  2,  4   )     int  ->  [ebp-0x14]  spill-single-def "spilling helperCall"
+;  V05 loc1         [V05,T04] (  2,  4   )     int  ->  [ebp-0x18]  spill-single-def "spilling helperCall"
+;  V06 tmp2         [V06    ] (  2,  4   )  struct (32) [ebp-0x38]  do-not-enreg[HS] hidden-struct-arg "spilled call-like call argument" <System.Numerics.Vector`1[System.__Canon]>
+;  V07 tmp3         [V07    ] (  3,  6   )  struct (32) [ebp-0x58]  do-not-enreg[XS] addr-exposed ld-addr-op "NewObj constructor temp" <System.Numerics.Vector`1[System.__Canon]>
+;  V08 tmp4         [V08,T05] (  2,  4   )     int  ->  [ebp-0x5C]  spill-single-def "spilling helperCall"
+;  V09 tmp5         [V09    ] (  2,  4   )  struct (32) [ebp-0x7C]  do-not-enreg[HS] hidden-struct-arg "impAppendStmt" <System.Numerics.Vector`1[System.__Canon]>
+;  V10 tmp6         [V10,T06] (  2,  4   )     int  ->  edx         "spilling helperCall"
+;  V11 tmp7         [V11,T07] (  2,  4   )    long  ->  [ebp-0x38]  do-not-enreg[H] hidden-struct-arg "field V06._00 (fldOffset=0x0)" P-DEP
+;  V12 tmp8         [V12,T08] (  2,  4   )    long  ->  [ebp-0x30]  do-not-enreg[H] hidden-struct-arg "field V06._01 (fldOffset=0x8)" P-DEP
+;  V13 tmp9         [V13    ] (  3,  6   )    long  ->  [ebp-0x58]  do-not-enreg[X] addr-exposed "field V07._00 (fldOffset=0x0)" P-DEP
+;  V14 tmp10        [V14    ] (  3,  6   )    long  ->  [ebp-0x50]  do-not-enreg[X] addr-exposed "field V07._01 (fldOffset=0x8)" P-DEP
+;  V15 tmp11        [V15,T09] (  2,  4   )    long  ->  [ebp-0x7C]  do-not-enreg[H] hidden-struct-arg "field V09._00 (fldOffset=0x0)" P-DEP
+;  V16 tmp12        [V16,T10] (  2,  4   )    long  ->  [ebp-0x74]  do-not-enreg[H] hidden-struct-arg "field V09._01 (fldOffset=0x8)" P-DEP
 ;
-; Lcl frame size = 104
+; Lcl frame size = 112
 
 G_M12893_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
        push     ebp
@@ -36,72 +33,71 @@ G_M12893_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        push     edi
        push     esi
        push     ebx
-       sub      esp, 104
+       sub      esp, 112
        vzeroupper 
        mov      eax, dword ptr [ebp+0x08]
        mov      dword ptr [ebp-0x10], eax
-       mov      esi, ecx
-       ; byrRegs +[esi]
-       mov      edi, edx
-       ; gcrRegs +[edi]
-       mov      ecx, dword ptr [ebp+0x08]
+       mov      edi, ecx
+       ; byrRegs +[edi]
+       mov      ebx, edx
+       ; gcrRegs +[ebx]
+       mov      esi, dword ptr [ebp+0x08]
                       ;; size=25 bbWeight=1 PerfScore 10.00
-G_M12893_IG02:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       mov      edx, dword ptr [ecx+0x20]
-       mov      ebx, dword ptr [edx+0x08]
-       test     ebx, ebx
-       je       SHORT G_M12893_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M12893_IG03:        ; bbWeight=0.80, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       jmp      SHORT G_M12893_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M12893_IG04:        ; bbWeight=0.20, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref
+G_M12893_IG02:        ; bbWeight=1, gcrefRegs=00000008 {ebx}, byrefRegs=00000080 {edi}, byref
+       mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      ebx, eax
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M12893_IG05:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref
-       mov      edx, ebx
-       lea      ecx, [ebp-0x30]
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x14], eax
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x18], eax
+       lea      ecx, [ebp-0x38]
+       mov      edx, dword ptr [ebp-0x14]
        call     [System.Numerics.Vector`1[System.__Canon]:get_Indices():System.Numerics.Vector`1[System.__Canon]]
        vxorps   ymm0, ymm0, ymm0
-       vmovdqu  ymmword ptr [ebp-0x50], ymm0
-       mov      eax, ebx
-       mov      dword ptr [ebp-0x54], eax
+       vmovdqu  ymmword ptr [ebp-0x58], ymm0
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x5C], eax
        sub      esp, 32
-       vmovdqu  xmm0, xmmword ptr [ebp-0x30]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x38]
        vmovdqu  xmmword ptr [esp], xmm0
-       vmovdqu  xmm0, xmmword ptr [ebp-0x20]
+       vmovdqu  xmm0, xmmword ptr [ebp-0x28]
        vmovdqu  xmmword ptr [esp+0x10], xmm0
-       push     eax
-       lea      ecx, [ebp-0x74]
+       push     dword ptr [ebp-0x18]
+       lea      ecx, [ebp-0x7C]
        mov      edx, gword ptr [ebp+0x0C]
        ; gcrRegs +[edx]
        call     [System.Numerics.Vector`1[System.__Canon]:op_Multiply(System.Numerics.Vector`1[System.__Canon],System.__Canon):System.Numerics.Vector`1[System.__Canon]]
        ; gcrRegs -[edx]
-       push     dword ptr [ebp-0x54]
-       lea      ecx, [ebp-0x50]
-       mov      edx, edi
+       push     dword ptr [ebp-0x5C]
+       lea      ecx, [ebp-0x58]
+       mov      edx, ebx
        ; gcrRegs +[edx]
        call     [System.Numerics.Vector`1[System.__Canon]:.ctor(System.__Canon):this]
-       ; gcrRegs -[edx edi]
-       mov      edx, ebx
-       sub      esp, 32
-       vmovdqu  xmm0, xmmword ptr [ebp-0x74]
-       vmovdqu  xmmword ptr [esp], xmm0
-       vmovdqu  xmm0, xmmword ptr [ebp-0x64]
-       vmovdqu  xmmword ptr [esp+0x10], xmm0
-       sub      esp, 32
-       vmovdqu  xmm0, xmmword ptr [ebp-0x50]
-       vmovdqu  xmmword ptr [esp], xmm0
-       vmovdqu  xmm0, xmmword ptr [ebp-0x40]
-       vmovdqu  xmmword ptr [esp+0x10], xmm0
+       ; gcrRegs -[edx ebx]
        mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      edx, eax
+       sub      esp, 32
+       vmovdqu  xmm0, xmmword ptr [ebp-0x7C]
+       vmovdqu  xmmword ptr [esp], xmm0
+       vmovdqu  xmm0, xmmword ptr [ebp-0x6C]
+       vmovdqu  xmmword ptr [esp+0x10], xmm0
+       sub      esp, 32
+       vmovdqu  xmm0, xmmword ptr [ebp-0x58]
+       vmovdqu  xmmword ptr [esp], xmm0
+       vmovdqu  xmm0, xmmword ptr [ebp-0x48]
+       vmovdqu  xmmword ptr [esp+0x10], xmm0
+       mov      ecx, edi
        ; byrRegs +[ecx]
        call     [System.Numerics.Vector`1[System.__Canon]:op_Addition(System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon]]
-       ; byrRegs -[ecx esi]
-                       ;; size=134 bbWeight=1 PerfScore 50.83
-G_M12893_IG06:        ; bbWeight=1, epilog, nogc, extend
+       ; byrRegs -[ecx edi]
+                       ;; size=189 bbWeight=1 PerfScore 59.33
+G_M12893_IG03:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -110,6 +106,6 @@ G_M12893_IG06:        ; bbWeight=1, epilog, nogc, extend
        ret      8
                        ;; size=10 bbWeight=1 PerfScore 4.50
 
-; Total bytes of code 193, prolog size 18, PerfScore 72.48, instruction count 59, allocated bytes for code 193 (MethodHash=fae6cda2) for method System.Numerics.Vector:CreateSequence[System.__Canon](System.__Canon,System.__Canon):System.Numerics.Vector`1[System.__Canon] (FullOpts)
+; Total bytes of code 224, prolog size 18, PerfScore 73.83, instruction count 64, allocated bytes for code 224 (MethodHash=fae6cda2) for method System.Numerics.Vector:CreateSequence[System.__Canon](System.__Canon,System.__Canon):System.Numerics.Vector`1[System.__Canon] (FullOpts)
 ; ============================================================

libraries_tests.run.windows.x86.Release.mch

-26 (-38.81%) : 11613.dasm - System.Linq.Enumerable:EmptySystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -17,36 +17,21 @@ G_M41558_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      dword ptr [ebp-0x04], ecx
        mov      dword ptr [ebp-0x08], ecx
                        ;; size=12 bbWeight=1 PerfScore 3.50
-G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x08], 0
-       je       SHORT G_M41558_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M41558_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x08]
-       mov      dword ptr [ebp-0x0C], eax
-       jmp      SHORT G_M41558_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M41558_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x08]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x0C], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M41558_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x0C]
        call     [<unknown method>]
        ; gcrRegs +[eax]
-                      ;; size=9 bbWeight=1 PerfScore 4.00
-G_M41558_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=25 bbWeight=1 PerfScore 7.25
+G_M41558_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 67, prolog size 9, PerfScore 23.30, instruction count 23, allocated bytes for code 67 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (Instrumented Tier0)
+; Total bytes of code 41, prolog size 9, PerfScore 12.50, instruction count 14, allocated bytes for code 41 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (Instrumented Tier0)
 ; ============================================================

-26 (-38.81%) : 6678.dasm - System.Linq.Enumerable:EmptySystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -17,36 +17,21 @@ G_M41558_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      dword ptr [ebp-0x04], ecx
        mov      dword ptr [ebp-0x08], ecx
                        ;; size=12 bbWeight=1 PerfScore 3.50
-G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x08], 0
-       je       SHORT G_M41558_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M41558_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x08]
-       mov      dword ptr [ebp-0x0C], eax
-       jmp      SHORT G_M41558_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M41558_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x08]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x0C], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M41558_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x0C]
        call     [<unknown method>]
        ; gcrRegs +[eax]
-                      ;; size=9 bbWeight=1 PerfScore 4.00
-G_M41558_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=25 bbWeight=1 PerfScore 7.25
+G_M41558_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 67, prolog size 9, PerfScore 23.30, instruction count 23, allocated bytes for code 67 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
+; Total bytes of code 41, prolog size 9, PerfScore 12.50, instruction count 14, allocated bytes for code 41 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
 ; ============================================================

-26 (-38.81%) : 2383.dasm - System.Linq.Enumerable:EmptySystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -17,36 +17,21 @@ G_M41558_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      dword ptr [ebp-0x04], ecx
        mov      dword ptr [ebp-0x08], ecx
                        ;; size=12 bbWeight=1 PerfScore 3.50
-G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       cmp      dword ptr [eax+0x08], 0
-       je       SHORT G_M41558_IG04
-                       ;; size=12 bbWeight=1 PerfScore 7.00
-G_M41558_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      eax, dword ptr [ebp-0x08]
-       mov      eax, dword ptr [eax+0x20]
-       mov      eax, dword ptr [eax+0x08]
-       mov      dword ptr [ebp-0x0C], eax
-       jmp      SHORT G_M41558_IG05
-                       ;; size=14 bbWeight=0.80 PerfScore 6.40
-G_M41558_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x08]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x0C], eax
-                       ;; size=16 bbWeight=0.20 PerfScore 0.65
-G_M41558_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x0C]
        call     [<unknown method>]
        ; gcrRegs +[eax]
-                      ;; size=9 bbWeight=1 PerfScore 4.00
-G_M41558_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=25 bbWeight=1 PerfScore 7.25
+G_M41558_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 67, prolog size 9, PerfScore 23.30, instruction count 23, allocated bytes for code 67 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
+; Total bytes of code 41, prolog size 9, PerfScore 12.50, instruction count 14, allocated bytes for code 41 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
 ; ============================================================

+6 (+2.84%) : 3549.dasm - System.Linq.Enumerable:gEnumerableToArray|296_0System.__Canon:System.Canon 

@@ -8,12 +8,12 @@
 ; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 arg0         [V00,T05] (  3,  3   )     ref  ->  [ebp-0xC4]  class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
-;  V01 TypeCtx      [V01,T00] (  7,  5.56)     int  ->  ebx         single-def
+;  V00 arg0         [V00,T03] (  3,  3   )     ref  ->  [ebp-0xC4]  class-hnd single-def <System.Collections.Generic.IEnumerable`1[System.__Canon]>
+;  V01 TypeCtx      [V01,T00] (  8,  8   )     int  ->  ebx         single-def
 ;  V02 loc0         [V02    ] (  1,  1   )  struct (32) [ebp-0x30]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon]>
 ;  V03 loc1         [V03    ] (  5,  5   )  struct (136) [ebp-0xB8]  do-not-enreg[XSF] must-init addr-exposed ld-addr-op <System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]>
-;  V04 loc2         [V04,T12] (  2,  2   )     ref  ->  edi         class-hnd single-def <System.__Canon[]>
-;* V05 loc3         [V05    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V04 loc2         [V04,T07] (  2,  2   )     ref  ->  esi         class-hnd single-def <System.__Canon[]>
+;  V05 loc3         [V05,T04] (  2,  4   )     int  ->  edi         "spilling helperCall"
 ;* V06 tmp1         [V06    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V07 tmp2         [V07    ] (  3,  6   )  struct ( 8) [ebp-0xC0]  do-not-enreg[HS] must-init hidden-struct-arg "spilled call-like call argument" <System.Span`1[System.__Canon]>
 ;* V08 tmp3         [V08    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
@@ -24,14 +24,8 @@
 ;  V13 tmp8         [V13,T02] (  3,  6   )     int  ->  [ebp-0xBC]  do-not-enreg[H] hidden-struct-arg "field V07._length (fldOffset=0x4)" P-DEP
 ;* V14 tmp9         [V14    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
 ;* V15 tmp10        [V15    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x4)" P-INDEP
-;  V16 tmp11        [V16,T10] (  2,  4   )     int  ->  edx         "argument with side effect"
-;  V17 tmp12        [V17,T11] (  2,  4   )     int  ->  edx         "argument with side effect"
-;  V18 cse0         [V18,T07] (  4,  4   )     int  ->  esi         "CSE - aggressive"
-;  V19 rat0         [V19,T08] (  3,  4   )     int  ->  eax         "runtime lookup"
-;  V20 rat1         [V20,T03] (  3,  5.60)     int  ->  eax         "fgMakeTemp is creating a new local variable"
-;  V21 rat2         [V21,T09] (  3,  4   )     int  ->  esi         "runtime lookup"
-;  V22 rat3         [V22,T04] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V23 rat4         [V23,T06] (  3,  4.48)     int  ->  esi         "fgMakeTemp is creating a new local variable"
+;  V16 tmp11        [V16,T05] (  2,  4   )     int  ->  edx         "argument with side effect"
+;  V17 tmp12        [V17,T06] (  2,  4   )     int  ->  edx         "argument with side effect"
 ;
 ; Lcl frame size = 184
 
@@ -53,25 +47,18 @@ G_M19942_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; GC ptr vars +{V00}
        mov      ebx, edx
                        ;; size=56 bbWeight=1 PerfScore 17.08
-G_M19942_IG02:        ; bbWeight=1, gcVars=00000020 {V00}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
-       mov      ecx, dword ptr [ebx+0x20]
-       mov      eax, dword ptr [ecx+0x08]
-       test     eax, eax
-       je       SHORT G_M19942_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M19942_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M19942_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M19942_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M19942_IG02:        ; bbWeight=1, gcVars=00000008 {V00}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M19942_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
+       call     CORINFO_HELP_MEMCPY
+       mov      edi, eax
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
        push     8
-       push     eax
-       lea      edx, [ebp-0x30]
+       push     edi
        lea      ecx, [ebp-0xC0]
+       lea      edx, [ebp-0x30]
        call     [<PrivateImplementationDetails>:InlineArrayAsSpan[System.Collections.Generic.SegmentedArrayBuilder`1+ScratchBuffer[System.__Canon],System.__Canon](byref,int):System.Span`1[System.__Canon]]
        lea      edi, bword ptr [ebp-0x40]
        ; byrRegs +[edi]
@@ -83,47 +70,37 @@ G_M19942_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        lea      esi, bword ptr [ebp-0xC0]
        movsd    
        movsd    
-       mov      ecx, dword ptr [ebx+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M19942_IG08
-                       ;; size=49 bbWeight=1 PerfScore 18.00
-G_M19942_IG06:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       ; byrRegs -[esi edi]
-       mov      esi, dword ptr [ecx+0x0C]
-       test     esi, esi
-       je       SHORT G_M19942_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M19942_IG07:        ; bbWeight=0.64, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M19942_IG09
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M19942_IG08:        ; bbWeight=0.36, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      esi, eax
-                       ;; size=14 bbWeight=0.36 PerfScore 0.63
-G_M19942_IG09:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       push     esi
+       call     CORINFO_HELP_MEMCPY
+       ; byrRegs -[esi edi]
+       push     eax
        lea      ecx, [ebp-0xB8]
        mov      edx, gword ptr [ebp-0xC4]
        ; gcrRegs +[edx]
        ; GC ptr vars -{V00}
        call     [<unknown method>]
        ; gcrRegs -[edx]
-       mov      edx, esi
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      edx, eax
        lea      ecx, [ebp-0xB8]
        call     [System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:ToArray():System.__Canon[]:this]
        ; gcrRegs +[eax]
-       mov      edi, eax
-       ; gcrRegs +[edi]
-       mov      edx, esi
+       mov      esi, eax
+       ; gcrRegs +[esi]
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
+       mov      edx, eax
        lea      ecx, [ebp-0xB8]
        call     [System.Collections.Generic.SegmentedArrayBuilder`1[System.__Canon]:Dispose():this]
-       ; gcrRegs -[eax]
-       mov      eax, edi
+       mov      eax, esi
        ; gcrRegs +[eax]
-                        ;; size=51 bbWeight=1 PerfScore 13.50
-G_M19942_IG10:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=153 bbWeight=1 PerfScore 33.25
+G_M19942_IG03:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -132,6 +109,6 @@ G_M19942_IG10:        ; bbWeight=1, epilog, nogc, extend
        ret      
                        ;; size=8 bbWeight=1 PerfScore 3.50
 
-; Total bytes of code 211, prolog size 48, PerfScore 63.74, instruction count 65, allocated bytes for code 211 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
+; Total bytes of code 217, prolog size 48, PerfScore 53.83, instruction count 62, allocated bytes for code 217 (MethodHash=008eb219) for method System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
 ; ============================================================

+11 (+5.24%) : 8479.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1) 

@@ -5,22 +5,23 @@
 ; optimized using Dynamic PGO
 ; ebp based frame
 ; partially interruptible
-; with Dynamic PGO: edge weights are invalid, and fgCalledCount is 8
+; with Dynamic PGO: edge weights are valid, and fgCalledCount is 8
 ; 2 inlinees with PGO data; 3 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  5,  3.25)     ref  ->  edi         this class-hnd single-def <System.Collections.Hashtable>
 ;  V01 arg1         [V01,T00] ( 13,  5.06)     ref  ->  esi         class-hnd single-def <System.Object>
 ;  V02 arg2         [V02,T02] (  5,  2.25)     ref  ->  ebx         class-hnd single-def <System.Object>
-;  V03 tmp0         [V03,T06] (  4,  0.42)     int  ->  eax         "guarded devirt return temp"
+;  V03 tmp0         [V03,T08] (  4,  0.38)     int  ->  eax         "guarded devirt return temp"
 ;* V04 tmp1         [V04    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def "guarded devirt this exact temp" <System.String>
 ;* V05 tmp2         [V05    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V06 tmp3         [V06    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;* V07 tmp4         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling QMark2" <System.String>
-;  V08 tmp5         [V08,T03] (  6,  1.02)     ref  ->  ebx         class-hnd exact "Inline stloc first use temp" <System.String>
-;  V09 tmp6         [V09,T05] (  2,  0.51)   byref  ->  ecx         single-def "impAppendStmt"
-;  V10 tmp7         [V10,T04] (  3,  1   )     int  ->  ebx         "Single return block return value"
-;  V11 tmp8         [V11,T07] (  2,  0   )     ref  ->  ecx         single-def "argument with side effect"
+;  V07 tmp4         [V07,T05] (  5,  0.93)     ref  ->  ebx         class-hnd exact single-def "Inline stloc first use temp" <System.String>
+;  V08 tmp5         [V08,T06] (  2,  0.51)   byref  ->  ecx         single-def "impAppendStmt"
+;  V09 tmp6         [V09,T04] (  3,  1   )     int  ->  ebx         "Single return block return value"
+;  V10 tmp7         [V10,T09] (  2,  0   )     ref  ->  ecx         single-def "argument with side effect"
+;  V11 rat0         [V11,T03] (  5,  1.88)     ref  ->  ebx         "replacement local"
+;  V12 rat1         [V12,T07] (  2,  0.50)     int  ->  ecx         "CSE for expectedClsNode"
 ;
 ; Lcl frame size = 0
 
