[JitDiff X64] [xtqqczze] Refactor memory copies in `SafeBuffer`

[MihuBot]

Job completed in 14 minutes.
dotnet/runtime#105206

Diffs

Found 261 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 39655437
Total bytes of diff: 39654923
Total bytes of delta: -514 (-0.00 % of base)
Total relative delta: -2.06
    diff is an improvement.
    relative diff is an improvement.


Top file improvements (bytes):
        -514 : System.Private.CoreLib.dasm (-0.01 % of base)

1 total files with Code Size differences (1 improved, 0 regressed), 258 unchanged.

Top method regressions (bytes):
          13 (4.42 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[System.Numerics.Vector`1[float]](ulong,System.Span`1[System.Numerics.Vector`1[float]]):this (FullOpts)
          13 (4.42 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[System.Numerics.Vector`1[float]](ulong,System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]):this (FullOpts)

Top method improvements (bytes):
         -45 (-18.83 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[ubyte](ulong):ubyte:this (FullOpts)
         -44 (-18.57 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[int](ulong):int:this (FullOpts)
         -44 (-18.41 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[long](ulong):long:this (FullOpts)
         -44 (-18.41 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[short](ulong):short:this (FullOpts)
         -37 (-15.42 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[double](ulong):double:this (FullOpts)
         -35 (-13.16 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[System.Numerics.Vector`1[float]](ulong):System.Numerics.Vector`1[float]:this (FullOpts)
         -29 (-12.45 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[double](ulong,double):this (FullOpts)
         -25 (-10.78 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[long](ulong,long):this (FullOpts)
         -24 (-10.39 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[int](ulong,int):this (FullOpts)
         -24 (-10.39 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[ubyte](ulong,ubyte):this (FullOpts)
         -23 (-9.96 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[short](ulong,short):this (FullOpts)
         -23 (-10.09 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[System.Numerics.Vector`1[float]](ulong,System.Numerics.Vector`1[float]):this (FullOpts)
         -19 (-6.35 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[long](ulong,System.ReadOnlySpan`1[long]):this (FullOpts)
         -17 (-5.72 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[int](ulong,System.ReadOnlySpan`1[int]):this (FullOpts)
         -17 (-5.69 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[short](ulong,System.ReadOnlySpan`1[short]):this (FullOpts)
         -16 (-5.35 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[long](ulong,System.Span`1[long]):this (FullOpts)
         -16 (-5.39 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[ubyte](ulong,System.ReadOnlySpan`1[ubyte]):this (FullOpts)
         -15 (-5.02 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[double](ulong,System.ReadOnlySpan`1[double]):this (FullOpts)
         -14 (-4.71 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[int](ulong,System.Span`1[int]):this (FullOpts)
         -14 (-4.68 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[short](ulong,System.Span`1[short]):this (FullOpts)
         -13 (-4.38 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[ubyte](ulong,System.Span`1[ubyte]):this (FullOpts)
          -2 (-0.67 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[double](ulong,System.Span`1[double]):this (FullOpts)

Top method regressions (percentages):
          13 (4.42 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[System.Numerics.Vector`1[float]](ulong,System.Span`1[System.Numerics.Vector`1[float]]):this (FullOpts)
          13 (4.42 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[System.Numerics.Vector`1[float]](ulong,System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]):this (FullOpts)

Top method improvements (percentages):
         -45 (-18.83 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[ubyte](ulong):ubyte:this (FullOpts)
         -44 (-18.57 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[int](ulong):int:this (FullOpts)
         -44 (-18.41 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[long](ulong):long:this (FullOpts)
         -44 (-18.41 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[short](ulong):short:this (FullOpts)
         -37 (-15.42 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[double](ulong):double:this (FullOpts)
         -35 (-13.16 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Read[System.Numerics.Vector`1[float]](ulong):System.Numerics.Vector`1[float]:this (FullOpts)
         -29 (-12.45 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[double](ulong,double):this (FullOpts)
         -25 (-10.78 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[long](ulong,long):this (FullOpts)
         -24 (-10.39 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[int](ulong,int):this (FullOpts)
         -24 (-10.39 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[ubyte](ulong,ubyte):this (FullOpts)
         -23 (-10.09 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[System.Numerics.Vector`1[float]](ulong,System.Numerics.Vector`1[float]):this (FullOpts)
         -23 (-9.96 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:Write[short](ulong,short):this (FullOpts)
         -19 (-6.35 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[long](ulong,System.ReadOnlySpan`1[long]):this (FullOpts)
         -17 (-5.72 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[int](ulong,System.ReadOnlySpan`1[int]):this (FullOpts)
         -17 (-5.69 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[short](ulong,System.ReadOnlySpan`1[short]):this (FullOpts)
         -16 (-5.39 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[ubyte](ulong,System.ReadOnlySpan`1[ubyte]):this (FullOpts)
         -16 (-5.35 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[long](ulong,System.Span`1[long]):this (FullOpts)
         -15 (-5.02 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:WriteSpan[double](ulong,System.ReadOnlySpan`1[double]):this (FullOpts)
         -14 (-4.71 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[int](ulong,System.Span`1[int]):this (FullOpts)
         -14 (-4.68 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[short](ulong,System.Span`1[short]):this (FullOpts)
         -13 (-4.38 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[ubyte](ulong,System.Span`1[ubyte]):this (FullOpts)
          -2 (-0.67 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.SafeBuffer:ReadSpan[double](ulong,System.Span`1[double]):this (FullOpts)

24 total methods with Code Size differences (22 improved, 2 regressed), 231354 unchanged.

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

Artifacts:

• build-artifacts-main.zip (653 MB)
• build-clr-checked-main.zip (87 MB)
• build-artifacts-pr.zip (654 MB)
• build-clr-checked-pr.zip (87 MB)
• diff-frameworks.txt (8 KB)
• jit-diffs-frameworks.zip (266 MB)

[MihuBot]

