[JitDiff X64] xtqqczze/dotnet-runtime/UIntCastLengthCheck5 #879

MihuBot · 2025-01-11T17:54:46Z

Job completed in 14 minutes 52 seconds.

Diffs

Found 280 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 40205636
Total bytes of diff: 40205626
Total bytes of delta: -10 (-0.00 % of base)
Total relative delta: -0.31
    diff is an improvement.
    relative diff is an improvement.


Top file regressions (bytes):
          36 : System.Private.CoreLib.dasm (0.00 % of base)
           4 : System.Net.HttpListener.dasm (0.00 % of base)
           1 : System.Reflection.Metadata.dasm (0.00 % of base)

Top file improvements (bytes):
         -26 : System.Private.Xml.dasm (-0.00 % of base)
         -14 : System.Text.Json.dasm (-0.00 % of base)
          -7 : System.Net.Http.dasm (-0.00 % of base)
          -2 : System.Runtime.Numerics.dasm (-0.00 % of base)
          -2 : System.Private.DataContractSerialization.dasm (-0.00 % of base)

8 total files with Code Size differences (5 improved, 3 regressed), 251 unchanged.

Top method regressions (bytes):
           7 (0.99 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[double](System.Enum+EnumInfo`1[double],double):System.String (FullOpts)
           7 (1.13 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[int](System.Enum+EnumInfo`1[int],int):System.String (FullOpts)
           7 (1.10 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[long](System.Enum+EnumInfo`1[long],long):System.String (FullOpts)
           7 (1.11 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[short](System.Enum+EnumInfo`1[short],short):System.String (FullOpts)
           7 (1.11 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[ubyte](System.Enum+EnumInfo`1[ubyte],ubyte):System.String (FullOpts)
           6 (1.17 % of base) : System.Private.CoreLib.dasm - System.String:ReplaceHelper(int,System.String,System.ReadOnlySpan`1[int]):System.String:this (FullOpts)
           4 (0.90 % of base) : System.Net.HttpListener.dasm - System.Net.HttpListener+<>c:<AddPrefix>b__32_1(System.Span`1[ushort],System.ValueTuple`3[System.String,int,int]):this (FullOpts)
           3 (0.37 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[double](System.Enum+EnumInfo`1[double],double,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.42 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[int](System.Enum+EnumInfo`1[int],int,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.42 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[long](System.Enum+EnumInfo`1[long],long,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.41 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[short](System.Enum+EnumInfo`1[short],short,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.41 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[ubyte](System.Enum+EnumInfo`1[ubyte],ubyte,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (1.60 % of base) : System.Private.CoreLib.dasm - System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendFormattedSlow(System.String):this (FullOpts)
           3 (2.26 % of base) : System.Private.CoreLib.dasm - System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:GrowThenCopyString(System.String):this (FullOpts)
           2 (0.08 % of base) : System.Private.CoreLib.dasm - System.Reflection.AssemblyNameFormatter:ComputeDisplayName(System.String,System.Version,System.String,ubyte[],int,int,ubyte[]):System.String (FullOpts)
           2 (0.08 % of base) : System.Reflection.Metadata.dasm - System.Reflection.AssemblyNameFormatter:ComputeDisplayName(System.String,System.Version,System.String,ubyte[],int,int,ubyte[]):System.String (FullOpts)
           1 (0.13 % of base) : System.Private.CoreLib.dasm - System.IO.Path:Join(System.ReadOnlySpan`1[System.String]):System.String (FullOpts)