@@ -49,7 +50,7 @@ G_M51920_IG02:        ; bbWeight=1, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=
                        ;; size=20 bbWeight=1 PerfScore 4.75
 G_M51920_IG03:        ; bbWeight=1, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
        cmp      gword ptr [edi+0x04], esi
-       je       G_M51920_IG14
+       je       G_M51920_IG18
        cmp      esi, ebx
        jne      SHORT G_M51920_IG06
                        ;; size=13 bbWeight=1 PerfScore 5.25
@@ -67,25 +68,35 @@ G_M51920_IG05:        ; bbWeight=0.75, epilog, nogc, extend
 G_M51920_IG06:        ; bbWeight=0.25, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs +[ebx esi edi]
        cmp      gword ptr [edi+0x10], 0
-       jne      SHORT G_M51920_IG16
+       jne      SHORT G_M51920_IG15
        test     esi, esi
-       je       SHORT G_M51920_IG14
+       je       G_M51920_IG18
        cmp      dword ptr [esi], 0xD1FFAB1E
        jne      SHORT G_M51920_IG17
        test     ebx, ebx
-       je       SHORT G_M51920_IG13
-                       ;; size=22 bbWeight=0.25 PerfScore 2.62
-G_M51920_IG07:        ; bbWeight=0.09, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       je       SHORT G_M51920_IG09
+                       ;; size=26 bbWeight=0.25 PerfScore 2.62
+G_M51920_IG07:        ; bbWeight=0.12, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs -[edi]
-       cmp      dword ptr [ebx], 0xD1FFAB1E
-       jne      SHORT G_M51920_IG13
-                       ;; size=8 bbWeight=0.09 PerfScore 0.35
-G_M51920_IG08:        ; bbWeight=0.17, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       mov      ecx, 0xD1FFAB1E      ; System.String
+       cmp      dword ptr [ebx], ecx
+       je       SHORT G_M51920_IG09
+                       ;; size=9 bbWeight=0.12 PerfScore 0.53
+G_M51920_IG08:        ; bbWeight=0.06, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[ebx]
+       xor      ebx, ebx
+       ; gcrRegs +[ebx]
+                       ;; size=2 bbWeight=0.06 PerfScore 0.02
+G_M51920_IG09:        ; bbWeight=0.25, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       test     ebx, ebx
+       je       SHORT G_M51920_IG16
+                       ;; size=4 bbWeight=0.25 PerfScore 0.31
+G_M51920_IG10:        ; bbWeight=0.17, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
        mov      ecx, dword ptr [esi+0x04]
        cmp      ecx, dword ptr [ebx+0x04]
-       jne      SHORT G_M51920_IG13
+       jne      SHORT G_M51920_IG16
                         ;; size=8 bbWeight=0.17 PerfScore 1.05
-G_M51920_IG09:        ; bbWeight=0.13, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
+G_M51920_IG11:        ; bbWeight=0.13, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      ecx, 1
        call     [System.Diagnostics.Debug:Assert(ubyte)]
        mov      ecx, 1
@@ -106,34 +117,20 @@ G_M51920_IG09:        ; bbWeight=0.13, gcrefRegs=00000048 {ebx esi}, byrefRegs=0
        ; gcrRegs -[ebx esi]
        ; byrRegs -[ecx edx]
                        ;; size=58 bbWeight=0.13 PerfScore 2.95
-G_M51920_IG10:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M51920_IG12:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        movzx    ebx, al
                        ;; size=3 bbWeight=0.25 PerfScore 0.06
-G_M51920_IG11:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M51920_IG13:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        movzx    eax, bl
                        ;; size=3 bbWeight=0.25 PerfScore 0.06
-G_M51920_IG12:        ; bbWeight=0.25, epilog, nogc, extend
+G_M51920_IG14:        ; bbWeight=0.25, epilog, nogc, extend
        pop      ebx
        pop      esi
        pop      edi
        pop      ebp
        ret      4
                        ;; size=7 bbWeight=0.25 PerfScore 1.00
-G_M51920_IG13:        ; bbWeight=0.04, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
-       xor      eax, eax
-       jmp      SHORT G_M51920_IG10
-                       ;; size=4 bbWeight=0.04 PerfScore 0.10
-G_M51920_IG14:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       xor      eax, eax
-                       ;; size=2 bbWeight=0 PerfScore 0.00
-G_M51920_IG15:        ; bbWeight=0, epilog, nogc, extend
-       pop      ebx
-       pop      esi
-       pop      edi
-       pop      ebp
-       ret      4
-                       ;; size=7 bbWeight=0 PerfScore 0.00
-G_M51920_IG16:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M51920_IG15:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs +[ebx esi edi]
        mov      ecx, gword ptr [edi+0x10]
        ; gcrRegs +[ecx]
@@ -143,8 +140,12 @@ G_M51920_IG16:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx
        call     [<unknown method>]
        ; gcrRegs -[ecx edx ebx esi edi]
        mov      ebx, eax
-       jmp      SHORT G_M51920_IG11
+       jmp      SHORT G_M51920_IG13
                      ;; size=16 bbWeight=0 PerfScore 0.00
+G_M51920_IG16:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
+       xor      eax, eax
+       jmp      SHORT G_M51920_IG12
+                       ;; size=4 bbWeight=0 PerfScore 0.00
 G_M51920_IG17:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
        ; gcrRegs +[ebx esi]
        mov      ecx, esi
@@ -155,9 +156,19 @@ G_M51920_IG17:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=0000
        mov      eax, dword ptr [eax+0x2C]
        call     [eax+0x08]<unknown method>
        ; gcrRegs -[ecx edx ebx esi]
-       jmp      SHORT G_M51920_IG10
+       jmp      SHORT G_M51920_IG12
                       ;; size=14 bbWeight=0 PerfScore 0.00
+G_M51920_IG18:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+       xor      eax, eax
+                       ;; size=2 bbWeight=0 PerfScore 0.00
+G_M51920_IG19:        ; bbWeight=0, epilog, nogc, extend
+       pop      ebx
+       pop      esi
+       pop      edi
+       pop      ebp
+       ret      4
+                       ;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 210, prolog size 6, PerfScore 27.13, instruction count 78, allocated bytes for code 210 (MethodHash=350c352f) for method System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
+; Total bytes of code 221, prolog size 6, PerfScore 27.54, instruction count 82, allocated bytes for code 221 (MethodHash=350c352f) for method System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
 ; ============================================================

+17 (+7.94%) : 3931.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1) 

@@ -12,15 +12,16 @@
 ;  V00 this         [V00,T01] (  5,  3.25)     ref  ->  edi         this class-hnd single-def <System.Collections.Hashtable>
 ;  V01 arg1         [V01,T00] ( 13,  4.87)     ref  ->  esi         class-hnd single-def <System.Object>
 ;  V02 arg2         [V02,T02] (  5,  2.25)     ref  ->  ebx         class-hnd single-def <System.Object>
-;  V03 tmp0         [V03,T06] (  4,  0.34)     int  ->  eax         "guarded devirt return temp"
+;  V03 tmp0         [V03,T08] (  4,  0.34)     int  ->  eax         "guarded devirt return temp"
 ;* V04 tmp1         [V04    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def "guarded devirt this exact temp" <System.String>
 ;* V05 tmp2         [V05    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;* V06 tmp3         [V06    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
-;* V07 tmp4         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling QMark2" <System.String>
-;  V08 tmp5         [V08,T04] (  6,  0.85)     ref  ->  ebx         class-hnd exact "Inline stloc first use temp" <System.String>
-;  V09 tmp6         [V09,T05] (  2,  0.34)   byref  ->  ecx         single-def "impAppendStmt"
-;  V10 tmp7         [V10,T03] (  3,  1   )     int  ->  ebx         "Single return block return value"
-;  V11 tmp8         [V11,T07] (  2,  0   )     ref  ->  ecx         single-def "argument with side effect"
+;  V07 tmp4         [V07,T05] (  5,  0.79)     ref  ->  ebx         class-hnd exact single-def "Inline stloc first use temp" <System.String>
+;  V08 tmp5         [V08,T07] (  2,  0.34)   byref  ->  ecx         single-def "impAppendStmt"
+;  V09 tmp6         [V09,T04] (  3,  1   )     int  ->  ebx         "Single return block return value"
+;  V10 tmp7         [V10,T09] (  2,  0   )     ref  ->  ecx         single-def "argument with side effect"
+;  V11 rat0         [V11,T03] (  5,  1.88)     ref  ->  ebx         "replacement local"
+;  V12 rat1         [V12,T06] (  2,  0.50)     int  ->  ecx         "CSE for expectedClsNode"
 ;
 ; Lcl frame size = 0
 
@@ -49,7 +50,7 @@ G_M51920_IG02:        ; bbWeight=1, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=
                        ;; size=20 bbWeight=1 PerfScore 4.75
 G_M51920_IG03:        ; bbWeight=1, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
        cmp      gword ptr [edi+0x04], esi
-       je       G_M51920_IG15
+       je       G_M51920_IG16
        cmp      esi, ebx
        jne      SHORT G_M51920_IG06
                        ;; size=13 bbWeight=1 PerfScore 5.25
@@ -67,30 +68,25 @@ G_M51920_IG05:        ; bbWeight=0.75, epilog, nogc, extend
 G_M51920_IG06:        ; bbWeight=0.25, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs +[ebx esi edi]
        cmp      gword ptr [edi+0x10], 0
-       jne      G_M51920_IG17
+       jne      G_M51920_IG18
        test     esi, esi
-       je       SHORT G_M51920_IG15
+       je       G_M51920_IG16
        cmp      dword ptr [esi], 0xD1FFAB1E
-       jne      SHORT G_M51920_IG14
+       jne      SHORT G_M51920_IG15
        test     ebx, ebx
-       jne      SHORT G_M51920_IG08
-                       ;; size=26 bbWeight=0.25 PerfScore 2.62
-G_M51920_IG07:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs -[ebx esi edi]
-       xor      eax, eax
-       jmp      SHORT G_M51920_IG11
-                       ;; size=4 bbWeight=0 PerfScore 0.00
-G_M51920_IG08:        ; bbWeight=0.06, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs +[ebx esi]
-       cmp      dword ptr [ebx], 0xD1FFAB1E
-       jne      SHORT G_M51920_IG07
-                       ;; size=8 bbWeight=0.06 PerfScore 0.23
-G_M51920_IG09:        ; bbWeight=0.12, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       jne      SHORT G_M51920_IG13
+                       ;; size=30 bbWeight=0.25 PerfScore 2.62
+G_M51920_IG07:        ; bbWeight=0.25, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
+       ; gcrRegs -[edi]
+       test     ebx, ebx
+       je       G_M51920_IG19
+                       ;; size=8 bbWeight=0.25 PerfScore 0.31
+G_M51920_IG08:        ; bbWeight=0.12, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
        mov      ecx, dword ptr [esi+0x04]
        cmp      ecx, dword ptr [ebx+0x04]
-       jne      SHORT G_M51920_IG07
+       jne      SHORT G_M51920_IG19
                         ;; size=8 bbWeight=0.12 PerfScore 0.70
-G_M51920_IG10:        ; bbWeight=0.09, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
+G_M51920_IG09:        ; bbWeight=0.09, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
        mov      ecx, 1
        call     [System.Diagnostics.Debug:Assert(ubyte)]
        mov      ecx, 1
@@ -111,21 +107,32 @@ G_M51920_IG10:        ; bbWeight=0.09, gcrefRegs=00000048 {ebx esi}, byrefRegs=0
        ; gcrRegs -[ebx esi]
        ; byrRegs -[ecx edx]
                        ;; size=58 bbWeight=0.09 PerfScore 1.96
-G_M51920_IG11:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M51920_IG10:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        movzx    ebx, al
                        ;; size=3 bbWeight=0.25 PerfScore 0.06
-G_M51920_IG12:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M51920_IG11:        ; bbWeight=0.25, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        movzx    eax, bl
                        ;; size=3 bbWeight=0.25 PerfScore 0.06
-G_M51920_IG13:        ; bbWeight=0.25, epilog, nogc, extend
+G_M51920_IG12:        ; bbWeight=0.25, epilog, nogc, extend
        pop      ebx
        pop      esi
        pop      edi
        pop      ebp
        ret      4
                        ;; size=7 bbWeight=0.25 PerfScore 1.00
-G_M51920_IG14:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M51920_IG13:        ; bbWeight=0.12, gcVars=00000000 {}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs +[ebx esi]
+       mov      ecx, 0xD1FFAB1E      ; System.String
+       cmp      dword ptr [ebx], ecx
+       je       SHORT G_M51920_IG07
+                       ;; size=9 bbWeight=0.12 PerfScore 0.53
+G_M51920_IG14:        ; bbWeight=0.06, gcrefRegs=00000040 {esi}, byrefRegs=00000000 {}, byref, isz
+       ; gcrRegs -[ebx]
+       xor      ebx, ebx
+       ; gcrRegs +[ebx]
+       jmp      SHORT G_M51920_IG07
+                       ;; size=4 bbWeight=0.06 PerfScore 0.14
+G_M51920_IG15:        ; bbWeight=0, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
        mov      ecx, esi
        ; gcrRegs +[ecx]
        mov      edx, ebx
@@ -134,19 +141,19 @@ G_M51920_IG14:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000048 {ebx
        mov      eax, dword ptr [eax+0x2C]
        call     [eax+0x08]<unknown method>
        ; gcrRegs -[ecx edx ebx esi]
-       jmp      SHORT G_M51920_IG11
+       jmp      SHORT G_M51920_IG10
                       ;; size=14 bbWeight=0 PerfScore 0.00
-G_M51920_IG15:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M51920_IG16:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        xor      eax, eax
                        ;; size=2 bbWeight=0 PerfScore 0.00
-G_M51920_IG16:        ; bbWeight=0, epilog, nogc, extend
+G_M51920_IG17:        ; bbWeight=0, epilog, nogc, extend
        pop      ebx
        pop      esi
        pop      edi
        pop      ebp
        ret      4
                        ;; size=7 bbWeight=0 PerfScore 0.00
-G_M51920_IG17:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
+G_M51920_IG18:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs +[ebx esi edi]
        mov      ecx, gword ptr [edi+0x10]
        ; gcrRegs +[ecx]
@@ -156,9 +163,13 @@ G_M51920_IG17:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=000000C8 {ebx
        call     [<unknown method>]
        ; gcrRegs -[ecx edx ebx esi edi]
        mov      ebx, eax
-       jmp      SHORT G_M51920_IG12
+       jmp      SHORT G_M51920_IG11
                      ;; size=16 bbWeight=0 PerfScore 0.00
+G_M51920_IG19:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
+       xor      eax, eax
+       jmp      SHORT G_M51920_IG10
+                       ;; size=4 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 214, prolog size 6, PerfScore 25.59, instruction count 78, allocated bytes for code 214 (MethodHash=350c352f) for method System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
+; Total bytes of code 231, prolog size 6, PerfScore 26.34, instruction count 83, allocated bytes for code 231 (MethodHash=350c352f) for method System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
 ; ============================================================

librariestestsnotieredcompilation.run.windows.x86.Release.mch

-14 (-32.56%) : 3256.dasm - System.Linq.Enumerable:EmptySystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -7,10 +7,8 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->  ecx         single-def
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->  ecx         single-def
 ;* V01 loc0         [V01    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V02 rat0         [V02,T02] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V03 rat1         [V03,T01] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 4
 
@@ -20,31 +18,19 @@ G_M41558_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        push     eax
        mov      dword ptr [ebp-0x04], ecx
                        ;; size=7 bbWeight=1 PerfScore 3.25
-G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, dword ptr [ecx+0x20]
-       mov      edx, dword ptr [edx+0x08]
-       test     edx, edx
-       je       SHORT G_M41558_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M41558_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M41558_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M41558_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M41558_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edx, eax
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M41558_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       mov      ecx, edx
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, eax
        call     [System.Array:Empty[System.__Canon]():System.__Canon[]]
        ; gcrRegs +[eax]
-                      ;; size=8 bbWeight=1 PerfScore 3.25
-G_M41558_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=18 bbWeight=1 PerfScore 4.50
+G_M41558_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 43, prolog size 7, PerfScore 15.40, instruction count 17, allocated bytes for code 43 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
+; Total bytes of code 29, prolog size 7, PerfScore 9.50, instruction count 11, allocated bytes for code 29 (MethodHash=4b205da9) for method System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
 ; ============================================================

-42 (-32.06%) : 5298.dasm - Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxListPool:ToListAndFreeSystem.__Canon:Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (FullOpts) 

@@ -7,16 +7,13 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T03] (  3,  3   )     ref  ->  edi         this class-hnd single-def <Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxListPool>
+;  V00 this         [V00,T01] (  3,  3   )     ref  ->  edi         this class-hnd single-def <Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxListPool>
 ;  V01 arg1         [V01,T00] (  4,  4   )   byref  ->  esi         single-def
-;  V02 TypeCtx      [V02,T07] (  5,  3.56)     int  ->  ebx         single-def
-;  V03 loc0         [V03,T05] (  3,  4   )     int  ->  [ebp-0x14]  "spilling helperCall"
-;  V04 tmp1         [V04,T06] (  3,  4   )     int  ->  ebx         "spilling helperCall"
+;  V02 TypeCtx      [V02,T04] (  3,  3   )     int  ->  ebx         single-def
+;  V03 loc0         [V03,T02] (  2,  4   )     int  ->  [ebp-0x14]  spill-single-def "spilling helperCall"
+;  V04 tmp1         [V04,T03] (  2,  4   )     int  ->  ebx         "spilling helperCall"
 ;* V05 tmp2         [V05    ] (  0,  0   )  struct ( 4) zero-ref    single-def "impAppendStmt" <Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]>
-;  V06 tmp3         [V06,T08] (  2,  2   )     ref  ->  [ebp-0x18]  spill-single-def "field V05._list (fldOffset=0x0)" P-INDEP
-;  V07 rat0         [V07,T01] (  3,  5.60)     int  ->  eax         "fgMakeTemp is creating a new local variable"
-;  V08 rat1         [V08,T02] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V09 rat2         [V09,T04] (  3,  4.48)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V06 tmp3         [V06,T05] (  2,  2   )     ref  ->  [ebp-0x18]  spill-single-def "field V05._list (fldOffset=0x0)" P-INDEP
 ;
 ; Lcl frame size = 12
 
@@ -35,53 +32,18 @@ G_M15751_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; byrRegs +[esi]
        mov      ebx, dword ptr [ebp+0x08]
                        ;; size=22 bbWeight=1 PerfScore 9.00
-G_M15751_IG02:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       mov      ecx, dword ptr [ebx+0x20]
-       mov      eax, dword ptr [ecx+0x08]
-       test     eax, eax
-       je       SHORT G_M15751_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M15751_IG03:        ; bbWeight=0.80, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       jmp      SHORT G_M15751_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M15751_IG04:        ; bbWeight=0.20, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref
+G_M15751_IG02:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      dword ptr [ebp-0x14], eax
-                       ;; size=15 bbWeight=0.20 PerfScore 0.50
-G_M15751_IG05:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       mov      ecx, dword ptr [ebx+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M15751_IG09
-                       ;; size=9 bbWeight=1 PerfScore 6.00
-G_M15751_IG06:        ; bbWeight=0.80, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       mov      edx, dword ptr [ecx+0x0C]
-       test     edx, edx
-       je       SHORT G_M15751_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M15751_IG07:        ; bbWeight=0.64, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       mov      ebx, edx
-       jmp      SHORT G_M15751_IG11
-                       ;; size=4 bbWeight=0.64 PerfScore 1.44
-G_M15751_IG08:        ; bbWeight=0.40, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref, isz
-       mov      dword ptr [ebp-0x14], eax
-       jmp      SHORT G_M15751_IG10
-                       ;; size=5 bbWeight=0.40 PerfScore 1.20
-G_M15751_IG09:        ; bbWeight=0.50, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref
-       mov      dword ptr [ebp-0x14], eax
-                       ;; size=3 bbWeight=0.50 PerfScore 0.50
-G_M15751_IG10:        ; bbWeight=0.36, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      ebx, eax
-       mov      eax, dword ptr [ebp-0x14]
-                       ;; size=17 bbWeight=0.36 PerfScore 0.99
-G_M15751_IG11:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000040 {esi}, byref
        mov      ecx, esi
        ; byrRegs +[ecx]
-       mov      edx, eax
+       mov      edx, dword ptr [ebp-0x14]
        call     [Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxListBuilder`1[System.__Canon]:ToList():Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this]
        ; gcrRegs +[eax]
        ; byrRegs -[ecx]
@@ -97,8 +59,8 @@ G_M15751_IG11:        ; bbWeight=1, gcrefRegs=00000080 {edi}, byrefRegs=00000040
        ; byrRegs -[edx esi]
        mov      eax, gword ptr [ebp-0x18]
        ; gcrRegs +[eax]
-                      ;; size=27 bbWeight=1 PerfScore 10.00
-G_M15751_IG12:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=57 bbWeight=1 PerfScore 15.00
+G_M15751_IG03:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -107,6 +69,6 @@ G_M15751_IG12:        ; bbWeight=1, epilog, nogc, extend
        ret      4
                        ;; size=10 bbWeight=1 PerfScore 4.50
 
-; Total bytes of code 131, prolog size 15, PerfScore 43.58, instruction count 51, allocated bytes for code 131 (MethodHash=a516c278) for method Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxListPool:ToListAndFree[System.__Canon](byref):Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (FullOpts)
+; Total bytes of code 89, prolog size 15, PerfScore 28.50, instruction count 34, allocated bytes for code 89 (MethodHash=a516c278) for method Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxListPool:ToListAndFree[System.__Canon](byref):Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (FullOpts)
 ; ============================================================

-30 (-30.30%) : 3364.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilderSystem.ValueTuple3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray1+Builder[System.ValueTuple`3[int,int,System.__Canon] 

@@ -7,17 +7,12 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->  esi         single-def
+;  V00 TypeCtx      [V00,T00] (  5,  5   )     int  ->  esi         single-def
 ;  V01 loc0         [V01    ] (  2,  2   )  struct ( 4) [ebp-0x0C]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Immutable.ImmutableArray`1[System.ValueTuple`3[int,int,System.__Canon]]>
 ;* V02 loc1         [V02    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V03 tmp1         [V03    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V04 tmp2         [V04    ] (  2,  2   )     ref  ->  [ebp-0x0C]  do-not-enreg[X] addr-exposed "field V01.array (fldOffset=0x0)" P-DEP
-;  V05 tmp3         [V05,T06] (  2,  4   )     int  ->  edx         "argument with side effect"
-;  V06 rat0         [V06,T04] (  3,  4   )     int  ->  ecx         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->  ecx         "fgMakeTemp is creating a new local variable"
-;  V08 rat2         [V08,T05] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V09 rat3         [V09,T02] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V10 rat4         [V10,T03] (  3,  4.48)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V05 tmp3         [V05,T01] (  2,  4   )     int  ->  edx         "argument with side effect"
 ;
 ; Lcl frame size = 8
 