Top method regressions

13 (4.42 % of base) - System.Runtime.InteropServices.SafeBuffer:ReadSpan[System.Numerics.Vector`1[float]](ulong,System.Span`1[System.Numerics.Vector`1[float]]):this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:ReadSpan[System.Numerics.Vector`1[float]](ulong,System.Span`1[System.Numerics.Vector`1[float]]):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 4 single block inlinees; 1 inlinees without PGO data
+; 0 inlinees with PGO data; 4 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T03] (  8,  6.50)     ref  ->  [rbp-0x30]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T06] (  3,  3   )    long  ->  r15         single-def
 ;* V02 arg2         [V02    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.Span`1[System.Numerics.Vector`1[float]]>
 ;  V03 loc0         [V03,T09] (  2,  2   )     int  ->  rax        
 ;  V04 loc1         [V04,T04] (  3,  6   )    long  ->  r15        
 ;  V05 loc2         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x28]  do-not-enreg[X] addr-exposed ld-addr-op
 ;  V06 loc3         [V06,T07] (  2,  5   )   byref  ->  r14         single-def
 ;  V07 loc4         [V07,T00] (  5, 17   )     int  ->  rdi        
 ;# V08 OutArgs      [V08    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V09 tmp1         [V09    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;* V10 tmp2         [V10    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[System.Numerics.Vector`1[float]]>
-;* V11 tmp3         [V11    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V12 tmp4         [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp5         [V13,T08] (  2,  2   )   byref  ->  r14         single-def "field V02._reference (fldOffset=0x0)" P-INDEP
-;  V14 tmp6         [V14,T02] (  4,  7   )     int  ->  rbx         single-def "field V02._length (fldOffset=0x8)" P-INDEP
-;* V15 tmp7         [V15    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V10._reference (fldOffset=0x0)" P-INDEP
-;* V16 tmp8         [V16    ] (  0,  0   )     int  ->  zero-ref    "field V10._length (fldOffset=0x8)" P-INDEP
-;  V17 PSPSym       [V17,T10] (  1,  1   )    long  ->  [rbp-0x40]  do-not-enreg[V] "PSPSym"
-;  V18 cse0         [V18,T05] (  3,  6   )    long  ->  r13         "CSE #01: aggressive"
-;  V19 cse1         [V19,T01] (  3, 12   )    long  ->  rsi         "CSE #02: aggressive"
+;  V11 tmp3         [V11,T08] (  2,  2   )   byref  ->  r14         single-def "field V02._reference (fldOffset=0x0)" P-INDEP
+;  V12 tmp4         [V12,T02] (  4,  7   )     int  ->  rbx         single-def "field V02._length (fldOffset=0x8)" P-INDEP
+;* V13 tmp5         [V13    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V10._reference (fldOffset=0x0)" P-INDEP
+;* V14 tmp6         [V14    ] (  0,  0   )     int  ->  zero-ref    "field V10._length (fldOffset=0x8)" P-INDEP
+;  V15 PSPSym       [V15,T10] (  1,  1   )    long  ->  [rbp-0x40]  do-not-enreg[V] "PSPSym"
+;  V16 cse0         [V16,T05] (  3,  6   )    long  ->  r13         "CSE #01: aggressive"
+;  V17 cse1         [V17,T01] (  3, 12   )    long  ->  rsi         "CSE #02: aggressive"
 ;
 ; Lcl frame size = 32
 
 G_M7477_IG01:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     rbx
        sub      rsp, 32
        lea      rbp, [rsp+0x40]
        mov      qword ptr [rbp-0x40], rsp
        mov      gword ptr [rbp-0x30], rdi
        mov      r15, rsi
        mov      r14, rdx
        mov      ebx, ecx
 						;; size=33 bbWeight=1 PerfScore 8.50
 G_M7477_IG02:
        cmp      qword ptr [rdi+0x18], -1
        je       G_M7477_IG09
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:AlignedSizeOf[System.Numerics.Vector`1[float]]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:AlignedSizeOf[System.Numerics.Vector`1[float]]():uint
        mov      rdi, gword ptr [rbp-0x30]
        add      r15, qword ptr [rdi+0x08]
        mov      r13d, eax
        mov      edx, ebx
        imul     rdx, r13
        jo       G_M7477_IG10
        test     rdx, rdx
        jl       G_M7477_IG10
        mov      rsi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
        mov      dword ptr [rbp-0x28], esi
 						;; size=75 bbWeight=1 PerfScore 20.75
 G_M7477_IG03:
        lea      rsi, [rbp-0x28]
        mov      rdi, gword ptr [rbp-0x30]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        xor      edi, edi
        test     ebx, ebx
        jle      SHORT G_M7477_IG05
-       align    [0 bytes for IG04]
-						;; size=26 bbWeight=1 PerfScore 6.25
+       align    [10 bytes for IG04]
+						;; size=36 bbWeight=1 PerfScore 6.50
 G_M7477_IG04:
-       movsxd   rsi, edi
+       mov      esi, edi
        mov      rax, r13
        imul     rax, rsi
-       add      rax, r15
+       vmovups  ymm0, ymmword ptr [rax+r15]
        shl      rsi, 5
-       add      rsi, r14
-       vmovdqu  ymm0, ymmword ptr [rax]
-       vmovdqu  ymmword ptr [rsi], ymm0
+       vmovups  ymmword ptr [r14+rsi], ymm0
        inc      edi
        cmp      edi, ebx
        jl       SHORT G_M7477_IG04
-						;; size=34 bbWeight=4 PerfScore 48.00
+						;; size=31 bbWeight=4 PerfScore 46.00
 G_M7477_IG05:
        cmp      byte  ptr [rbp-0x28], 0
        je       SHORT G_M7477_IG07
 						;; size=6 bbWeight=1 PerfScore 3.00
 G_M7477_IG06:
        mov      rdi, gword ptr [rbp-0x30]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
 G_M7477_IG07:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
 G_M7477_IG08:
+       vzeroupper 
        add      rsp, 32
        pop      rbx
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=13 bbWeight=1 PerfScore 3.75
+						;; size=16 bbWeight=1 PerfScore 4.75
 G_M7477_IG09:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
 G_M7477_IG10:
        call     CORINFO_HELP_OVERFLOW
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 G_M7477_IG11:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     rbx
        sub      rsp, 16
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
        lea      rbp, [rbp+0x40]
 						;; size=23 bbWeight=0 PerfScore 0.00
 G_M7477_IG12:
        cmp      byte  ptr [rbp-0x28], 0
        je       SHORT G_M7477_IG13
        mov      rdi, gword ptr [rbp-0x30]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
 G_M7477_IG13:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
 G_M7477_IG14:
+       vzeroupper 
        add      rsp, 16
        pop      rbx
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=13 bbWeight=0 PerfScore 0.00
+						;; size=16 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 294, prolog size 33, PerfScore 92.75, instruction count 92, allocated bytes for code 294 (MethodHash=6e36e2ca) for method System.Runtime.InteropServices.SafeBuffer:ReadSpan[System.Numerics.Vector`1[float]](ulong,System.Span`1[System.Numerics.Vector`1[float]]):this (FullOpts)
+; Total bytes of code 307, prolog size 33, PerfScore 92.00, instruction count 92, allocated bytes for code 307 (MethodHash=6e36e2ca) for method System.Runtime.InteropServices.SafeBuffer:ReadSpan[System.Numerics.Vector`1[float]](ulong,System.Span`1[System.Numerics.Vector`1[float]]):this (FullOpts)

