[JitDiff X64] [xtqqczze] Use `Unsafe.BitCast` for generic span casting

[MihuBot]

Job completed in 18 minutes 53 seconds.
dotnet/runtime#109136

Diffs

Found 261 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 39563404
Total bytes of diff: 39563630
Total bytes of delta: 226 (0.00 % of base)
Total relative delta: -2.81
    diff is a regression.
    relative diff is an improvement.


Top file regressions (bytes):
         226 : System.Private.CoreLib.dasm (0.00 % of base)

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

Top method regressions (bytes):
         644 (26.30 % of base) : System.Private.CoreLib.dasm - System.Enum:GetValuesAsUnderlyingType(System.RuntimeType):System.Array (FullOpts)
           3 (0.05 % of base) : System.Private.CoreLib.dasm - System.DateTimeFormat:FormatCustomized[ubyte](System.DateTime,System.ReadOnlySpan`1[ushort],System.Globalization.DateTimeFormatInfo,System.TimeSpan,byref) (FullOpts)

Top method improvements (bytes):
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[int]():int[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[double]():double[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[long]():long[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[int]():int[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -23 (-16.91 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[short]():short[]:this (FullOpts)
         -23 (-16.91 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[short]():short[]:this (FullOpts)
         -23 (-16.91 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[short]():short[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[double]():double[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[int]():int[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[long]():long[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -20 (-15.38 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
         -20 (-15.38 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
         -20 (-15.38 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
         -19 (-14.73 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
          -7 (-2.78 % of base) : System.Private.CoreLib.dasm - System.DateTimeFormat:AppendChar[ubyte](byref,ushort) (FullOpts)
          -2 (-0.31 % of base) : System.Private.CoreLib.dasm - System.DateTimeFormat:ParseQuoteString[ubyte](System.ReadOnlySpan`1[ushort],int,byref):int (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[double]():double[]:this (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[int]():int[]:this (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[long]():long[]:this (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)

Top method regressions (percentages):
         644 (26.30 % of base) : System.Private.CoreLib.dasm - System.Enum:GetValuesAsUnderlyingType(System.RuntimeType):System.Array (FullOpts)
           3 (0.05 % of base) : System.Private.CoreLib.dasm - System.DateTimeFormat:FormatCustomized[ubyte](System.DateTime,System.ReadOnlySpan`1[ushort],System.Globalization.DateTimeFormatInfo,System.TimeSpan,byref) (FullOpts)

Top method improvements (percentages):
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[int]():int[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[double]():double[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[long]():long[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[int]():int[]:this (FullOpts)
         -24 (-17.39 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -23 (-16.91 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[short]():short[]:this (FullOpts)
         -23 (-16.91 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[short]():short[]:this (FullOpts)
         -23 (-16.91 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[short]():short[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[double]():double[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[int]():int[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[long]():long[]:this (FullOpts)
         -23 (-16.79 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
         -20 (-15.38 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[double]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
         -20 (-15.38 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[int]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
         -20 (-15.38 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[long]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
         -19 (-14.73 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[short]:CloneValues[ubyte]():ubyte[]:this (FullOpts)
          -7 (-2.78 % of base) : System.Private.CoreLib.dasm - System.DateTimeFormat:AppendChar[ubyte](byref,ushort) (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[double]():double[]:this (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[int]():int[]:this (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[long]():long[]:this (FullOpts)
          -1 (-0.87 % of base) : System.Private.CoreLib.dasm - System.Enum+EnumInfo`1[ubyte]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
          -2 (-0.31 % of base) : System.Private.CoreLib.dasm - System.DateTimeFormat:ParseQuoteString[ubyte](System.ReadOnlySpan`1[ushort],int,byref):int (FullOpts)

26 total methods with Code Size differences (24 improved, 2 regressed), 232637 unchanged.

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

Artifacts:

• build-clr-checked-main.zip (94 MB)
• build-artifacts-main.zip (692 MB)
• build-clr-checked-pr.zip (94 MB)
• build-artifacts-pr.zip (694 MB)
• jit-diffs-main.zip (134 MB)
• jit-diffs-pr.zip (134 MB)
• diff-frameworks.txt (8 KB)
• ShortDiffsRegressions.md (107 B)
• LongDiffsRegressions.md (349 KB)
• ShortDiffsImprovements.md (53 KB)
• LongDiffsImprovements.md (171 KB)

[MihuBot]

Top method regressions

Note: some changes were skipped as they were too large to fit into a comment.