@@ -31,56 +26,30 @@ G_M7461_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {},
        mov      dword ptr [ebp-0x08], ecx
        mov      esi, ecx
                        ;; size=17 bbWeight=1 PerfScore 5.00
-G_M7461_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       mov      ecx, dword ptr [ecx+0x08]
-       test     ecx, ecx
-       je       SHORT G_M7461_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M7461_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M7461_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M7461_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M7461_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      ecx, eax
-                        ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M7461_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
        call     [System.Collections.Immutable.ImmutableArray:Create[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1[System.ValueTuple`3[int,int,System.__Canon]]]
        ; gcrRegs +[eax]
        mov      gword ptr [ebp-0x0C], eax
-       mov      ecx, dword ptr [esi+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M7461_IG08
-                       ;; size=18 bbWeight=1 PerfScore 10.00
-G_M7461_IG06:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs -[eax]
-       mov      edx, dword ptr [ecx+0x0C]
-       test     edx, edx
-       je       SHORT G_M7461_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M7461_IG07:        ; bbWeight=0.64, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M7461_IG09
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M7461_IG08:        ; bbWeight=0.36, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
        mov      edx, eax
-                      ;; size=14 bbWeight=0.36 PerfScore 0.63
-G_M7461_IG09:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        lea      ecx, [ebp-0x0C]
        call     [System.Collections.Immutable.ImmutableArray`1[System.ValueTuple`3[int,int,System.__Canon]]:ToBuilder():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]]:this]
        ; gcrRegs +[eax]
-                      ;; size=9 bbWeight=1 PerfScore 3.50
-G_M7461_IG10:        ; bbWeight=1, epilog, nogc, extend
+                      ;; size=46 bbWeight=1 PerfScore 11.00
+G_M7461_IG03:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x04]
        pop      esi
        pop      ebp
        ret      
                        ;; size=6 bbWeight=1 PerfScore 2.50
 
-; Total bytes of code 99, prolog size 15, PerfScore 32.71, instruction count 36, allocated bytes for code 99 (MethodHash=7a1ee2da) for method System.Collections.Immutable.ImmutableArray:CreateBuilder[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]] (FullOpts)
+; Total bytes of code 69, prolog size 15, PerfScore 18.50, instruction count 24, allocated bytes for code 69 (MethodHash=7a1ee2da) for method System.Collections.Immutable.ImmutableArray:CreateBuilder[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]] (FullOpts)
 ; ============================================================

+14 (+7.69%) : 4394.dasm - System.Collections.Immutable.ImmutableInterlocked:GetOrAddSystem.Canon,System.Canon:System.__Canon (FullOpts) 

@@ -10,17 +10,15 @@
 ;
 ;  V00 arg0         [V00,T01] (  4,  3.50)   byref  ->  edi         single-def
 ;  V01 arg1         [V01,T00] (  5,  4   )     ref  ->  esi         class-hnd single-def <System.__Canon>
-;  V02 arg2         [V02,T05] (  3,  2   )     ref  ->  ebx         class-hnd single-def <System.Func`2[System.__Canon,System.__Canon]>
-;  V03 TypeCtx      [V03,T07] (  3,  1.68)     int  ->  [ebp+0x08]  single-def
-;  V04 loc0         [V04,T02] (  3,  3   )     ref  ->  ecx         class-hnd single-def <System.Collections.Immutable.ImmutableDictionary`2[System.__Canon,System.__Canon]>
+;  V02 arg2         [V02,T04] (  3,  2   )     ref  ->  [ebp+0x0C]  class-hnd single-def <System.Func`2[System.__Canon,System.__Canon]>
+;  V03 TypeCtx      [V03,T02] (  4,  3.50)     int  ->  ebx         single-def
+;  V04 loc0         [V04,T03] (  3,  3   )     ref  ->  [ebp-0x18]  class-hnd spill-single-def <System.Collections.Immutable.ImmutableDictionary`2[System.__Canon,System.__Canon]>
 ;  V05 loc1         [V05    ] (  4,  2.50)     ref  ->  [ebp-0x14]  do-not-enreg[X] must-init addr-exposed ld-addr-op class-hnd <System.__Canon>
 ;* V06 loc2         [V06    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V07 tmp1         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V08 tmp2         [V08,T06] (  3,  2   )     int  ->  eax         "spilling helperCall"
-;  V09 rat0         [V09,T03] (  3,  2.80)     int  ->  ecx         "spilling expr"
-;  V10 rat1         [V10,T04] (  3,  2.24)     int  ->  eax         "fgMakeTemp is creating a new local variable"
+;  V08 tmp2         [V08,T05] (  2,  2   )     int  ->  eax         "spilling helperCall"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 12
 
 G_M19900_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
        push     ebp
@@ -28,7 +26,7 @@ G_M19900_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        push     edi
        push     esi
        push     ebx
-       sub      esp, 8
+       sub      esp, 12
        xor      eax, eax
        mov      dword ptr [ebp-0x14], eax
        mov      eax, dword ptr [ebp+0x08]
@@ -37,27 +35,38 @@ G_M19900_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        ; byrRegs +[edi]
        mov      esi, edx
        ; gcrRegs +[esi]
-       mov      ebx, gword ptr [ebp+0x0C]
-       ; gcrRegs +[ebx]
+       mov      ebx, dword ptr [ebp+0x08]
                      ;; size=27 bbWeight=1 PerfScore 10.25
-G_M19900_IG02:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000080 {edi}, byref, isz
-       test     ebx, ebx
-       je       SHORT G_M19900_IG11
-       mov      ecx, gword ptr [edi]
+G_M19900_IG02:        ; bbWeight=1, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       cmp      gword ptr [ebp+0x0C], 0
+       je       SHORT G_M19900_IG07
+       mov      edx, gword ptr [edi]
+       ; gcrRegs +[edx]
+       mov      gword ptr [ebp-0x18], edx
+       ; GC ptr vars +{V04}
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       ; gcrRegs -[edx]
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, gword ptr [ebp-0x18]
        ; gcrRegs +[ecx]
        test     ecx, ecx
-       je       SHORT G_M19900_IG12
+       je       SHORT G_M19900_IG08
        lea      edx, [ebp-0x14]
        push     edx
        mov      edx, esi
        ; gcrRegs +[edx]
+       ; GC ptr vars -{V04}
        call     [System.Collections.Immutable.ImmutableDictionary`2[System.__Canon,System.__Canon]:TryGetValue(System.__Canon,byref):ubyte:this]
        ; gcrRegs -[ecx edx]
        test     eax, eax
        je       SHORT G_M19900_IG05
-                      ;; size=26 bbWeight=1 PerfScore 10.50
+                     ;; size=58 bbWeight=1 PerfScore 17.25
 G_M19900_IG03:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[ebx esi]
+       ; gcrRegs -[esi]
        ; byrRegs -[edi]
        mov      eax, gword ptr [ebp-0x14]
        ; gcrRegs +[eax]
@@ -70,36 +79,22 @@ G_M19900_IG04:        ; bbWeight=0.50, epilog, nogc, extend
        pop      ebp
        ret      8
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
-G_M19900_IG05:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000080 {edi}, gcvars, byref, isz
-       ; gcrRegs -[eax] +[ebx esi]
+G_M19900_IG05:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, gcvars, byref
+       ; gcrRegs -[eax] +[esi]
        ; byrRegs +[edi]
        mov      edx, esi
        ; gcrRegs +[edx]
-       mov      ecx, gword ptr [ebx+0x04]
+       mov      eax, gword ptr [ebp+0x0C]
+       ; gcrRegs +[eax]
+       mov      ecx, gword ptr [eax+0x04]
        ; gcrRegs +[ecx]
-       call     [ebx+0x0C]<unknown method>
-       ; gcrRegs -[ecx edx ebx] +[eax]
+       call     [eax+0x0C]<unknown method>
+       ; gcrRegs -[ecx edx]
        mov      gword ptr [ebp-0x14], eax
-       mov      ebx, dword ptr [ebp+0x08]
-       mov      ecx, dword ptr [ebx+0x20]
-       cmp      dword ptr [ecx+0x08], 20
-       jle      SHORT G_M19900_IG08
-                       ;; size=23 bbWeight=0.50 PerfScore 6.62
-G_M19900_IG06:        ; bbWeight=0.40, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
-       ; gcrRegs -[eax]
-       mov      eax, dword ptr [ecx+0x14]
-       test     eax, eax
-       je       SHORT G_M19900_IG08
-                       ;; size=7 bbWeight=0.40 PerfScore 1.30
-G_M19900_IG07:        ; bbWeight=0.32, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref, isz
-       jmp      SHORT G_M19900_IG09
-                       ;; size=2 bbWeight=0.32 PerfScore 0.64
-G_M19900_IG08:        ; bbWeight=0.18, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref
        mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=12 bbWeight=0.18 PerfScore 0.27
-G_M19900_IG09:        ; bbWeight=0.50, gcrefRegs=00000040 {esi}, byrefRegs=00000080 {edi}, byref
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
        push     gword ptr [ebp-0x14]
        push     eax
        mov      ecx, edi
@@ -109,8 +104,8 @@ G_M19900_IG09:        ; bbWeight=0.50, gcrefRegs=00000040 {esi}, byrefRegs=00000
        call     [System.Collections.Immutable.ImmutableInterlocked:GetOrAdd[System.__Canon,System.__Canon](byref,System.__Canon,System.__Canon):System.__Canon]
        ; gcrRegs -[edx esi] +[eax]
        ; byrRegs -[ecx edi]
-                      ;; size=14 bbWeight=0.50 PerfScore 2.75
-G_M19900_IG10:        ; bbWeight=0.50, epilog, nogc, extend
+                      ;; size=40 bbWeight=0.50 PerfScore 7.12
+G_M19900_IG06:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -118,11 +113,11 @@ G_M19900_IG10:        ; bbWeight=0.50, epilog, nogc, extend
        pop      ebp
        ret      8
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
-G_M19900_IG11:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+G_M19900_IG07:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        ; gcrRegs -[eax]
        mov      ecx, 0x753
        mov      edx, 0xD1FFAB1E
-       call     CORINFO_HELP_STRCNS
+       call     CORINFO_HELP_NEWARR_1_ALIGN8
        ; gcrRegs +[eax]
        mov      ecx, eax
        ; gcrRegs +[ecx]
@@ -130,10 +125,10 @@ G_M19900_IG11:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000000 {}, b
        ; gcrRegs -[eax ecx]
        int3     
                        ;; size=24 bbWeight=0 PerfScore 0.00
-G_M19900_IG12:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M19900_IG08:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, 0x76D
        mov      edx, 0xD1FFAB1E
-       call     CORINFO_HELP_STRCNS
+       call     CORINFO_HELP_NEWARR_1_ALIGN8
        ; gcrRegs +[eax]
        mov      ecx, eax
        ; gcrRegs +[ecx]
@@ -142,6 +137,6 @@ G_M19900_IG12:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        int3     
                        ;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 182, prolog size 20, PerfScore 37.34, instruction count 69, allocated bytes for code 182 (MethodHash=f847b243) for method System.Collections.Immutable.ImmutableInterlocked:GetOrAdd[System.__Canon,System.__Canon](byref,System.__Canon,System.Func`2[System.__Canon,System.__Canon]):System.__Canon (FullOpts)
+; Total bytes of code 196, prolog size 20, PerfScore 39.62, instruction count 70, allocated bytes for code 196 (MethodHash=f847b243) for method System.Collections.Immutable.ImmutableInterlocked:GetOrAdd[System.__Canon,System.__Canon](byref,System.__Canon,System.Func`2[System.__Canon,System.__Canon]):System.__Canon (FullOpts)
 ; ============================================================

+48 (+11.29%) : 7258.dasm - Microsoft.CodeAnalysis.BindingDiagnosticBag1[System.__Canon]:AddDiagnostics[System.__Canon](Microsoft.CodeAnalysis.CompoundUseSiteInfo1[System.Canon],System.Func`2[System.Canon,System.Canon],System.Canon):ubyte:this (FullOpts) 

@@ -10,32 +10,30 @@
 ;
 ;  V00 this         [V00,T02] (  5, 19   )     ref  ->  esi         this class-hnd single-def <Microsoft.CodeAnalysis.BindingDiagnosticBag`1[System.__Canon]>
 ;  V01 arg1         [V01    ] (  5,  5   )  struct (16) [ebp+0x10]  do-not-enreg[XSF] addr-exposed ld-addr-op single-def <Microsoft.CodeAnalysis.CompoundUseSiteInfo`1[System.__Canon]>
-;  V02 arg2         [V02,T05] (  4,  4   )     ref  ->  edi         class-hnd single-def <System.Func`2[System.__Canon,System.__Canon]>
-;  V03 arg3         [V03,T14] (  1,  1   )     ref  ->  [ebp+0x0C]  class-hnd single-def <System.__Canon>
-;  V04 TypeCtx      [V04,T12] (  3,  2.20)     int  ->  ecx         single-def
-;  V05 loc0         [V05,T03] (  3, 10   )     ref  ->  ebx         class-hnd single-def <<unknown class>>
-;  V06 loc1         [V06,T08] (  3,  6   )   ubyte  ->  [ebp-0x24] 
-;  V07 loc2         [V07,T04] (  2,  9   )     ref  ->  edi         class-hnd single-def <<unknown class>>
-;  V08 loc3         [V08,T00] ( 14, 40   )     ref  ->  [ebp-0x2C]  do-not-enreg[M] class-hnd EH-live <<unknown class>>
+;  V02 arg2         [V02,T06] (  4,  4   )     ref  ->  ebx         class-hnd single-def <System.Func`2[System.__Canon,System.__Canon]>
+;  V03 arg3         [V03,T12] (  1,  1   )     ref  ->  [ebp+0x0C]  class-hnd single-def <System.__Canon>
+;  V04 TypeCtx      [V04,T05] (  6,  6   )     int  ->  edi         single-def
+;  V05 loc0         [V05,T03] (  3, 10   )     ref  ->  [ebp-0x2C]  class-hnd spill-single-def <<unknown class>>
+;  V06 loc1         [V06,T09] (  3,  6   )   ubyte  ->  [ebp-0x24] 
+;  V07 loc2         [V07,T04] (  2,  9   )     ref  ->  ebx         class-hnd single-def <<unknown class>>
+;  V08 loc3         [V08,T00] ( 14, 40   )     ref  ->  [ebp-0x30]  do-not-enreg[M] class-hnd EH-live <<unknown class>>
 ;* V09 loc4         [V09    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <Microsoft.CodeAnalysis.DiagnosticInfo>
-;  V10 loc5         [V10,T13] (  2,  2   )   ubyte  ->  [ebp-0x28]  do-not-enreg[Z] must-init EH-live
+;  V10 loc5         [V10,T11] (  2,  2   )   ubyte  ->  [ebp-0x28]  do-not-enreg[Z] must-init EH-live
 ;* V11 loc6         [V11    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V12 tmp1         [V12    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V13 tmp2         [V13    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V14 tmp3         [V14    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V15 tmp4         [V15    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;* V16 tmp5         [V16,T15] (  0,  0   )   ubyte  ->  zero-ref    "Inline return value spill temp"
-;  V17 tmp6         [V17,T06] (  3,  6   )     ref  ->  ecx         class-hnd single-def "Inlining Arg" <<unknown class>>
-;* V18 tmp7         [V18,T16] (  0,  0   )   ubyte  ->  zero-ref    "Inline return value spill temp"
-;  V19 tmp8         [V19,T07] (  3,  6   )     ref  ->  ecx         class-hnd single-def "Inlining Arg" <<unknown class>>
+;* V16 tmp5         [V16,T13] (  0,  0   )   ubyte  ->  zero-ref    "Inline return value spill temp"
+;  V17 tmp6         [V17,T07] (  3,  6   )     ref  ->  ecx         class-hnd single-def "Inlining Arg" <<unknown class>>
+;* V18 tmp7         [V18,T14] (  0,  0   )   ubyte  ->  zero-ref    "Inline return value spill temp"
+;  V19 tmp8         [V19,T08] (  3,  6   )     ref  ->  ecx         class-hnd single-def "Inlining Arg" <<unknown class>>
 ;* V20 tmp9         [V20    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "Inlining Arg" <System.__Canon>
-;  V21 tmp10        [V21,T11] (  2,  4   )     int  ->  edx         "argument with side effect"
+;  V21 tmp10        [V21,T10] (  2,  4   )     int  ->  edx         "argument with side effect"
 ;  V22 tmp11        [V22,T01] (  2, 32   )     ref  ->  edx         "argument with side effect"
 ;  V23 EHSlots      [V23    ] (  1,  1   )  struct (16) [ebp-0x20]  do-not-enreg[XS] must-init addr-exposed "lvaShadowSPslotsVar"
-;  V24 rat0         [V24,T10] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V25 rat1         [V25,T09] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
 ;
-; Lcl frame size = 32
+; Lcl frame size = 36
 
 G_M43811_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, nogc <-- Prolog IG
        push     ebp
@@ -43,7 +41,7 @@ G_M43811_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, b
        push     edi
        push     esi
        push     ebx
-       sub      esp, 32
+       sub      esp, 36
        vxorps   xmm4, xmm4, xmm4
        vmovdqu  xmmword ptr [ebp-0x28], xmm4
        xor      eax, eax
@@ -53,58 +51,70 @@ G_M43811_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, b
        mov      dword ptr [ebp-0x10], eax
        mov      esi, ecx
        ; gcrRegs +[esi]
-       mov      edi, edx
-       ; gcrRegs +[edi]
-       mov      ecx, dword ptr [ebp+0x08]
-                       ;; size=39 bbWeight=1 PerfScore 13.58
-G_M43811_IG02:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       mov      ebx, gword ptr [esi+0x04]
+       mov      ebx, edx
        ; gcrRegs +[ebx]
-       test     ebx, ebx
+       mov      edi, dword ptr [ebp+0x08]
+                       ;; size=39 bbWeight=1 PerfScore 13.58
+G_M43811_IG02:        ; bbWeight=1, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref
+       mov      eax, gword ptr [esi+0x04]
+       ; gcrRegs +[eax]
+       mov      gword ptr [ebp-0x2C], eax
+       ; GC ptr vars +{V05}
+       test     eax, eax
        je       G_M43811_IG12
+       mov      ecx, edi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
        mov      ecx, gword ptr [ebp+0x10]
        ; gcrRegs +[ecx]
        test     ecx, ecx
-       je       G_M43811_IG24
+       je       G_M43811_IG21
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        test     eax, eax
-       je       G_M43811_IG24
+       je       G_M43811_IG21
        xor      eax, eax
        mov      dword ptr [ebp-0x24], eax
        mov      edx, gword ptr [ebp+0x0C]
        ; gcrRegs +[edx]
-       mov      ecx, gword ptr [edi+0x04]
+       mov      ecx, gword ptr [ebx+0x04]
        ; gcrRegs +[ecx]
-       call     [edi+0x0C]<unknown method>
-       ; gcrRegs -[ecx edx edi] +[eax]
-       mov      edi, eax
-       ; gcrRegs +[edi]
+       call     [ebx+0x0C]<unknown method>
+       ; gcrRegs -[ecx edx ebx] +[eax]
+       mov      ebx, eax
+       ; gcrRegs +[ebx]
+       mov      ecx, edi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
        mov      ecx, gword ptr [ebp+0x10]
        ; gcrRegs +[ecx]
        call     [<unknown method>]
-       ; gcrRegs -[ecx]
-       mov      gword ptr [ebp-0x2C], eax
+       ; gcrRegs -[ecx] +[eax]
+       mov      gword ptr [ebp-0x30], eax
        ; GC ptr vars +{V08}
-                     ;; size=64 bbWeight=1 PerfScore 22.25
-G_M43811_IG03:        ; bbWeight=1, gcVars=00000001 {V08}, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
+                       ;; size=91 bbWeight=1 PerfScore 26.25
+G_M43811_IG03:        ; bbWeight=1, gcVars=00000009 {V05 V08}, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs -[eax]
-       mov      ecx, gword ptr [ebp-0x2C]
+       mov      ecx, gword ptr [ebp-0x30]
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        test     eax, eax
        je       SHORT G_M43811_IG07
                        ;; size=13 bbWeight=1 PerfScore 5.25
-G_M43811_IG04:        ; bbWeight=8, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, gword ptr [ebp-0x2C]
+G_M43811_IG04:        ; bbWeight=8, gcrefRegs=00000048 {ebx esi}, byrefRegs=00000000 {}, byref, isz
+       mov      ecx, gword ptr [ebp-0x30]
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx] +[eax]
        mov      edx, eax
        ; gcrRegs +[edx]
-       push     ebx
+       mov      edi, gword ptr [ebp-0x2C]
+       ; gcrRegs +[edi]
        push     edi
+       push     ebx
        mov      ecx, esi
        ; gcrRegs +[ecx]
        mov      eax, dword ptr [esi]
@@ -114,21 +124,22 @@ G_M43811_IG04:        ; bbWeight=8, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=
        ; gcrRegs -[ecx edx]
        test     eax, eax
        je       SHORT G_M43811_IG06
-                      ;; size=27 bbWeight=8 PerfScore 118.00
+                        ;; size=30 bbWeight=8 PerfScore 126.00
 G_M43811_IG05:        ; bbWeight=4, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref
        mov      dword ptr [ebp-0x24], 1
                        ;; size=7 bbWeight=4 PerfScore 4.00
 G_M43811_IG06:        ; bbWeight=8, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, gword ptr [ebp-0x2C]
+       mov      ecx, gword ptr [ebp-0x30]
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        test     eax, eax
        jne      SHORT G_M43811_IG04
                        ;; size=13 bbWeight=8 PerfScore 42.00
-G_M43811_IG07:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
+G_M43811_IG07:        ; bbWeight=1, gcVars=00000001 {V08}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; gcrRegs -[ebx esi edi]
-       mov      ecx, gword ptr [ebp-0x2C]
+       ; GC ptr vars -{V05}
+       mov      ecx, gword ptr [ebp-0x30]
        ; gcrRegs +[ecx]
        ; GC ptr vars -{V08}
        call     [<unknown method>]
@@ -137,9 +148,9 @@ G_M43811_IG07:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
                        ;; size=11 bbWeight=1 PerfScore 6.00
 G_M43811_IG08:        ; bbWeight=0, gcVars=00000001 {V08}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
        ; GC ptr vars +{V00 V08}
-       cmp      gword ptr [ebp-0x2C], 0
+       cmp      gword ptr [ebp-0x30], 0
        je       SHORT G_M43811_IG09
-       mov      ecx, gword ptr [ebp-0x2C]
+       mov      ecx, gword ptr [ebp-0x30]
        ; gcrRegs +[ecx]
        ; GC ptr vars -{V00 V08}
        call     [<unknown method>]
@@ -151,7 +162,7 @@ G_M43811_IG09:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
                        ;; size=3 bbWeight=0 PerfScore 0.00
 G_M43811_IG10:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        cmp      dword ptr [ebp-0x24], 0
-       je       G_M43811_IG24
+       je       G_M43811_IG21
        mov      eax, 1
                        ;; size=15 bbWeight=1 PerfScore 3.25
 G_M43811_IG11:        ; bbWeight=1, epilog, nogc, extend
@@ -162,103 +173,99 @@ G_M43811_IG11:        ; bbWeight=1, epilog, nogc, extend
        pop      ebp
        ret      24
                        ;; size=10 bbWeight=1 PerfScore 4.50
-G_M43811_IG12:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
-       mov      edx, dword ptr [ecx+0x20]
-       mov      edx, dword ptr [edx+0x08]
-       test     edx, edx
-       je       SHORT G_M43811_IG14
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M43811_IG13:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M43811_IG15
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M43811_IG14:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M43811_IG12:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+       mov      ecx, edi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      edx, eax
-                        ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M43811_IG15:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
        lea      ecx, [ebp+0x10]
        call     [Microsoft.CodeAnalysis.CompoundUseSiteInfo`1[System.__Canon]:get_AccumulatesDiagnostics():ubyte:this]
        test     eax, eax
-       je       G_M43811_IG24
+       je       G_M43811_IG21
+       mov      ecx, edi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
        mov      ecx, gword ptr [ebp+0x10]
        ; gcrRegs +[ecx]
        test     ecx, ecx
-       je       G_M43811_IG24
+       je       G_M43811_IG21
        call     [<unknown method>]
        ; gcrRegs -[ecx]
        test     eax, eax
-       je       SHORT G_M43811_IG24
+       je       G_M43811_IG21
+       mov      ecx, edi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
        mov      ecx, gword ptr [ebp+0x10]
        ; gcrRegs +[ecx]
        call     [<unknown method>]
        ; gcrRegs -[ecx] +[eax]
-       mov      gword ptr [ebp-0x2C], eax
+       mov      gword ptr [ebp-0x30], eax
        ; GC ptr vars +{V08}
-                      ;; size=50 bbWeight=1 PerfScore 16.25
-G_M43811_IG16:        ; bbWeight=1, gcVars=00000001 {V08}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, isz
+                      ;; size=92 bbWeight=1 PerfScore 21.00
...