13 (4.42 % of base) - System.Runtime.InteropServices.SafeBuffer:WriteSpan[System.Numerics.Vector`1[float]](ulong,System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]):this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:WriteSpan[System.Numerics.Vector`1[float]](ulong,System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 4 single block inlinees; 1 inlinees without PGO data
+; 0 inlinees with PGO data; 4 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T03] (  8,  6.50)     ref  ->  [rbp-0x30]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T06] (  3,  3   )    long  ->  r15         single-def
 ;* V02 arg2         [V02    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]>
 ;  V03 loc0         [V03,T09] (  2,  2   )     int  ->  rax        
 ;  V04 loc1         [V04,T04] (  3,  6   )    long  ->  r15        
 ;  V05 loc2         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x28]  do-not-enreg[X] addr-exposed ld-addr-op
 ;  V06 loc3         [V06,T07] (  2,  5   )   byref  ->  r14         single-def
 ;  V07 loc4         [V07,T00] (  5, 17   )     int  ->  rdi        
 ;# V08 OutArgs      [V08    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V09 tmp1         [V09    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;* V10 tmp2         [V10    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]>
-;* V11 tmp3         [V11    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V12 tmp4         [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp5         [V13,T08] (  2,  2   )   byref  ->  r14         single-def "field V02._reference (fldOffset=0x0)" P-INDEP
-;  V14 tmp6         [V14,T02] (  4,  7   )     int  ->  rbx         single-def "field V02._length (fldOffset=0x8)" P-INDEP
-;* V15 tmp7         [V15    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V10._reference (fldOffset=0x0)" P-INDEP
-;* V16 tmp8         [V16    ] (  0,  0   )     int  ->  zero-ref    "field V10._length (fldOffset=0x8)" P-INDEP
-;  V17 PSPSym       [V17,T10] (  1,  1   )    long  ->  [rbp-0x40]  do-not-enreg[V] "PSPSym"
-;  V18 cse0         [V18,T05] (  3,  6   )    long  ->  r13         "CSE #01: aggressive"
-;  V19 cse1         [V19,T01] (  3, 12   )    long  ->  rsi         "CSE #02: aggressive"
+;  V11 tmp3         [V11,T08] (  2,  2   )   byref  ->  r14         single-def "field V02._reference (fldOffset=0x0)" P-INDEP
+;  V12 tmp4         [V12,T02] (  4,  7   )     int  ->  rbx         single-def "field V02._length (fldOffset=0x8)" P-INDEP
+;* V13 tmp5         [V13    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V10._reference (fldOffset=0x0)" P-INDEP
+;* V14 tmp6         [V14    ] (  0,  0   )     int  ->  zero-ref    "field V10._length (fldOffset=0x8)" P-INDEP
+;  V15 PSPSym       [V15,T10] (  1,  1   )    long  ->  [rbp-0x40]  do-not-enreg[V] "PSPSym"
+;  V16 cse0         [V16,T05] (  3,  6   )    long  ->  r13         "CSE #01: aggressive"
+;  V17 cse1         [V17,T01] (  3, 12   )    long  ->  rsi         "CSE #02: aggressive"
 ;
 ; Lcl frame size = 32
 
 G_M34876_IG01:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     rbx
        sub      rsp, 32
        lea      rbp, [rsp+0x40]
        mov      qword ptr [rbp-0x40], rsp
        mov      gword ptr [rbp-0x30], rdi
        mov      r15, rsi
        mov      r14, rdx
        mov      ebx, ecx
 						;; size=33 bbWeight=1 PerfScore 8.50
 G_M34876_IG02:
        cmp      qword ptr [rdi+0x18], -1
        je       G_M34876_IG09
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:AlignedSizeOf[System.Numerics.Vector`1[float]]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:AlignedSizeOf[System.Numerics.Vector`1[float]]():uint
        mov      rdi, gword ptr [rbp-0x30]
        add      r15, qword ptr [rdi+0x08]
        mov      r13d, eax
        mov      edx, ebx
        imul     rdx, r13
        jo       G_M34876_IG10
        test     rdx, rdx
        jl       G_M34876_IG10
        mov      rsi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
        mov      dword ptr [rbp-0x28], esi
 						;; size=75 bbWeight=1 PerfScore 20.75
 G_M34876_IG03:
        lea      rsi, [rbp-0x28]
        mov      rdi, gword ptr [rbp-0x30]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        xor      edi, edi
        test     ebx, ebx
        jle      SHORT G_M34876_IG05
-       align    [0 bytes for IG04]
-						;; size=26 bbWeight=1 PerfScore 6.25
+       align    [10 bytes for IG04]
+						;; size=36 bbWeight=1 PerfScore 6.50
 G_M34876_IG04:
-       movsxd   rsi, edi
-       mov      rax, r13
-       imul     rax, rsi
-       add      rax, r15
-       shl      rsi, 5
-       add      rsi, r14
-       vmovdqu  ymm0, ymmword ptr [rsi]
-       vmovdqu  ymmword ptr [rax], ymm0
+       mov      esi, edi
+       mov      rax, rsi
+       shl      rax, 5
+       vmovups  ymm0, ymmword ptr [r14+rax]
+       imul     rsi, r13
+       vmovups  ymmword ptr [rsi+r15], ymm0
        inc      edi
        cmp      edi, ebx
        jl       SHORT G_M34876_IG04
-						;; size=34 bbWeight=4 PerfScore 48.00
+						;; size=31 bbWeight=4 PerfScore 46.00
 G_M34876_IG05:
        cmp      byte  ptr [rbp-0x28], 0
        je       SHORT G_M34876_IG07
 						;; size=6 bbWeight=1 PerfScore 3.00
 G_M34876_IG06:
        mov      rdi, gword ptr [rbp-0x30]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
 G_M34876_IG07:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
 G_M34876_IG08:
+       vzeroupper 
        add      rsp, 32
        pop      rbx
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=13 bbWeight=1 PerfScore 3.75
+						;; size=16 bbWeight=1 PerfScore 4.75
 G_M34876_IG09:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
 G_M34876_IG10:
        call     CORINFO_HELP_OVERFLOW
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 G_M34876_IG11:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     rbx
        sub      rsp, 16
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
        lea      rbp, [rbp+0x40]
 						;; size=23 bbWeight=0 PerfScore 0.00
 G_M34876_IG12:
        cmp      byte  ptr [rbp-0x28], 0
        je       SHORT G_M34876_IG13
        mov      rdi, gword ptr [rbp-0x30]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
 G_M34876_IG13:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
 G_M34876_IG14:
+       vzeroupper 
        add      rsp, 16
        pop      rbx
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=13 bbWeight=0 PerfScore 0.00
+						;; size=16 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 294, prolog size 33, PerfScore 92.75, instruction count 92, allocated bytes for code 294 (MethodHash=fab077c3) for method System.Runtime.InteropServices.SafeBuffer:WriteSpan[System.Numerics.Vector`1[float]](ulong,System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]):this (FullOpts)
+; Total bytes of code 307, prolog size 33, PerfScore 92.00, instruction count 92, allocated bytes for code 307 (MethodHash=fab077c3) for method System.Runtime.InteropServices.SafeBuffer:WriteSpan[System.Numerics.Vector`1[float]](ulong,System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]):this (FullOpts)

[MihuBot]

Top method improvements

-45 (-18.83 % of base) - System.Runtime.InteropServices.SafeBuffer:Read[ubyte](ulong):ubyte:this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Read[ubyte](ulong):ubyte:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x28]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x18]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rbx         single-def
-;  V02 loc0         [V02,T02] (  3,  3   )     int  ->  r15        
-;  V03 loc1         [V03,T03] (  3,  3   )    long  ->  rbx        
-;  V04 loc2         [V04    ] (  3,  3   )   ubyte  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
-;  V05 loc3         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V02 loc0         [V02,T03] (  2,  2   )     int  ->  rax        
+;  V03 loc1         [V03,T02] (  3,  3   )    long  ->  rbx        
+;  V04 loc2         [V04    ] (  4,  3   )   ubyte  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V05 loc3         [V05,T04] (  2,  2   )   ubyte  ->  rbx        
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
-;  V08 PSPSym       [V08,T04] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
+;  V08 PSPSym       [V08,T05] (  1,  1   )    long  ->  [rbp-0x20]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 32
+; Lcl frame size = 24
 