Larger list of diffs: https://gist.github.com/MihuBot/ff49f60f1de570e9a97a5ca7f254f660

[MihuBot]

Top method improvements

-24 (-17.39 % of base) - System.Enum+EnumInfo`1[double]:CloneValues[int]():int[]:this

 ; Assembly listing for method System.Enum+EnumInfo`1[double]:CloneValues[int]():int[]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 4 inlinees without PGO data
+; 0 inlinees with PGO data; 2 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Enum+EnumInfo`1[double]>
-;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[int]>
+;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.ReadOnlySpan`1[int]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V03 tmp1         [V03    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[double]>
-;  V04 tmp2         [V04,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <double[]>
-;* V05 tmp3         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[double]>
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V07 tmp5         [V07    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V08 tmp6         [V08    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[double]>
-;* V09 tmp7         [V09    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;  V10 tmp8         [V10,T02] (  4,  3   )     int  ->  r15         "Inline stloc first use temp"
-;* V11 tmp9         [V11    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
-;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp11        [V13,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <int[]>
-;  V14 tmp12        [V14,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <int[]>
-;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V17 tmp15        [V17    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
-;* V21 tmp19        [V21    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
-;  V22 tmp20        [V22,T05] (  3,  2   )   byref  ->  rbx         "field V05._reference (fldOffset=0x0)" P-INDEP
-;  V23 tmp21        [V23,T06] (  3,  2   )     int  ->  rsi         "field V05._length (fldOffset=0x8)" P-INDEP
-;  V24 tmp22        [V24,T07] (  2,  1.50)   byref  ->  rbx         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;* V25 tmp23        [V25    ] (  0,  0   )     int  ->  zero-ref    "field V08._length (fldOffset=0x8)" P-INDEP
-;* V26 tmp24        [V26    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
-;* V27 tmp25        [V27    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
+;  V03 tmp1         [V03,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <double[]>
+;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[double]>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <int[]>
+;  V06 tmp4         [V06,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <int[]>
+;* V07 tmp5         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V08 tmp6         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V09 tmp7         [V09    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
+;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V11 tmp9         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;  V12 tmp10        [V12,T05] (  3,  1.50)   byref  ->  rbx         "field V04._reference (fldOffset=0x0)" P-INDEP
+;  V13 tmp11        [V13,T02] (  5,  3   )     int  ->  r15         "field V04._length (fldOffset=0x8)" P-INDEP
 ;
 ; Lcl frame size = 8
 
 G_M792_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
 						;; size=12 bbWeight=1 PerfScore 5.50
 G_M792_IG02:
        mov      rsi, gword ptr [rdi+0x08]
        test     rsi, rsi
        je       SHORT G_M792_IG04
 						;; size=9 bbWeight=1 PerfScore 3.25
 G_M792_IG03:
        lea      rbx, bword ptr [rsi+0x10]
-       mov      esi, dword ptr [rsi+0x08]
+       mov      r15d, dword ptr [rsi+0x08]
        jmp      SHORT G_M792_IG05
-						;; size=9 bbWeight=0.50 PerfScore 2.25
+						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M792_IG04:
        xor      rbx, rbx
-       xor      esi, esi
-						;; size=4 bbWeight=0.50 PerfScore 0.25
+       xor      r15d, r15d
+						;; size=5 bbWeight=0.50 PerfScore 0.25
 G_M792_IG05:
-       mov      r15d, esi
-       shl      r15, 3
-       shr      r15, 2
-       cmp      r15, 0xD1FFAB1E
-       ja       SHORT G_M792_IG09
        test     r15d, r15d
        je       SHORT G_M792_IG07
-						;; size=25 bbWeight=1 PerfScore 3.75
+						;; size=5 bbWeight=1 PerfScore 1.25
 G_M792_IG06:
-       movsxd   rsi, r15d
+       mov      esi, r15d
        mov      rdi, 0xD1FFAB1E      ; int[]
        call     CORINFO_HELP_NEWARR_1_VC
        mov      r14, rax
        mov      edx, r15d
        shl      rdx, 2
        lea      rdi, bword ptr [r14+0x10]
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rax, r14
        jmp      SHORT G_M792_IG08
 						;; size=52 bbWeight=0.50 PerfScore 4.38
 G_M792_IG07:
        mov      rax, 0xD1FFAB1E      ; 'System.Int32[]'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M792_IG08:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
-G_M792_IG09:
-       call     CORINFO_HELP_OVERFLOW
-       int3     
-						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 138, prolog size 12, PerfScore 22.75, instruction count 42, allocated bytes for code 138 (MethodHash=7719fce7) for method System.Enum+EnumInfo`1[double]:CloneValues[int]():int[]:this (FullOpts)
+; Total bytes of code 114, prolog size 12, PerfScore 20.25, instruction count 35, allocated bytes for code 114 (MethodHash=7719fce7) for method System.Enum+EnumInfo`1[double]:CloneValues[int]():int[]:this (FullOpts)
 ; ============================================================

-24 (-17.39 % of base) - System.Enum+EnumInfo`1[double]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this