+8 (+17.02%) : 7376.dasm - System.Collections.Immutable.ImmutableArray1[System.__Canon]:As[System.__Canon]():System.Collections.Immutable.ImmutableArray1[System.__Canon]:this (FullOpts) 

@@ -8,57 +8,52 @@
 ; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T02] (  3,  3   )   byref  ->  esi         this single-def
-;  V01 TypeCtx      [V01,T00] (  5,  4.20)     int  ->  edx         single-def
-;* V02 loc0         [V02    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
+;  V00 this         [V00,T01] (  3,  3   )   byref  ->  edi         this single-def
+;  V01 TypeCtx      [V01,T00] (  5,  5   )     int  ->  esi         single-def
+;  V02 loc0         [V02,T02] (  2,  4   )     int  ->  ebx         "spilling helperCall"
 ;* V03 tmp1         [V03    ] (  0,  0   )  struct ( 4) zero-ref    ld-addr-op "NewObj constructor temp" <System.Collections.Immutable.ImmutableArray`1[System.__Canon]>
 ;* V04 tmp2         [V04    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V05 tmp3         [V05    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "Inlining Arg" <System.__Canon[]>
-;  V06 tmp4         [V06,T05] (  2,  2   )     ref  ->  eax         single-def "field V03.array (fldOffset=0x0)" P-INDEP
-;  V07 tmp5         [V07,T04] (  2,  4   )     int  ->  ecx         "argument with side effect"
-;  V08 rat0         [V08,T03] (  3,  4   )     int  ->  ecx         "runtime lookup"
-;  V09 rat1         [V09,T01] (  3,  5.60)     int  ->  ecx         "fgMakeTemp is creating a new local variable"
+;  V06 tmp4         [V06,T03] (  2,  2   )     ref  ->  eax         single-def "field V03.array (fldOffset=0x0)" P-INDEP
 ;
 ; Lcl frame size = 4
 
 G_M44373_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
        push     ebp
        mov      ebp, esp
+       push     edi
        push     esi
+       push     ebx
        push     eax
-       mov      dword ptr [ebp-0x08], edx
-       mov      esi, ecx
-       ; byrRegs +[esi]
-                       ;; size=10 bbWeight=1 PerfScore 4.50
-G_M44373_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
-       mov      ecx, dword ptr [edx+0x20]
-       mov      ecx, dword ptr [ecx+0x08]
-       test     ecx, ecx
-       je       SHORT G_M44373_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M44373_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref, isz
-       jmp      SHORT G_M44373_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M44373_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
-       mov      ecx, edx
+       mov      dword ptr [ebp-0x10], edx
+       mov      edi, ecx
+       ; byrRegs +[edi]
+       mov      esi, edx
+                       ;; size=14 bbWeight=1 PerfScore 6.75
+G_M44373_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000080 {edi}, byref
+       mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      ecx, eax
-                       ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M44373_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000040 {esi}, byref
-       mov      edx, gword ptr [esi]
+       call     CORINFO_HELP_MEMCPY
+       mov      ebx, eax
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      edx, gword ptr [edi]
        ; gcrRegs +[edx]
-       call     CORINFO_HELP_ISINSTANCEOFARRAY
+       mov      ecx, ebx
+       call     CORINFO_HELP_ISINSTANCEOFINTERFACE
        ; gcrRegs -[edx] +[eax]
-       ; byrRegs -[esi]
-                       ;; size=7 bbWeight=1 PerfScore 3.00
-G_M44373_IG06:        ; bbWeight=1, epilog, nogc, extend
+       ; byrRegs -[edi]
+                       ;; size=35 bbWeight=1 PerfScore 6.50
+G_M44373_IG03:        ; bbWeight=1, epilog, nogc, extend
        pop      ecx
+       pop      ebx
        pop      esi
+       pop      edi
        pop      ebp
        ret      
-                     ;; size=4 bbWeight=1 PerfScore 2.50
+                       ;; size=6 bbWeight=1 PerfScore 3.50
 
-; Total bytes of code 47, prolog size 8, PerfScore 17.20, instruction count 21, allocated bytes for code 47 (MethodHash=e6fb52aa) for method System.Collections.Immutable.ImmutableArray`1[System.__Canon]:As[System.__Canon]():System.Collections.Immutable.ImmutableArray`1[System.__Canon]:this (FullOpts)
+; Total bytes of code 55, prolog size 10, PerfScore 16.75, instruction count 25, allocated bytes for code 55 (MethodHash=e6fb52aa) for method System.Collections.Immutable.ImmutableArray`1[System.__Canon]:As[System.__Canon]():System.Collections.Immutable.ImmutableArray`1[System.__Canon]:this (FullOpts)
 ; ============================================================

realworld.run.windows.x86.checked.mch

-14 (-32.56%) : 12710.dasm - System.Linq.Enumerable:EmptySystem.Collections.Generic.KeyValuePair2[System.__Canon,int]]():System.Collections.Generic.IEnumerable1[System.Collections.Generic.KeyValuePair`2[System.__Canon,int] 

@@ -7,10 +7,8 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->  ecx         single-def
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->  ecx         single-def
 ;* V01 loc0         [V01    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V02 rat0         [V02,T02] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V03 rat1         [V03,T01] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 4
 
@@ -20,31 +18,19 @@ G_M43414_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        push     eax
        mov      dword ptr [ebp-0x04], ecx
                        ;; size=7 bbWeight=1 PerfScore 3.25
-G_M43414_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, dword ptr [ecx+0x20]
-       mov      edx, dword ptr [edx+0x08]
-       test     edx, edx
-       je       SHORT G_M43414_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M43414_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M43414_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M43414_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M43414_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edx, eax
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M43414_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       mov      ecx, edx
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, eax
        call     [System.Array:Empty[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]():System.Collections.Generic.KeyValuePair`2[System.__Canon,int][]]
        ; gcrRegs +[eax]
-                      ;; size=8 bbWeight=1 PerfScore 3.25
-G_M43414_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=18 bbWeight=1 PerfScore 4.50
+G_M43414_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 43, prolog size 7, PerfScore 15.40, instruction count 17, allocated bytes for code 43 (MethodHash=4ae05669) for method System.Linq.Enumerable:Empty[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]():System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]] (FullOpts)
+; Total bytes of code 29, prolog size 7, PerfScore 9.50, instruction count 11, allocated bytes for code 29 (MethodHash=4ae05669) for method System.Linq.Enumerable:Empty[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]():System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]] (FullOpts)
 ; ============================================================

-14 (-32.56%) : 10176.dasm - Microsoft.FSharp.Collections.SeqModule:EmptySystem.__Canon:System.Collections.Generic.IEnumerable`1System.__Canon 

@@ -7,10 +7,8 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  5,  4.20)     int  ->  ecx         single-def
+;  V00 TypeCtx      [V00,T00] (  4,  4   )     int  ->  ecx         single-def
 ;* V01 loc0         [V01    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V02 rat0         [V02,T02] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V03 rat1         [V03,T01] (  3,  5.60)     int  ->  edx         "fgMakeTemp is creating a new local variable"
 ;
 ; Lcl frame size = 4
 
@@ -20,31 +18,19 @@ G_M15963_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        push     eax
        mov      dword ptr [ebp-0x04], ecx
                        ;; size=7 bbWeight=1 PerfScore 3.25
-G_M15963_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, dword ptr [ecx+0x20]
-       mov      edx, dword ptr [edx+0x08]
-       test     edx, edx
-       je       SHORT G_M15963_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M15963_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M15963_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M15963_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M15963_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edx, eax
-                       ;; size=12 bbWeight=0.20 PerfScore 0.30
-G_M15963_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       mov      ecx, edx
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, eax
        call     [Microsoft.FSharp.Collections.IEnumerator+EmptyEnumerable`1[System.__Canon]:get_EmptyEnumerable():Microsoft.FSharp.Collections.IEnumerator+EmptyEnumerable`1[System.__Canon]]
        ; gcrRegs +[eax]
-                      ;; size=8 bbWeight=1 PerfScore 3.25
-G_M15963_IG06:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=18 bbWeight=1 PerfScore 4.50
+G_M15963_IG03:        ; bbWeight=1, epilog, nogc, extend
        mov      esp, ebp
        pop      ebp
        ret      
                        ;; size=4 bbWeight=1 PerfScore 1.75
 
-; Total bytes of code 43, prolog size 7, PerfScore 15.40, instruction count 17, allocated bytes for code 43 (MethodHash=3ea8c1a4) for method Microsoft.FSharp.Collections.SeqModule:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
+; Total bytes of code 29, prolog size 7, PerfScore 9.50, instruction count 11, allocated bytes for code 29 (MethodHash=3ea8c1a4) for method Microsoft.FSharp.Collections.SeqModule:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
 ; ============================================================

-30 (-30.30%) : 5030.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilderSystem.__Canon:System.Collections.Immutable.ImmutableArray`1+BuilderSystem.__Canon 

@@ -7,17 +7,12 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 TypeCtx      [V00,T00] (  7,  5.56)     int  ->  esi         single-def
+;  V00 TypeCtx      [V00,T00] (  5,  5   )     int  ->  esi         single-def
 ;  V01 loc0         [V01    ] (  2,  2   )  struct ( 4) [ebp-0x0C]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Immutable.ImmutableArray`1[System.__Canon]>
 ;* V02 loc1         [V02    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;* V03 tmp1         [V03    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
 ;  V04 tmp2         [V04    ] (  2,  2   )     ref  ->  [ebp-0x0C]  do-not-enreg[X] addr-exposed "field V01.array (fldOffset=0x0)" P-DEP
-;  V05 tmp3         [V05,T06] (  2,  4   )     int  ->  edx         "argument with side effect"
-;  V06 rat0         [V06,T04] (  3,  4   )     int  ->  ecx         "runtime lookup"
-;  V07 rat1         [V07,T01] (  3,  5.60)     int  ->  ecx         "fgMakeTemp is creating a new local variable"
-;  V08 rat2         [V08,T05] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V09 rat3         [V09,T02] (  3,  5.60)     int  ->  ecx         "spilling expr"
-;  V10 rat4         [V10,T03] (  3,  4.48)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V05 tmp3         [V05,T01] (  2,  4   )     int  ->  edx         "argument with side effect"
 ;
 ; Lcl frame size = 8
 
@@ -31,56 +26,30 @@ G_M23077_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      dword ptr [ebp-0x08], ecx
        mov      esi, ecx
                        ;; size=17 bbWeight=1 PerfScore 5.00
-G_M23077_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       mov      ecx, dword ptr [esi+0x20]
-       mov      ecx, dword ptr [ecx+0x08]
-       test     ecx, ecx
-       je       SHORT G_M23077_IG04
-                       ;; size=10 bbWeight=1 PerfScore 5.25
-G_M23077_IG03:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M23077_IG05
-                       ;; size=2 bbWeight=0.80 PerfScore 1.60
-G_M23077_IG04:        ; bbWeight=0.20, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M23077_IG02:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
        mov      ecx, eax
-                        ;; size=14 bbWeight=0.20 PerfScore 0.35
-G_M23077_IG05:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
        call     [System.Collections.Immutable.ImmutableArray:Create[System.__Canon]():System.Collections.Immutable.ImmutableArray`1[System.__Canon]]
        ; gcrRegs +[eax]
        mov      gword ptr [ebp-0x0C], eax
-       mov      ecx, dword ptr [esi+0x20]
-       cmp      dword ptr [ecx+0x04], 12
-       jle      SHORT G_M23077_IG08
-                       ;; size=18 bbWeight=1 PerfScore 10.00
-G_M23077_IG06:        ; bbWeight=0.80, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       ; gcrRegs -[eax]
-       mov      edx, dword ptr [ecx+0x0C]
-       test     edx, edx
-       je       SHORT G_M23077_IG08
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M23077_IG07:        ; bbWeight=0.64, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M23077_IG09
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M23077_IG08:        ; bbWeight=0.36, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
        mov      edx, eax
-                      ;; size=14 bbWeight=0.36 PerfScore 0.63
-G_M23077_IG09:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        lea      ecx, [ebp-0x0C]
        call     [System.Collections.Immutable.ImmutableArray`1[System.__Canon]:ToBuilder():System.Collections.Immutable.ImmutableArray`1+Builder[System.__Canon]:this]
        ; gcrRegs +[eax]
-                      ;; size=9 bbWeight=1 PerfScore 3.50
-G_M23077_IG10:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=46 bbWeight=1 PerfScore 11.00
+G_M23077_IG03:        ; bbWeight=1, epilog, nogc, extend
        lea      esp, [ebp-0x04]
        pop      esi
        pop      ebp
        ret      
                        ;; size=6 bbWeight=1 PerfScore 2.50
 
-; Total bytes of code 99, prolog size 15, PerfScore 32.71, instruction count 36, allocated bytes for code 99 (MethodHash=10a6a5da) for method System.Collections.Immutable.ImmutableArray:CreateBuilder[System.__Canon]():System.Collections.Immutable.ImmutableArray`1+Builder[System.__Canon] (FullOpts)
+; Total bytes of code 69, prolog size 15, PerfScore 18.50, instruction count 24, allocated bytes for code 69 (MethodHash=10a6a5da) for method System.Collections.Immutable.ImmutableArray:CreateBuilder[System.__Canon]():System.Collections.Immutable.ImmutableArray`1+Builder[System.__Canon] (FullOpts)
 ; ============================================================

-2 (-1.49%) : 2248.dasm - System.Array:IndexOfSystem.__Canon:int (FullOpts) 

@@ -9,10 +9,10 @@
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T00] (  5,  5   )     ref  ->  esi         class-hnd single-def <System.__Canon[]>
-;  V01 arg1         [V01,T03] (  3,  3   )     ref  ->  edi         ld-addr-op class-hnd single-def <System.__Canon>
-;  V02 arg2         [V02,T06] (  3,  3   )     int  ->  ebx         single-def
-;  V03 arg3         [V03,T09] (  2,  2   )     int  ->  [ebp+0x0C]  single-def
-;  V04 TypeCtx      [V04,T08] (  3,  2.36)     int  ->  ecx         single-def
+;  V01 arg1         [V01,T02] (  3,  3   )     ref  ->  edi         ld-addr-op class-hnd single-def <System.__Canon>
+;  V02 arg2         [V02,T03] (  3,  3   )     int  ->  ebx         single-def
+;  V03 arg3         [V03,T06] (  2,  2   )     int  ->  [ebp+0x0C]  single-def
+;  V04 TypeCtx      [V04,T04] (  3,  3   )     int  ->  [ebp+0x08]  single-def
 ;* V05 loc0         [V05    ] (  0,  0   )     int  ->  zero-ref   
 ;* V06 loc1         [V06    ] (  0,  0   )     int  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref   
@@ -25,10 +25,7 @@
 ;* V14 tmp5         [V14    ] (  0,  0   )     int  ->  zero-ref    "Inline return value spill temp"
 ;* V15 tmp6         [V15    ] (  0,  0   )     int  ->  zero-ref    ld-addr-op "Inlining Arg"
 ;  V16 tmp7         [V16,T01] (  3,  6   )     ref  ->  eax         single-def "argument with side effect"
-;  V17 cse0         [V17,T07] (  3,  3   )     int  ->  edx         "CSE - aggressive"
-;  V18 rat0         [V18,T05] (  3,  4   )     int  ->  edx         "runtime lookup"
-;  V19 rat1         [V19,T02] (  3,  5.60)     int  ->  edx         "spilling expr"
-;  V20 rat2         [V20,T04] (  3,  4.48)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V17 cse0         [V17,T05] (  3,  3   )     int  ->  ecx         "CSE - aggressive"
 ;
 ; Lcl frame size = 4
 
@@ -46,38 +43,27 @@ G_M13831_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}
        mov      edi, edx
        ; gcrRegs +[edi]
        mov      ebx, dword ptr [ebp+0x10]
-       mov      eax, dword ptr [ebp+0x0C]
-       mov      ecx, dword ptr [ebp+0x08]
+       mov      edx, dword ptr [ebp+0x0C]
+       mov      eax, dword ptr [ebp+0x08]
                       ;; size=26 bbWeight=1 PerfScore 11.75
 G_M13831_IG02:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
        test     esi, esi
-       je       SHORT G_M13831_IG08
-       mov      edx, dword ptr [esi+0x04]
-       cmp      edx, ebx
-       jb       SHORT G_M13831_IG09
-       sub      edx, ebx
-       mov      dword ptr [ebp+0x0C], eax
-       cmp      edx, eax
-       jb       SHORT G_M13831_IG10
-       mov      edx, dword ptr [ecx+0x20]
-       cmp      dword ptr [edx+0x04], 12
-       jle      SHORT G_M13831_IG05
-                       ;; size=29 bbWeight=1 PerfScore 13.00
-G_M13831_IG03:        ; bbWeight=0.80, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, dword ptr [edx+0x0C]
-       test     edx, edx
-       je       SHORT G_M13831_IG05
-                       ;; size=7 bbWeight=0.80 PerfScore 2.60
-G_M13831_IG04:        ; bbWeight=0.64, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
-       jmp      SHORT G_M13831_IG06
-                       ;; size=2 bbWeight=0.64 PerfScore 1.28
-G_M13831_IG05:        ; bbWeight=0.36, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
+       je       SHORT G_M13831_IG04
+       mov      ecx, dword ptr [esi+0x04]
+       cmp      ecx, ebx
+       jb       SHORT G_M13831_IG05
+       sub      ecx, ebx
+       mov      dword ptr [ebp+0x0C], edx
+       cmp      ecx, edx
+       jb       SHORT G_M13831_IG06
+       mov      dword ptr [ebp+0x08], eax
+       mov      ecx, eax
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edx, eax
-                       ;; size=12 bbWeight=0.36 PerfScore 0.54
-G_M13831_IG06:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref
-       mov      ecx, edx
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, dword ptr [ebp+0x08]
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      ecx, eax
        call     [System.Collections.Generic.EqualityComparer`1[System.__Canon]:get_Default():System.Collections.Generic.EqualityComparer`1[System.__Canon]]
        ; gcrRegs +[eax]
        push     edi
@@ -92,8 +78,8 @@ G_M13831_IG06:        ; bbWeight=1, gcrefRegs=000000C0 {esi edi}, byrefRegs=0000
        mov      eax, dword ptr [eax+0x30]
        call     [eax]<unknown method>
        ; gcrRegs -[ecx edx esi edi]
-                      ;; size=24 bbWeight=1 PerfScore 13.75
-G_M13831_IG07:        ; bbWeight=1, epilog, nogc, extend
+                     ;; size=72 bbWeight=1 PerfScore 25.50
+G_M13831_IG03:        ; bbWeight=1, epilog, nogc, extend
        pop      ecx
        pop      ebx
        pop      esi
@@ -101,20 +87,20 @@ G_M13831_IG07:        ; bbWeight=1, epilog, nogc, extend
        pop      ebp
        ret      12
                        ;; size=8 bbWeight=1 PerfScore 4.50
-G_M13831_IG08:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+G_M13831_IG04:        ; bbWeight=0, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        mov      ecx, 2
        call     [System.ThrowHelper:ThrowArgumentNullException(int)]
        int3     
                        ;; size=12 bbWeight=0 PerfScore 0.00
-G_M13831_IG09:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M13831_IG05:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        call     [System.ThrowHelper:ThrowStartIndexArgumentOutOfRange_ArgumentOutOfRange_IndexMustBeLessOrEqual()]
        int3     
                        ;; size=7 bbWeight=0 PerfScore 0.00
-G_M13831_IG10:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
+G_M13831_IG06:        ; bbWeight=0, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
        call     [System.ThrowHelper:ThrowCountArgumentOutOfRange_ArgumentOutOfRange_Count()]
        int3     
                        ;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 134, prolog size 13, PerfScore 47.42, instruction count 55, allocated bytes for code 134 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
+; Total bytes of code 132, prolog size 13, PerfScore 41.75, instruction count 52, allocated bytes for code 132 (MethodHash=0c9bc9f8) for method System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (FullOpts)
 ; ============================================================