 G_M48575_IG01:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 32
-       lea      rbp, [rsp+0x30]
-       mov      qword ptr [rbp-0x30], rsp
-       mov      gword ptr [rbp-0x28], rdi
+       sub      rsp, 24
+       lea      rbp, [rsp+0x20]
+       mov      qword ptr [rbp-0x20], rsp
+       mov      gword ptr [rbp-0x18], rdi
        mov      rbx, rsi
-						;; size=24 bbWeight=1 PerfScore 6.00
+						;; size=22 bbWeight=1 PerfScore 5.00
 G_M48575_IG02:
        cmp      qword ptr [rdi+0x18], -1
-       je       G_M48575_IG08
+       je       SHORT G_M48575_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[ubyte]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[ubyte]():uint
-       mov      r15d, eax
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x18]
        add      rbx, qword ptr [rdi+0x08]
-       mov      edx, r15d
+       mov      edx, eax
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
-       mov      byte  ptr [rbp-0x18], 0
        xor      esi, esi
-       mov      dword ptr [rbp-0x20], esi
-						;; size=61 bbWeight=1 PerfScore 17.50
+       mov      dword ptr [rbp-0x10], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M48575_IG03:
-       lea      rsi, [rbp-0x20]
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rsi, [rbp-0x10]
+       mov      rdi, gword ptr [rbp-0x18]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r15d
-       lea      rdi, [rbp-0x18]
-       mov      rsi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
+       movzx    rbx, byte  ptr [rbx]
+						;; size=23 bbWeight=1 PerfScore 6.75
 G_M48575_IG04:
-       cmp      byte  ptr [rbp-0x20], 0
+       cmp      byte  ptr [rbp-0x10], 0
        je       SHORT G_M48575_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
 G_M48575_IG05:
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
 G_M48575_IG06:
-       movzx    rax, byte  ptr [rbp-0x18]
-						;; size=4 bbWeight=1 PerfScore 1.00
+       mov      eax, ebx
+						;; size=2 bbWeight=1 PerfScore 0.25
 G_M48575_IG07:
-       add      rsp, 32
+       add      rsp, 24
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=1 PerfScore 2.75
+						;; size=7 bbWeight=1 PerfScore 2.25
 G_M48575_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
 G_M48575_IG09:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 16
+       push     rax
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
-       lea      rbp, [rbp+0x30]
-						;; size=19 bbWeight=0 PerfScore 0.00
+       lea      rbp, [rbp+0x20]
+						;; size=14 bbWeight=0 PerfScore 0.00
 G_M48575_IG10:
-       cmp      byte  ptr [rbp-0x20], 0
+       cmp      byte  ptr [rbp-0x10], 0
        je       SHORT G_M48575_IG11
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
 G_M48575_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
 G_M48575_IG12:
-       add      rsp, 16
+       add      rsp, 8
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=0 PerfScore 0.00
+						;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 239, prolog size 24, PerfScore 41.75, instruction count 68, allocated bytes for code 239 (MethodHash=0df04240) for method System.Runtime.InteropServices.SafeBuffer:Read[ubyte](ulong):ubyte:this (FullOpts)
+; Total bytes of code 194, prolog size 22, PerfScore 35.75, instruction count 57, allocated bytes for code 194 (MethodHash=0df04240) for method System.Runtime.InteropServices.SafeBuffer:Read[ubyte](ulong):ubyte:this (FullOpts)

-44 (-18.57 % of base) - System.Runtime.InteropServices.SafeBuffer:Read[int](ulong):int:this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Read[int](ulong):int:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x28]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x18]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rbx         single-def
-;  V02 loc0         [V02,T02] (  3,  3   )     int  ->  r15        
-;  V03 loc1         [V03,T03] (  3,  3   )    long  ->  rbx        
-;  V04 loc2         [V04    ] (  3,  3   )     int  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
-;  V05 loc3         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V02 loc0         [V02,T03] (  2,  2   )     int  ->  rax        
+;  V03 loc1         [V03,T02] (  3,  3   )    long  ->  rbx        
+;  V04 loc2         [V04    ] (  4,  3   )   ubyte  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V05 loc3         [V05,T04] (  2,  2   )     int  ->  rbx        
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
-;  V08 PSPSym       [V08,T04] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
+;  V08 PSPSym       [V08,T05] (  1,  1   )    long  ->  [rbp-0x20]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 32
+; Lcl frame size = 24
 
 G_M1215_IG01:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 32
-       lea      rbp, [rsp+0x30]
-       mov      qword ptr [rbp-0x30], rsp
-       mov      gword ptr [rbp-0x28], rdi
+       sub      rsp, 24
+       lea      rbp, [rsp+0x20]
+       mov      qword ptr [rbp-0x20], rsp
+       mov      gword ptr [rbp-0x18], rdi
        mov      rbx, rsi
-						;; size=24 bbWeight=1 PerfScore 6.00
+						;; size=22 bbWeight=1 PerfScore 5.00
 G_M1215_IG02:
        cmp      qword ptr [rdi+0x18], -1
-       je       G_M1215_IG09
+       je       SHORT G_M1215_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[int]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[int]():uint
-       mov      r15d, eax
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x18]
        add      rbx, qword ptr [rdi+0x08]
-       mov      edx, r15d
+       mov      edx, eax
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
-       mov      dword ptr [rbp-0x18], esi
-						;; size=57 bbWeight=1 PerfScore 16.50
+       mov      dword ptr [rbp-0x10], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M1215_IG03:
-       mov      dword ptr [rbp-0x20], esi
-						;; size=3 bbWeight=1 PerfScore 1.00
-G_M1215_IG04:
-       lea      rsi, [rbp-0x20]
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rsi, [rbp-0x10]
+       mov      rdi, gword ptr [rbp-0x18]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r15d
-       lea      rdi, [rbp-0x18]
-       mov      rsi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
-G_M1215_IG05:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M1215_IG07
+       mov      ebx, dword ptr [rbx]
+						;; size=22 bbWeight=1 PerfScore 6.75
+G_M1215_IG04:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M1215_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
-G_M1215_IG06:
-       mov      rdi, gword ptr [rbp-0x28]
+G_M1215_IG05:
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
+G_M1215_IG06:
+       mov      eax, ebx
+						;; size=2 bbWeight=1 PerfScore 0.25
 G_M1215_IG07:
-       mov      eax, dword ptr [rbp-0x18]
-						;; size=3 bbWeight=1 PerfScore 1.00
-G_M1215_IG08:
-       add      rsp, 32
+       add      rsp, 24
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=1 PerfScore 2.75
-G_M1215_IG09:
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M1215_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
-G_M1215_IG10:
+G_M1215_IG09:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 16
+       push     rax
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
-       lea      rbp, [rbp+0x30]
-						;; size=19 bbWeight=0 PerfScore 0.00
-G_M1215_IG11:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M1215_IG12
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rbp, [rbp+0x20]
+						;; size=14 bbWeight=0 PerfScore 0.00
+G_M1215_IG10:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M1215_IG11
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
-G_M1215_IG12:
+G_M1215_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
-G_M1215_IG13:
-       add      rsp, 16
+G_M1215_IG12:
+       add      rsp, 8
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=0 PerfScore 0.00
+						;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 237, prolog size 24, PerfScore 41.75, instruction count 68, allocated bytes for code 237 (MethodHash=84fefb40) for method System.Runtime.InteropServices.SafeBuffer:Read[int](ulong):int:this (FullOpts)
+; Total bytes of code 193, prolog size 22, PerfScore 35.75, instruction count 57, allocated bytes for code 193 (MethodHash=84fefb40) for method System.Runtime.InteropServices.SafeBuffer:Read[int](ulong):int:this (FullOpts)