 ; Assembly listing for method System.Enum+EnumInfo`1[double]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 4 inlinees without PGO data
+; 0 inlinees with PGO data; 2 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Enum+EnumInfo`1[double]>
-;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[System.Numerics.Vector`1[float]]>
+;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V03 tmp1         [V03    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[double]>
-;  V04 tmp2         [V04,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <double[]>
-;* V05 tmp3         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[double]>
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V07 tmp5         [V07    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V08 tmp6         [V08    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[double]>
-;* V09 tmp7         [V09    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;  V10 tmp8         [V10,T02] (  4,  3   )     int  ->  r15         "Inline stloc first use temp"
-;* V11 tmp9         [V11    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[System.Numerics.Vector`1[float]]>
-;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp11        [V13,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <System.Numerics.Vector`1[float][]>
-;  V14 tmp12        [V14,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <System.Numerics.Vector`1[float][]>
-;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V17 tmp15        [V17    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
-;* V21 tmp19        [V21    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
-;  V22 tmp20        [V22,T05] (  3,  2   )   byref  ->  rbx         "field V05._reference (fldOffset=0x0)" P-INDEP
-;  V23 tmp21        [V23,T06] (  3,  2   )     int  ->  rsi         "field V05._length (fldOffset=0x8)" P-INDEP
-;  V24 tmp22        [V24,T07] (  2,  1.50)   byref  ->  rbx         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;* V25 tmp23        [V25    ] (  0,  0   )     int  ->  zero-ref    "field V08._length (fldOffset=0x8)" P-INDEP
-;* V26 tmp24        [V26    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
-;* V27 tmp25        [V27    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
+;  V03 tmp1         [V03,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <double[]>
+;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[double]>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <System.Numerics.Vector`1[float][]>
+;  V06 tmp4         [V06,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <System.Numerics.Vector`1[float][]>
+;* V07 tmp5         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V08 tmp6         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V09 tmp7         [V09    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
+;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V11 tmp9         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;  V12 tmp10        [V12,T05] (  3,  1.50)   byref  ->  rbx         "field V04._reference (fldOffset=0x0)" P-INDEP
+;  V13 tmp11        [V13,T02] (  5,  3   )     int  ->  r15         "field V04._length (fldOffset=0x8)" P-INDEP
 ;
 ; Lcl frame size = 8
 
 G_M34328_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
 						;; size=12 bbWeight=1 PerfScore 5.50
 G_M34328_IG02:
        mov      rsi, gword ptr [rdi+0x08]
        test     rsi, rsi
        je       SHORT G_M34328_IG04
 						;; size=9 bbWeight=1 PerfScore 3.25
 G_M34328_IG03:
        lea      rbx, bword ptr [rsi+0x10]
-       mov      esi, dword ptr [rsi+0x08]
+       mov      r15d, dword ptr [rsi+0x08]
        jmp      SHORT G_M34328_IG05
-						;; size=9 bbWeight=0.50 PerfScore 2.25
+						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M34328_IG04:
        xor      rbx, rbx
-       xor      esi, esi
-						;; size=4 bbWeight=0.50 PerfScore 0.25
+       xor      r15d, r15d
+						;; size=5 bbWeight=0.50 PerfScore 0.25
 G_M34328_IG05:
-       mov      r15d, esi
-       shl      r15, 3
-       shr      r15, 5
-       cmp      r15, 0xD1FFAB1E
-       ja       SHORT G_M34328_IG09
        test     r15d, r15d
        je       SHORT G_M34328_IG07
-						;; size=25 bbWeight=1 PerfScore 3.75
+						;; size=5 bbWeight=1 PerfScore 1.25
 G_M34328_IG06:
-       movsxd   rsi, r15d
+       mov      esi, r15d
        mov      rdi, 0xD1FFAB1E      ; System.Numerics.Vector`1[float][]
        call     CORINFO_HELP_NEWARR_1_VC
        mov      r14, rax
        mov      edx, r15d
        shl      rdx, 5
        lea      rdi, bword ptr [r14+0x10]
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rax, r14
        jmp      SHORT G_M34328_IG08
 						;; size=52 bbWeight=0.50 PerfScore 4.38
 G_M34328_IG07:
        mov      rax, 0xD1FFAB1E      ; 'System.Numerics.Vector`1[System.Single][]'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M34328_IG08:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
-G_M34328_IG09:
-       call     CORINFO_HELP_OVERFLOW
-       int3     
-						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 138, prolog size 12, PerfScore 22.75, instruction count 42, allocated bytes for code 138 (MethodHash=9f3479e7) for method System.Enum+EnumInfo`1[double]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
+; Total bytes of code 114, prolog size 12, PerfScore 20.25, instruction count 35, allocated bytes for code 114 (MethodHash=9f3479e7) for method System.Enum+EnumInfo`1[double]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
 ; ============================================================

-24 (-17.39 % of base) - System.Enum+EnumInfo`1[int]:CloneValues[double]():double[]:this