Top method improvements (bytes):
         -13 (-13.68 % of base) : System.Text.Json.dasm - System.Text.Json.JsonCamelCaseNamingPolicy+<>c:<ConvertName>b__0_0(System.Span`1[ushort],System.String):this (FullOpts)
          -9 (-14.29 % of base) : System.Private.CoreLib.dasm - System.String:CopyTo(System.Span`1[ushort]):this (FullOpts)
          -8 (-2.80 % of base) : System.Private.CoreLib.dasm - System.Enum:WriteMultipleFoundFlagsNames(System.String[],System.ReadOnlySpan`1[int],System.Span`1[ushort]) (FullOpts)
          -8 (-4.21 % of base) : System.Private.Xml.dasm - System.Xml.Serialization.CodeIdentifier+<>c:<MakeCamel>b__3_0(System.Span`1[ushort],System.String):this (FullOpts)
          -8 (-4.21 % of base) : System.Private.Xml.dasm - System.Xml.Serialization.CodeIdentifier+<>c:<MakePascal>b__2_0(System.Span`1[ushort],System.String):this (FullOpts)
          -4 (-1.73 % of base) : System.Private.Xml.dasm - System.Xml.XmlEntityReference+<>c:<ConstructBaseURI>b__27_0(System.Span`1[ushort],System.ValueTuple`2[System.String,System.String]):this (FullOpts)
          -3 (-0.20 % of base) : System.Private.CoreLib.dasm - System.ApplicationId:ToString():System.String:this (FullOpts)
          -3 (-0.19 % of base) : System.Net.Http.dasm - System.Net.Http.Headers.AltSvcHeaderValue:ToString():System.String:this (FullOpts)
          -3 (-0.35 % of base) : System.Net.Http.dasm - System.Net.Http.Headers.HeaderUtilities:Encode5987(System.String):System.String (FullOpts)
          -2 (-0.63 % of base) : System.Runtime.Numerics.dasm - System.Number+<>c:<FormatBigInteger>b__17_0(System.Span`1[ushort],System.ValueTuple`4[int,long,int,System.String]):this (FullOpts)
          -2 (-0.20 % of base) : System.Private.CoreLib.dasm - System.Reflection.MethodBase:AppendParameters(byref,System.Type[],int) (FullOpts)
          -2 (-0.26 % of base) : System.Private.CoreLib.dasm - System.Reflection.RuntimeConstructorInfo:ToString():System.String:this (FullOpts)
          -2 (-0.08 % of base) : System.Private.Xml.dasm - System.Xml.Schema.XsdDateTime:TryFormat(System.Span`1[ushort],byref):ubyte:this (FullOpts)
          -2 (-0.05 % of base) : System.Private.Xml.dasm - System.Xml.Schema.XsdDuration:TryFormat(System.Span`1[ushort],byref,int):ubyte:this (FullOpts)
          -2 (-0.28 % of base) : System.Private.DataContractSerialization.dasm - System.Xml.UniqueId:ToSpan(System.Span`1[ushort]):this (FullOpts)
          -2 (-0.22 % of base) : System.Private.Xml.dasm - System.Xml.XmlDeclaration:get_InnerText():System.String:this (FullOpts)
          -1 (-0.12 % of base) : System.Private.CoreLib.dasm - System.Exception:ToString():System.String:this (FullOpts)
          -1 (-0.10 % of base) : System.Net.Http.dasm - System.Net.Http.Headers.WarningHeaderValue:ToString():System.String:this (FullOpts)
          -1 (-0.08 % of base) : System.Private.CoreLib.dasm - System.Reflection.CustomAttributeData:ToString():System.String:this (FullOpts)
          -1 (-0.04 % of base) : System.Private.CoreLib.dasm - System.Reflection.CustomAttributeTypedArgument:ToString(ubyte):System.String:this (FullOpts)
          -1 (-0.16 % of base) : System.Private.CoreLib.dasm - System.Reflection.Metadata.TypeNameParserHelpers:GetRankOrModifierStringRepresentation(int,byref):System.String (FullOpts)
          -1 (-0.16 % of base) : System.Reflection.Metadata.dasm - System.Reflection.Metadata.TypeNameParserHelpers:GetRankOrModifierStringRepresentation(int,byref):System.String (FullOpts)
          -1 (-0.15 % of base) : System.Private.CoreLib.dasm - System.Reflection.RuntimePropertyInfo:ToString():System.String:this (FullOpts)
          -1 (-0.16 % of base) : System.Text.Json.dasm - System.Text.Json.Nodes.JsonObject:GetPath(byref,System.Text.Json.Nodes.JsonNode):this (FullOpts)

