[JitDiff X64] [xtqqczze] Use zero-extension in`Memory<T>.Pin`

[MihuBot]

Job completed in 17 minutes 24 seconds (remote runner delay: 1 minute 19 seconds).
dotnet/runtime#119895

Diffs

Found 84 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 41727300
Total bytes of diff: 41727148
Total bytes of delta: -152 (-0.00 % of base)
Total relative delta: -0.48
    diff is an improvement.
    relative diff is an improvement.


Top file improvements (bytes):
        -152 : System.Private.CoreLib.dasm (-0.00 % of base)

1 total files with Code Size differences (1 improved, 0 regressed), 259 unchanged.

Top method improvements (bytes):
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[double]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[int]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[long]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[short]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[System.Nullable`1[int]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[double]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[int]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[long]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[short]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[System.Nullable`1[int]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.52 % of base) : System.Private.CoreLib.dasm - System.Memory`1[byte]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.46 % of base) : System.Private.CoreLib.dasm - System.Memory`1[System.Numerics.Vector`1[float]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.52 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[byte]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.46 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[System.Numerics.Vector`1[float]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)

Top method improvements (percentages):
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[double]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[int]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[long]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[short]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.Memory`1[System.Nullable`1[int]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[double]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[int]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[long]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[short]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
         -10 (-3.13 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[System.Nullable`1[int]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.52 % of base) : System.Private.CoreLib.dasm - System.Memory`1[byte]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.52 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[byte]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.46 % of base) : System.Private.CoreLib.dasm - System.Memory`1[System.Numerics.Vector`1[float]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
          -8 (-2.46 % of base) : System.Private.CoreLib.dasm - System.ReadOnlyMemory`1[System.Numerics.Vector`1[float]]:Pin():System.Buffers.MemoryHandle:this (FullOpts)

16 total methods with Code Size differences (16 improved, 0 regressed), 250787 unchanged.

--------------------------------------------------------------------------------

Artifacts:

• build-clr-checked-main.zip (88 MB)
• build-artifacts-main.zip (682 MB)
• build-clr-checked-pr.zip (88 MB)
• build-artifacts-pr.zip (683 MB)
• jit-diffs-main.zip (138 MB)
• jit-diffs-pr.zip (138 MB)
• diff-frameworks.txt (5 KB)
• ShortDiffsImprovements.md (54 KB)
• LongDiffsImprovements.md (176 KB)

[MihuBot]

Top method improvements

-10 (-3.13 % of base) - System.Memory`1[double]:Pin():System.Buffers.MemoryHandle:this

 ; Assembly listing for method System.Memory`1[double]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 5 single block inlinees; 2 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  7,  5   )   byref  ->  r15         this single-def
 ;  V01 RetBuf       [V01,T00] ( 11,  6.50)    long  ->  rbx         single-def
 ;  V02 loc0         [V02,T02] (  9,  5.50)     ref  ->  r14         class-hnd single-def <System.Object>
 ;* V03 loc1         [V03    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <System.String>
 ;* V04 loc2         [V04    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V05 loc3         [V05    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.Runtime.InteropServices.GCHandle>
 ;* V06 loc4         [V06    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V07 loc5         [V07    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op <System.Buffers.MemoryHandle>
 ;# V08 OutArgs      [V08    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
 ;* V09 tmp1         [V09    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "updating class info" <System.Buffers.MemoryManager`1[double]>
 ;* V10 tmp2         [V10    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <double[]>
 ;* V11 tmp3         [V11    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;* V12 tmp4         [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <double[]>
-;  V13 tmp5         [V13,T05] (  2,  2   )    long  ->  rax         "impAppendStmt"
+;* V13 tmp5         [V13    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;* V14 tmp6         [V14    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;  V15 tmp7         [V15,T04] (  2,  2   )   byref  ->  rdx         single-def "Inlining Arg"
 ;* V16 tmp8         [V16    ] (  0,  0   )  struct ( 8) zero-ref    "Inlining Arg" <System.Runtime.InteropServices.GCHandle>
 ;* V17 tmp9         [V17    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Runtime.InteropServices.GCHandle>
 ;* V18 tmp10        [V18    ] (  0,  0   )    long  ->  zero-ref    "Inline stloc first use temp"
-;  V19 tmp11        [V19,T11] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
+;  V19 tmp11        [V19,T09] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
 ;  V20 tmp12        [V20,T03] (  4,  2   )    long  ->  rax         "Inline stloc first use temp"
 ;* V21 tmp13        [V21    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V22 tmp14        [V22    ] (  0,  0   )    long  ->  zero-ref    "field V04._handle (fldOffset=0x0)" P-INDEP
 ;* V23 tmp15        [V23    ] (  0,  0   )    long  ->  zero-ref    "field V05._handle (fldOffset=0x0)" P-INDEP
 ;* V24 tmp16        [V24    ] (  0,  0   )    long  ->  zero-ref    "field V06._handle (fldOffset=0x0)" P-INDEP
 ;* V25 tmp17        [V25    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V07._pinnable (fldOffset=0x0)" P-INDEP
 ;* V26 tmp18        [V26    ] (  0,  0   )    long  ->  zero-ref    "field V07._pointer (fldOffset=0x8)" P-INDEP
 ;* V27 tmp19        [V27    ] (  0,  0   )    long  ->  zero-ref    "field V07._handle (fldOffset=0x10)" P-INDEP
 ;* V28 tmp20        [V28    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V11._pinnable (fldOffset=0x0)" P-INDEP
-;  V29 tmp21        [V29,T09] (  2,  1   )    long  ->  rdi         "field V11._pointer (fldOffset=0x8)" P-INDEP
+;* V29 tmp21        [V29    ] (  0,  0   )    long  ->  zero-ref    "field V11._pointer (fldOffset=0x8)" P-INDEP
 ;* V30 tmp22        [V30    ] (  0,  0   )    long  ->  zero-ref    "field V11._handle (fldOffset=0x10)" P-INDEP
 ;* V31 tmp23        [V31    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V14._pinnable (fldOffset=0x0)" P-INDEP
 ;* V32 tmp24        [V32    ] (  0,  0   )    long  ->  zero-ref    "field V14._pointer (fldOffset=0x8)" P-INDEP
 ;* V33 tmp25        [V33    ] (  0,  0   )    long  ->  zero-ref    "field V14._handle (fldOffset=0x10)" P-INDEP
 ;* V34 tmp26        [V34    ] (  0,  0   )    long  ->  zero-ref    "field V16._handle (fldOffset=0x0)" P-INDEP
-;  V35 tmp27        [V35,T10] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
-;  V36 tmp28        [V36,T06] (  2,  2   )    long  ->  r14         "Cast away GC"
-;  V37 tmp29        [V37,T12] (  2,  0   )     ref  ->  rbx         single-def "argument with side effect"
-;  V38 tmp30        [V38,T13] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
-;  V39 tmp31        [V39,T07] (  2,  2   )    long  ->  rax         "Cast away GC"
-;  V40 cse0         [V40,T08] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
+;  V35 tmp27        [V35,T08] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
+;  V36 tmp28        [V36,T05] (  2,  2   )    long  ->  rdi         "Cast away GC"
+;  V37 tmp29        [V37,T10] (  2,  0   )     ref  ->  r14         single-def "argument with side effect"
+;  V38 tmp30        [V38,T11] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
+;  V39 tmp31        [V39,T06] (  2,  2   )    long  ->  rax         "Cast away GC"
+;  V40 cse0         [V40,T07] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
 ;
 ; Lcl frame size = 8
 