 ; Assembly listing for method System.Enum+EnumInfo`1[int]:CloneValues[double]():double[]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 4 inlinees without PGO data
+; 0 inlinees with PGO data; 2 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Enum+EnumInfo`1[int]>
-;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[double]>
+;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.ReadOnlySpan`1[double]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V03 tmp1         [V03    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[int]>
-;  V04 tmp2         [V04,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <int[]>
-;* V05 tmp3         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V07 tmp5         [V07    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V08 tmp6         [V08    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[int]>
-;* V09 tmp7         [V09    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;  V10 tmp8         [V10,T02] (  4,  3   )     int  ->  r15         "Inline stloc first use temp"
-;* V11 tmp9         [V11    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[double]>
-;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp11        [V13,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <double[]>
-;  V14 tmp12        [V14,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <double[]>
-;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V17 tmp15        [V17    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
-;* V21 tmp19        [V21    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
-;  V22 tmp20        [V22,T05] (  3,  2   )   byref  ->  rbx         "field V05._reference (fldOffset=0x0)" P-INDEP
-;  V23 tmp21        [V23,T06] (  3,  2   )     int  ->  rsi         "field V05._length (fldOffset=0x8)" P-INDEP
-;  V24 tmp22        [V24,T07] (  2,  1.50)   byref  ->  rbx         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;* V25 tmp23        [V25    ] (  0,  0   )     int  ->  zero-ref    "field V08._length (fldOffset=0x8)" P-INDEP
-;* V26 tmp24        [V26    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
-;* V27 tmp25        [V27    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
+;  V03 tmp1         [V03,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <int[]>
+;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[int]>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <double[]>
+;  V06 tmp4         [V06,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <double[]>
+;* V07 tmp5         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V08 tmp6         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V09 tmp7         [V09    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
+;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V11 tmp9         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;  V12 tmp10        [V12,T05] (  3,  1.50)   byref  ->  rbx         "field V04._reference (fldOffset=0x0)" P-INDEP
+;  V13 tmp11        [V13,T02] (  5,  3   )     int  ->  r15         "field V04._length (fldOffset=0x8)" P-INDEP
 ;
 ; Lcl frame size = 8
 
 G_M44254_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
 						;; size=12 bbWeight=1 PerfScore 5.50
 G_M44254_IG02:
        mov      rsi, gword ptr [rdi+0x08]
        test     rsi, rsi
        je       SHORT G_M44254_IG04
 						;; size=9 bbWeight=1 PerfScore 3.25
 G_M44254_IG03:
        lea      rbx, bword ptr [rsi+0x10]
-       mov      esi, dword ptr [rsi+0x08]
+       mov      r15d, dword ptr [rsi+0x08]
        jmp      SHORT G_M44254_IG05
-						;; size=9 bbWeight=0.50 PerfScore 2.25
+						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M44254_IG04:
        xor      rbx, rbx
-       xor      esi, esi
-						;; size=4 bbWeight=0.50 PerfScore 0.25
+       xor      r15d, r15d
+						;; size=5 bbWeight=0.50 PerfScore 0.25
 G_M44254_IG05:
-       mov      r15d, esi
-       shl      r15, 2
-       shr      r15, 3
-       cmp      r15, 0xD1FFAB1E
-       ja       SHORT G_M44254_IG09
        test     r15d, r15d
        je       SHORT G_M44254_IG07
-						;; size=25 bbWeight=1 PerfScore 3.75
+						;; size=5 bbWeight=1 PerfScore 1.25
 G_M44254_IG06:
-       movsxd   rsi, r15d
+       mov      esi, r15d
        mov      rdi, 0xD1FFAB1E      ; double[]
        call     CORINFO_HELP_NEWARR_1_VC
        mov      r14, rax
        mov      edx, r15d
        shl      rdx, 3
        lea      rdi, bword ptr [r14+0x10]
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rax, r14
        jmp      SHORT G_M44254_IG08
 						;; size=52 bbWeight=0.50 PerfScore 4.38
 G_M44254_IG07:
        mov      rax, 0xD1FFAB1E      ; 'System.Double[]'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M44254_IG08:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
-G_M44254_IG09:
-       call     CORINFO_HELP_OVERFLOW
-       int3     
-						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 138, prolog size 12, PerfScore 22.75, instruction count 42, allocated bytes for code 138 (MethodHash=6bb45321) for method System.Enum+EnumInfo`1[int]:CloneValues[double]():double[]:this (FullOpts)
+; Total bytes of code 114, prolog size 12, PerfScore 20.25, instruction count 35, allocated bytes for code 114 (MethodHash=6bb45321) for method System.Enum+EnumInfo`1[int]:CloneValues[double]():double[]:this (FullOpts)
 ; ============================================================

-24 (-17.39 % of base) - System.Enum+EnumInfo`1[int]:CloneValues[long]():long[]:this