-44 (-18.41 % of base) - System.Runtime.InteropServices.SafeBuffer:Read[long](ulong):long:this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Read[long](ulong):long:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x28]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x18]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rbx         single-def
-;  V02 loc0         [V02,T02] (  3,  3   )     int  ->  r15        
-;  V03 loc1         [V03,T03] (  3,  3   )    long  ->  rbx        
-;  V04 loc2         [V04    ] (  3,  3   )    long  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
-;  V05 loc3         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V02 loc0         [V02,T03] (  2,  2   )     int  ->  rax        
+;  V03 loc1         [V03,T02] (  3,  3   )    long  ->  rbx        
+;  V04 loc2         [V04    ] (  4,  3   )   ubyte  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V05 loc3         [V05,T04] (  2,  2   )    long  ->  rbx        
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
-;  V08 PSPSym       [V08,T04] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
+;  V08 PSPSym       [V08,T05] (  1,  1   )    long  ->  [rbp-0x20]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 32
+; Lcl frame size = 24
 
 G_M44191_IG01:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 32
-       lea      rbp, [rsp+0x30]
-       mov      qword ptr [rbp-0x30], rsp
-       mov      gword ptr [rbp-0x28], rdi
+       sub      rsp, 24
+       lea      rbp, [rsp+0x20]
+       mov      qword ptr [rbp-0x20], rsp
+       mov      gword ptr [rbp-0x18], rdi
        mov      rbx, rsi
-						;; size=24 bbWeight=1 PerfScore 6.00
+						;; size=22 bbWeight=1 PerfScore 5.00
 G_M44191_IG02:
        cmp      qword ptr [rdi+0x18], -1
-       je       G_M44191_IG09
+       je       SHORT G_M44191_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[long]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[long]():uint
-       mov      r15d, eax
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x18]
        add      rbx, qword ptr [rdi+0x08]
-       mov      edx, r15d
+       mov      edx, eax
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
-       mov      qword ptr [rbp-0x18], rsi
-						;; size=58 bbWeight=1 PerfScore 16.50
+       mov      dword ptr [rbp-0x10], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M44191_IG03:
-       mov      dword ptr [rbp-0x20], esi
-						;; size=3 bbWeight=1 PerfScore 1.00
-G_M44191_IG04:
-       lea      rsi, [rbp-0x20]
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rsi, [rbp-0x10]
+       mov      rdi, gword ptr [rbp-0x18]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r15d
-       lea      rdi, [rbp-0x18]
-       mov      rsi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
-G_M44191_IG05:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M44191_IG07
+       mov      rbx, qword ptr [rbx]
+						;; size=23 bbWeight=1 PerfScore 6.75
+G_M44191_IG04:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M44191_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
-G_M44191_IG06:
-       mov      rdi, gword ptr [rbp-0x28]
+G_M44191_IG05:
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
+G_M44191_IG06:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
 G_M44191_IG07:
-       mov      rax, qword ptr [rbp-0x18]
-						;; size=4 bbWeight=1 PerfScore 1.00
-G_M44191_IG08:
-       add      rsp, 32
+       add      rsp, 24
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=1 PerfScore 2.75
-G_M44191_IG09:
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M44191_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
-G_M44191_IG10:
+G_M44191_IG09:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 16
+       push     rax
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
-       lea      rbp, [rbp+0x30]
-						;; size=19 bbWeight=0 PerfScore 0.00
-G_M44191_IG11:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M44191_IG12
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rbp, [rbp+0x20]
+						;; size=14 bbWeight=0 PerfScore 0.00
+G_M44191_IG10:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M44191_IG11
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
-G_M44191_IG12:
+G_M44191_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
-G_M44191_IG13:
-       add      rsp, 16
+G_M44191_IG12:
+       add      rsp, 8
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=0 PerfScore 0.00
+						;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 239, prolog size 24, PerfScore 41.75, instruction count 68, allocated bytes for code 239 (MethodHash=99115360) for method System.Runtime.InteropServices.SafeBuffer:Read[long](ulong):long:this (FullOpts)
+; Total bytes of code 195, prolog size 22, PerfScore 35.75, instruction count 57, allocated bytes for code 195 (MethodHash=99115360) for method System.Runtime.InteropServices.SafeBuffer:Read[long](ulong):long:this (FullOpts)

-44 (-18.41 % of base) - System.Runtime.InteropServices.SafeBuffer:Read[short](ulong):short:this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Read[short](ulong):short:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x28]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x18]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rbx         single-def
-;  V02 loc0         [V02,T02] (  3,  3   )     int  ->  r15        
-;  V03 loc1         [V03,T03] (  3,  3   )    long  ->  rbx        
-;  V04 loc2         [V04    ] (  3,  3   )   short  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
-;  V05 loc3         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V02 loc0         [V02,T03] (  2,  2   )     int  ->  rax        
+;  V03 loc1         [V03,T02] (  3,  3   )    long  ->  rbx        
+;  V04 loc2         [V04    ] (  4,  3   )   ubyte  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V05 loc3         [V05,T04] (  2,  2   )   short  ->  rbx        
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
-;  V08 PSPSym       [V08,T04] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
+;  V08 PSPSym       [V08,T05] (  1,  1   )    long  ->  [rbp-0x20]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 32
+; Lcl frame size = 24
 
 G_M14975_IG01:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 32
-       lea      rbp, [rsp+0x30]
-       mov      qword ptr [rbp-0x30], rsp
-       mov      gword ptr [rbp-0x28], rdi
+       sub      rsp, 24
+       lea      rbp, [rsp+0x20]
+       mov      qword ptr [rbp-0x20], rsp
+       mov      gword ptr [rbp-0x18], rdi
        mov      rbx, rsi
-						;; size=24 bbWeight=1 PerfScore 6.00
+						;; size=22 bbWeight=1 PerfScore 5.00
 G_M14975_IG02:
        cmp      qword ptr [rdi+0x18], -1
-       je       G_M14975_IG09
+       je       SHORT G_M14975_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[short]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[short]():uint
-       mov      r15d, eax
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x18]
        add      rbx, qword ptr [rdi+0x08]
-       mov      edx, r15d
+       mov      edx, eax
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
-       mov      dword ptr [rbp-0x18], esi
-						;; size=57 bbWeight=1 PerfScore 16.50
+       mov      dword ptr [rbp-0x10], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M14975_IG03:
-       mov      dword ptr [rbp-0x20], esi
-						;; size=3 bbWeight=1 PerfScore 1.00
-G_M14975_IG04:
-       lea      rsi, [rbp-0x20]
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rsi, [rbp-0x10]
+       mov      rdi, gword ptr [rbp-0x18]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r15d
-       lea      rdi, [rbp-0x18]
-       mov      rsi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
-G_M14975_IG05:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M14975_IG07
+       movsx    rbx, word  ptr [rbx]
+						;; size=24 bbWeight=1 PerfScore 8.75
+G_M14975_IG04:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M14975_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
-G_M14975_IG06:
-       mov      rdi, gword ptr [rbp-0x28]
+G_M14975_IG05:
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
+G_M14975_IG06:
+       mov      eax, ebx
+						;; size=2 bbWeight=1 PerfScore 0.25
 G_M14975_IG07:
-       movsx    rax, word  ptr [rbp-0x18]
-						;; size=5 bbWeight=1 PerfScore 3.00
-G_M14975_IG08:
-       add      rsp, 32
+       add      rsp, 24
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=1 PerfScore 2.75
-G_M14975_IG09:
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M14975_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
-G_M14975_IG10:
+G_M14975_IG09:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 16
+       push     rax
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
-       lea      rbp, [rbp+0x30]
-						;; size=19 bbWeight=0 PerfScore 0.00
-G_M14975_IG11:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M14975_IG12
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rbp, [rbp+0x20]
+						;; size=14 bbWeight=0 PerfScore 0.00
+G_M14975_IG10:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M14975_IG11
+       mov      rdi, gword ptr [rbp-0x18]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
-G_M14975_IG12:
+G_M14975_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
-G_M14975_IG13:
-       add      rsp, 16
+G_M14975_IG12:
+       add      rsp, 8
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=0 PerfScore 0.00
+						;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 239, prolog size 24, PerfScore 43.75, instruction count 68, allocated bytes for code 239 (MethodHash=291bc580) for method System.Runtime.InteropServices.SafeBuffer:Read[short](ulong):short:this (FullOpts)
+; Total bytes of code 195, prolog size 22, PerfScore 37.75, instruction count 57, allocated bytes for code 195 (MethodHash=291bc580) for method System.Runtime.InteropServices.SafeBuffer:Read[short](ulong):short:this (FullOpts)