 G_M60741_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
        mov      r15, rdi
        mov      rbx, rsi
 						;; size=18 bbWeight=1 PerfScore 6.00
 G_M60741_IG02:
        mov      r14, gword ptr [r15]
        test     r14, r14
        jne      SHORT G_M60741_IG04
 						;; size=8 bbWeight=1 PerfScore 3.25
 G_M60741_IG03:
        xor      edx, edx
        mov      qword ptr [rbx], rdx
        mov      qword ptr [rbx+0x08], rdx
        mov      qword ptr [rbx+0x10], rdx
        jmp      G_M60741_IG10
 						;; size=18 bbWeight=0.50 PerfScore 2.62
 G_M60741_IG04:
        mov      rax, qword ptr [r14]
        mov      rdx, rax
        test     dword ptr [rdx], 0xD1FFAB1E
        jne      SHORT G_M60741_IG06
        mov      edx, dword ptr [r15+0x08]
        mov      rdi, r14
        mov      rsi, rbx
        mov      rax, qword ptr [rax+0x40]
 						;; size=28 bbWeight=0.50 PerfScore 5.38
 G_M60741_IG05:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        tail.jmp [rax+0x30]System.Buffers.MemoryManager`1[double]:Pin(int):System.Buffers.MemoryHandle:this
 						;; size=14 bbWeight=0.50 PerfScore 3.12
 G_M60741_IG06:
        cmp      dword ptr [r15+0x08], 0
        jl       SHORT G_M60741_IG08
        mov      rdi, r14
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        call     [rax]System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        test     eax, eax
        je       SHORT G_M60741_IG12
        mov      rdi, r14
        mov      esi, 3
        call     System.Runtime.InteropServices.GCHandle:_InternalAlloc(System.Object,int):nint
        test     rax, rax
        jne      SHORT G_M60741_IG07
        mov      rdi, r14
        mov      esi, 3
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
        call     [rax]System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
 						;; size=64 bbWeight=0.50 PerfScore 7.62
 G_M60741_IG07:
        or       rax, 1
-       add      r14, 16
-       movsxd   rdi, dword ptr [r15+0x08]
-       lea      rdi, [r14+8*rdi]
+       mov      edi, dword ptr [r15+0x08]
+       lea      rdi, bword ptr [r14+8*rdi+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rdi
        mov      qword ptr [rbx+0x10], rax
        jmp      SHORT G_M60741_IG10
-						;; size=31 bbWeight=0.50 PerfScore 5.12
+						;; size=28 bbWeight=0.50 PerfScore 4.25
 G_M60741_IG08:
-       lea      rax, bword ptr [r14+0x10]
-       mov      ecx, dword ptr [r15+0x08]
-       and      ecx, 0xD1FFAB1E
-       movsxd   rcx, ecx
-       lea      rax, [rax+8*rcx]
+       mov      eax, dword ptr [r15+0x08]
+       and      eax, 0xD1FFAB1E
+       lea      rax, bword ptr [r14+8*rax+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rax
-						;; size=30 bbWeight=0.50 PerfScore 2.88
+						;; size=23 bbWeight=0.50 PerfScore 2.75
 G_M60741_IG09:
        mov      qword ptr [rbx+0x10], rcx
 						;; size=4 bbWeight=0.50 PerfScore 0.50
 G_M60741_IG10:
        mov      rax, rbx
 						;; size=3 bbWeight=0.50 PerfScore 0.12
 G_M60741_IG11:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=0.50 PerfScore 1.62
 G_M60741_IG12:
        mov      rdi, 0xD1FFAB1E      ; System.ArgumentException
        call     CORINFO_HELP_NEWSFAST
        mov      r15, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SR:get_ArgumentException_NotIsomorphic():System.String
        call     [rax]System.SR:get_ArgumentException_NotIsomorphic():System.String
-       mov      rbx, rax
+       mov      r14, rax
        mov      edi, 61
        mov      rsi, 0xD1FFAB1E
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_STRCNS
        call     [rax]CORINFO_HELP_STRCNS
        mov      rdx, rax
-       mov      rsi, rbx
+       mov      rsi, r14
        mov      rdi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.ArgumentException:.ctor(System.String,System.String):this
        call     [rax]System.ArgumentException:.ctor(System.String,System.String):this
        mov      rdi, r15
        call     CORINFO_HELP_THROW
        int3     
 						;; size=90 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 319, prolog size 18, PerfScore 38.25, instruction count 89, allocated bytes for code 319 (MethodHash=13f012ba) for method System.Memory`1[double]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
+; Total bytes of code 309, prolog size 18, PerfScore 37.25, instruction count 86, allocated bytes for code 309 (MethodHash=13f012ba) for method System.Memory`1[double]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; ============================================================

-10 (-3.13 % of base) - System.Memory`1[int]:Pin():System.Buffers.MemoryHandle:this