-2 (-1.29%) : 11369.dasm - .$Set:loop@914-47System.__Canon:ubyte (FullOpts) 

@@ -7,24 +7,21 @@
 ; No matching PGO data
 ; Final local variable assignments
 ;
-;  V00 arg0         [V00,T08] (  3,  6   )     ref  ->  ebx         class-hnd single-def <System.Collections.IEqualityComparer>
-;  V01 arg1         [V01,T03] (  4, 14   )     ref  ->  esi         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.__Canon]>
-;  V02 arg2         [V02,T07] (  2, 12   )     ref  ->  edi         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.__Canon]>
+;  V00 arg0         [V00,T07] (  3,  6   )     ref  ->  [ebp-0x20]  class-hnd single-def <System.Collections.IEqualityComparer>
+;  V01 arg1         [V01,T01] (  4, 14   )     ref  ->  esi         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.__Canon]>
+;  V02 arg2         [V02,T05] (  2, 12   )     ref  ->  edi         class-hnd single-def <System.Collections.Generic.IEnumerator`1[System.__Canon]>
 ;* V03 arg3         [V03    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def <Microsoft.FSharp.Core.Unit>
-;  V04 TypeCtx      [V04,T10] (  3,  5.80)     int  ->  [ebp+0x08]  single-def
-;  V05 loc0         [V05,T02] (  3, 20   )   ubyte  ->  [ebp-0x14]  spill-single-def
+;  V04 TypeCtx      [V04,T06] (  3,  9   )     int  ->  ebx         single-def
+;  V05 loc0         [V05,T00] (  3, 20   )   ubyte  ->  [ebp-0x14]  spill-single-def
 ;* V06 loc1         [V06    ] (  0,  0   )   ubyte  ->  zero-ref   
 ;* V07 loc2         [V07    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;* V08 tmp1         [V08,T09] (  0,  0   )     int  ->  zero-ref    "VirtualCall with runtime lookup"
+;  V08 tmp1         [V08,T03] (  2, 16   )     int  ->  [ebp-0x18]  spill-single-def "VirtualCall with runtime lookup"
 ;* V09 tmp2         [V09    ] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V10 tmp3         [V10,T00] (  3, 24   )     int  ->  [ebp-0x18]  spill-single-def "VirtualCall with runtime lookup"
+;  V10 tmp3         [V10,T04] (  2, 16   )     int  ->  [ebp-0x1C]  spill-single-def "VirtualCall with runtime lookup"
 ;* V11 tmp4         [V11    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "non-inline candidate call" <<unknown class>>
-;  V12 tmp5         [V12,T05] (  2, 16   )     ref  ->  [ebp-0x1C]  spill-single-def "argument with side effect"
-;  V13 cse0         [V13,T06] (  2,  8   )     int  ->  edx         "CSE - moderate"
-;  V14 rat0         [V14,T04] (  3, 16   )     int  ->  edx         "runtime lookup"
-;  V15 rat1         [V15,T01] (  3, 22.40)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V12 tmp5         [V12,T02] (  2, 16   )     ref  ->  [ebp-0x24]  spill-single-def "argument with side effect"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 24
 
 G_M22437_IG01:        ; bbWeight=8, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, nogc <-- Prolog IG
        push     ebp
@@ -32,17 +29,18 @@ G_M22437_IG01:        ; bbWeight=8, gcVars=00000000 {}, gcrefRegs=00000000 {}, b
        push     edi
        push     esi
        push     ebx
-       sub      esp, 16
+       sub      esp, 24
        mov      eax, dword ptr [ebp+0x08]
        mov      dword ptr [ebp-0x10], eax
-       mov      ebx, ecx
-       ; gcrRegs +[ebx]
+       mov      gword ptr [ebp-0x20], ecx
+       ; GC ptr vars +{V00}
        mov      esi, edx
        ; gcrRegs +[esi]
        mov      edi, gword ptr [ebp+0x10]
        ; gcrRegs +[edi]
-                      ;; size=22 bbWeight=8 PerfScore 72.00
-G_M22437_IG02:        ; bbWeight=8, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
+       mov      ebx, dword ptr [ebp+0x08]
+                       ;; size=26 bbWeight=8 PerfScore 86.00
+G_M22437_IG02:        ; bbWeight=8, gcVars=00000080 {V00}, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, gcvars, byref, isz
        mov      ecx, esi
        ; gcrRegs +[ecx]
        call     [<unknown method>]
@@ -54,61 +52,51 @@ G_M22437_IG02:        ; bbWeight=8, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=
        ; gcrRegs -[ecx]
        mov      ecx, dword ptr [ebp-0x14]
        cmp      eax, ecx
-       jne      SHORT G_M22437_IG07
+       jne      SHORT G_M22437_IG04
                      ;; size=26 bbWeight=8 PerfScore 78.00
-G_M22437_IG03:        ; bbWeight=4, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
+G_M22437_IG03:        ; bbWeight=4, gcrefRegs=000000C0 {esi edi}, byrefRegs=00000000 {}, byref, isz
        test     ecx, ecx
-       je       SHORT G_M22437_IG09
-       mov      eax, dword ptr [ebp+0x08]
-       mov      ecx, dword ptr [eax+0x20]
-       mov      edx, dword ptr [ecx+0x08]
-       test     edx, edx
-       je       SHORT G_M22437_IG05
-                       ;; size=17 bbWeight=4 PerfScore 30.00
-G_M22437_IG04:        ; bbWeight=3.20, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      dword ptr [ebp+0x08], eax
-       jmp      SHORT G_M22437_IG06
-                       ;; size=5 bbWeight=3.20 PerfScore 9.60
-G_M22437_IG05:        ; bbWeight=0.80, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref
-       mov      dword ptr [ebp+0x08], eax
-       mov      ecx, eax
+       je       SHORT G_M22437_IG06
+       mov      ecx, ebx
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-       mov      edx, eax
-                       ;; size=17 bbWeight=0.80 PerfScore 2.20
-G_M22437_IG06:        ; bbWeight=4, gcrefRegs=000000C8 {ebx esi edi}, byrefRegs=00000000 {}, byref, isz
-       mov      dword ptr [ebp-0x18], edx
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x18], eax
+       mov      ecx, ebx
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x1C], eax
        mov      ecx, esi
        ; gcrRegs +[ecx]
-       mov      eax, edx
+       mov      eax, dword ptr [ebp-0x18]
        nop      
        call     [eax]
        ; gcrRegs -[ecx] +[eax]
-       mov      gword ptr [ebp-0x1C], eax
+       mov      gword ptr [ebp-0x24], eax
        ; GC ptr vars +{V12}
        mov      ecx, edi
        ; gcrRegs +[ecx]
-       mov      eax, dword ptr [ebp-0x18]
+       mov      eax, dword ptr [ebp-0x1C]
        ; gcrRegs -[eax]
        nop      
        call     [eax]
        ; gcrRegs -[ecx] +[eax]
        push     eax
-       mov      edx, gword ptr [ebp-0x1C]
+       mov      edx, gword ptr [ebp-0x24]
        ; gcrRegs +[edx]
-       mov      ecx, ebx
+       mov      ecx, gword ptr [ebp-0x20]
        ; gcrRegs +[ecx]
        ; GC ptr vars -{V12}
        call     [<unknown method>]
        ; gcrRegs -[eax ecx edx]
        test     eax, eax
        jne      SHORT G_M22437_IG02
-                      ;; size=41 bbWeight=4 PerfScore 67.00
-G_M22437_IG07:        ; bbWeight=0.50, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref
-       ; gcrRegs -[ebx esi edi]
+                      ;; size=74 bbWeight=4 PerfScore 94.00
+G_M22437_IG04:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+       ; gcrRegs -[esi edi]
+       ; GC ptr vars -{V00}
        xor      eax, eax
                        ;; size=2 bbWeight=0.50 PerfScore 0.12
-G_M22437_IG08:        ; bbWeight=0.50, epilog, nogc, extend
+G_M22437_IG05:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -116,10 +104,10 @@ G_M22437_IG08:        ; bbWeight=0.50, epilog, nogc, extend
        pop      ebp
        ret      12
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
-G_M22437_IG09:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
+G_M22437_IG06:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref
        mov      eax, 1
                        ;; size=5 bbWeight=0.50 PerfScore 0.12
-G_M22437_IG10:        ; bbWeight=0.50, epilog, nogc, extend
+G_M22437_IG07:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -128,6 +116,6 @@ G_M22437_IG10:        ; bbWeight=0.50, epilog, nogc, extend
        ret      12
                        ;; size=10 bbWeight=0.50 PerfScore 2.25
 
-; Total bytes of code 155, prolog size 15, PerfScore 263.55, instruction count 63, allocated bytes for code 155 (MethodHash=0ec8a85a) for method <StartupCode$FSharp-Core>.$Set:loop@914-47[System.__Canon](System.Collections.IEqualityComparer,System.Collections.Generic.IEnumerator`1[System.__Canon],System.Collections.Generic.IEnumerator`1[System.__Canon],Microsoft.FSharp.Core.Unit):ubyte (FullOpts)
+; Total bytes of code 153, prolog size 15, PerfScore 262.75, instruction count 59, allocated bytes for code 153 (MethodHash=0ec8a85a) for method <StartupCode$FSharp-Core>.$Set:loop@914-47[System.__Canon](System.Collections.IEqualityComparer,System.Collections.Generic.IEnumerator`1[System.__Canon],System.Collections.Generic.IEnumerator`1[System.__Canon],Microsoft.FSharp.Core.Unit):ubyte (FullOpts)
 ; ============================================================

-1 (-0.60%) : 2110.dasm - Microsoft.FSharp.Primitives.Basics.List:revSystem.__Canon:Microsoft.FSharp.Collections.FSharpList`1System.__Canon 

@@ -8,125 +8,85 @@
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T01] (  5,  4   )     ref  ->  ecx         class-hnd single-def <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
-;  V01 TypeCtx      [V01,T00] (  7,  4.28)     int  ->  esi         single-def
+;  V01 TypeCtx      [V01,T00] (  7,  5   )     int  ->  esi         single-def
 ;* V02 loc0         [V02    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact single-def <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
-;  V03 loc1         [V03,T15] (  2,  1   )     ref  ->  eax         class-hnd exact single-def <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
-;  V04 loc2         [V04,T16] (  2,  1   )     ref  ->  edi         class-hnd exact single-def <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
-;  V05 loc3         [V05,T17] (  2,  1   )     ref  ->  ebx         class-hnd single-def <System.__Canon>
-;  V06 loc4         [V06,T18] (  2,  1   )     ref  ->  [ebp-0x1C]  class-hnd spill-single-def <System.__Canon>
-;* V07 loc5         [V07,T19] (  0,  0   )     int  ->  zero-ref    "spilling helperCall"
-;  V08 tmp1         [V08,T13] (  2,  2   )     int  ->  [ebp-0x14]  spill-single-def "spilling helperCall"
-;  V09 tmp2         [V09,T03] (  3,  3   )     int  ->  [ebp-0x18]  spill-single-def "spilling helperCall"
-;  V10 tmp3         [V10,T08] (  3,  2   )     int  ->  esi         "spilling helperCall"
-;  V11 tmp4         [V11,T10] (  2,  2   )     ref  ->  edx         single-def "argument with side effect"
-;  V12 tmp5         [V12,T11] (  2,  2   )     ref  ->  edx         single-def "argument with side effect"
-;  V13 tmp6         [V13,T12] (  2,  2   )     ref  ->  edx         single-def "argument with side effect"
-;  V14 cse0         [V14,T07] (  3,  1.50)     int  ->  eax         "CSE - moderate"
-;  V15 cse1         [V15,T14] (  3,  1.50)     ref  ->  edi         "CSE - moderate"
-;  V16 cse2         [V16,T02] (  4,  3   )     ref  ->  eax         "CSE - aggressive"
-;  V17 rat0         [V17,T09] (  3,  2   )     int  ->  eax         "runtime lookup"
-;  V18 rat1         [V18,T04] (  3,  2.80)     int  ->  eax         "fgMakeTemp is creating a new local variable"
-;  V19 rat2         [V19,T05] (  3,  2.80)     int  ->  edx         "spilling expr"
-;  V20 rat3         [V20,T06] (  3,  2.24)     int  ->  edx         "fgMakeTemp is creating a new local variable"
+;  V03 loc1         [V03,T11] (  2,  1   )     ref  ->  edx         class-hnd exact single-def <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
+;  V04 loc2         [V04,T12] (  2,  1   )     ref  ->  edi         class-hnd exact single-def <Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]>
+;  V05 loc3         [V05,T13] (  2,  1   )     ref  ->  ebx         class-hnd single-def <System.__Canon>
+;  V06 loc4         [V06,T14] (  2,  1   )     ref  ->  [ebp-0x20]  class-hnd spill-single-def <System.__Canon>
+;  V07 loc5         [V07,T06] (  2,  2   )     int  ->  [ebp-0x14]  spill-single-def "spilling helperCall"
+;  V08 tmp1         [V08,T07] (  2,  2   )     int  ->  [ebp-0x18]  spill-single-def "spilling helperCall"
+;  V09 tmp2         [V09,T08] (  2,  2   )     int  ->  [ebp-0x1C]  spill-single-def "spilling helperCall"
+;  V10 tmp3         [V10,T09] (  2,  2   )     int  ->  esi         "spilling helperCall"
+;  V11 tmp4         [V11,T03] (  2,  2   )     ref  ->  edx         single-def "argument with side effect"
+;  V12 tmp5         [V12,T04] (  2,  2   )     ref  ->  edx         single-def "argument with side effect"
+;  V13 tmp6         [V13,T05] (  2,  2   )     ref  ->  edx         single-def "argument with side effect"
+;  V14 cse0         [V14,T10] (  3,  1.50)     ref  ->  edi         "CSE - moderate"
+;  V15 cse1         [V15,T02] (  4,  3   )     ref  ->  edx         "CSE - aggressive"
 ;
-; Lcl frame size = 16
+; Lcl frame size = 20
 
-G_M34217_IG01:        ; bbWeight=1, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, byref, nogc <-- Prolog IG
+G_M34217_IG01:        ; bbWeight=1, gcVars=00000000 {}, gcrefRegs=00000000 {}, byrefRegs=00000000 {}, gcvars, byref, nogc <-- Prolog IG
        push     ebp
        mov      ebp, esp
        push     edi
        push     esi
        push     ebx
-       sub      esp, 16
+       sub      esp, 20
        mov      dword ptr [ebp-0x10], edx
        mov      esi, edx
                        ;; size=14 bbWeight=1 PerfScore 5.75
-G_M34217_IG02:        ; bbWeight=1, gcrefRegs=00000002 {ecx}, byrefRegs=00000000 {}, byref, isz
+G_M34217_IG02:        ; bbWeight=1, gcrefRegs=00000002 {ecx}, byrefRegs=00000000 {}, byref
        ; gcrRegs +[ecx]
-       mov      eax, gword ptr [ecx+0x08]
-       ; gcrRegs +[eax]
-       test     eax, eax
-       je       SHORT G_M34217_IG05
-                       ;; size=7 bbWeight=1 PerfScore 3.25
-G_M34217_IG03:        ; bbWeight=0.50, gcrefRegs=00000003 {eax ecx}, byrefRegs=00000000 {}, byref, isz
-       mov      edi, gword ptr [eax+0x08]
+       mov      edx, gword ptr [ecx+0x08]
+       ; gcrRegs +[edx]
+       test     edx, edx
+       je       G_M34217_IG05
+                       ;; size=11 bbWeight=1 PerfScore 3.25
+G_M34217_IG03:        ; bbWeight=0.50, gcrefRegs=00000006 {ecx edx}, byrefRegs=00000000 {}, byref, isz
+       mov      edi, gword ptr [edx+0x08]
        ; gcrRegs +[edi]
        test     edi, edi
        je       SHORT G_M34217_IG05
-       mov      ebx, gword ptr [eax+0x04]
+       mov      ebx, gword ptr [edx+0x04]
        ; gcrRegs +[ebx]
-       mov      edx, gword ptr [ecx+0x04]
-       ; gcrRegs +[edx]
-       mov      gword ptr [ebp-0x1C], edx
-       ; GC ptr vars +{V06}
-       mov      eax, dword ptr [esi+0x20]
-       ; gcrRegs -[eax]
-       mov      eax, dword ptr [eax+0x08]
-       test     eax, eax
-       je       SHORT G_M34217_IG07
-                       ;; size=26 bbWeight=0.50 PerfScore 6.75
-G_M34217_IG04:        ; bbWeight=0.40, gcVars=00040000 {V06}, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, gcvars, byref, isz
-       ; gcrRegs -[ecx edx]
-       jmp      SHORT G_M34217_IG08
-                       ;; size=2 bbWeight=0.40 PerfScore 0.80
-G_M34217_IG05:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000002 {ecx}, byrefRegs=00000000 {}, gcvars, byref
-       ; gcrRegs -[ebx edi] +[ecx]
-       ; GC ptr vars -{V06}
-       mov      eax, ecx
+       mov      eax, gword ptr [ecx+0x04]
        ; gcrRegs +[eax]
-                       ;; size=2 bbWeight=0.50 PerfScore 0.12
-G_M34217_IG06:        ; bbWeight=0.50, epilog, nogc, extend
-       lea      esp, [ebp-0x0C]
-       pop      ebx
-       pop      esi
-       pop      edi
-       pop      ebp
-       ret      
-                       ;; size=8 bbWeight=0.50 PerfScore 1.75
-G_M34217_IG07:        ; bbWeight=0.10, gcVars=00040000 {V06}, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, gcvars, byref
-       ; gcrRegs -[eax ecx] +[ebx edi]
-       ; GC ptr vars +{V06 V18}
+       mov      gword ptr [ebp-0x20], eax
+       ; GC ptr vars +{V06}
        mov      ecx, esi
+       ; gcrRegs -[ecx]
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
-                       ;; size=12 bbWeight=0.10 PerfScore 0.15
-G_M34217_IG08:        ; bbWeight=0.50, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
+       ; gcrRegs -[edx]
+       call     CORINFO_HELP_MEMCPY
+       ; gcrRegs -[eax]
        mov      dword ptr [ebp-0x14], eax
-       mov      dword ptr [ebp-0x18], eax
-       mov      edx, dword ptr [esi+0x20]
-       cmp      dword ptr [edx+0x04], 12
-       jle      SHORT G_M34217_IG11
-                       ;; size=15 bbWeight=0.50 PerfScore 4.00
-G_M34217_IG09:        ; bbWeight=0.40, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
-       mov      edx, dword ptr [edx+0x0C]
-       test     edx, edx
-       je       SHORT G_M34217_IG11
-                       ;; size=7 bbWeight=0.40 PerfScore 1.30
-G_M34217_IG10:        ; bbWeight=0.32, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref, isz
-       mov      esi, edx
-       jmp      SHORT G_M34217_IG12
-                       ;; size=4 bbWeight=0.32 PerfScore 0.72
-G_M34217_IG11:        ; bbWeight=0.18, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref
        mov      ecx, esi
        mov      edx, 0xD1FFAB1E      ; global ptr
-       call     CORINFO_HELP_RUNTIMEHANDLE_METHOD
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x18], eax
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
+       mov      dword ptr [ebp-0x1C], eax
+       mov      ecx, esi
+       mov      edx, 0xD1FFAB1E      ; global ptr
+       call     CORINFO_HELP_MEMCPY
        mov      esi, eax
-                      ;; size=14 bbWeight=0.18 PerfScore 0.32
-G_M34217_IG12:        ; bbWeight=0.50, gcrefRegs=00000088 {ebx edi}, byrefRegs=00000000 {}, byref
        mov      ecx, dword ptr [ebp-0x14]
        call     [Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]:get_Empty():Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]]
        ; gcrRegs +[eax]
        mov      edx, eax
        ; gcrRegs +[edx]
        push     dword ptr [ebp-0x18]
-       mov      ecx, gword ptr [ebp-0x1C]
+       mov      ecx, gword ptr [ebp-0x20]
        ; gcrRegs +[ecx]
-       ; GC ptr vars -{V06 V18}
+       ; GC ptr vars -{V06}
        call     [Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]:Cons(System.__Canon,Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]]
        ; gcrRegs -[ecx edx]
        mov      edx, eax
        ; gcrRegs +[edx]
-       push     dword ptr [ebp-0x18]
+       push     dword ptr [ebp-0x1C]
        mov      ecx, ebx
        ; gcrRegs +[ecx]
        call     [Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]:Cons(System.__Canon,Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]]
@@ -138,8 +98,21 @@ G_M34217_IG12:        ; bbWeight=0.50, gcrefRegs=00000088 {ebx edi}, byrefRegs=0
        ; gcrRegs +[ecx]
        call     [Microsoft.FSharp.Primitives.Basics.List:revAcc[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]]
        ; gcrRegs -[ecx edx edi]
-                      ;; size=47 bbWeight=0.50 PerfScore 9.12
-G_M34217_IG13:        ; bbWeight=0.50, epilog, nogc, extend
+                      ;; size=122 bbWeight=0.50 PerfScore 17.88
+G_M34217_IG04:        ; bbWeight=0.50, epilog, nogc, extend
+       lea      esp, [ebp-0x0C]
+       pop      ebx
+       pop      esi
+       pop      edi
+       pop      ebp
+       ret      
+                       ;; size=8 bbWeight=0.50 PerfScore 1.75
+G_M34217_IG05:        ; bbWeight=0.50, gcVars=00000000 {}, gcrefRegs=00000002 {ecx}, byrefRegs=00000000 {}, gcvars, byref
+       ; gcrRegs -[eax] +[ecx]
+       mov      eax, ecx
+       ; gcrRegs +[eax]
+                       ;; size=2 bbWeight=0.50 PerfScore 0.12
+G_M34217_IG06:        ; bbWeight=0.50, epilog, nogc, extend
        lea      esp, [ebp-0x0C]
        pop      ebx
        pop      esi
@@ -148,6 +121,6 @@ G_M34217_IG13:        ; bbWeight=0.50, epilog, nogc, extend
        ret      
                        ;; size=8 bbWeight=0.50 PerfScore 1.75
 