Top method regressions (percentages):
           3 (2.26 % of base) : System.Private.CoreLib.dasm - System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:GrowThenCopyString(System.String):this (FullOpts)
           3 (1.60 % of base) : System.Private.CoreLib.dasm - System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendFormattedSlow(System.String):this (FullOpts)
           6 (1.17 % of base) : System.Private.CoreLib.dasm - System.String:ReplaceHelper(int,System.String,System.ReadOnlySpan`1[int]):System.String:this (FullOpts)
           7 (1.13 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[int](System.Enum+EnumInfo`1[int],int):System.String (FullOpts)
           7 (1.11 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[short](System.Enum+EnumInfo`1[short],short):System.String (FullOpts)
           7 (1.11 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[ubyte](System.Enum+EnumInfo`1[ubyte],ubyte):System.String (FullOpts)
           7 (1.10 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[long](System.Enum+EnumInfo`1[long],long):System.String (FullOpts)
           7 (0.99 % of base) : System.Private.CoreLib.dasm - System.Enum:FormatFlagNames[double](System.Enum+EnumInfo`1[double],double):System.String (FullOpts)
           4 (0.90 % of base) : System.Net.HttpListener.dasm - System.Net.HttpListener+<>c:<AddPrefix>b__32_1(System.Span`1[ushort],System.ValueTuple`3[System.String,int,int]):this (FullOpts)
           3 (0.42 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[int](System.Enum+EnumInfo`1[int],int,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.42 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[long](System.Enum+EnumInfo`1[long],long,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.41 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[ubyte](System.Enum+EnumInfo`1[ubyte],ubyte,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.41 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[short](System.Enum+EnumInfo`1[short],short,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           3 (0.37 % of base) : System.Private.CoreLib.dasm - System.Enum:TryFormatFlagNames[double](System.Enum+EnumInfo`1[double],double,System.Span`1[ushort],byref,byref):ubyte (FullOpts)
           1 (0.13 % of base) : System.Private.CoreLib.dasm - System.IO.Path:Join(System.ReadOnlySpan`1[System.String]):System.String (FullOpts)
           2 (0.08 % of base) : System.Private.CoreLib.dasm - System.Reflection.AssemblyNameFormatter:ComputeDisplayName(System.String,System.Version,System.String,ubyte[],int,int,ubyte[]):System.String (FullOpts)
           2 (0.08 % of base) : System.Reflection.Metadata.dasm - System.Reflection.AssemblyNameFormatter:ComputeDisplayName(System.String,System.Version,System.String,ubyte[],int,int,ubyte[]):System.String (FullOpts)

Top method improvements (percentages):
          -9 (-14.29 % of base) : System.Private.CoreLib.dasm - System.String:CopyTo(System.Span`1[ushort]):this (FullOpts)
         -13 (-13.68 % of base) : System.Text.Json.dasm - System.Text.Json.JsonCamelCaseNamingPolicy+<>c:<ConvertName>b__0_0(System.Span`1[ushort],System.String):this (FullOpts)
          -8 (-4.21 % of base) : System.Private.Xml.dasm - System.Xml.Serialization.CodeIdentifier+<>c:<MakeCamel>b__3_0(System.Span`1[ushort],System.String):this (FullOpts)