 ; Assembly listing for method System.Memory`1[int]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 5 single block inlinees; 2 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  7,  5   )   byref  ->  r15         this single-def
 ;  V01 RetBuf       [V01,T00] ( 11,  6.50)    long  ->  rbx         single-def
 ;  V02 loc0         [V02,T02] (  9,  5.50)     ref  ->  r14         class-hnd single-def <System.Object>
 ;* V03 loc1         [V03    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <System.String>
 ;* V04 loc2         [V04    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V05 loc3         [V05    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.Runtime.InteropServices.GCHandle>
 ;* V06 loc4         [V06    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V07 loc5         [V07    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op <System.Buffers.MemoryHandle>
 ;# V08 OutArgs      [V08    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
 ;* V09 tmp1         [V09    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "updating class info" <System.Buffers.MemoryManager`1[int]>
 ;* V10 tmp2         [V10    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <int[]>
 ;* V11 tmp3         [V11    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;* V12 tmp4         [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <int[]>
-;  V13 tmp5         [V13,T05] (  2,  2   )    long  ->  rax         "impAppendStmt"
+;* V13 tmp5         [V13    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;* V14 tmp6         [V14    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;  V15 tmp7         [V15,T04] (  2,  2   )   byref  ->  rdx         single-def "Inlining Arg"
 ;* V16 tmp8         [V16    ] (  0,  0   )  struct ( 8) zero-ref    "Inlining Arg" <System.Runtime.InteropServices.GCHandle>
 ;* V17 tmp9         [V17    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Runtime.InteropServices.GCHandle>
 ;* V18 tmp10        [V18    ] (  0,  0   )    long  ->  zero-ref    "Inline stloc first use temp"
-;  V19 tmp11        [V19,T11] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
+;  V19 tmp11        [V19,T09] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
 ;  V20 tmp12        [V20,T03] (  4,  2   )    long  ->  rax         "Inline stloc first use temp"
 ;* V21 tmp13        [V21    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V22 tmp14        [V22    ] (  0,  0   )    long  ->  zero-ref    "field V04._handle (fldOffset=0x0)" P-INDEP
 ;* V23 tmp15        [V23    ] (  0,  0   )    long  ->  zero-ref    "field V05._handle (fldOffset=0x0)" P-INDEP
 ;* V24 tmp16        [V24    ] (  0,  0   )    long  ->  zero-ref    "field V06._handle (fldOffset=0x0)" P-INDEP
 ;* V25 tmp17        [V25    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V07._pinnable (fldOffset=0x0)" P-INDEP
 ;* V26 tmp18        [V26    ] (  0,  0   )    long  ->  zero-ref    "field V07._pointer (fldOffset=0x8)" P-INDEP
 ;* V27 tmp19        [V27    ] (  0,  0   )    long  ->  zero-ref    "field V07._handle (fldOffset=0x10)" P-INDEP
 ;* V28 tmp20        [V28    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V11._pinnable (fldOffset=0x0)" P-INDEP
-;  V29 tmp21        [V29,T09] (  2,  1   )    long  ->  rdi         "field V11._pointer (fldOffset=0x8)" P-INDEP
+;* V29 tmp21        [V29    ] (  0,  0   )    long  ->  zero-ref    "field V11._pointer (fldOffset=0x8)" P-INDEP
 ;* V30 tmp22        [V30    ] (  0,  0   )    long  ->  zero-ref    "field V11._handle (fldOffset=0x10)" P-INDEP
 ;* V31 tmp23        [V31    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V14._pinnable (fldOffset=0x0)" P-INDEP
 ;* V32 tmp24        [V32    ] (  0,  0   )    long  ->  zero-ref    "field V14._pointer (fldOffset=0x8)" P-INDEP
 ;* V33 tmp25        [V33    ] (  0,  0   )    long  ->  zero-ref    "field V14._handle (fldOffset=0x10)" P-INDEP
 ;* V34 tmp26        [V34    ] (  0,  0   )    long  ->  zero-ref    "field V16._handle (fldOffset=0x0)" P-INDEP
-;  V35 tmp27        [V35,T10] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
-;  V36 tmp28        [V36,T06] (  2,  2   )    long  ->  r14         "Cast away GC"
-;  V37 tmp29        [V37,T12] (  2,  0   )     ref  ->  rbx         single-def "argument with side effect"
-;  V38 tmp30        [V38,T13] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
-;  V39 tmp31        [V39,T07] (  2,  2   )    long  ->  rax         "Cast away GC"
-;  V40 cse0         [V40,T08] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
+;  V35 tmp27        [V35,T08] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
+;  V36 tmp28        [V36,T05] (  2,  2   )    long  ->  rdi         "Cast away GC"
+;  V37 tmp29        [V37,T10] (  2,  0   )     ref  ->  r14         single-def "argument with side effect"
+;  V38 tmp30        [V38,T11] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
+;  V39 tmp31        [V39,T06] (  2,  2   )    long  ->  rax         "Cast away GC"
+;  V40 cse0         [V40,T07] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
 ;
 ; Lcl frame size = 8
 
 G_M36003_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
        mov      r15, rdi
        mov      rbx, rsi
 						;; size=18 bbWeight=1 PerfScore 6.00
 G_M36003_IG02:
        mov      r14, gword ptr [r15]
        test     r14, r14
        jne      SHORT G_M36003_IG04
 						;; size=8 bbWeight=1 PerfScore 3.25
 G_M36003_IG03:
        xor      edx, edx
        mov      qword ptr [rbx], rdx
        mov      qword ptr [rbx+0x08], rdx
        mov      qword ptr [rbx+0x10], rdx
        jmp      G_M36003_IG10
 						;; size=18 bbWeight=0.50 PerfScore 2.62
 G_M36003_IG04:
        mov      rax, qword ptr [r14]
        mov      rdx, rax
        test     dword ptr [rdx], 0xD1FFAB1E
        jne      SHORT G_M36003_IG06
        mov      edx, dword ptr [r15+0x08]
        mov      rdi, r14
        mov      rsi, rbx
        mov      rax, qword ptr [rax+0x40]
 						;; size=28 bbWeight=0.50 PerfScore 5.38
 G_M36003_IG05:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        tail.jmp [rax+0x30]System.Buffers.MemoryManager`1[int]:Pin(int):System.Buffers.MemoryHandle:this
 						;; size=14 bbWeight=0.50 PerfScore 3.12
 G_M36003_IG06:
        cmp      dword ptr [r15+0x08], 0
        jl       SHORT G_M36003_IG08
        mov      rdi, r14
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        call     [rax]System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        test     eax, eax
        je       SHORT G_M36003_IG12
        mov      rdi, r14
        mov      esi, 3
        call     System.Runtime.InteropServices.GCHandle:_InternalAlloc(System.Object,int):nint
        test     rax, rax
        jne      SHORT G_M36003_IG07
        mov      rdi, r14
        mov      esi, 3
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
        call     [rax]System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
 						;; size=64 bbWeight=0.50 PerfScore 7.62
 G_M36003_IG07:
        or       rax, 1
-       add      r14, 16
-       movsxd   rdi, dword ptr [r15+0x08]
-       lea      rdi, [r14+4*rdi]
+       mov      edi, dword ptr [r15+0x08]
+       lea      rdi, bword ptr [r14+4*rdi+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rdi
        mov      qword ptr [rbx+0x10], rax
        jmp      SHORT G_M36003_IG10
-						;; size=31 bbWeight=0.50 PerfScore 5.12
+						;; size=28 bbWeight=0.50 PerfScore 4.25
 G_M36003_IG08:
-       lea      rax, bword ptr [r14+0x10]
-       mov      ecx, dword ptr [r15+0x08]
-       and      ecx, 0xD1FFAB1E
-       movsxd   rcx, ecx
-       lea      rax, [rax+4*rcx]
+       mov      eax, dword ptr [r15+0x08]
+       and      eax, 0xD1FFAB1E
+       lea      rax, bword ptr [r14+4*rax+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rax
-						;; size=30 bbWeight=0.50 PerfScore 2.88
+						;; size=23 bbWeight=0.50 PerfScore 2.75
 G_M36003_IG09:
        mov      qword ptr [rbx+0x10], rcx
 						;; size=4 bbWeight=0.50 PerfScore 0.50
 G_M36003_IG10:
        mov      rax, rbx
 						;; size=3 bbWeight=0.50 PerfScore 0.12
 G_M36003_IG11:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=0.50 PerfScore 1.62
 G_M36003_IG12:
        mov      rdi, 0xD1FFAB1E      ; System.ArgumentException
        call     CORINFO_HELP_NEWSFAST
        mov      r15, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SR:get_ArgumentException_NotIsomorphic():System.String
        call     [rax]System.SR:get_ArgumentException_NotIsomorphic():System.String
-       mov      rbx, rax
+       mov      r14, rax
        mov      edi, 61
        mov      rsi, 0xD1FFAB1E
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_STRCNS
        call     [rax]CORINFO_HELP_STRCNS
        mov      rdx, rax
-       mov      rsi, rbx
+       mov      rsi, r14
        mov      rdi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.ArgumentException:.ctor(System.String,System.String):this
        call     [rax]System.ArgumentException:.ctor(System.String,System.String):this
        mov      rdi, r15
        call     CORINFO_HELP_THROW
        int3     
 						;; size=90 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 319, prolog size 18, PerfScore 38.25, instruction count 89, allocated bytes for code 319 (MethodHash=510e735c) for method System.Memory`1[int]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
+; Total bytes of code 309, prolog size 18, PerfScore 37.25, instruction count 86, allocated bytes for code 309 (MethodHash=510e735c) for method System.Memory`1[int]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; ============================================================