-; Total bytes of code 166, prolog size 12, PerfScore 35.79, instruction count 66, allocated bytes for code 166 (MethodHash=43567a56) for method Microsoft.FSharp.Primitives.Basics.List:rev[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
+; Total bytes of code 165, prolog size 12, PerfScore 30.50, instruction count 60, allocated bytes for code 165 (MethodHash=43567a56) for method Microsoft.FSharp.Primitives.Basics.List:rev[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
 ; ============================================================

Details

Improvements/regressions per collection

Collection Contexts with diffs Improvements Regressions Same size Improvements (bytes) Regressions (bytes)
benchmarks.run.windows.x86.checked.mch 88 82 3 3 -3,301 +193
benchmarks.run_pgo.windows.x86.checked.mch 280 278 2 0 -9,151 +187
benchmarks.run_tiered.windows.x86.checked.mch 179 179 0 0 -9,977 +0
coreclr_tests.run.windows.x86.checked.mch 1 1 0 0 -42 +0
libraries.crossgen2.windows.x86.checked.mch 0 0 0 0 -0 +0
libraries.pmi.windows.x86.checked.mch 202 195 7 0 -4,087 +593
libraries_tests.run.windows.x86.Release.mch 258 252 4 2 -15,807 +40
librariestestsnotieredcompilation.run.windows.x86.Release.mch 124 112 10 2 -5,425 +118
realworld.run.windows.x86.checked.mch 153 152 1 0 -5,720 +71
1,285 1,251 27 7 -53,510 +1,202

Context information

Collection Diffed contexts MinOpts FullOpts Missed, base Missed, diff
benchmarks.run.windows.x86.checked.mch 2,914 2 2,912 375 (4.69%) 4,683 (58.58%)
benchmarks.run_pgo.windows.x86.checked.mch 8,126 5,693 2,433 416 (2.71%) 6,829 (44.49%)
benchmarks.run_tiered.windows.x86.checked.mch 8,985 6,348 2,637 202 (1.33%) 5,858 (38.44%)
coreclr_tests.run.windows.x86.checked.mch 305 3 302 132 (2.01%) 5,859 (89.31%)
libraries.crossgen2.windows.x86.checked.mch 8,137 10 8,127 0 (0.00%) 2,977 (25.86%)
libraries.pmi.windows.x86.checked.mch 11,341 0 11,341 335 (1.63%) 8,868 (43.04%)
libraries_tests.run.windows.x86.Release.mch 6,272 5,436 836 200 (1.52%) 6,487 (49.31%)
librariestestsnotieredcompilation.run.windows.x86.Release.mch 3,429 0 3,429 661 (6.92%) 5,728 (59.96%)
realworld.run.windows.x86.checked.mch 3,983 0 3,983 1,189 (7.83%) 10,805 (71.16%)
53,492 17,492 36,000 3,510 (3.05%) 58,094 (50.45%)

jit-analyze output

benchmarks.run.windows.x86.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 298081 (overridden on cmd)
Total bytes of diff: 294973 (overridden on cmd)
Total bytes of delta: -3108 (-1.04 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
         178 : 7633.dasm (59.53 % of base)
           9 : 6254.dasm (1.56 % of base)
           6 : 6009.dasm (2.76 % of base)

Top file improvements (bytes):
        -388 : 6416.dasm (-28.20 % of base)
        -247 : 1964.dasm (-29.55 % of base)
        -157 : 236.dasm (-35.52 % of base)
        -147 : 238.dasm (-29.82 % of base)
        -142 : 579.dasm (-36.60 % of base)
        -107 : 4463.dasm (-37.41 % of base)
         -99 : 462.dasm (-21.85 % of base)
         -93 : 201.dasm (-28.01 % of base)
         -77 : 2686.dasm (-29.28 % of base)
         -77 : 4350.dasm (-27.30 % of base)
         -64 : 4953.dasm (-26.78 % of base)
         -60 : 6234.dasm (-23.62 % of base)
         -56 : 232.dasm (-29.02 % of base)
         -56 : 3912.dasm (-29.02 % of base)
         -56 : 4952.dasm (-28.72 % of base)
         -52 : 1503.dasm (-30.06 % of base)
         -52 : 2865.dasm (-29.38 % of base)
         -48 : 8047.dasm (-25.81 % of base)
         -48 : 2228.dasm (-26.52 % of base)
         -43 : 2801.dasm (-20.00 % of base)

61 total files with Code Size differences (58 improved, 3 regressed), 3 unchanged.

Top method regressions (bytes):
         178 (59.53 % of base) : 7633.dasm - Benchstone.BenchF.Trap:Test():ubyte:this (FullOpts)
           9 (1.56 % of base) : 6254.dasm - System.Collections.Perf_FrozenDictionary_String:ToImmutableDictionary():System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]:this (FullOpts)
           6 (2.76 % of base) : 6009.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)

Top method improvements (bytes):
        -388 (-28.20 % of base) : 6416.dasm - System.SpanHelpers:SequenceEqual[System.__Canon](byref,byref,int):ubyte (FullOpts)
        -247 (-29.55 % of base) : 1964.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -157 (-35.52 % of base) : 236.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -147 (-29.82 % of base) : 238.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -142 (-36.60 % of base) : 579.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -107 (-37.41 % of base) : 4463.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -99 (-21.85 % of base) : 462.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -93 (-28.01 % of base) : 201.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (FullOpts)
         -77 (-27.30 % of base) : 4350.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.IEnumerable,byref):ubyte (FullOpts)
         -77 (-29.28 % of base) : 2686.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (FullOpts)
         -64 (-26.78 % of base) : 4953.dasm - ProtoBuf.ProtoReader+State:ReadAsRoot[System.__Canon](System.__Canon,ProtoBuf.Serializers.ISerializer`1[System.__Canon]):System.__Canon:this (FullOpts)
         -60 (-23.62 % of base) : 6234.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]] (FullOpts)
         -56 (-28.72 % of base) : 4952.dasm - ProtoBuf.ProtoReader+State:DeserializeRoot[System.__Canon](System.__Canon,ProtoBuf.Serializers.ISerializer`1[System.__Canon]):System.__Canon:this (FullOpts)
         -56 (-29.02 % of base) : 3912.dasm - System.Linq.Enumerable:Select[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`3[System.__Canon,int,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -56 (-29.02 % of base) : 232.dasm - System.Linq.Enumerable:SkipWhile[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -52 (-29.38 % of base) : 2865.dasm - System.Linq.Enumerable:Take[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -52 (-30.06 % of base) : 1503.dasm - System.Linq.Enumerable:ToList[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.List`1[System.__Canon] (FullOpts)
         -48 (-25.81 % of base) : 8047.dasm - Newtonsoft.Json.Serialization.JsonTypeReflector:GetAttribute[System.__Canon](System.Object):System.__Canon (FullOpts)
         -48 (-26.52 % of base) : 2228.dasm - System.Text.Json.Serialization.Metadata.JsonMetadataServices:GetConverter[System.__Canon](System.Text.Json.Serialization.Metadata.JsonObjectInfoValues`1[System.__Canon]):System.Text.Json.Serialization.JsonConverter`1[System.__Canon] (FullOpts)
         -43 (-20.00 % of base) : 2801.dasm - System.Array:Sort[System.__Canon](System.__Canon[],int,int,System.Collections.Generic.IComparer`1[System.__Canon]) (FullOpts)

Top method regressions (percentages):
         178 (59.53 % of base) : 7633.dasm - Benchstone.BenchF.Trap:Test():ubyte:this (FullOpts)
           6 (2.76 % of base) : 6009.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.ValueTuple`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`2[System.__Canon,System.__Canon]]):System.ValueTuple`2[System.__Canon,System.__Canon][] (FullOpts)
           9 (1.56 % of base) : 6254.dasm - System.Collections.Perf_FrozenDictionary_String:ToImmutableDictionary():System.Collections.Immutable.ImmutableDictionary`2[System.String,System.String]:this (FullOpts)

Top method improvements (percentages):
        -107 (-37.41 % of base) : 4463.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
        -142 (-36.60 % of base) : 579.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -157 (-35.52 % of base) : 236.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -32 (-34.41 % of base) : 3570.dasm - System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (FullOpts)
         -32 (-32.00 % of base) : 4688.dasm - ProtoBuf.Meta.RuntimeTypeModel:GetSerializer[System.__Canon]():ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (FullOpts)
         -52 (-30.06 % of base) : 1503.dasm - System.Linq.Enumerable:ToList[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.List`1[System.__Canon] (FullOpts)
        -147 (-29.82 % of base) : 238.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -247 (-29.55 % of base) : 1964.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
         -52 (-29.38 % of base) : 2865.dasm - System.Linq.Enumerable:Take[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -77 (-29.28 % of base) : 2686.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (FullOpts)
         -56 (-29.02 % of base) : 3912.dasm - System.Linq.Enumerable:Select[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`3[System.__Canon,int,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -56 (-29.02 % of base) : 232.dasm - System.Linq.Enumerable:SkipWhile[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -56 (-28.72 % of base) : 4952.dasm - ProtoBuf.ProtoReader+State:DeserializeRoot[System.__Canon](System.__Canon,ProtoBuf.Serializers.ISerializer`1[System.__Canon]):System.__Canon:this (FullOpts)
         -30 (-28.57 % of base) : 1506.dasm - System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (FullOpts)
         -30 (-28.57 % of base) : 3204.dasm - System.Text.Json.JsonSerializer:Deserialize[System.__Canon](byref,System.Text.Json.JsonSerializerOptions):System.__Canon (FullOpts)
         -30 (-28.30 % of base) : 3179.dasm - System.Text.Json.JsonSerializer:Deserialize[System.__Canon](System.ReadOnlySpan`1[ubyte],System.Text.Json.JsonSerializerOptions):System.__Canon (FullOpts)
        -388 (-28.20 % of base) : 6416.dasm - System.SpanHelpers:SequenceEqual[System.__Canon](byref,byref,int):ubyte (FullOpts)
         -30 (-28.04 % of base) : 5358.dasm - System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[System.__Canon]:AwaitUnsafeOnCompleted[System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[System.__Canon],System.Threading.Tasks.TaskCompletionSourceWithCancellation`1+<WaitWithCancellationAsync>d__1[System.__Canon]](byref,byref,byref) (FullOpts)
         -93 (-28.01 % of base) : 201.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (FullOpts)
         -30 (-27.52 % of base) : 3172.dasm - System.Text.Json.JsonSerializer:Serialize[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):System.String (FullOpts)

benchmarks.run_pgo.windows.x86.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 726262 (overridden on cmd)
Total bytes of diff: 717298 (overridden on cmd)
Total bytes of delta: -8964 (-1.23 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
         178 : 14139.dasm (59.53 % of base)
           9 : 4813.dasm (2.82 % of base)

Top file improvements (bytes):
        -300 : 594.dasm (-45.52 % of base)
        -296 : 849.dasm (-46.98 % of base)
        -258 : 1543.dasm (-38.62 % of base)
        -258 : 599.dasm (-36.24 % of base)
        -247 : 8074.dasm (-29.51 % of base)
        -216 : 5077.dasm (-40.45 % of base)
        -204 : 7247.dasm (-41.98 % of base)
        -182 : 1325.dasm (-27.58 % of base)
        -158 : 7951.dasm (-31.10 % of base)
        -148 : 14065.dasm (-35.92 % of base)
        -142 : 4536.dasm (-36.22 % of base)
        -140 : 13499.dasm (-34.83 % of base)
        -140 : 13868.dasm (-26.72 % of base)
        -140 : 521.dasm (-31.96 % of base)
        -140 : 7427.dasm (-33.18 % of base)
        -140 : 7568.dasm (-35.90 % of base)
        -128 : 1623.dasm (-33.68 % of base)
        -106 : 3277.dasm (-29.44 % of base)
        -106 : 5076.dasm (-41.09 % of base)
        -102 : 1625.dasm (-39.84 % of base)

71 total files with Code Size differences (69 improved, 2 regressed), 0 unchanged.

Top method regressions (bytes):
         178 (59.53 % of base) : 14139.dasm - Benchstone.BenchF.Trap:Test():ubyte:this (Tier0-FullOpts)
           9 (2.82 % of base) : 4813.dasm - Jil.Common.ExtensionMethods+<>c__DisplayClass65_0:<GetContainerInterface>b__0(System.Type):ubyte:this (Tier1)

Top method improvements (bytes):
        -300 (-45.52 % of base) : 594.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -296 (-46.98 % of base) : 849.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -258 (-36.24 % of base) : 599.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -258 (-38.62 % of base) : 1543.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -247 (-29.51 % of base) : 8074.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -216 (-40.45 % of base) : 5077.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -204 (-41.98 % of base) : 7247.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -182 (-27.58 % of base) : 1325.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -158 (-31.10 % of base) : 7951.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier1)
        -148 (-35.92 % of base) : 14065.dasm - ProtoBuf.ProtoReader+State:ReadAsRoot[System.__Canon](System.__Canon,ProtoBuf.Serializers.ISerializer`1[System.__Canon]):System.__Canon:this (Tier0)
        -142 (-36.22 % of base) : 4536.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -140 (-26.72 % of base) : 13868.dasm - System.Array:Sort[int,System.__Canon](int[],System.__Canon[],int,int,System.Collections.Generic.IComparer`1[int]) (Tier0)
        -140 (-33.18 % of base) : 7427.dasm - System.Array:Sort[System.__Canon](System.__Canon[],int,int,System.Collections.Generic.IComparer`1[System.__Canon]) (Tier0)
        -140 (-34.83 % of base) : 13499.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.IEnumerable,byref):ubyte (Tier0)
        -140 (-35.90 % of base) : 7568.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -140 (-31.96 % of base) : 521.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (Tier0)
        -128 (-33.68 % of base) : 1623.dasm - System.Linq.Enumerable:Concat[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -106 (-29.44 % of base) : 3277.dasm - System.Array:IndexOf[System.__Canon](System.__Canon[],System.__Canon,int,int):int (Tier0)
        -106 (-41.09 % of base) : 5076.dasm - System.Linq.Enumerable:Take[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-42.15 % of base) : 4259.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon):ubyte (Tier0)

Top method regressions (percentages):
         178 (59.53 % of base) : 14139.dasm - Benchstone.BenchF.Trap:Test():ubyte:this (Tier0-FullOpts)
           9 (2.82 % of base) : 4813.dasm - Jil.Common.ExtensionMethods+<>c__DisplayClass65_0:<GetContainerInterface>b__0(System.Type):ubyte:this (Tier1)

Top method improvements (percentages):
        -296 (-46.98 % of base) : 849.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
         -64 (-46.72 % of base) : 5146.dasm - System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (Instrumented Tier0)
         -64 (-46.72 % of base) : 3560.dasm - System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (Tier0)
        -300 (-45.52 % of base) : 594.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -64 (-42.95 % of base) : 13696.dasm - ProtoBuf.Meta.RuntimeTypeModel:GetSerializer[System.__Canon]():ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (Tier0)
         -64 (-42.67 % of base) : 4466.dasm - System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (Instrumented Tier0)
         -64 (-42.67 % of base) : 2738.dasm - System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (Tier0)
        -102 (-42.15 % of base) : 4259.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon):ubyte (Tier0)
        -204 (-41.98 % of base) : 7247.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
         -64 (-41.29 % of base) : 11454.dasm - System.Text.Json.JsonSerializer:Deserialize[System.__Canon](byref,System.Text.Json.JsonSerializerOptions):System.__Canon (Tier0)
         -64 (-41.29 % of base) : 8804.dasm - System.Text.Json.JsonSerializer:Serialize[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):System.String (Tier0)
        -106 (-41.09 % of base) : 5076.dasm - System.Linq.Enumerable:Take[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -216 (-40.45 % of base) : 5077.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-40.16 % of base) : 4967.dasm - System.Linq.Enumerable:Select[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`3[System.__Canon,int,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-40.16 % of base) : 589.dasm - System.Linq.Enumerable:SkipWhile[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-39.84 % of base) : 1625.dasm - System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-39.08 % of base) : 2736.dasm - System.Linq.Enumerable:ToList[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.List`1[System.__Canon] (Tier0)
        -258 (-38.62 % of base) : 1543.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -64 (-38.10 % of base) : 8687.dasm - System.Collections.Immutable.SecurePooledObject`1[System.__Canon]:Use[System.Collections.Immutable.SortedInt32KeyNode`1+Enumerator[System.Collections.Immutable.ImmutableDictionary`2+HashBucket[System.__Canon,System.__Canon]]](byref):System.__Canon:this (Tier0)
         -64 (-37.87 % of base) : 10142.dasm - System.Text.Json.JsonSerializer:Deserialize[System.__Canon](System.ReadOnlySpan`1[ubyte],System.Text.Json.JsonSerializerOptions):System.__Canon (Tier0)

benchmarks.run_tiered.windows.x86.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 706843 (overridden on cmd)
Total bytes of diff: 696866 (overridden on cmd)
Total bytes of delta: -9977 (-1.41 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file improvements (bytes):
        -388 : 11234.dasm (-28.20 % of base)
        -300 : 567.dasm (-45.52 % of base)
        -296 : 1467.dasm (-46.98 % of base)
        -258 : 1367.dasm (-38.62 % of base)
        -258 : 572.dasm (-36.24 % of base)
        -254 : 8558.dasm (-35.98 % of base)
        -247 : 5431.dasm (-29.55 % of base)
        -228 : 11232.dasm (-43.18 % of base)
        -216 : 7383.dasm (-40.45 % of base)
        -216 : 7816.dasm (-38.78 % of base)
        -204 : 9375.dasm (-41.98 % of base)
        -182 : 1211.dasm (-27.53 % of base)
        -178 : 8617.dasm (-43.20 % of base)
        -157 : 10961.dasm (-35.52 % of base)
        -148 : 9283.dasm (-35.92 % of base)
        -147 : 10314.dasm (-29.82 % of base)
        -142 : 3374.dasm (-36.60 % of base)
        -140 : 10586.dasm (-33.18 % of base)
        -140 : 498.dasm (-31.96 % of base)
        -140 : 7781.dasm (-34.83 % of base)

86 total files with Code Size differences (86 improved, 0 regressed), 0 unchanged.