 ; Assembly listing for method System.Enum+EnumInfo`1[int]:CloneValues[long]():long[]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 4 inlinees without PGO data
+; 0 inlinees with PGO data; 2 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Enum+EnumInfo`1[int]>
-;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[long]>
+;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.ReadOnlySpan`1[long]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V03 tmp1         [V03    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[int]>
-;  V04 tmp2         [V04,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <int[]>
-;* V05 tmp3         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V07 tmp5         [V07    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V08 tmp6         [V08    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[int]>
-;* V09 tmp7         [V09    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;  V10 tmp8         [V10,T02] (  4,  3   )     int  ->  r15         "Inline stloc first use temp"
-;* V11 tmp9         [V11    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[long]>
-;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp11        [V13,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <long[]>
-;  V14 tmp12        [V14,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <long[]>
-;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V17 tmp15        [V17    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
-;* V21 tmp19        [V21    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
-;  V22 tmp20        [V22,T05] (  3,  2   )   byref  ->  rbx         "field V05._reference (fldOffset=0x0)" P-INDEP
-;  V23 tmp21        [V23,T06] (  3,  2   )     int  ->  rsi         "field V05._length (fldOffset=0x8)" P-INDEP
-;  V24 tmp22        [V24,T07] (  2,  1.50)   byref  ->  rbx         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;* V25 tmp23        [V25    ] (  0,  0   )     int  ->  zero-ref    "field V08._length (fldOffset=0x8)" P-INDEP
-;* V26 tmp24        [V26    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
-;* V27 tmp25        [V27    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
+;  V03 tmp1         [V03,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <int[]>
+;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[int]>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <long[]>
+;  V06 tmp4         [V06,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <long[]>
+;* V07 tmp5         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V08 tmp6         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V09 tmp7         [V09    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
+;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V11 tmp9         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;  V12 tmp10        [V12,T05] (  3,  1.50)   byref  ->  rbx         "field V04._reference (fldOffset=0x0)" P-INDEP
+;  V13 tmp11        [V13,T02] (  5,  3   )     int  ->  r15         "field V04._length (fldOffset=0x8)" P-INDEP
 ;
 ; Lcl frame size = 8
 
 G_M64478_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
 						;; size=12 bbWeight=1 PerfScore 5.50
 G_M64478_IG02:
        mov      rsi, gword ptr [rdi+0x08]
        test     rsi, rsi
        je       SHORT G_M64478_IG04
 						;; size=9 bbWeight=1 PerfScore 3.25
 G_M64478_IG03:
        lea      rbx, bword ptr [rsi+0x10]
-       mov      esi, dword ptr [rsi+0x08]
+       mov      r15d, dword ptr [rsi+0x08]
        jmp      SHORT G_M64478_IG05
-						;; size=9 bbWeight=0.50 PerfScore 2.25
+						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M64478_IG04:
        xor      rbx, rbx
-       xor      esi, esi
-						;; size=4 bbWeight=0.50 PerfScore 0.25
+       xor      r15d, r15d
+						;; size=5 bbWeight=0.50 PerfScore 0.25
 G_M64478_IG05:
-       mov      r15d, esi
-       shl      r15, 2
-       shr      r15, 3
-       cmp      r15, 0xD1FFAB1E
-       ja       SHORT G_M64478_IG09
        test     r15d, r15d
        je       SHORT G_M64478_IG07
-						;; size=25 bbWeight=1 PerfScore 3.75
+						;; size=5 bbWeight=1 PerfScore 1.25
 G_M64478_IG06:
-       movsxd   rsi, r15d
+       mov      esi, r15d
        mov      rdi, 0xD1FFAB1E      ; long[]
        call     CORINFO_HELP_NEWARR_1_VC
        mov      r14, rax
        mov      edx, r15d
        shl      rdx, 3
        lea      rdi, bword ptr [r14+0x10]
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rax, r14
        jmp      SHORT G_M64478_IG08
 						;; size=52 bbWeight=0.50 PerfScore 4.38
 G_M64478_IG07:
        mov      rax, 0xD1FFAB1E      ; 'System.Int64[]'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M64478_IG08:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
-G_M64478_IG09:
-       call     CORINFO_HELP_OVERFLOW
-       int3     
-						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 138, prolog size 12, PerfScore 22.75, instruction count 42, allocated bytes for code 138 (MethodHash=10b20421) for method System.Enum+EnumInfo`1[int]:CloneValues[long]():long[]:this (FullOpts)
+; Total bytes of code 114, prolog size 12, PerfScore 20.25, instruction count 35, allocated bytes for code 114 (MethodHash=10b20421) for method System.Enum+EnumInfo`1[int]:CloneValues[long]():long[]:this (FullOpts)
 ; ============================================================

-24 (-17.39 % of base) - System.Enum+EnumInfo`1[int]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this