-10 (-3.13 % of base) - System.Memory`1[long]:Pin():System.Buffers.MemoryHandle:this

 ; Assembly listing for method System.Memory`1[long]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 5 single block inlinees; 2 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  7,  5   )   byref  ->  r15         this single-def
 ;  V01 RetBuf       [V01,T00] ( 11,  6.50)    long  ->  rbx         single-def
 ;  V02 loc0         [V02,T02] (  9,  5.50)     ref  ->  r14         class-hnd single-def <System.Object>
 ;* V03 loc1         [V03    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <System.String>
 ;* V04 loc2         [V04    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V05 loc3         [V05    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.Runtime.InteropServices.GCHandle>
 ;* V06 loc4         [V06    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V07 loc5         [V07    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op <System.Buffers.MemoryHandle>
 ;# V08 OutArgs      [V08    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
 ;* V09 tmp1         [V09    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "updating class info" <System.Buffers.MemoryManager`1[long]>
 ;* V10 tmp2         [V10    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <long[]>
 ;* V11 tmp3         [V11    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;* V12 tmp4         [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <long[]>
-;  V13 tmp5         [V13,T05] (  2,  2   )    long  ->  rax         "impAppendStmt"
+;* V13 tmp5         [V13    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;* V14 tmp6         [V14    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;  V15 tmp7         [V15,T04] (  2,  2   )   byref  ->  rdx         single-def "Inlining Arg"
 ;* V16 tmp8         [V16    ] (  0,  0   )  struct ( 8) zero-ref    "Inlining Arg" <System.Runtime.InteropServices.GCHandle>
 ;* V17 tmp9         [V17    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Runtime.InteropServices.GCHandle>
 ;* V18 tmp10        [V18    ] (  0,  0   )    long  ->  zero-ref    "Inline stloc first use temp"
-;  V19 tmp11        [V19,T11] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
+;  V19 tmp11        [V19,T09] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
 ;  V20 tmp12        [V20,T03] (  4,  2   )    long  ->  rax         "Inline stloc first use temp"
 ;* V21 tmp13        [V21    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V22 tmp14        [V22    ] (  0,  0   )    long  ->  zero-ref    "field V04._handle (fldOffset=0x0)" P-INDEP
 ;* V23 tmp15        [V23    ] (  0,  0   )    long  ->  zero-ref    "field V05._handle (fldOffset=0x0)" P-INDEP
 ;* V24 tmp16        [V24    ] (  0,  0   )    long  ->  zero-ref    "field V06._handle (fldOffset=0x0)" P-INDEP
 ;* V25 tmp17        [V25    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V07._pinnable (fldOffset=0x0)" P-INDEP
 ;* V26 tmp18        [V26    ] (  0,  0   )    long  ->  zero-ref    "field V07._pointer (fldOffset=0x8)" P-INDEP
 ;* V27 tmp19        [V27    ] (  0,  0   )    long  ->  zero-ref    "field V07._handle (fldOffset=0x10)" P-INDEP
 ;* V28 tmp20        [V28    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V11._pinnable (fldOffset=0x0)" P-INDEP
-;  V29 tmp21        [V29,T09] (  2,  1   )    long  ->  rdi         "field V11._pointer (fldOffset=0x8)" P-INDEP
+;* V29 tmp21        [V29    ] (  0,  0   )    long  ->  zero-ref    "field V11._pointer (fldOffset=0x8)" P-INDEP
 ;* V30 tmp22        [V30    ] (  0,  0   )    long  ->  zero-ref    "field V11._handle (fldOffset=0x10)" P-INDEP
 ;* V31 tmp23        [V31    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V14._pinnable (fldOffset=0x0)" P-INDEP
 ;* V32 tmp24        [V32    ] (  0,  0   )    long  ->  zero-ref    "field V14._pointer (fldOffset=0x8)" P-INDEP
 ;* V33 tmp25        [V33    ] (  0,  0   )    long  ->  zero-ref    "field V14._handle (fldOffset=0x10)" P-INDEP
 ;* V34 tmp26        [V34    ] (  0,  0   )    long  ->  zero-ref    "field V16._handle (fldOffset=0x0)" P-INDEP
-;  V35 tmp27        [V35,T10] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
-;  V36 tmp28        [V36,T06] (  2,  2   )    long  ->  r14         "Cast away GC"
-;  V37 tmp29        [V37,T12] (  2,  0   )     ref  ->  rbx         single-def "argument with side effect"
-;  V38 tmp30        [V38,T13] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
-;  V39 tmp31        [V39,T07] (  2,  2   )    long  ->  rax         "Cast away GC"
-;  V40 cse0         [V40,T08] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
+;  V35 tmp27        [V35,T08] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
+;  V36 tmp28        [V36,T05] (  2,  2   )    long  ->  rdi         "Cast away GC"
+;  V37 tmp29        [V37,T10] (  2,  0   )     ref  ->  r14         single-def "argument with side effect"
+;  V38 tmp30        [V38,T11] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
+;  V39 tmp31        [V39,T06] (  2,  2   )    long  ->  rax         "Cast away GC"
+;  V40 cse0         [V40,T07] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
 ;
 ; Lcl frame size = 8
 