          -8 (-4.21 % of base) : System.Private.Xml.dasm - System.Xml.Serialization.CodeIdentifier+<>c:<MakePascal>b__2_0(System.Span`1[ushort],System.String):this (FullOpts)
          -8 (-2.80 % of base) : System.Private.CoreLib.dasm - System.Enum:WriteMultipleFoundFlagsNames(System.String[],System.ReadOnlySpan`1[int],System.Span`1[ushort]) (FullOpts)
          -4 (-1.73 % of base) : System.Private.Xml.dasm - System.Xml.XmlEntityReference+<>c:<ConstructBaseURI>b__27_0(System.Span`1[ushort],System.ValueTuple`2[System.String,System.String]):this (FullOpts)
          -2 (-0.63 % of base) : System.Runtime.Numerics.dasm - System.Number+<>c:<FormatBigInteger>b__17_0(System.Span`1[ushort],System.ValueTuple`4[int,long,int,System.String]):this (FullOpts)
          -3 (-0.35 % of base) : System.Net.Http.dasm - System.Net.Http.Headers.HeaderUtilities:Encode5987(System.String):System.String (FullOpts)
          -2 (-0.28 % of base) : System.Private.DataContractSerialization.dasm - System.Xml.UniqueId:ToSpan(System.Span`1[ushort]):this (FullOpts)
          -2 (-0.26 % of base) : System.Private.CoreLib.dasm - System.Reflection.RuntimeConstructorInfo:ToString():System.String:this (FullOpts)
          -2 (-0.22 % of base) : System.Private.Xml.dasm - System.Xml.XmlDeclaration:get_InnerText():System.String:this (FullOpts)
          -2 (-0.20 % of base) : System.Private.CoreLib.dasm - System.Reflection.MethodBase:AppendParameters(byref,System.Type[],int) (FullOpts)
          -3 (-0.20 % of base) : System.Private.CoreLib.dasm - System.ApplicationId:ToString():System.String:this (FullOpts)
          -3 (-0.19 % of base) : System.Net.Http.dasm - System.Net.Http.Headers.AltSvcHeaderValue:ToString():System.String:this (FullOpts)
          -1 (-0.16 % of base) : System.Text.Json.dasm - System.Text.Json.Nodes.JsonObject:GetPath(byref,System.Text.Json.Nodes.JsonNode):this (FullOpts)
          -1 (-0.16 % of base) : System.Private.CoreLib.dasm - System.Reflection.Metadata.TypeNameParserHelpers:GetRankOrModifierStringRepresentation(int,byref):System.String (FullOpts)
          -1 (-0.16 % of base) : System.Reflection.Metadata.dasm - System.Reflection.Metadata.TypeNameParserHelpers:GetRankOrModifierStringRepresentation(int,byref):System.String (FullOpts)
          -1 (-0.15 % of base) : System.Private.CoreLib.dasm - System.Reflection.RuntimePropertyInfo:ToString():System.String:this (FullOpts)
          -1 (-0.12 % of base) : System.Private.CoreLib.dasm - System.Exception:ToString():System.String:this (FullOpts)
          -1 (-0.10 % of base) : System.Net.Http.dasm - System.Net.Http.Headers.WarningHeaderValue:ToString():System.String:this (FullOpts)
          -2 (-0.08 % of base) : System.Private.Xml.dasm - System.Xml.Schema.XsdDateTime:TryFormat(System.Span`1[ushort],byref):ubyte:this (FullOpts)
          -1 (-0.08 % of base) : System.Private.CoreLib.dasm - System.Reflection.CustomAttributeData:ToString():System.String:this (FullOpts)
          -2 (-0.05 % of base) : System.Private.Xml.dasm - System.Xml.Schema.XsdDuration:TryFormat(System.Span`1[ushort],byref,int):ubyte:this (FullOpts)
          -1 (-0.04 % of base) : System.Private.CoreLib.dasm - System.Reflection.CustomAttributeTypedArgument:ToString(ubyte):System.String:this (FullOpts)