 ; Assembly listing for method System.Enum+EnumInfo`1[int]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 4 inlinees without PGO data
+; 0 inlinees with PGO data; 2 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Enum+EnumInfo`1[int]>
-;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[System.Numerics.Vector`1[float]]>
+;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V03 tmp1         [V03    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[int]>
-;  V04 tmp2         [V04,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <int[]>
-;* V05 tmp3         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V07 tmp5         [V07    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V08 tmp6         [V08    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[int]>
-;* V09 tmp7         [V09    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;  V10 tmp8         [V10,T02] (  4,  3   )     int  ->  r15         "Inline stloc first use temp"
-;* V11 tmp9         [V11    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[System.Numerics.Vector`1[float]]>
-;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp11        [V13,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <System.Numerics.Vector`1[float][]>
-;  V14 tmp12        [V14,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <System.Numerics.Vector`1[float][]>
-;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V17 tmp15        [V17    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
-;* V21 tmp19        [V21    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
-;  V22 tmp20        [V22,T05] (  3,  2   )   byref  ->  rbx         "field V05._reference (fldOffset=0x0)" P-INDEP
-;  V23 tmp21        [V23,T06] (  3,  2   )     int  ->  rsi         "field V05._length (fldOffset=0x8)" P-INDEP
-;  V24 tmp22        [V24,T07] (  2,  1.50)   byref  ->  rbx         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;* V25 tmp23        [V25    ] (  0,  0   )     int  ->  zero-ref    "field V08._length (fldOffset=0x8)" P-INDEP
-;* V26 tmp24        [V26    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
-;* V27 tmp25        [V27    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
+;  V03 tmp1         [V03,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <int[]>
+;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[int]>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <System.Numerics.Vector`1[float][]>
+;  V06 tmp4         [V06,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <System.Numerics.Vector`1[float][]>
+;* V07 tmp5         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V08 tmp6         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V09 tmp7         [V09    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
+;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V11 tmp9         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;  V12 tmp10        [V12,T05] (  3,  1.50)   byref  ->  rbx         "field V04._reference (fldOffset=0x0)" P-INDEP
+;  V13 tmp11        [V13,T02] (  5,  3   )     int  ->  r15         "field V04._length (fldOffset=0x8)" P-INDEP
 ;
 ; Lcl frame size = 8
 
 G_M4350_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
 						;; size=12 bbWeight=1 PerfScore 5.50
 G_M4350_IG02:
        mov      rsi, gword ptr [rdi+0x08]
        test     rsi, rsi
        je       SHORT G_M4350_IG04
 						;; size=9 bbWeight=1 PerfScore 3.25
 G_M4350_IG03:
        lea      rbx, bword ptr [rsi+0x10]
-       mov      esi, dword ptr [rsi+0x08]
+       mov      r15d, dword ptr [rsi+0x08]
        jmp      SHORT G_M4350_IG05
-						;; size=9 bbWeight=0.50 PerfScore 2.25
+						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M4350_IG04:
        xor      rbx, rbx
-       xor      esi, esi
-						;; size=4 bbWeight=0.50 PerfScore 0.25
+       xor      r15d, r15d
+						;; size=5 bbWeight=0.50 PerfScore 0.25
 G_M4350_IG05:
-       mov      r15d, esi
-       shl      r15, 2
-       shr      r15, 5
-       cmp      r15, 0xD1FFAB1E
-       ja       SHORT G_M4350_IG09
        test     r15d, r15d
        je       SHORT G_M4350_IG07
-						;; size=25 bbWeight=1 PerfScore 3.75
+						;; size=5 bbWeight=1 PerfScore 1.25
 G_M4350_IG06:
-       movsxd   rsi, r15d
+       mov      esi, r15d
        mov      rdi, 0xD1FFAB1E      ; System.Numerics.Vector`1[float][]
        call     CORINFO_HELP_NEWARR_1_VC
        mov      r14, rax
        mov      edx, r15d
        shl      rdx, 5
        lea      rdi, bword ptr [r14+0x10]
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rax, r14
        jmp      SHORT G_M4350_IG08
 						;; size=52 bbWeight=0.50 PerfScore 4.38
 G_M4350_IG07:
        mov      rax, 0xD1FFAB1E      ; 'System.Numerics.Vector`1[System.Single][]'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M4350_IG08:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
-G_M4350_IG09:
-       call     CORINFO_HELP_OVERFLOW
-       int3     
-						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 138, prolog size 12, PerfScore 22.75, instruction count 42, allocated bytes for code 138 (MethodHash=4129ef01) for method System.Enum+EnumInfo`1[int]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
+; Total bytes of code 114, prolog size 12, PerfScore 20.25, instruction count 35, allocated bytes for code 114 (MethodHash=4129ef01) for method System.Enum+EnumInfo`1[int]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
 ; ============================================================

-24 (-17.39 % of base) - System.Enum+EnumInfo`1[long]:CloneValues[int]():int[]:this