 G_M36410_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
        mov      r15, rdi
        mov      rbx, rsi
 						;; size=18 bbWeight=1 PerfScore 6.00
 G_M36410_IG02:
        mov      r14, gword ptr [r15]
        test     r14, r14
        jne      SHORT G_M36410_IG04
 						;; size=8 bbWeight=1 PerfScore 3.25
 G_M36410_IG03:
        xor      edx, edx
        mov      qword ptr [rbx], rdx
        mov      qword ptr [rbx+0x08], rdx
        mov      qword ptr [rbx+0x10], rdx
        jmp      G_M36410_IG10
 						;; size=18 bbWeight=0.50 PerfScore 2.62
 G_M36410_IG04:
        mov      rax, qword ptr [r14]
        mov      rdx, rax
        test     dword ptr [rdx], 0xD1FFAB1E
        jne      SHORT G_M36410_IG06
        mov      edx, dword ptr [r15+0x08]
        mov      rdi, r14
        mov      rsi, rbx
        mov      rax, qword ptr [rax+0x40]
 						;; size=28 bbWeight=0.50 PerfScore 5.38
 G_M36410_IG05:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        tail.jmp [rax+0x30]System.Buffers.MemoryManager`1[long]:Pin(int):System.Buffers.MemoryHandle:this
 						;; size=14 bbWeight=0.50 PerfScore 3.12
 G_M36410_IG06:
        cmp      dword ptr [r15+0x08], 0
        jl       SHORT G_M36410_IG08
        mov      rdi, r14
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        call     [rax]System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        test     eax, eax
        je       SHORT G_M36410_IG12
        mov      rdi, r14
        mov      esi, 3
        call     System.Runtime.InteropServices.GCHandle:_InternalAlloc(System.Object,int):nint
        test     rax, rax
        jne      SHORT G_M36410_IG07
        mov      rdi, r14
        mov      esi, 3
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
        call     [rax]System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
 						;; size=64 bbWeight=0.50 PerfScore 7.62
 G_M36410_IG07:
        or       rax, 1
-       add      r14, 16
-       movsxd   rdi, dword ptr [r15+0x08]
-       lea      rdi, [r14+8*rdi]
+       mov      edi, dword ptr [r15+0x08]
+       lea      rdi, bword ptr [r14+8*rdi+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rdi
        mov      qword ptr [rbx+0x10], rax
        jmp      SHORT G_M36410_IG10
-						;; size=31 bbWeight=0.50 PerfScore 5.12
+						;; size=28 bbWeight=0.50 PerfScore 4.25
 G_M36410_IG08:
-       lea      rax, bword ptr [r14+0x10]
-       mov      ecx, dword ptr [r15+0x08]
-       and      ecx, 0xD1FFAB1E
-       movsxd   rcx, ecx
-       lea      rax, [rax+8*rcx]
+       mov      eax, dword ptr [r15+0x08]
+       and      eax, 0xD1FFAB1E
+       lea      rax, bword ptr [r14+8*rax+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rax
-						;; size=30 bbWeight=0.50 PerfScore 2.88
+						;; size=23 bbWeight=0.50 PerfScore 2.75
 G_M36410_IG09:
        mov      qword ptr [rbx+0x10], rcx
 						;; size=4 bbWeight=0.50 PerfScore 0.50
 G_M36410_IG10:
        mov      rax, rbx
 						;; size=3 bbWeight=0.50 PerfScore 0.12
 G_M36410_IG11:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=0.50 PerfScore 1.62
 G_M36410_IG12:
        mov      rdi, 0xD1FFAB1E      ; System.ArgumentException
        call     CORINFO_HELP_NEWSFAST
        mov      r15, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SR:get_ArgumentException_NotIsomorphic():System.String
        call     [rax]System.SR:get_ArgumentException_NotIsomorphic():System.String
-       mov      rbx, rax
+       mov      r14, rax
        mov      edi, 61
        mov      rsi, 0xD1FFAB1E
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_STRCNS
        call     [rax]CORINFO_HELP_STRCNS
        mov      rdx, rax
-       mov      rsi, rbx
+       mov      rsi, r14
        mov      rdi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.ArgumentException:.ctor(System.String,System.String):this
        call     [rax]System.ArgumentException:.ctor(System.String,System.String):this
        mov      rdi, r15
        call     CORINFO_HELP_THROW
        int3     
 						;; size=90 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 319, prolog size 18, PerfScore 38.25, instruction count 89, allocated bytes for code 319 (MethodHash=9fb071c5) for method System.Memory`1[long]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
+; Total bytes of code 309, prolog size 18, PerfScore 37.25, instruction count 86, allocated bytes for code 309 (MethodHash=9fb071c5) for method System.Memory`1[long]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; ============================================================

-10 (-3.13 % of base) - System.Memory`1[short]:Pin():System.Buffers.MemoryHandle:this