Top method improvements (bytes):
        -388 (-28.20 % of base) : 11234.dasm - System.SpanHelpers:SequenceEqual[System.__Canon](byref,byref,int):ubyte (Tier0-FullOpts)
        -300 (-45.52 % of base) : 567.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -296 (-46.98 % of base) : 1467.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -258 (-36.24 % of base) : 572.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -258 (-38.62 % of base) : 1367.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -254 (-35.98 % of base) : 8558.dasm - System.Array:Sort[System.__Canon,System.__Canon](System.__Canon[],System.__Canon[],int,int,System.Collections.Generic.IComparer`1[System.__Canon]) (Tier0)
        -247 (-29.55 % of base) : 5431.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -228 (-43.18 % of base) : 11232.dasm - System.MemoryExtensions:SequenceEqual[System.__Canon](System.Span`1[System.__Canon],System.ReadOnlySpan`1[System.__Canon]):ubyte (Tier0)
        -216 (-40.45 % of base) : 7383.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -216 (-38.78 % of base) : 7816.dasm - System.Threading.Tasks.Parallel:ForEachWorker[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Threading.Tasks.ParallelOptions,System.Action`1[System.__Canon],System.Action`2[System.__Canon,System.__Canon],System.Action`3[System.__Canon,System.__Canon,long],System.Func`4[System.__Canon,System.__Canon,System.__Canon,System.__Canon],System.Func`5[System.__Canon,System.__Canon,long,System.__Canon,System.__Canon],System.Func`1[System.__Canon],System.Action`1[System.__Canon]):System.Threading.Tasks.ParallelLoopResult (Tier0)
        -204 (-41.98 % of base) : 9375.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -182 (-27.53 % of base) : 1211.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -178 (-43.20 % of base) : 8617.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]] (Tier0)
        -157 (-35.52 % of base) : 10961.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier1)
        -148 (-35.92 % of base) : 9283.dasm - ProtoBuf.ProtoReader+State:ReadAsRoot[System.__Canon](System.__Canon,ProtoBuf.Serializers.ISerializer`1[System.__Canon]):System.__Canon:this (Tier0)
        -147 (-29.82 % of base) : 10314.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier1)
        -142 (-36.60 % of base) : 3374.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
        -140 (-33.18 % of base) : 10586.dasm - System.Array:Sort[System.__Canon](System.__Canon[],int,int,System.Collections.Generic.IComparer`1[System.__Canon]) (Tier0)
        -140 (-34.83 % of base) : 7781.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.IEnumerable,byref):ubyte (Tier0)
        -140 (-31.96 % of base) : 498.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (Tier0)

Top method improvements (percentages):
        -296 (-46.98 % of base) : 1467.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
         -64 (-46.72 % of base) : 14678.dasm - System.Collections.Generic.EnumerableHelpers:GetEmptyEnumerator[System.__Canon]():System.Collections.Generic.IEnumerator`1[System.__Canon] (Tier0)
        -300 (-45.52 % of base) : 567.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -64 (-43.24 % of base) : 8862.dasm - ProtoBuf.Meta.RuntimeTypeModel:GetSerializer[System.__Canon]():ProtoBuf.Serializers.ISerializer`1[System.__Canon]:this (Tier0)
        -178 (-43.20 % of base) : 8617.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]] (Tier0)
        -228 (-43.18 % of base) : 11232.dasm - System.MemoryExtensions:SequenceEqual[System.__Canon](System.Span`1[System.__Canon],System.ReadOnlySpan`1[System.__Canon]):ubyte (Tier0)
         -64 (-42.67 % of base) : 8239.dasm - System.Linq.Enumerable:SetCountAndGetSpan[System.__Canon](System.Collections.Generic.List`1[System.__Canon],int):System.Span`1[System.__Canon] (Tier0)
        -102 (-42.15 % of base) : 7419.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon):ubyte (Tier0)
        -204 (-41.98 % of base) : 9375.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
         -64 (-41.29 % of base) : 4981.dasm - System.Text.Json.JsonSerializer:Deserialize[System.__Canon](byref,System.Text.Json.JsonSerializerOptions):System.__Canon (Tier0)
         -64 (-41.29 % of base) : 4328.dasm - System.Text.Json.JsonSerializer:Serialize[System.__Canon](System.__Canon,System.Text.Json.JsonSerializerOptions):System.String (Tier0)
        -106 (-41.09 % of base) : 7382.dasm - System.Linq.Enumerable:Take[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -216 (-40.45 % of base) : 7383.dasm - System.Linq.Enumerable:TakeIterator[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-40.16 % of base) : 562.dasm - System.Linq.Enumerable:SkipWhile[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-39.84 % of base) : 1453.dasm - System.Linq.Enumerable:Distinct[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -102 (-39.08 % of base) : 3855.dasm - System.Linq.Enumerable:ToList[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.List`1[System.__Canon] (Tier0)
        -216 (-38.78 % of base) : 7816.dasm - System.Threading.Tasks.Parallel:ForEachWorker[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Threading.Tasks.ParallelOptions,System.Action`1[System.__Canon],System.Action`2[System.__Canon,System.__Canon],System.Action`3[System.__Canon,System.__Canon,long],System.Func`4[System.__Canon,System.__Canon,System.__Canon,System.__Canon],System.Func`5[System.__Canon,System.__Canon,long,System.__Canon,System.__Canon],System.Func`1[System.__Canon],System.Action`1[System.__Canon]):System.Threading.Tasks.ParallelLoopResult (Tier0)
        -258 (-38.62 % of base) : 1367.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -64 (-38.32 % of base) : 8358.dasm - System.Text.Json.Serialization.Metadata.JsonMetadataServices:CreateListInfo[System.__Canon,System.__Canon](System.Text.Json.JsonSerializerOptions,System.Text.Json.Serialization.Metadata.JsonCollectionInfoValues`1[System.__Canon]):System.Text.Json.Serialization.Metadata.JsonTypeInfo`1[System.__Canon] (Tier0)
         -64 (-38.10 % of base) : 5556.dasm - System.Collections.Immutable.SecurePooledObject`1[System.__Canon]:Use[System.Collections.Immutable.SortedInt32KeyNode`1+Enumerator[System.Collections.Immutable.ImmutableDictionary`2+HashBucket[System.__Canon,System.__Canon]]](byref):System.__Canon:this (Tier0)

coreclr_tests.run.windows.x86.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 46161 (overridden on cmd)
Total bytes of diff: 46119 (overridden on cmd)
Total bytes of delta: -42 (-0.09 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file improvements (bytes):
         -42 : 480.dasm (-14.14 % of base)

1 total files with Code Size differences (1 improved, 0 regressed), 0 unchanged.

Top method improvements (bytes):
         -42 (-14.14 % of base) : 480.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte],byref):System.__Canon (FullOpts)

Top method improvements (percentages):
         -42 (-14.14 % of base) : 480.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte],byref):System.__Canon (FullOpts)

1 total methods with Code Size differences (1 improved, 0 regressed).

libraries.pmi.windows.x86.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 1461078 (overridden on cmd)
Total bytes of diff: 1457584 (overridden on cmd)
Total bytes of delta: -3494 (-0.24 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
         475 : 6101.dasm (101.93 % of base)
          36 : 4142.dasm (13.74 % of base)
          31 : 4154.dasm (16.06 % of base)
          24 : 22172.dasm (9.52 % of base)
          13 : 9923.dasm (4.73 % of base)
           8 : 9921.dasm (4.15 % of base)
           6 : 4108.dasm (4.17 % of base)

Top file improvements (bytes):
         -77 : 4104.dasm (-30.92 % of base)
         -77 : 4302.dasm (-30.92 % of base)
         -51 : 11892.dasm (-30.54 % of base)
         -50 : 6167.dasm (-9.86 % of base)
         -47 : 4316.dasm (-25.41 % of base)
         -46 : 4177.dasm (-15.92 % of base)
         -46 : 4216.dasm (-15.92 % of base)
         -46 : 4226.dasm (-15.92 % of base)
         -46 : 4196.dasm (-15.92 % of base)
         -46 : 4206.dasm (-15.92 % of base)
         -45 : 21864.dasm (-22.84 % of base)
         -44 : 3947.dasm (-35.20 % of base)
         -44 : 3951.dasm (-29.14 % of base)
         -43 : 14202.dasm (-29.45 % of base)
         -43 : 14203.dasm (-29.45 % of base)
         -43 : 14206.dasm (-26.87 % of base)
         -43 : 403.dasm (-13.44 % of base)
         -43 : 14201.dasm (-29.86 % of base)
         -43 : 14204.dasm (-29.86 % of base)
         -43 : 14207.dasm (-29.25 % of base)

75 total files with Code Size differences (68 improved, 7 regressed), 0 unchanged.

Top method regressions (bytes):
         475 (101.93 % of base) : 6101.dasm - System.Text.Unicode.TextSegmentationUtility:GetLengthOfFirstExtendedGraphemeCluster[System.__Canon](System.ReadOnlySpan`1[System.__Canon],System.Text.Unicode.TextSegmentationUtility+DecodeFirstRune`1[System.__Canon]):int (FullOpts)
          36 (13.74 % of base) : 4142.dasm - System.Numerics.Vector:ConditionalSelect[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          31 (16.06 % of base) : 4154.dasm - System.Numerics.Vector:CreateSequence[System.__Canon](System.__Canon,System.__Canon):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          24 (9.52 % of base) : 22172.dasm - <StartupCode$FSharp-Core>.$Map:loop@860-43[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],Microsoft.FSharp.Core.Unit):ubyte (FullOpts)
          13 (4.73 % of base) : 9923.dasm - System.Runtime.InteropServices.Marshal:CopyToManaged[System.__Canon](int,System.__Canon[],int,int) (FullOpts)
           8 (4.15 % of base) : 9921.dasm - System.Runtime.InteropServices.Marshal:CopyToNative[System.__Canon](System.__Canon[],int,int,int) (FullOpts)
           6 (4.17 % of base) : 4108.dasm - System.Numerics.Vector:AndNot[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)

Top method improvements (bytes):
         -77 (-30.92 % of base) : 4104.dasm - System.Numerics.Vector:Abs[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -77 (-30.92 % of base) : 4302.dasm - System.Numerics.Vector:SquareRoot[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -51 (-30.54 % of base) : 11892.dasm - System.Collections.Generic.CollectionExtensions:Remove[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IDictionary`2[System.__Canon,System.Nullable`1[int]],System.__Canon,byref):ubyte (FullOpts)
         -50 (-9.86 % of base) : 6167.dasm - System.Text.Unicode.Utf8+TryWriteInterpolatedStringHandler:<AppendEnum>g__GrowAndAppendFormatted|21_0[System.__Canon](byref,System.__Canon,int,byref,System.String):ubyte (FullOpts)
         -47 (-25.41 % of base) : 4316.dasm - System.Numerics.Vector:Sum[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.__Canon (FullOpts)
         -46 (-15.92 % of base) : 4177.dasm - System.Numerics.Vector:Equals[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -46 (-15.92 % of base) : 4196.dasm - System.Numerics.Vector:GreaterThan[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -46 (-15.92 % of base) : 4206.dasm - System.Numerics.Vector:GreaterThanOrEqual[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -46 (-15.92 % of base) : 4216.dasm - System.Numerics.Vector:LessThan[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -46 (-15.92 % of base) : 4226.dasm - System.Numerics.Vector:LessThanOrEqual[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -45 (-22.84 % of base) : 21864.dasm - <StartupCode$FSharp-Core>.$Set:loop@895-46[System.__Canon](System.Collections.Generic.IEnumerator`1[System.__Canon],System.Collections.Generic.IEnumerator`1[System.__Canon],Microsoft.FSharp.Core.Unit):ubyte (FullOpts)
         -44 (-35.20 % of base) : 3947.dasm - System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]:GetHashCode():int:this (FullOpts)
         -44 (-29.14 % of base) : 3951.dasm - System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]:System.IValueTupleInternal.ToStringEnd():System.String:this (FullOpts)
         -43 (-29.86 % of base) : 14324.dasm - Microsoft.FSharp.Collections.FSharpMap`2[int,System.Nullable`1[int]]:FoldSection[System.__Canon](int,int,Microsoft.FSharp.Core.FSharpFunc`2[int,System.__Canon],System.__Canon):System.__Canon:this (FullOpts)
         -43 (-24.86 % of base) : 14205.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[double](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],double):double:this (FullOpts)
         -43 (-29.86 % of base) : 14204.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[int](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],int):int:this (FullOpts)
         -43 (-29.25 % of base) : 14207.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[long](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],long):long:this (FullOpts)
         -43 (-29.45 % of base) : 14203.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[short](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],short):short:this (FullOpts)
         -43 (-29.86 % of base) : 14201.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[System.__Canon](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon):System.__Canon:this (FullOpts)
         -43 (-26.87 % of base) : 14206.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[System.Numerics.Vector`1[float]](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.Numerics.Vector`1[float]):System.Numerics.Vector`1[float]:this (FullOpts)

Top method regressions (percentages):
         475 (101.93 % of base) : 6101.dasm - System.Text.Unicode.TextSegmentationUtility:GetLengthOfFirstExtendedGraphemeCluster[System.__Canon](System.ReadOnlySpan`1[System.__Canon],System.Text.Unicode.TextSegmentationUtility+DecodeFirstRune`1[System.__Canon]):int (FullOpts)
          31 (16.06 % of base) : 4154.dasm - System.Numerics.Vector:CreateSequence[System.__Canon](System.__Canon,System.__Canon):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          36 (13.74 % of base) : 4142.dasm - System.Numerics.Vector:ConditionalSelect[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
          24 (9.52 % of base) : 22172.dasm - <StartupCode$FSharp-Core>.$Map:loop@860-43[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],System.Collections.Generic.IEnumerator`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.Nullable`1[int]]],Microsoft.FSharp.Core.Unit):ubyte (FullOpts)
          13 (4.73 % of base) : 9923.dasm - System.Runtime.InteropServices.Marshal:CopyToManaged[System.__Canon](int,System.__Canon[],int,int) (FullOpts)
           6 (4.17 % of base) : 4108.dasm - System.Numerics.Vector:AndNot[System.__Canon](System.Numerics.Vector`1[System.__Canon],System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
           8 (4.15 % of base) : 9921.dasm - System.Runtime.InteropServices.Marshal:CopyToNative[System.__Canon](System.__Canon[],int,int,int) (FullOpts)

Top method improvements (percentages):
         -32 (-57.14 % of base) : 4146.dasm - System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector`1[long]):System.Numerics.Vector`1[double] (FullOpts)
         -32 (-57.14 % of base) : 4147.dasm - System.Numerics.Vector:ConvertToDouble(System.Numerics.Vector`1[ulong]):System.Numerics.Vector`1[double] (FullOpts)
         -26 (-39.39 % of base) : 3563.dasm - System.TupleExtensions:ToTuple[System.__Canon,System.Nullable`1[int]](System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]):System.Tuple`2[System.__Canon,System.Nullable`1[int]] (FullOpts)
         -44 (-35.20 % of base) : 3947.dasm - System.ValueTuple`2[System.__Canon,System.Nullable`1[int]]:GetHashCode():int:this (FullOpts)
         -30 (-33.33 % of base) : 4323.dasm - System.Numerics.Vector:ToScalar[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.__Canon (FullOpts)
         -32 (-32.32 % of base) : 19741.dasm - Microsoft.FSharp.Quotations.PatternsModule:|FrontAndBack|_|[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Core.FSharpOption`1[System.__Canon] (FullOpts)
         -30 (-32.26 % of base) : 15535.dasm - Microsoft.FSharp.Control.TaskBuilderBase:Zero[System.__Canon]():Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[Microsoft.FSharp.Control.TaskStateMachineData`1[System.__Canon],System.__Canon]:this (FullOpts)
         -30 (-32.26 % of base) : 19493.dasm - Microsoft.FSharp.Core.CompilerServices.ResumableCode:Yield[System.__Canon]():Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[System.__Canon,System.__Canon] (FullOpts)
         -30 (-32.26 % of base) : 19463.dasm - Microsoft.FSharp.Core.CompilerServices.ResumableCode:Zero[System.__Canon]():Microsoft.FSharp.Core.CompilerServices.ResumableCode`2[System.__Canon,System.__Canon] (FullOpts)
         -77 (-30.92 % of base) : 4104.dasm - System.Numerics.Vector:Abs[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -77 (-30.92 % of base) : 4302.dasm - System.Numerics.Vector:SquareRoot[System.__Canon](System.Numerics.Vector`1[System.__Canon]):System.Numerics.Vector`1[System.__Canon] (FullOpts)
         -51 (-30.54 % of base) : 11892.dasm - System.Collections.Generic.CollectionExtensions:Remove[System.__Canon,System.Nullable`1[int]](System.Collections.Generic.IDictionary`2[System.__Canon,System.Nullable`1[int]],System.__Canon,byref):ubyte (FullOpts)
         -30 (-30.00 % of base) : 15870.dasm - Microsoft.FSharp.Core.ExtraTopLevelOperators:getArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
         -43 (-29.86 % of base) : 14324.dasm - Microsoft.FSharp.Collections.FSharpMap`2[int,System.Nullable`1[int]]:FoldSection[System.__Canon](int,int,Microsoft.FSharp.Core.FSharpFunc`2[int,System.__Canon],System.__Canon):System.__Canon:this (FullOpts)
         -43 (-29.86 % of base) : 14204.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[int](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],int):int:this (FullOpts)
         -43 (-29.86 % of base) : 14201.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[System.__Canon](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon):System.__Canon:this (FullOpts)
         -43 (-29.45 % of base) : 14203.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[short](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],short):short:this (FullOpts)
         -43 (-29.45 % of base) : 14202.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[ubyte](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],ubyte):ubyte:this (FullOpts)
         -43 (-29.25 % of base) : 14207.dasm - Microsoft.FSharp.Collections.FSharpMap`2[System.__Canon,System.Nullable`1[int]]:FoldSection[long](System.__Canon,System.__Canon,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],long):long:this (FullOpts)
         -43 (-29.25 % of base) : 14263.dasm - Microsoft.FSharp.Collections.FSharpMap`2[ubyte,System.Nullable`1[int]]:FoldSection[System.__Canon](ubyte,ubyte,Microsoft.FSharp.Core.FSharpFunc`2[ubyte,System.__Canon],System.__Canon):System.__Canon:this (FullOpts)

libraries_tests.run.windows.x86.Release.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 510379 (overridden on cmd)
Total bytes of diff: 494612 (overridden on cmd)
Total bytes of delta: -15767 (-3.09 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          17 : 3931.dasm (7.94 % of base)
          11 : 8479.dasm (5.24 % of base)
           6 : 3549.dasm (2.84 % of base)
           6 : 7105.dasm (2.75 % of base)

Top file improvements (bytes):
        -300 : 32.dasm (-45.45 % of base)
        -300 : 4404.dasm (-45.45 % of base)
        -296 : 38.dasm (-46.84 % of base)
        -296 : 4409.dasm (-46.84 % of base)
        -288 : 2170.dasm (-31.14 % of base)
        -288 : 6486.dasm (-31.14 % of base)
        -258 : 155.dasm (-38.62 % of base)
        -258 : 1279.dasm (-36.34 % of base)
        -258 : 4527.dasm (-38.62 % of base)
        -258 : 5645.dasm (-36.34 % of base)
        -247 : 8911.dasm (-29.98 % of base)
        -241 : 4533.dasm (-44.14 % of base)
        -241 : 4911.dasm (-44.14 % of base)
        -241 : 535.dasm (-44.46 % of base)
        -241 : 161.dasm (-44.46 % of base)
        -224 : 9942.dasm (-19.44 % of base)
        -204 : 1944.dasm (-41.98 % of base)
        -204 : 6256.dasm (-41.98 % of base)
        -182 : 5674.dasm (-27.58 % of base)
        -182 : 1308.dasm (-27.58 % of base)

76 total files with Code Size differences (72 improved, 4 regressed), 2 unchanged.

Top method regressions (bytes):
          17 (7.94 % of base) : 3931.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
          11 (5.24 % of base) : 8479.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
           6 (2.84 % of base) : 3549.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
           6 (2.75 % of base) : 7105.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)

Top method improvements (bytes):
        -300 (-45.45 % of base) : 32.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -300 (-45.45 % of base) : 4404.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -296 (-46.84 % of base) : 38.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -296 (-46.84 % of base) : 4409.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -288 (-31.14 % of base) : 2170.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -288 (-31.14 % of base) : 6486.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -258 (-36.34 % of base) : 1279.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -258 (-36.34 % of base) : 5645.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -258 (-38.62 % of base) : 155.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -258 (-38.62 % of base) : 4527.dasm - System.Linq.Enumerable:Where[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -247 (-29.98 % of base) : 8911.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (Tier0-FullOpts)
        -241 (-44.14 % of base) : 4911.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Instrumented Tier0)
        -241 (-44.46 % of base) : 535.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Instrumented Tier0)
        -241 (-44.14 % of base) : 4533.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -241 (-44.46 % of base) : 161.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -224 (-19.44 % of base) : 9942.dasm - System.Linq.Enumerable:SequenceEqual[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):ubyte (Tier0-FullOpts)
        -204 (-41.98 % of base) : 1944.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -204 (-41.98 % of base) : 6256.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (Tier0)
        -182 (-27.58 % of base) : 5674.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)
        -182 (-27.58 % of base) : 1308.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (Tier0)

Top method regressions (percentages):
          17 (7.94 % of base) : 3931.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
          11 (5.24 % of base) : 8479.dasm - System.Collections.Hashtable:KeyEquals(System.Object,System.Object):ubyte:this (Tier1)
           6 (2.84 % of base) : 3549.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)
           6 (2.75 % of base) : 7105.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier1)

Top method improvements (percentages):
        -178 (-47.85 % of base) : 2987.dasm - Xunit.Assert:Contains[System.__Canon](System.__Canon,System.Collections.Generic.IEnumerable`1[System.__Canon]) (Tier0)
        -296 (-46.84 % of base) : 38.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -296 (-46.84 % of base) : 4409.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
        -102 (-46.15 % of base) : 8542.dasm - System.Collections.Immutable.ImmutableHashSet:Create[System.__Canon](System.__Canon[]):System.Collections.Immutable.ImmutableHashSet`1[System.__Canon] (Tier0)
        -300 (-45.45 % of base) : 32.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -300 (-45.45 % of base) : 4404.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -64 (-45.39 % of base) : 11711.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilder[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]] (Instrumented Tier0)
         -64 (-45.39 % of base) : 7140.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilder[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]] (Tier0)
        -102 (-44.74 % of base) : 9595.dasm - Microsoft.CodeAnalysis.PublicContract:ToBoxedImmutableArrayWithDistinctNonNullItems[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.String):System.Collections.Generic.IReadOnlyList`1[System.__Canon] (Tier0)
        -241 (-44.46 % of base) : 535.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Instrumented Tier0)
        -241 (-44.46 % of base) : 161.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
         -64 (-44.44 % of base) : 11462.dasm - System.Linq.ImmutableArrayExtensions:Select[System.__Canon,System.__Canon](System.Collections.Immutable.ImmutableArray`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
         -64 (-44.44 % of base) : 9504.dasm - System.Linq.ImmutableArrayExtensions:Where[System.__Canon](System.Collections.Immutable.ImmutableArray`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (Tier0)
        -241 (-44.14 % of base) : 4911.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Instrumented Tier0)
        -241 (-44.14 % of base) : 4533.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (Tier0)
         -64 (-43.84 % of base) : 7433.dasm - Roslyn.Utilities.EnumerableExtensions:ToImmutableDictionaryOrEmpty[System.__Canon,int](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]):System.Collections.Immutable.ImmutableDictionary`2[System.__Canon,int] (Tier0)
         -64 (-43.54 % of base) : 8185.dasm - Microsoft.VisualStudio.Composition.AttributeServices:GetFirstAttribute[System.__Canon](System.Reflection.ICustomAttributeProvider):System.__Canon (Tier0)
         -64 (-43.54 % of base) : 2949.dasm - Xunit.Assert:Equal[System.__Canon](System.__Canon,System.__Canon) (Tier0)
        -178 (-43.31 % of base) : 7253.dasm - System.Collections.Immutable.ImmutableExtensions:AsOrderedCollection[System.ValueTuple`3[int,int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.ValueTuple`3[int,int,System.__Canon]]):System.Collections.Immutable.IOrderedCollection`1[System.ValueTuple`3[int,int,System.__Canon]] (Tier0)
        -102 (-42.68 % of base) : 11393.dasm - Microsoft.CodeAnalysis.PublicContract:ToBoxedImmutableArrayWithNonNullItems[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.String):System.Collections.Generic.IReadOnlyList`1[System.__Canon] (Tier0)

librariestestsnotieredcompilation.run.windows.x86.Release.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 256268 (overridden on cmd)
Total bytes of diff: 250961 (overridden on cmd)
Total bytes of delta: -5307 (-2.07 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          48 : 7258.dasm (11.29 % of base)
          14 : 4394.dasm (7.69 % of base)
          10 : 4483.dasm (5.29 % of base)
          10 : 7807.dasm (3.00 % of base)
           8 : 7376.dasm (17.02 % of base)
           8 : 7798.dasm (3.86 % of base)
           6 : 2115.dasm (2.84 % of base)
           6 : 69.dasm (2.75 % of base)
           5 : 1485.dasm (7.04 % of base)
           3 : 4130.dasm (1.27 % of base)

Top file improvements (bytes):
        -288 : 2985.dasm (-31.14 % of base)
        -288 : 968.dasm (-31.14 % of base)
        -247 : 4198.dasm (-29.55 % of base)
        -224 : 4556.dasm (-19.44 % of base)
        -157 : 9.dasm (-35.52 % of base)
        -157 : 2055.dasm (-35.52 % of base)
        -151 : 5216.dasm (-26.03 % of base)
        -151 : 735.dasm (-26.03 % of base)
        -147 : 428.dasm (-29.82 % of base)
        -147 : 2494.dasm (-29.82 % of base)
        -142 : 12.dasm (-36.60 % of base)
        -142 : 2058.dasm (-36.60 % of base)
        -135 : 4205.dasm (-21.70 % of base)
        -122 : 4447.dasm (-29.54 % of base)
        -107 : 3296.dasm (-37.41 % of base)
         -99 : 441.dasm (-21.85 % of base)
         -99 : 2507.dasm (-21.85 % of base)
         -97 : 7374.dasm (-21.04 % of base)
         -93 : 594.dasm (-28.27 % of base)
         -93 : 2454.dasm (-28.27 % of base)

63 total files with Code Size differences (53 improved, 10 regressed), 2 unchanged.