 ; Assembly listing for method System.Enum+EnumInfo`1[long]:CloneValues[int]():int[]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 4 inlinees without PGO data
+; 0 inlinees with PGO data; 2 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Enum+EnumInfo`1[long]>
-;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[int]>
+;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.ReadOnlySpan`1[int]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V03 tmp1         [V03    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[long]>
-;  V04 tmp2         [V04,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <long[]>
-;* V05 tmp3         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[long]>
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V07 tmp5         [V07    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V08 tmp6         [V08    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[long]>
-;* V09 tmp7         [V09    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;  V10 tmp8         [V10,T02] (  4,  3   )     int  ->  r15         "Inline stloc first use temp"
-;* V11 tmp9         [V11    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
-;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp11        [V13,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <int[]>
-;  V14 tmp12        [V14,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <int[]>
-;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V17 tmp15        [V17    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
-;* V21 tmp19        [V21    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
-;  V22 tmp20        [V22,T05] (  3,  2   )   byref  ->  rbx         "field V05._reference (fldOffset=0x0)" P-INDEP
-;  V23 tmp21        [V23,T06] (  3,  2   )     int  ->  rsi         "field V05._length (fldOffset=0x8)" P-INDEP
-;  V24 tmp22        [V24,T07] (  2,  1.50)   byref  ->  rbx         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;* V25 tmp23        [V25    ] (  0,  0   )     int  ->  zero-ref    "field V08._length (fldOffset=0x8)" P-INDEP
-;* V26 tmp24        [V26    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
-;* V27 tmp25        [V27    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
+;  V03 tmp1         [V03,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <long[]>
+;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[long]>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <int[]>
+;  V06 tmp4         [V06,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <int[]>
+;* V07 tmp5         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V08 tmp6         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V09 tmp7         [V09    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
+;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V11 tmp9         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;  V12 tmp10        [V12,T05] (  3,  1.50)   byref  ->  rbx         "field V04._reference (fldOffset=0x0)" P-INDEP
+;  V13 tmp11        [V13,T02] (  5,  3   )     int  ->  r15         "field V04._length (fldOffset=0x8)" P-INDEP
 ;
 ; Lcl frame size = 8
 
 G_M41863_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
 						;; size=12 bbWeight=1 PerfScore 5.50
 G_M41863_IG02:
        mov      rsi, gword ptr [rdi+0x08]
        test     rsi, rsi
        je       SHORT G_M41863_IG04
 						;; size=9 bbWeight=1 PerfScore 3.25
 G_M41863_IG03:
        lea      rbx, bword ptr [rsi+0x10]
-       mov      esi, dword ptr [rsi+0x08]
+       mov      r15d, dword ptr [rsi+0x08]
        jmp      SHORT G_M41863_IG05
-						;; size=9 bbWeight=0.50 PerfScore 2.25
+						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M41863_IG04:
        xor      rbx, rbx
-       xor      esi, esi
-						;; size=4 bbWeight=0.50 PerfScore 0.25
+       xor      r15d, r15d
+						;; size=5 bbWeight=0.50 PerfScore 0.25
 G_M41863_IG05:
-       mov      r15d, esi
-       shl      r15, 3
-       shr      r15, 2
-       cmp      r15, 0xD1FFAB1E
-       ja       SHORT G_M41863_IG09
        test     r15d, r15d
        je       SHORT G_M41863_IG07
-						;; size=25 bbWeight=1 PerfScore 3.75
+						;; size=5 bbWeight=1 PerfScore 1.25
 G_M41863_IG06:
-       movsxd   rsi, r15d
+       mov      esi, r15d
        mov      rdi, 0xD1FFAB1E      ; int[]
        call     CORINFO_HELP_NEWARR_1_VC
        mov      r14, rax
        mov      edx, r15d
        shl      rdx, 2
        lea      rdi, bword ptr [r14+0x10]
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rax, r14
        jmp      SHORT G_M41863_IG08
 						;; size=52 bbWeight=0.50 PerfScore 4.38
 G_M41863_IG07:
        mov      rax, 0xD1FFAB1E      ; 'System.Int32[]'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M41863_IG08:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
-G_M41863_IG09:
-       call     CORINFO_HELP_OVERFLOW
-       int3     
-						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 138, prolog size 12, PerfScore 22.75, instruction count 42, allocated bytes for code 138 (MethodHash=d1c45c78) for method System.Enum+EnumInfo`1[long]:CloneValues[int]():int[]:this (FullOpts)
+; Total bytes of code 114, prolog size 12, PerfScore 20.25, instruction count 35, allocated bytes for code 114 (MethodHash=d1c45c78) for method System.Enum+EnumInfo`1[long]:CloneValues[int]():int[]:this (FullOpts)
 ; ============================================================

-24 (-17.39 % of base) - System.Enum+EnumInfo`1[long]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this