 ; Assembly listing for method System.Memory`1[short]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 5 single block inlinees; 2 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  7,  5   )   byref  ->  r15         this single-def
 ;  V01 RetBuf       [V01,T00] ( 11,  6.50)    long  ->  rbx         single-def
 ;  V02 loc0         [V02,T02] (  9,  5.50)     ref  ->  r14         class-hnd single-def <System.Object>
 ;* V03 loc1         [V03    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <System.String>
 ;* V04 loc2         [V04    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V05 loc3         [V05    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.Runtime.InteropServices.GCHandle>
 ;* V06 loc4         [V06    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V07 loc5         [V07    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op <System.Buffers.MemoryHandle>
 ;# V08 OutArgs      [V08    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
 ;* V09 tmp1         [V09    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "updating class info" <System.Buffers.MemoryManager`1[short]>
 ;* V10 tmp2         [V10    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <short[]>
 ;* V11 tmp3         [V11    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;* V12 tmp4         [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <short[]>
-;  V13 tmp5         [V13,T05] (  2,  2   )    long  ->  rax         "impAppendStmt"
+;* V13 tmp5         [V13    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;* V14 tmp6         [V14    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;  V15 tmp7         [V15,T04] (  2,  2   )   byref  ->  rdx         single-def "Inlining Arg"
 ;* V16 tmp8         [V16    ] (  0,  0   )  struct ( 8) zero-ref    "Inlining Arg" <System.Runtime.InteropServices.GCHandle>
 ;* V17 tmp9         [V17    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Runtime.InteropServices.GCHandle>
 ;* V18 tmp10        [V18    ] (  0,  0   )    long  ->  zero-ref    "Inline stloc first use temp"
-;  V19 tmp11        [V19,T11] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
+;  V19 tmp11        [V19,T09] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
 ;  V20 tmp12        [V20,T03] (  4,  2   )    long  ->  rax         "Inline stloc first use temp"
 ;* V21 tmp13        [V21    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V22 tmp14        [V22    ] (  0,  0   )    long  ->  zero-ref    "field V04._handle (fldOffset=0x0)" P-INDEP
 ;* V23 tmp15        [V23    ] (  0,  0   )    long  ->  zero-ref    "field V05._handle (fldOffset=0x0)" P-INDEP
 ;* V24 tmp16        [V24    ] (  0,  0   )    long  ->  zero-ref    "field V06._handle (fldOffset=0x0)" P-INDEP
 ;* V25 tmp17        [V25    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V07._pinnable (fldOffset=0x0)" P-INDEP
 ;* V26 tmp18        [V26    ] (  0,  0   )    long  ->  zero-ref    "field V07._pointer (fldOffset=0x8)" P-INDEP
 ;* V27 tmp19        [V27    ] (  0,  0   )    long  ->  zero-ref    "field V07._handle (fldOffset=0x10)" P-INDEP
 ;* V28 tmp20        [V28    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V11._pinnable (fldOffset=0x0)" P-INDEP
-;  V29 tmp21        [V29,T09] (  2,  1   )    long  ->  rdi         "field V11._pointer (fldOffset=0x8)" P-INDEP
+;* V29 tmp21        [V29    ] (  0,  0   )    long  ->  zero-ref    "field V11._pointer (fldOffset=0x8)" P-INDEP
 ;* V30 tmp22        [V30    ] (  0,  0   )    long  ->  zero-ref    "field V11._handle (fldOffset=0x10)" P-INDEP
 ;* V31 tmp23        [V31    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V14._pinnable (fldOffset=0x0)" P-INDEP
 ;* V32 tmp24        [V32    ] (  0,  0   )    long  ->  zero-ref    "field V14._pointer (fldOffset=0x8)" P-INDEP
 ;* V33 tmp25        [V33    ] (  0,  0   )    long  ->  zero-ref    "field V14._handle (fldOffset=0x10)" P-INDEP
 ;* V34 tmp26        [V34    ] (  0,  0   )    long  ->  zero-ref    "field V16._handle (fldOffset=0x0)" P-INDEP
-;  V35 tmp27        [V35,T10] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
-;  V36 tmp28        [V36,T06] (  2,  2   )    long  ->  r14         "Cast away GC"
-;  V37 tmp29        [V37,T12] (  2,  0   )     ref  ->  rbx         single-def "argument with side effect"
-;  V38 tmp30        [V38,T13] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
-;  V39 tmp31        [V39,T07] (  2,  2   )    long  ->  rax         "Cast away GC"
-;  V40 cse0         [V40,T08] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
+;  V35 tmp27        [V35,T08] (  2,  1   )    long  ->  rax         "field V17._handle (fldOffset=0x0)" P-INDEP
+;  V36 tmp28        [V36,T05] (  2,  2   )    long  ->  rdi         "Cast away GC"
+;  V37 tmp29        [V37,T10] (  2,  0   )     ref  ->  r14         single-def "argument with side effect"
+;  V38 tmp30        [V38,T11] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
+;  V39 tmp31        [V39,T06] (  2,  2   )    long  ->  rax         "Cast away GC"
+;  V40 cse0         [V40,T07] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
 ;
 ; Lcl frame size = 8
 
 G_M61410_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
        mov      r15, rdi
        mov      rbx, rsi
 						;; size=18 bbWeight=1 PerfScore 6.00
 G_M61410_IG02:
        mov      r14, gword ptr [r15]
        test     r14, r14
        jne      SHORT G_M61410_IG04
 						;; size=8 bbWeight=1 PerfScore 3.25
 G_M61410_IG03:
        xor      edx, edx
        mov      qword ptr [rbx], rdx
        mov      qword ptr [rbx+0x08], rdx
        mov      qword ptr [rbx+0x10], rdx
        jmp      G_M61410_IG10
 						;; size=18 bbWeight=0.50 PerfScore 2.62
 G_M61410_IG04:
        mov      rax, qword ptr [r14]
        mov      rdx, rax
        test     dword ptr [rdx], 0xD1FFAB1E
        jne      SHORT G_M61410_IG06
        mov      edx, dword ptr [r15+0x08]
        mov      rdi, r14
        mov      rsi, rbx
        mov      rax, qword ptr [rax+0x40]
 						;; size=28 bbWeight=0.50 PerfScore 5.38
 G_M61410_IG05:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        tail.jmp [rax+0x30]System.Buffers.MemoryManager`1[short]:Pin(int):System.Buffers.MemoryHandle:this
 						;; size=14 bbWeight=0.50 PerfScore 3.12
 G_M61410_IG06:
        cmp      dword ptr [r15+0x08], 0
        jl       SHORT G_M61410_IG08
        mov      rdi, r14
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        call     [rax]System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        test     eax, eax
        je       SHORT G_M61410_IG12
        mov      rdi, r14
        mov      esi, 3
        call     System.Runtime.InteropServices.GCHandle:_InternalAlloc(System.Object,int):nint
        test     rax, rax
        jne      SHORT G_M61410_IG07
        mov      rdi, r14
        mov      esi, 3
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
        call     [rax]System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
 						;; size=64 bbWeight=0.50 PerfScore 7.62
 G_M61410_IG07:
        or       rax, 1
-       add      r14, 16
-       movsxd   rdi, dword ptr [r15+0x08]
-       lea      rdi, [r14+2*rdi]
+       mov      edi, dword ptr [r15+0x08]
+       lea      rdi, bword ptr [r14+2*rdi+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rdi
        mov      qword ptr [rbx+0x10], rax
        jmp      SHORT G_M61410_IG10
-						;; size=31 bbWeight=0.50 PerfScore 5.12
+						;; size=28 bbWeight=0.50 PerfScore 4.25
 G_M61410_IG08:
-       lea      rax, bword ptr [r14+0x10]
-       mov      ecx, dword ptr [r15+0x08]
-       and      ecx, 0xD1FFAB1E
-       movsxd   rcx, ecx
-       lea      rax, [rax+2*rcx]
+       mov      eax, dword ptr [r15+0x08]
+       and      eax, 0xD1FFAB1E
+       lea      rax, bword ptr [r14+2*rax+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rax
-						;; size=30 bbWeight=0.50 PerfScore 2.88
+						;; size=23 bbWeight=0.50 PerfScore 2.75
 G_M61410_IG09:
        mov      qword ptr [rbx+0x10], rcx
 						;; size=4 bbWeight=0.50 PerfScore 0.50
 G_M61410_IG10:
        mov      rax, rbx
 						;; size=3 bbWeight=0.50 PerfScore 0.12
 G_M61410_IG11:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=0.50 PerfScore 1.62
 G_M61410_IG12:
        mov      rdi, 0xD1FFAB1E      ; System.ArgumentException
        call     CORINFO_HELP_NEWSFAST
        mov      r15, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SR:get_ArgumentException_NotIsomorphic():System.String
        call     [rax]System.SR:get_ArgumentException_NotIsomorphic():System.String
-       mov      rbx, rax
+       mov      r14, rax
        mov      edi, 61
        mov      rsi, 0xD1FFAB1E
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_STRCNS
        call     [rax]CORINFO_HELP_STRCNS
        mov      rdx, rax
-       mov      rsi, rbx
+       mov      rsi, r14
        mov      rdi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.ArgumentException:.ctor(System.String,System.String):this
        call     [rax]System.ArgumentException:.ctor(System.String,System.String):this
        mov      rdi, r15
        call     CORINFO_HELP_THROW
        int3     
 						;; size=90 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 319, prolog size 18, PerfScore 38.25, instruction count 89, allocated bytes for code 319 (MethodHash=d4f9101d) for method System.Memory`1[short]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
+; Total bytes of code 309, prolog size 18, PerfScore 37.25, instruction count 86, allocated bytes for code 309 (MethodHash=d4f9101d) for method System.Memory`1[short]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; ============================================================