41 total methods with Code Size differences (24 improved, 17 regressed), 233019 unchanged.

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

Artifacts:

The text was updated successfully, but these errors were encountered:

MihuBot · 2025-01-11T18:09:42Z

Top method regressions

7 (0.99 % of base) - System.Enum:FormatFlagNames[double](System.Enum+EnumInfo`1[double],double):System.String

 ; Assembly listing for method System.Enum:FormatFlagNames[double](System.Enum+EnumInfo`1[double],double):System.String (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; 24 single block inlinees; 11 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T21] (  4,  4   )     ref  ->  rdi         class-hnd single-def <System.Enum+EnumInfo`1[double]>
 ;  V01 arg1         [V01,T51] (  6,  8   )  double  ->  mm0         single-def
 ;  V02 loc0         [V02,T08] ( 11, 16   )     ref  ->  rbx         class-hnd exact single-def <System.String[]>
 ;  V03 loc1         [V03,T16] (  7, 11   )     ref  ->  rdi         class-hnd single-def <double[]>
 ;  V04 loc2         [V04,T25] (  6,  4.50)     ref  ->  r15         class-hnd <System.String>
 ;  V05 loc3         [V05,T31] (  6,  3   )     int  ->  rcx         ld-addr-op
 ;* V06 loc4         [V06    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[int]>
 ;  V07 loc5         [V07,T23] (  4,  5   )     int  ->  rdx         ld-addr-op
 ;  V08 loc6         [V08,T17] (  8, 10   )     int  ->  r13         ld-addr-op
 ;# V09 OutArgs      [V09    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V10 tmp1         [V10    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
 ;* V11 tmp2         [V11    ] (  0,  0   )  struct (16) zero-ref    "impAppendStmt" <System.ReadOnlySpan`1[int]>
 ;* V12 tmp3         [V12    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
 ;  V13 tmp4         [V13,T32] (  5,  3   )     ref  ->  r15         class-hnd "Inline return value spill temp" <System.String>
 ;  V14 tmp5         [V14,T30] (  7,  3.25)     int  ->  rcx         "Inline stloc first use temp"
 ;* V15 tmp6         [V15    ] (  0,  0   )  double  ->  zero-ref    "impAppendStmt"
 ;* V16 tmp7         [V16    ] (  0,  0   )  double  ->  zero-ref    "Inlining Arg"
 ;* V17 tmp8         [V17    ] (  0,  0   )  double  ->  zero-ref    "Inlining Arg"
 ;  V18 tmp9         [V18,T35] (  2,  2   )    long  ->  r14         "Inlining Arg"
 ;  V19 tmp10        [V19,T36] (  2,  2   )     int  ->  rcx         "Inlining Arg"
 ;  V20 tmp11        [V20,T49] (  6, 22   )  double  ->  mm0         "Inlining Arg"
 ;  V21 tmp12        [V21,T50] (  5, 16   )  double  ->  mm1         "Inline stloc first use temp"
 ;* V22 tmp13        [V22    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[int]>
 ;* V23 tmp14        [V23    ] (  0,  0   )     int  ->  zero-ref    "Span.get_Item index"
 ;* V24 tmp15        [V24    ] (  0,  0   )  double  ->  zero-ref    "Inlining Arg"
 ;* V25 tmp16        [V25    ] (  0,  0   )  double  ->  zero-ref    "Inlining Arg"
 ;* V26 tmp17        [V26    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V27 tmp18        [V27    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
 ;* V28 tmp19        [V28    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V29 tmp20        [V29    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V30 tmp21        [V30    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
 ;* V31 tmp22        [V31    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V32 tmp23        [V32    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[int]>
 ;* V33 tmp24        [V33    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[int]>
 ;* V34 tmp25        [V34    ] (  0,  0   )   byref  ->  zero-ref    single-def "Inlining Arg"
 ;* V35 tmp26        [V35    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;  V36 tmp27        [V36,T34] (  2,  2   )   byref  ->  r12         single-def "Inlining Arg"
 ;  V37 tmp28        [V37,T37] (  2,  2   )     int  ->  rax         "Inlining Arg"
 ;* V38 tmp29        [V38    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[int]>
 ;  V39 tmp30        [V39,T42] (  2,  1   )     int  ->  rdx         "Inline stloc first use temp"
 ;  V40 tmp31        [V40,T14] (  3, 12   )     ref  ->  rsi         class-hnd exact "Inline stloc first use temp" <System.String>
 ;* V41 tmp32        [V41    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V42 tmp33        [V42    ] (  0,  0   )  struct (16) zero-ref    "impAppendStmt" <System.Span`1[ushort]>
 ;* V43 tmp34        [V43    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V44 tmp35        [V44    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V45 tmp36        [V45    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V46 tmp37        [V46    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;  V47 tmp38        [V47,T03] (  3, 24   )     int  ->   r8         "Inlining Arg"
+;  V47 tmp38        [V47,T03] (  3, 24   )     int  ->  rdx         "Inlining Arg"
 ;* V48 tmp39        [V48    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
 ;  V49 tmp40        [V49,T10] (  2, 16   )   byref  ->  r12         "Inlining Arg"