-37 (-15.42 % of base) - System.Runtime.InteropServices.SafeBuffer:Read[double](ulong):double:this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Read[double](ulong):double:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x28]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x20]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rbx         single-def
-;  V02 loc0         [V02,T02] (  3,  3   )     int  ->  r15        
-;  V03 loc1         [V03,T03] (  3,  3   )    long  ->  rbx        
-;  V04 loc2         [V04    ] (  3,  3   )  double  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
-;  V05 loc3         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V02 loc0         [V02,T03] (  2,  2   )     int  ->  rax        
+;  V03 loc1         [V03,T02] (  3,  3   )    long  ->  rbx        
+;  V04 loc2         [V04    ] (  4,  3   )   ubyte  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V05 loc3         [V05,T05] (  2,  2   )  double  ->  [rbp-0x18]  spill-single-def
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;  V08 PSPSym       [V08,T04] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 32
+; Lcl frame size = 40
 
 G_M25535_IG01:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 32
+       sub      rsp, 40
        lea      rbp, [rsp+0x30]
        mov      qword ptr [rbp-0x30], rsp
-       mov      gword ptr [rbp-0x28], rdi
+       mov      gword ptr [rbp-0x20], rdi
        mov      rbx, rsi
-						;; size=24 bbWeight=1 PerfScore 6.00
+						;; size=22 bbWeight=1 PerfScore 5.00
 G_M25535_IG02:
        cmp      qword ptr [rdi+0x18], -1
-       je       G_M25535_IG09
+       je       SHORT G_M25535_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[double]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[double]():uint
-       mov      r15d, eax
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x20]
        add      rbx, qword ptr [rdi+0x08]
-       mov      edx, r15d
+       mov      edx, eax
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
-       mov      qword ptr [rbp-0x18], rsi
-						;; size=58 bbWeight=1 PerfScore 16.50
+       mov      dword ptr [rbp-0x10], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M25535_IG03:
-       mov      dword ptr [rbp-0x20], esi
-						;; size=3 bbWeight=1 PerfScore 1.00
-G_M25535_IG04:
-       lea      rsi, [rbp-0x20]
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rsi, [rbp-0x10]
+       mov      rdi, gword ptr [rbp-0x20]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r15d
-       lea      rdi, [rbp-0x18]
-       mov      rsi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
-G_M25535_IG05:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M25535_IG07
+       vmovsd   xmm0, qword ptr [rbx]
+       vmovsd   qword ptr [rbp-0x18], xmm0
+						;; size=29 bbWeight=1 PerfScore 9.75
+G_M25535_IG04:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M25535_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
-G_M25535_IG06:
-       mov      rdi, gword ptr [rbp-0x28]
+G_M25535_IG05:
+       mov      rdi, gword ptr [rbp-0x20]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
-G_M25535_IG07:
+G_M25535_IG06:
        vmovsd   xmm0, qword ptr [rbp-0x18]
 						;; size=5 bbWeight=1 PerfScore 3.00
-G_M25535_IG08:
-       add      rsp, 32
+G_M25535_IG07:
+       add      rsp, 40
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=1 PerfScore 2.75
-G_M25535_IG09:
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M25535_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
-G_M25535_IG10:
+G_M25535_IG09:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 16
+       push     rax
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
        lea      rbp, [rbp+0x30]
-						;; size=19 bbWeight=0 PerfScore 0.00
-G_M25535_IG11:
-       cmp      byte  ptr [rbp-0x20], 0
-       je       SHORT G_M25535_IG12
-       mov      rdi, gword ptr [rbp-0x28]
+						;; size=14 bbWeight=0 PerfScore 0.00
+G_M25535_IG10:
+       cmp      byte  ptr [rbp-0x10], 0
+       je       SHORT G_M25535_IG11
+       mov      rdi, gword ptr [rbp-0x20]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
-G_M25535_IG12:
+G_M25535_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
-G_M25535_IG13:
-       add      rsp, 16
+G_M25535_IG12:
+       add      rsp, 8
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=0 PerfScore 0.00
+						;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 240, prolog size 24, PerfScore 43.75, instruction count 68, allocated bytes for code 240 (MethodHash=da8b9c40) for method System.Runtime.InteropServices.SafeBuffer:Read[double](ulong):double:this (FullOpts)
+; Total bytes of code 203, prolog size 22, PerfScore 41.50, instruction count 58, allocated bytes for code 203 (MethodHash=da8b9c40) for method System.Runtime.InteropServices.SafeBuffer:Read[double](ulong):double:this (FullOpts)

-35 (-13.16 % of base) - System.Runtime.InteropServices.SafeBuffer:Read[System.Numerics.Vector`1[float]](ulong):System.Numerics.Vector`1[float]:this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Read[System.Numerics.Vector`1[float]](ulong):System.Numerics.Vector`1[float]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x60]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x58]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 RetBuf       [V01,T01] (  4,  4   )   byref  ->  rbx         single-def
 ;  V02 arg1         [V02,T02] (  3,  3   )    long  ->  r15         single-def
-;  V03 loc0         [V03,T03] (  3,  3   )     int  ->  r14        
-;  V04 loc1         [V04,T04] (  3,  3   )    long  ->  r15        
-;  V05 loc2         [V05    ] (  3,  3   )  simd32  ->  [rbp-0x50]  do-not-enreg[XS] addr-exposed ld-addr-op <System.Numerics.Vector`1[float]>
-;  V06 loc3         [V06    ] (  4,  3   )   ubyte  ->  [rbp-0x58]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V03 loc0         [V03,T04] (  2,  2   )     int  ->  rax        
+;  V04 loc1         [V04,T03] (  3,  3   )    long  ->  r15        
+;  V05 loc2         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V06 loc3         [V06,T06] (  2,  2   )  simd32  ->  [rbp-0x50]  spill-single-def <System.Numerics.Vector`1[float]>
 ;# V07 OutArgs      [V07    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V08 tmp1         [V08    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
-;  V09 PSPSym       [V09,T05] (  1,  1   )    long  ->  [rbp-0x70]  do-not-enreg[V] "PSPSym"
+;  V09 PSPSym       [V09,T05] (  1,  1   )    long  ->  [rbp-0x60]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 88
+; Lcl frame size = 80
 