-10 (-3.13 % of base) - System.Memory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this

 ; Assembly listing for method System.Memory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 5 single block inlinees; 2 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  7,  5   )   byref  ->  r15         this single-def
 ;  V01 RetBuf       [V01,T00] ( 11,  6.50)    long  ->  rbx         single-def
 ;* V02 TypeCtx      [V02    ] (  0,  0   )    long  ->  zero-ref    single-def
 ;  V03 loc0         [V03,T02] (  9,  5.50)     ref  ->  r14         class-hnd single-def <System.Object>
 ;* V04 loc1         [V04    ] (  0,  0   )     ref  ->  zero-ref    class-hnd <System.String>
 ;* V05 loc2         [V05    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V06 loc3         [V06    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op <System.Runtime.InteropServices.GCHandle>
 ;* V07 loc4         [V07    ] (  0,  0   )  struct ( 8) zero-ref    <System.Runtime.InteropServices.GCHandle>
 ;* V08 loc5         [V08    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op <System.Buffers.MemoryHandle>
 ;# V09 OutArgs      [V09    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
 ;* V10 loc7         [V10    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "updating class info" <System.Buffers.MemoryManager`1[System.__Canon]>
 ;* V11 tmp2         [V11    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <System.__Canon[]>
 ;* V12 tmp3         [V12    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;* V13 tmp4         [V13    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "updating class info" <System.__Canon[]>
-;  V14 tmp5         [V14,T05] (  2,  2   )    long  ->  rax         "impAppendStmt"
+;* V14 tmp5         [V14    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;* V15 tmp6         [V15    ] (  0,  0   )  struct (24) zero-ref    ld-addr-op "NewObj constructor temp" <System.Buffers.MemoryHandle>
 ;  V16 tmp7         [V16,T04] (  2,  2   )   byref  ->  rdx         single-def "Inlining Arg"
 ;* V17 tmp8         [V17    ] (  0,  0   )  struct ( 8) zero-ref    "Inlining Arg" <System.Runtime.InteropServices.GCHandle>
 ;* V18 tmp9         [V18    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Runtime.InteropServices.GCHandle>
 ;* V19 tmp10        [V19    ] (  0,  0   )    long  ->  zero-ref    "Inline stloc first use temp"
-;  V20 tmp11        [V20,T11] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
+;  V20 tmp11        [V20,T09] (  3,  0   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.ArgumentException>
 ;  V21 tmp12        [V21,T03] (  4,  2   )    long  ->  rax         "Inline stloc first use temp"
 ;* V22 tmp13        [V22    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V23 tmp14        [V23    ] (  0,  0   )    long  ->  zero-ref    "field V05._handle (fldOffset=0x0)" P-INDEP
 ;* V24 tmp15        [V24    ] (  0,  0   )    long  ->  zero-ref    "field V06._handle (fldOffset=0x0)" P-INDEP
 ;* V25 tmp16        [V25    ] (  0,  0   )    long  ->  zero-ref    "field V07._handle (fldOffset=0x0)" P-INDEP
 ;* V26 tmp17        [V26    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V08._pinnable (fldOffset=0x0)" P-INDEP
 ;* V27 tmp18        [V27    ] (  0,  0   )    long  ->  zero-ref    "field V08._pointer (fldOffset=0x8)" P-INDEP
 ;* V28 tmp19        [V28    ] (  0,  0   )    long  ->  zero-ref    "field V08._handle (fldOffset=0x10)" P-INDEP
 ;* V29 tmp20        [V29    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V12._pinnable (fldOffset=0x0)" P-INDEP
-;  V30 tmp21        [V30,T09] (  2,  1   )    long  ->  rdi         "field V12._pointer (fldOffset=0x8)" P-INDEP
+;* V30 tmp21        [V30    ] (  0,  0   )    long  ->  zero-ref    "field V12._pointer (fldOffset=0x8)" P-INDEP
 ;* V31 tmp22        [V31    ] (  0,  0   )    long  ->  zero-ref    "field V12._handle (fldOffset=0x10)" P-INDEP
 ;* V32 tmp23        [V32    ] (  0,  0   )     ref  ->  zero-ref    single-def "field V15._pinnable (fldOffset=0x0)" P-INDEP
 ;* V33 tmp24        [V33    ] (  0,  0   )    long  ->  zero-ref    "field V15._pointer (fldOffset=0x8)" P-INDEP
 ;* V34 tmp25        [V34    ] (  0,  0   )    long  ->  zero-ref    "field V15._handle (fldOffset=0x10)" P-INDEP
 ;* V35 tmp26        [V35    ] (  0,  0   )    long  ->  zero-ref    "field V17._handle (fldOffset=0x0)" P-INDEP
-;  V36 tmp27        [V36,T10] (  2,  1   )    long  ->  rax         "field V18._handle (fldOffset=0x0)" P-INDEP
-;  V37 tmp28        [V37,T06] (  2,  2   )    long  ->  r14         "Cast away GC"
-;  V38 tmp29        [V38,T12] (  2,  0   )     ref  ->  rbx         single-def "argument with side effect"
-;  V39 tmp30        [V39,T13] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
-;  V40 tmp31        [V40,T07] (  2,  2   )    long  ->  rax         "Cast away GC"
-;  V41 cse0         [V41,T08] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
+;  V36 tmp27        [V36,T08] (  2,  1   )    long  ->  rax         "field V18._handle (fldOffset=0x0)" P-INDEP
+;  V37 tmp28        [V37,T05] (  2,  2   )    long  ->  rdi         "Cast away GC"
+;  V38 tmp29        [V38,T10] (  2,  0   )     ref  ->  r14         single-def "argument with side effect"
+;  V39 tmp30        [V39,T11] (  2,  0   )     ref  ->  rdx         single-def "argument with side effect"
+;  V40 tmp31        [V40,T06] (  2,  2   )    long  ->  rax         "Cast away GC"
+;  V41 cse0         [V41,T07] (  3,  1.50)    long  ->  rax         "CSE #02: moderate"
 ;
 ; Lcl frame size = 8
 