 ; Assembly listing for method System.Enum+EnumInfo`1[long]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 4 inlinees without PGO data
+; 0 inlinees with PGO data; 2 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T01] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Enum+EnumInfo`1[long]>
-;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[System.Numerics.Vector`1[float]]>
+;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.ReadOnlySpan`1[System.Numerics.Vector`1[float]]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;* V03 tmp1         [V03    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[long]>
-;  V04 tmp2         [V04,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <long[]>
-;* V05 tmp3         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[long]>
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V07 tmp5         [V07    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;* V08 tmp6         [V08    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[long]>
-;* V09 tmp7         [V09    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
-;  V10 tmp8         [V10,T02] (  4,  3   )     int  ->  r15         "Inline stloc first use temp"
-;* V11 tmp9         [V11    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[System.Numerics.Vector`1[float]]>
-;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V13 tmp11        [V13,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <System.Numerics.Vector`1[float][]>
-;  V14 tmp12        [V14,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <System.Numerics.Vector`1[float][]>
-;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V17 tmp15        [V17    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;* V20 tmp18        [V20    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
-;* V21 tmp19        [V21    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
-;  V22 tmp20        [V22,T05] (  3,  2   )   byref  ->  rbx         "field V05._reference (fldOffset=0x0)" P-INDEP
-;  V23 tmp21        [V23,T06] (  3,  2   )     int  ->  rsi         "field V05._length (fldOffset=0x8)" P-INDEP
-;  V24 tmp22        [V24,T07] (  2,  1.50)   byref  ->  rbx         single-def "field V08._reference (fldOffset=0x0)" P-INDEP
-;* V25 tmp23        [V25    ] (  0,  0   )     int  ->  zero-ref    "field V08._length (fldOffset=0x8)" P-INDEP
-;* V26 tmp24        [V26    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
-;* V27 tmp25        [V27    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
+;  V03 tmp1         [V03,T00] (  4,  6   )     ref  ->  rsi         class-hnd single-def "Inlining Arg" <long[]>
+;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[long]>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rax         class-hnd "Inline return value spill temp" <System.Numerics.Vector`1[float][]>
+;  V06 tmp4         [V06,T03] (  3,  3   )     ref  ->  r14         class-hnd exact single-def "dup spill" <System.Numerics.Vector`1[float][]>
+;* V07 tmp5         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V08 tmp6         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V09 tmp7         [V09    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
+;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V11 tmp9         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;  V12 tmp10        [V12,T05] (  3,  1.50)   byref  ->  rbx         "field V04._reference (fldOffset=0x0)" P-INDEP
+;  V13 tmp11        [V13,T02] (  5,  3   )     int  ->  r15         "field V04._length (fldOffset=0x8)" P-INDEP
 ;
 ; Lcl frame size = 8
 
 G_M51399_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
 						;; size=12 bbWeight=1 PerfScore 5.50
 G_M51399_IG02:
        mov      rsi, gword ptr [rdi+0x08]
        test     rsi, rsi
        je       SHORT G_M51399_IG04
 						;; size=9 bbWeight=1 PerfScore 3.25
 G_M51399_IG03:
        lea      rbx, bword ptr [rsi+0x10]
-       mov      esi, dword ptr [rsi+0x08]
+       mov      r15d, dword ptr [rsi+0x08]
        jmp      SHORT G_M51399_IG05
-						;; size=9 bbWeight=0.50 PerfScore 2.25
+						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M51399_IG04:
        xor      rbx, rbx
-       xor      esi, esi
-						;; size=4 bbWeight=0.50 PerfScore 0.25
+       xor      r15d, r15d
+						;; size=5 bbWeight=0.50 PerfScore 0.25
 G_M51399_IG05:
-       mov      r15d, esi
-       shl      r15, 3
-       shr      r15, 5
-       cmp      r15, 0xD1FFAB1E
-       ja       SHORT G_M51399_IG09
        test     r15d, r15d
        je       SHORT G_M51399_IG07
-						;; size=25 bbWeight=1 PerfScore 3.75
+						;; size=5 bbWeight=1 PerfScore 1.25
 G_M51399_IG06:
-       movsxd   rsi, r15d
+       mov      esi, r15d
        mov      rdi, 0xD1FFAB1E      ; System.Numerics.Vector`1[float][]
        call     CORINFO_HELP_NEWARR_1_VC
        mov      r14, rax
        mov      edx, r15d
        shl      rdx, 5
        lea      rdi, bword ptr [r14+0x10]
        mov      rsi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rax, r14
        jmp      SHORT G_M51399_IG08
 						;; size=52 bbWeight=0.50 PerfScore 4.38
 G_M51399_IG07:
        mov      rax, 0xD1FFAB1E      ; 'System.Numerics.Vector`1[System.Single][]'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M51399_IG08:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
-G_M51399_IG09:
-       call     CORINFO_HELP_OVERFLOW
-       int3     
-						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 138, prolog size 12, PerfScore 22.75, instruction count 42, allocated bytes for code 138 (MethodHash=54963738) for method System.Enum+EnumInfo`1[long]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
+; Total bytes of code 114, prolog size 12, PerfScore 20.25, instruction count 35, allocated bytes for code 114 (MethodHash=54963738) for method System.Enum+EnumInfo`1[long]:CloneValues[System.Numerics.Vector`1[float]]():System.Numerics.Vector`1[float][]:this (FullOpts)
 ; ============================================================

Note: some changes were skipped as they were too large to fit into a comment.

Larger list of diffs: https://gist.github.com/MihuBot/8cc02d7779e3111066f9ef13614cd674

[MihuBot]

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