 G_M13951_IG01:
        push     rbp
        push     r15
-       push     r14
        push     rbx
-       sub      rsp, 88
-       lea      rbp, [rsp+0x70]
-       mov      qword ptr [rbp-0x70], rsp
-       mov      gword ptr [rbp-0x60], rdi
+       sub      rsp, 80
+       lea      rbp, [rsp+0x60]
+       mov      qword ptr [rbp-0x60], rsp
+       mov      gword ptr [rbp-0x58], rdi
        mov      rbx, rsi
        mov      r15, rdx
-						;; size=29 bbWeight=1 PerfScore 7.25
+						;; size=27 bbWeight=1 PerfScore 6.25
 G_M13951_IG02:
        cmp      qword ptr [rdi+0x18], -1
-       je       G_M13951_IG08
+       je       SHORT G_M13951_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[System.Numerics.Vector`1[float]]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[System.Numerics.Vector`1[float]]():uint
-       mov      r14d, eax
-       mov      rdi, gword ptr [rbp-0x60]
+       mov      rdi, gword ptr [rbp-0x58]
        add      r15, qword ptr [rdi+0x08]
-       mov      edx, r14d
+       mov      edx, eax
        mov      rsi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
-       vxorps   ymm0, ymm0, ymm0
-       vmovups  ymmword ptr [rbp-0x50], ymm0
        xor      esi, esi
-       mov      dword ptr [rbp-0x58], esi
-						;; size=66 bbWeight=1 PerfScore 17.83
+       mov      dword ptr [rbp-0x18], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M13951_IG03:
-       lea      rsi, [rbp-0x58]
-       mov      rdi, gword ptr [rbp-0x60]
+       lea      rsi, [rbp-0x18]
+       mov      rdi, gword ptr [rbp-0x58]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r14d
-       lea      rdi, [rbp-0x50]
-       mov      rsi, r15
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
+       vmovups  ymm0, ymmword ptr [r15]
+       vmovups  ymmword ptr [rbp-0x50], ymm0
+						;; size=30 bbWeight=1 PerfScore 10.75
 G_M13951_IG04:
-       cmp      byte  ptr [rbp-0x58], 0
+       cmp      byte  ptr [rbp-0x18], 0
        je       SHORT G_M13951_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
 G_M13951_IG05:
-       mov      rdi, gword ptr [rbp-0x60]
+       mov      rdi, gword ptr [rbp-0x58]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
 G_M13951_IG06:
        vmovups  ymm0, ymmword ptr [rbp-0x50]
        vmovups  ymmword ptr [rbx], ymm0
        mov      rax, rbx
 						;; size=12 bbWeight=1 PerfScore 6.25
 G_M13951_IG07:
        vzeroupper 
-       add      rsp, 88
+       add      rsp, 80
        pop      rbx
-       pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=14 bbWeight=1 PerfScore 4.25
+						;; size=12 bbWeight=1 PerfScore 3.75
 G_M13951_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
 G_M13951_IG09:
        push     rbp
        push     r15
-       push     r14
        push     rbx
-       push     rax
+       sub      rsp, 16
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
-       lea      rbp, [rbp+0x70]
-						;; size=18 bbWeight=0 PerfScore 0.00
+       lea      rbp, [rbp+0x60]
+						;; size=19 bbWeight=0 PerfScore 0.00
 G_M13951_IG10:
-       cmp      byte  ptr [rbp-0x58], 0
+       cmp      byte  ptr [rbp-0x18], 0
        je       SHORT G_M13951_IG11
-       mov      rdi, gword ptr [rbp-0x60]
+       mov      rdi, gword ptr [rbp-0x58]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
 G_M13951_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
 G_M13951_IG12:
        vzeroupper 
-       add      rsp, 8
+       add      rsp, 16
        pop      rbx
-       pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=14 bbWeight=0 PerfScore 0.00
+						;; size=12 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 266, prolog size 29, PerfScore 50.08, instruction count 78, allocated bytes for code 266 (MethodHash=990ac980) for method System.Runtime.InteropServices.SafeBuffer:Read[System.Numerics.Vector`1[float]](ulong):System.Numerics.Vector`1[float]:this (FullOpts)
+; Total bytes of code 231, prolog size 27, PerfScore 48.50, instruction count 67, allocated bytes for code 231 (MethodHash=990ac980) for method System.Runtime.InteropServices.SafeBuffer:Read[System.Numerics.Vector`1[float]](ulong):System.Numerics.Vector`1[float]:this (FullOpts)

-29 (-12.45 % of base) - System.Runtime.InteropServices.SafeBuffer:Write[double](ulong,double):this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Write[double](ulong,double):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x28]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x20]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rbx         single-def
-;  V02 arg2         [V02    ] (  3,  3   )  double  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op single-def
-;  V03 loc0         [V03,T02] (  3,  3   )     int  ->  r15        
-;  V04 loc1         [V04,T03] (  3,  3   )    long  ->  rbx        
-;  V05 loc2         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V02 arg2         [V02,T05] (  3,  3   )  double  ->  [rbp-0x10]  single-def
+;  V03 loc0         [V03,T03] (  2,  2   )     int  ->  rax        
+;  V04 loc1         [V04,T02] (  3,  3   )    long  ->  rbx        
+;  V05 loc2         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
 ;  V08 PSPSym       [V08,T04] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
 ;
-; Lcl frame size = 32
+; Lcl frame size = 40
 
 G_M55238_IG01:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 32
+       sub      rsp, 40
        lea      rbp, [rsp+0x30]
        mov      qword ptr [rbp-0x30], rsp
-       mov      gword ptr [rbp-0x28], rdi
-       vmovsd   qword ptr [rbp-0x18], xmm0
+       mov      gword ptr [rbp-0x20], rdi
+       vmovsd   qword ptr [rbp-0x10], xmm0
        mov      rbx, rsi
-						;; size=29 bbWeight=1 PerfScore 7.00
+						;; size=27 bbWeight=1 PerfScore 6.00
 G_M55238_IG02:
        cmp      qword ptr [rdi+0x18], -1
        je       SHORT G_M55238_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[double]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[double]():uint
-       mov      r15d, eax
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x20]
        add      rbx, qword ptr [rdi+0x08]
-       mov      edx, r15d
+       mov      edx, eax
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
-       mov      dword ptr [rbp-0x20], esi
-						;; size=53 bbWeight=1 PerfScore 16.50
+       mov      dword ptr [rbp-0x18], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M55238_IG03:
-       lea      rsi, [rbp-0x20]
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rsi, [rbp-0x18]
+       mov      rdi, gword ptr [rbp-0x20]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r15d
-       lea      rsi, [rbp-0x18]
-       mov      rdi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
+       vmovsd   xmm0, qword ptr [rbp-0x10]
+       vmovsd   qword ptr [rbx], xmm0
+						;; size=29 bbWeight=1 PerfScore 9.75
 G_M55238_IG04:
-       cmp      byte  ptr [rbp-0x20], 0
+       cmp      byte  ptr [rbp-0x18], 0
        je       SHORT G_M55238_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
 G_M55238_IG05:
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x20]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
 G_M55238_IG06:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
 G_M55238_IG07:
-       add      rsp, 32
+       add      rsp, 40
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=1 PerfScore 2.75
+						;; size=7 bbWeight=1 PerfScore 2.25
 G_M55238_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
 G_M55238_IG09:
        push     rbp
-       push     r15
        push     rbx
-       sub      rsp, 16
+       push     rax
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
        lea      rbp, [rbp+0x30]
-						;; size=19 bbWeight=0 PerfScore 0.00
+						;; size=14 bbWeight=0 PerfScore 0.00
 G_M55238_IG10:
-       cmp      byte  ptr [rbp-0x20], 0
+       cmp      byte  ptr [rbp-0x18], 0
        je       SHORT G_M55238_IG11
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x20]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
 G_M55238_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
 G_M55238_IG12:
-       add      rsp, 16
+       add      rsp, 8
        pop      rbx
-       pop      r15
        pop      rbp
        ret      
-						;; size=9 bbWeight=0 PerfScore 0.00
+						;; size=7 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 233, prolog size 29, PerfScore 41.00, instruction count 68, allocated bytes for code 233 (MethodHash=67b02839) for method System.Runtime.InteropServices.SafeBuffer:Write[double](ulong,double):this (FullOpts)
+; Total bytes of code 204, prolog size 27, PerfScore 39.75, instruction count 59, allocated bytes for code 204 (MethodHash=67b02839) for method System.Runtime.InteropServices.SafeBuffer:Write[double](ulong,double):this (FullOpts)