 G_M51638_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
        mov      r15, rdi
        mov      rbx, rsi
 						;; size=18 bbWeight=1 PerfScore 6.00
 G_M51638_IG02:
        mov      r14, gword ptr [r15]
        test     r14, r14
        jne      SHORT G_M51638_IG04
 						;; size=8 bbWeight=1 PerfScore 3.25
 G_M51638_IG03:
        xor      edx, edx
        mov      qword ptr [rbx], rdx
        mov      qword ptr [rbx+0x08], rdx
        mov      qword ptr [rbx+0x10], rdx
        jmp      G_M51638_IG10
 						;; size=18 bbWeight=0.50 PerfScore 2.62
 G_M51638_IG04:
        mov      rax, qword ptr [r14]
        mov      rdx, rax
        test     dword ptr [rdx], 0xD1FFAB1E
        jne      SHORT G_M51638_IG06
        mov      edx, dword ptr [r15+0x08]
        mov      rdi, r14
        mov      rsi, rbx
        mov      rax, qword ptr [rax+0x40]
 						;; size=28 bbWeight=0.50 PerfScore 5.38
 G_M51638_IG05:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        tail.jmp [rax+0x30]System.Buffers.MemoryManager`1[System.__Canon]:Pin(int):System.Buffers.MemoryHandle:this
 						;; size=14 bbWeight=0.50 PerfScore 3.12
 G_M51638_IG06:
        cmp      dword ptr [r15+0x08], 0
        jl       SHORT G_M51638_IG08
        mov      rdi, r14
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        call     [rax]System.Runtime.InteropServices.Marshal:IsPinnable(System.Object):bool
        test     eax, eax
        je       SHORT G_M51638_IG12
        mov      rdi, r14
        mov      esi, 3
        call     System.Runtime.InteropServices.GCHandle:_InternalAlloc(System.Object,int):nint
        test     rax, rax
        jne      SHORT G_M51638_IG07
        mov      rdi, r14
        mov      esi, 3
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
        call     [rax]System.Runtime.InteropServices.GCHandle:InternalAllocWithGCTransition(System.Object,int):nint
 						;; size=64 bbWeight=0.50 PerfScore 7.62
 G_M51638_IG07:
        or       rax, 1
-       add      r14, 16
-       movsxd   rdi, dword ptr [r15+0x08]
-       lea      rdi, [r14+8*rdi]
+       mov      edi, dword ptr [r15+0x08]
+       lea      rdi, bword ptr [r14+8*rdi+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rdi
        mov      qword ptr [rbx+0x10], rax
        jmp      SHORT G_M51638_IG10
-						;; size=31 bbWeight=0.50 PerfScore 5.12
+						;; size=28 bbWeight=0.50 PerfScore 4.25
 G_M51638_IG08:
-       lea      rax, bword ptr [r14+0x10]
-       mov      ecx, dword ptr [r15+0x08]
-       and      ecx, 0xD1FFAB1E
-       movsxd   rcx, ecx
-       lea      rax, [rax+8*rcx]
+       mov      eax, dword ptr [r15+0x08]
+       and      eax, 0xD1FFAB1E
+       lea      rax, bword ptr [r14+8*rax+0x10]
        xor      rcx, rcx
        mov      gword ptr [rbx], rcx
        mov      qword ptr [rbx+0x08], rax
-						;; size=30 bbWeight=0.50 PerfScore 2.88
+						;; size=23 bbWeight=0.50 PerfScore 2.75
 G_M51638_IG09:
        mov      qword ptr [rbx+0x10], rcx
 						;; size=4 bbWeight=0.50 PerfScore 0.50
 G_M51638_IG10:
        mov      rax, rbx
 						;; size=3 bbWeight=0.50 PerfScore 0.12
 G_M51638_IG11:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=0.50 PerfScore 1.62
 G_M51638_IG12:
        mov      rdi, 0xD1FFAB1E      ; System.ArgumentException
        call     CORINFO_HELP_NEWSFAST
        mov      r15, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SR:get_ArgumentException_NotIsomorphic():System.String
        call     [rax]System.SR:get_ArgumentException_NotIsomorphic():System.String
-       mov      rbx, rax
+       mov      r14, rax
        mov      edi, 61
        mov      rsi, 0xD1FFAB1E
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_STRCNS
        call     [rax]CORINFO_HELP_STRCNS
        mov      rdx, rax
-       mov      rsi, rbx
+       mov      rsi, r14
        mov      rdi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.ArgumentException:.ctor(System.String,System.String):this
        call     [rax]System.ArgumentException:.ctor(System.String,System.String):this
        mov      rdi, r15
        call     CORINFO_HELP_THROW
        int3     
 						;; size=90 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 319, prolog size 18, PerfScore 38.25, instruction count 89, allocated bytes for code 319 (MethodHash=cbd83649) for method System.Memory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
+; Total bytes of code 309, prolog size 18, PerfScore 37.25, instruction count 86, allocated bytes for code 309 (MethodHash=cbd83649) for method System.Memory`1[System.__Canon]:Pin():System.Buffers.MemoryHandle:this (FullOpts)
 ; ============================================================

Larger list of diffs: https://gist.github.com/MihuBot/ffb59b14f91cb23fb2b99e8dcb65a364

[MihuBot]

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