Top method regressions (bytes):
          48 (11.29 % of base) : 7258.dasm - Microsoft.CodeAnalysis.BindingDiagnosticBag`1[System.__Canon]:AddDiagnostics[System.__Canon](Microsoft.CodeAnalysis.CompoundUseSiteInfo`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.__Canon):ubyte:this (FullOpts)
          14 (7.69 % of base) : 4394.dasm - System.Collections.Immutable.ImmutableInterlocked:GetOrAdd[System.__Canon,System.__Canon](byref,System.__Canon,System.Func`2[System.__Canon,System.__Canon]):System.__Canon (FullOpts)
          10 (3.00 % of base) : 7807.dasm - Microsoft.CodeAnalysis.CSharp.OverloadResolution:BetterFunctionMember[System.__Canon](Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon],Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon],Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder`1[Microsoft.CodeAnalysis.CSharp.BoundExpression],byref):int:this (FullOpts)
          10 (5.29 % of base) : 4483.dasm - System.Collections.Immutable.ImmutableInterlocked:GetOrAdd[System.__Canon,System.__Canon,System.__Canon](byref,System.__Canon,System.Func`3[System.__Canon,System.__Canon,System.__Canon],System.__Canon):System.__Canon (FullOpts)
           8 (3.86 % of base) : 7798.dasm - Microsoft.CodeAnalysis.CSharp.OverloadResolution:OverloadResolutionResultIsValid[System.__Canon](Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder`1[Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon]],ubyte):ubyte (FullOpts)
           8 (17.02 % of base) : 7376.dasm - System.Collections.Immutable.ImmutableArray`1[System.__Canon]:As[System.__Canon]():System.Collections.Immutable.ImmutableArray`1[System.__Canon]:this (FullOpts)
           6 (2.84 % of base) : 2115.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
           6 (2.75 % of base) : 69.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
           5 (7.04 % of base) : 1485.dasm - Xunit.Sdk.CollectionTrackerExtensions:AsTracker[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):Xunit.Sdk.CollectionTracker`1[System.__Canon] (FullOpts)
           3 (1.27 % of base) : 4130.dasm - System.Linq.OrderedEnumerable`1[System.__Canon]:GetCount(ubyte):int:this (FullOpts)

Top method improvements (bytes):
        -288 (-31.14 % of base) : 2985.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -288 (-31.14 % of base) : 968.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -247 (-29.55 % of base) : 4198.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -224 (-19.44 % of base) : 4556.dasm - System.Linq.Enumerable:SequenceEqual[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEnumerable`1[System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):ubyte (FullOpts)
        -157 (-35.52 % of base) : 9.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -157 (-35.52 % of base) : 2055.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -151 (-26.03 % of base) : 5216.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon,System.Collections.Generic.IEqualityComparer`1[System.__Canon]):ubyte (FullOpts)
        -151 (-26.03 % of base) : 735.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon,System.Collections.Generic.IEqualityComparer`1[System.__Canon]):ubyte (FullOpts)
        -147 (-29.82 % of base) : 428.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -147 (-29.82 % of base) : 2494.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -142 (-36.60 % of base) : 12.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -142 (-36.60 % of base) : 2058.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -135 (-21.70 % of base) : 4205.dasm - Microsoft.VisualStudio.Composition.CompositionConfiguration:PathExistsBetween[System.__Canon](System.__Canon,System.__Canon,System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.HashSet`1[System.__Canon]):System.Collections.Immutable.ImmutableStack`1[System.__Canon] (FullOpts)
        -122 (-29.54 % of base) : 4447.dasm - Microsoft.CodeAnalysis.PublicContract:IndexOfNullOrDuplicateItem[System.__Canon](System.Collections.Generic.IReadOnlyList`1[System.__Canon]):int (FullOpts)
        -107 (-37.41 % of base) : 3296.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -99 (-21.85 % of base) : 441.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -99 (-21.85 % of base) : 2507.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -97 (-21.04 % of base) : 7374.dasm - Microsoft.CodeAnalysis.ImmutableArrayExtensions:GetTypesFromMemberMap[System.ReadOnlyMemory`1[ushort],System.__Canon,System.__Canon](System.Collections.Generic.Dictionary`2[System.ReadOnlyMemory`1[ushort],System.Collections.Immutable.ImmutableArray`1[System.__Canon]],System.Collections.Generic.IEqualityComparer`1[System.ReadOnlyMemory`1[ushort]]):System.Collections.Generic.Dictionary`2[System.ReadOnlyMemory`1[ushort],System.Collections.Immutable.ImmutableArray`1[System.__Canon]] (FullOpts)
         -93 (-28.27 % of base) : 594.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
         -93 (-28.27 % of base) : 2454.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)

Top method regressions (percentages):
           8 (17.02 % of base) : 7376.dasm - System.Collections.Immutable.ImmutableArray`1[System.__Canon]:As[System.__Canon]():System.Collections.Immutable.ImmutableArray`1[System.__Canon]:this (FullOpts)
          48 (11.29 % of base) : 7258.dasm - Microsoft.CodeAnalysis.BindingDiagnosticBag`1[System.__Canon]:AddDiagnostics[System.__Canon](Microsoft.CodeAnalysis.CompoundUseSiteInfo`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.__Canon):ubyte:this (FullOpts)
          14 (7.69 % of base) : 4394.dasm - System.Collections.Immutable.ImmutableInterlocked:GetOrAdd[System.__Canon,System.__Canon](byref,System.__Canon,System.Func`2[System.__Canon,System.__Canon]):System.__Canon (FullOpts)
           5 (7.04 % of base) : 1485.dasm - Xunit.Sdk.CollectionTrackerExtensions:AsTracker[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):Xunit.Sdk.CollectionTracker`1[System.__Canon] (FullOpts)
          10 (5.29 % of base) : 4483.dasm - System.Collections.Immutable.ImmutableInterlocked:GetOrAdd[System.__Canon,System.__Canon,System.__Canon](byref,System.__Canon,System.Func`3[System.__Canon,System.__Canon,System.__Canon],System.__Canon):System.__Canon (FullOpts)
           8 (3.86 % of base) : 7798.dasm - Microsoft.CodeAnalysis.CSharp.OverloadResolution:OverloadResolutionResultIsValid[System.__Canon](Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder`1[Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon]],ubyte):ubyte (FullOpts)
          10 (3.00 % of base) : 7807.dasm - Microsoft.CodeAnalysis.CSharp.OverloadResolution:BetterFunctionMember[System.__Canon](Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon],Microsoft.CodeAnalysis.CSharp.MemberResolutionResult`1[System.__Canon],Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder`1[Microsoft.CodeAnalysis.CSharp.BoundExpression],byref):int:this (FullOpts)
           6 (2.84 % of base) : 2115.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
           6 (2.75 % of base) : 69.dasm - System.Linq.Enumerable:<ToArray>g__EnumerableToArray|296_0[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
           3 (1.27 % of base) : 4130.dasm - System.Linq.OrderedEnumerable`1[System.__Canon]:GetCount(ubyte):int:this (FullOpts)

Top method improvements (percentages):
        -107 (-37.41 % of base) : 3296.dasm - System.Linq.Enumerable:TryGetSpan[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):ubyte (FullOpts)
        -142 (-36.60 % of base) : 12.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -142 (-36.60 % of base) : 2058.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -157 (-35.52 % of base) : 9.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -157 (-35.52 % of base) : 2055.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -64 (-35.36 % of base) : 9910.dasm - System.Linq.Enumerable:Contains[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.__Canon):ubyte (FullOpts)
         -14 (-32.56 % of base) : 3256.dasm - System.Linq.Enumerable:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -42 (-32.06 % of base) : 5298.dasm - Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxListPool:ToListAndFree[System.__Canon](byref):Microsoft.CodeAnalysis.Syntax.InternalSyntax.SeparatedSyntaxList`1[System.__Canon]:this (FullOpts)
        -288 (-31.14 % of base) : 2985.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -288 (-31.14 % of base) : 968.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
         -30 (-30.30 % of base) : 3364.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilder[System.ValueTuple`3[int,int,System.__Canon]]():System.Collections.Immutable.ImmutableArray`1+Builder[System.ValueTuple`3[int,int,System.__Canon]] (FullOpts)
         -48 (-30.19 % of base) : 4306.dasm - System.Linq.Enumerable:Contains[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]],System.Collections.Generic.KeyValuePair`2[System.__Canon,System.__Canon]):ubyte (FullOpts)
         -52 (-30.06 % of base) : 48.dasm - System.Linq.Enumerable:ToList[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.List`1[System.__Canon] (FullOpts)
         -52 (-30.06 % of base) : 2094.dasm - System.Linq.Enumerable:ToList[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.Generic.List`1[System.__Canon] (FullOpts)
        -147 (-29.82 % of base) : 428.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -147 (-29.82 % of base) : 2494.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -247 (-29.55 % of base) : 4198.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -122 (-29.54 % of base) : 4447.dasm - Microsoft.CodeAnalysis.PublicContract:IndexOfNullOrDuplicateItem[System.__Canon](System.Collections.Generic.IReadOnlyList`1[System.__Canon]):int (FullOpts)
         -77 (-29.28 % of base) : 827.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (FullOpts)
         -77 (-29.28 % of base) : 2844.dasm - System.Dynamic.Utils.CollectionExtensions:ToReadOnly[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.Collections.ObjectModel.ReadOnlyCollection`1[System.__Canon] (FullOpts)

realworld.run.windows.x86.checked.mch

To reproduce these diffs on Windows x86: superpmi.py asmdiffs -target_os windows -target_arch x86 -arch x86 


Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 481011 (overridden on cmd)
Total bytes of diff: 475362 (overridden on cmd)
Total bytes of delta: -5649 (-1.17 % of base)
    diff is an improvement.
    relative diff is an improvement.

Detail diffs



Top file regressions (bytes):
          71 : 6212.dasm (12.28 % of base)

Top file improvements (bytes):
        -247 : 3242.dasm (-29.98 % of base)
        -157 : 237.dasm (-35.52 % of base)
        -153 : 15922.dasm (-29.31 % of base)
        -147 : 15245.dasm (-29.82 % of base)
        -147 : 239.dasm (-29.82 % of base)
        -146 : 9523.dasm (-26.31 % of base)
        -142 : 580.dasm (-36.60 % of base)
        -130 : 10209.dasm (-36.11 % of base)
        -128 : 8222.dasm (-26.50 % of base)
        -125 : 9525.dasm (-21.22 % of base)
        -111 : 8466.dasm (-21.22 % of base)
        -102 : 8188.dasm (-25.19 % of base)
        -100 : 9129.dasm (-24.45 % of base)
         -99 : 462.dasm (-21.85 % of base)
         -99 : 6005.dasm (-24.94 % of base)
         -93 : 202.dasm (-28.01 % of base)
         -90 : 11196.dasm (-20.50 % of base)
         -90 : 2875.dasm (-24.73 % of base)
         -77 : 6399.dasm (-27.30 % of base)
         -76 : 5135.dasm (-18.67 % of base)

76 total files with Code Size differences (75 improved, 1 regressed), 0 unchanged.

Top method regressions (bytes):
          71 (12.28 % of base) : 6212.dasm - Internal.Utilities.Library.List:mapq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)

Top method improvements (bytes):
        -247 (-29.98 % of base) : 3242.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -157 (-35.52 % of base) : 237.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
        -153 (-29.31 % of base) : 15922.dasm - System.Linq.Enumerable:TryGetLast[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -147 (-29.82 % of base) : 15245.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -147 (-29.82 % of base) : 239.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -146 (-26.31 % of base) : 9523.dasm - Internal.Utilities.Collections.Tagged.SetTreeModule:union[System.__Canon](System.Collections.Generic.IComparer`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon]):Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon] (FullOpts)
        -142 (-36.60 % of base) : 580.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
        -130 (-36.11 % of base) : 10209.dasm - Internal.Utilities.Collections.Tagged.SetTreeModule:intersectionAux[System.__Canon](System.Collections.Generic.IComparer`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon]):Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon] (FullOpts)
        -128 (-26.50 % of base) : 8222.dasm - Internal.Utilities.Collections.Tagged.SetTreeModule:remove[System.__Canon](System.Collections.Generic.IComparer`1[System.__Canon],System.__Canon,Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon]):Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon] (FullOpts)
        -125 (-21.22 % of base) : 9525.dasm - Internal.Utilities.Collections.Tagged.SetTreeModule:balance[System.__Canon](System.Collections.Generic.IComparer`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon],System.__Canon,Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon]):Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon] (FullOpts)
        -111 (-21.22 % of base) : 8466.dasm - FSharp.Compiler.NameResolution:CollectAtMostOneResult[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,Internal.Utilities.Library.ResultOrException`1[System.__Canon]],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Internal.Utilities.Library.ResultOrException`1[System.__Canon] (FullOpts)
        -102 (-25.19 % of base) : 8188.dasm - Microsoft.FSharp.Primitives.Basics.List:mapi2[System.__Canon,System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[int,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
        -100 (-24.45 % of base) : 9129.dasm - FSharp.Compiler.NameResolution:CollectResults[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,Internal.Utilities.Library.ResultOrException`1[System.__Canon]],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Internal.Utilities.Library.ResultOrException`1[System.__Canon] (FullOpts)
         -99 (-24.94 % of base) : 6005.dasm - Microsoft.FSharp.Primitives.Basics.List:map2[System.__Canon,ubyte,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[ubyte]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -99 (-21.85 % of base) : 462.dasm - System.Linq.Enumerable:TryGetSingle[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -93 (-28.01 % of base) : 202.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (FullOpts)
         -90 (-20.50 % of base) : 11196.dasm - Microsoft.FSharp.Primitives.Basics.List:map3[System.__Canon,System.__Canon,System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -90 (-24.73 % of base) : 2875.dasm - Microsoft.FSharp.Primitives.Basics.List:mapi[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[int,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -77 (-27.30 % of base) : 6399.dasm - System.Collections.Immutable.ImmutableExtensions:TryGetCount[System.__Canon](System.Collections.IEnumerable,byref):ubyte (FullOpts)
         -76 (-18.67 % of base) : 5135.dasm - FSharp.Compiler.AbstractIL.ILBinaryReader:seekReadIndexedRows[System.__Canon,FSharp.Compiler.AbstractIL.ILBinaryReader+TaggedIndex`1[FSharp.Compiler.AbstractIL.BinaryConstants+TypeOrMethodDefTag],System.__Canon](int,Microsoft.FSharp.Core.FSharpFunc`2[int,System.__Canon],Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,FSharp.Compiler.AbstractIL.ILBinaryReader+TaggedIndex`1[FSharp.Compiler.AbstractIL.BinaryConstants+TypeOrMethodDefTag]],Microsoft.FSharp.Core.FSharpFunc`2[FSharp.Compiler.AbstractIL.ILBinaryReader+TaggedIndex`1[FSharp.Compiler.AbstractIL.BinaryConstants+TypeOrMethodDefTag],int],ubyte,Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)

Top method regressions (percentages):
          71 (12.28 % of base) : 6212.dasm - Internal.Utilities.Library.List:mapq[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)

Top method improvements (percentages):
        -142 (-36.60 % of base) : 580.dasm - System.Linq.Enumerable:ToArray[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon]):System.__Canon[] (FullOpts)
         -63 (-36.21 % of base) : 8669.dasm - Internal.Utilities.Library.List:splitChoose[System.__Canon,System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):System.Tuple`2[System.__Canon,System.__Canon] (FullOpts)
        -130 (-36.11 % of base) : 10209.dasm - Internal.Utilities.Collections.Tagged.SetTreeModule:intersectionAux[System.__Canon](System.Collections.Generic.IComparer`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon]):Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon] (FullOpts)
        -157 (-35.52 % of base) : 237.dasm - System.Linq.Enumerable:Skip[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],int):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -14 (-32.56 % of base) : 10176.dasm - Microsoft.FSharp.Collections.SeqModule:Empty[System.__Canon]():System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -14 (-32.56 % of base) : 12710.dasm - System.Linq.Enumerable:Empty[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]():System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]] (FullOpts)
         -30 (-30.30 % of base) : 5030.dasm - System.Collections.Immutable.ImmutableArray:CreateBuilder[System.__Canon]():System.Collections.Immutable.ImmutableArray`1+Builder[System.__Canon] (FullOpts)
         -69 (-30.26 % of base) : 9519.dasm - Internal.Utilities.Collections.Tagged.SetTreeModule:diffAux[System.__Canon](System.Collections.Generic.IComparer`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon],Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon]):Internal.Utilities.Collections.Tagged.SetTree`1[System.__Canon] (FullOpts)
        -247 (-29.98 % of base) : 3242.dasm - System.Linq.Enumerable:ToDictionary[System.__Canon,System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,System.__Canon],System.Collections.Generic.IEqualityComparer`1[System.__Canon]):System.Collections.Generic.Dictionary`2[System.__Canon,System.__Canon] (FullOpts)
        -147 (-29.82 % of base) : 15245.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
        -147 (-29.82 % of base) : 239.dasm - System.Linq.Enumerable:TryGetFirst[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -48 (-29.63 % of base) : 8994.dasm - Internal.Utilities.Library.Extras+ListSet:insert[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],System.__Canon,Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
        -153 (-29.31 % of base) : 15922.dasm - System.Linq.Enumerable:TryGetLast[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],byref):System.__Canon (FullOpts)
         -30 (-29.13 % of base) : 11373.dasm - Microsoft.FSharp.Collections.SetTreeModule:current[System.__Canon](Microsoft.FSharp.Collections.SetTreeModule+SetIterator`1[System.__Canon]):System.__Canon (FullOpts)
         -32 (-29.09 % of base) : 7460.dasm - Microsoft.FSharp.Collections.ListModule:GroupBy[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -56 (-29.02 % of base) : 233.dasm - System.Linq.Enumerable:SkipWhile[System.__Canon](System.Collections.Generic.IEnumerable`1[System.__Canon],System.Func`2[System.__Canon,ubyte]):System.Collections.Generic.IEnumerable`1[System.__Canon] (FullOpts)
         -48 (-28.57 % of base) : 8915.dasm - Microsoft.FSharp.Collections.ListModule:SortBy[System.__Canon,System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -48 (-28.57 % of base) : 10290.dasm - Microsoft.FSharp.Collections.ListModule:SortWith[System.__Canon](Microsoft.FSharp.Core.FSharpFunc`2[System.__Canon,System.__Canon],Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):Microsoft.FSharp.Collections.FSharpList`1[System.__Canon] (FullOpts)
         -93 (-28.01 % of base) : 202.dasm - System.Linq.Enumerable:TryGetNonEnumeratedCount[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]](System.Collections.Generic.IEnumerable`1[System.Collections.Generic.KeyValuePair`2[int,System.__Canon]],byref):ubyte (FullOpts)
         -14 (-28.00 % of base) : 6225.dasm - Microsoft.FSharp.Collections.ArrayModule:OfList[System.__Canon](Microsoft.FSharp.Collections.FSharpList`1[System.__Canon]):System.__Canon[] (FullOpts)