-25 (-10.78 % of base) - System.Runtime.InteropServices.SafeBuffer:Write[long](ulong,long):this

 ; Assembly listing for method System.Runtime.InteropServices.SafeBuffer:Write[long](ulong,long):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x28]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
+;  V00 this         [V00,T00] (  8,  6.50)     ref  ->  [rbp-0x20]  this class-hnd EH-live single-def <System.Runtime.InteropServices.SafeBuffer>
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rbx         single-def
-;  V02 arg2         [V02    ] (  3,  3   )    long  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op single-def
-;  V03 loc0         [V03,T02] (  3,  3   )     int  ->  r15        
+;  V02 arg2         [V02,T02] (  3,  3   )    long  ->  r15         single-def
+;  V03 loc0         [V03,T04] (  2,  2   )     int  ->  rax        
 ;  V04 loc1         [V04,T03] (  3,  3   )    long  ->  rbx        
-;  V05 loc2         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op
+;  V05 loc2         [V05    ] (  4,  3   )   ubyte  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op
 ;# V06 OutArgs      [V06    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V07 tmp1         [V07    ] (  0,  0   )    long  ->  zero-ref    "impAppendStmt"
-;  V08 PSPSym       [V08,T04] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
+;  V08 PSPSym       [V08,T05] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[V] "PSPSym"
 ;
 ; Lcl frame size = 32
 
 G_M39494_IG01:
        push     rbp
        push     r15
        push     rbx
        sub      rsp, 32
        lea      rbp, [rsp+0x30]
        mov      qword ptr [rbp-0x30], rsp
-       mov      gword ptr [rbp-0x28], rdi
-       mov      qword ptr [rbp-0x18], rdx
+       mov      gword ptr [rbp-0x20], rdi
        mov      rbx, rsi
-						;; size=28 bbWeight=1 PerfScore 7.00
+       mov      r15, rdx
+						;; size=27 bbWeight=1 PerfScore 6.25
 G_M39494_IG02:
        cmp      qword ptr [rdi+0x18], -1
        je       SHORT G_M39494_IG08
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SizeOf[long]():uint
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SizeOf[long]():uint
-       mov      r15d, eax
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x20]
        add      rbx, qword ptr [rdi+0x08]
-       mov      edx, r15d
+       mov      edx, eax
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        call     [rax]System.Runtime.InteropServices.SafeBuffer:SpaceCheck(ulong,ulong):this
        xor      esi, esi
-       mov      dword ptr [rbp-0x20], esi
-						;; size=53 bbWeight=1 PerfScore 16.50
+       mov      dword ptr [rbp-0x18], esi
+						;; size=49 bbWeight=1 PerfScore 16.25
 G_M39494_IG03:
-       lea      rsi, [rbp-0x20]
-       mov      rdi, gword ptr [rbp-0x28]
+       lea      rsi, [rbp-0x18]
+       mov      rdi, gword ptr [rbp-0x20]
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:DangerousAddRef(byref):this
-       mov      edx, r15d
-       lea      rsi, [rbp-0x18]
-       mov      rdi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
-       call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-       nop      
-						;; size=43 bbWeight=1 PerfScore 9.25
+       mov      qword ptr [rbx], r15
+						;; size=23 bbWeight=1 PerfScore 5.75
 G_M39494_IG04:
-       cmp      byte  ptr [rbp-0x20], 0
+       cmp      byte  ptr [rbp-0x18], 0
        je       SHORT G_M39494_IG06
 						;; size=6 bbWeight=1 PerfScore 3.00
 G_M39494_IG05:
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x20]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=18 bbWeight=0.50 PerfScore 2.25
 G_M39494_IG06:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
 G_M39494_IG07:
        add      rsp, 32
        pop      rbx
        pop      r15
        pop      rbp
        ret      
 						;; size=9 bbWeight=1 PerfScore 2.75
 G_M39494_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        call     [rax]System.Runtime.InteropServices.SafeBuffer:NotInitialized():System.InvalidOperationException
        mov      rdi, rax
        call     CORINFO_HELP_THROW
        int3     
 						;; size=21 bbWeight=0 PerfScore 0.00
 G_M39494_IG09:
        push     rbp
        push     r15
        push     rbx
        sub      rsp, 16
        mov      rbp, qword ptr [rdi]
        mov      qword ptr [rsp], rbp
        lea      rbp, [rbp+0x30]
 						;; size=19 bbWeight=0 PerfScore 0.00
 G_M39494_IG10:
-       cmp      byte  ptr [rbp-0x20], 0
+       cmp      byte  ptr [rbp-0x18], 0
        je       SHORT G_M39494_IG11
-       mov      rdi, gword ptr [rbp-0x28]
+       mov      rdi, gword ptr [rbp-0x20]
        xor      esi, esi
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
        call     [rax]System.Runtime.InteropServices.SafeHandle:InternalRelease(ubyte):this
 						;; size=24 bbWeight=0 PerfScore 0.00
 G_M39494_IG11:
        nop      
 						;; size=1 bbWeight=0 PerfScore 0.00
 G_M39494_IG12:
        add      rsp, 16
        pop      rbx
        pop      r15
        pop      rbp
        ret      
 						;; size=9 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 232, prolog size 28, PerfScore 41.00, instruction count 68, allocated bytes for code 232 (MethodHash=59f965b9) for method System.Runtime.InteropServices.SafeBuffer:Write[long](ulong,long):this (FullOpts)
+; Total bytes of code 207, prolog size 27, PerfScore 36.50, instruction count 62, allocated bytes for code 207 (MethodHash=59f965b9) for method System.Runtime.InteropServices.SafeBuffer:Write[long](ulong,long):this (FullOpts)

Larger list of diffs: https://gist.github.com/MihuBot/b3639a64f40ce798f1a8105e2ee156e3

[MihuBot]

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