-;  V50 tmp41        [V50,T04] (  2, 16   )     int  ->  rax         "Inlining Arg"
+;  V50 tmp41        [V50,T04] (  2, 16   )     int  ->  rsi         "Inlining Arg"
 ;* V51 tmp42        [V51    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
-;  V52 tmp43        [V52,T11] (  2, 16   )   byref  ->  rcx         "Inlining Arg"
-;  V53 tmp44        [V53,T12] (  2, 16   )     int  ->  rax         "Inlining Arg"
-;  V54 tmp45        [V54,T26] (  4,  4   )     ref  ->  rsi         class-hnd exact single-def "Inlining Arg" <System.String>
-;* V55 tmp46        [V55    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;  V52 tmp43        [V52,T11] (  2, 16   )   byref  ->  rsi         "Inlining Arg"
+;  V53 tmp44        [V53,T12] (  2, 16   )     int  ->  rdx         "Inlining Arg"
+;* V54 tmp45        [V54    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;  V55 tmp46        [V55,T26] (  4,  4   )     ref  ->  rsi         class-hnd exact single-def "Inlining Arg" <System.String>
 ;* V56 tmp47        [V56    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V57 tmp48        [V57    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V58 tmp49        [V58    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;  V59 tmp50        [V59,T29] (  3,  3   )   byref  ->  r14         "field V06._reference (fldOffset=0x0)" P-INDEP
 ;* V60 tmp51        [V60,T45] (  0,  0   )     int  ->  zero-ref    "field V06._length (fldOffset=0x8)" P-INDEP
 ;  V61 tmp52        [V61,T38] (  2,  1   )   byref  ->  r14         single-def "field V10._reference (fldOffset=0x0)" P-INDEP
 ;* V62 tmp53        [V62,T46] (  0,  0   )     int  ->  zero-ref    "field V10._length (fldOffset=0x8)" P-INDEP
 ;* V63 tmp54        [V63    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
 ;* V64 tmp55        [V64    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
 ;  V65 tmp56        [V65,T39] (  2,  1   )   byref  ->  r12         single-def "field V12._reference (fldOffset=0x0)" P-INDEP
 ;  V66 tmp57        [V66,T43] (  2,  1   )     int  ->  rax         "field V12._length (fldOffset=0x8)" P-INDEP
 ;* V67 tmp58        [V67,T44] (  0,  0   )   byref  ->  zero-ref    single-def "field V22._reference (fldOffset=0x0)" P-INDEP
 ;* V68 tmp59        [V68,T47] (  0,  0   )     int  ->  zero-ref    "field V22._length (fldOffset=0x8)" P-INDEP
 ;  V69 tmp60        [V69,T40] (  2,  1   )   byref  ->  r14         single-def "field V27._reference (fldOffset=0x0)" P-INDEP
 ;* V70 tmp61        [V70    ] (  0,  0   )     int  ->  zero-ref    "field V27._length (fldOffset=0x8)" P-INDEP
 ;* V71 tmp62        [V71    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V32._reference (fldOffset=0x0)" P-INDEP
 ;* V72 tmp63        [V72    ] (  0,  0   )     int  ->  zero-ref    "field V32._length (fldOffset=0x8)" P-INDEP
 ;  V73 tmp64        [V73,T41] (  2,  1   )   byref  ->  r14         single-def "field V33._reference (fldOffset=0x0)" P-INDEP
 ;* V74 tmp65        [V74,T48] (  0,  0   )     int  ->  zero-ref    "field V33._length (fldOffset=0x8)" P-INDEP
 ;  V75 tmp66        [V75,T24] (  3,  5   )   byref  ->  r14         single-def "field V38._reference (fldOffset=0x0)" P-INDEP
 ;  V76 tmp67        [V76,T22] (  4,  5.50)     int  ->  r13         "field V38._length (fldOffset=0x8)" P-INDEP
 ;  V77 tmp68        [V77,T00] (  9, 29   )   byref  ->  r12         "field V41._reference (fldOffset=0x0)" P-INDEP
 ;  V78 tmp69        [V78,T01] (  9, 29   )     int  ->  [rbp-0x2C]  "field V41._length (fldOffset=0x8)" P-INDEP
 ;* V79 tmp70        [V79    ] (  0,  0   )   byref  ->  zero-ref    "field V42._reference (fldOffset=0x0)" P-INDEP
 ;* V80 tmp71        [V80    ] (  0,  0   )     int  ->  zero-ref    "field V42._length (fldOffset=0x8)" P-INDEP
 ;* V81 tmp72        [V81    ] (  0,  0   )   byref  ->  zero-ref    "field V43._reference (fldOffset=0x0)" P-INDEP
 ;* V82 tmp73        [V82    ] (  0,  0   )     int  ->  zero-ref    "field V43._length (fldOffset=0x8)" P-INDEP
 ;  V83 tmp74        [V83,T18] (  2,  8   )   byref  ->  r12         "field V48._reference (fldOffset=0x0)" P-INDEP
 ;* V84 tmp75        [V84,T28] (  0,  0   )     int  ->  zero-ref    "field V48._length (fldOffset=0x8)" P-INDEP
-;  V85 tmp76        [V85,T19] (  2,  8   )   byref  ->  rcx         "field V51._reference (fldOffset=0x0)" P-INDEP
-;  V86 tmp77        [V86,T20] (  2,  8   )     int  ->  rax         "field V51._length (fldOffset=0x8)" P-INDEP
-;* V87 tmp78        [V87    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V55._reference (fldOffset=0x0)" P-INDEP
-;* V88 tmp79        [V88    ] (  0,  0   )     int  ->  zero-ref    "field V55._length (fldOffset=0x8)" P-INDEP
+;  V85 tmp76        [V85,T19] (  2,  8   )   byref  ->  rsi         "field V51._reference (fldOffset=0x0)" P-INDEP
+;  V86 tmp77        [V86,T20] (  2,  8   )     int  ->  rdx         "field V51._length (fldOffset=0x8)" P-INDEP
+;* V87 tmp78        [V87    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V54._reference (fldOffset=0x0)" P-INDEP
+;* V88 tmp79        [V88    ] (  0,  0   )     int  ->  zero-ref    "field V54._length (fldOffset=0x8)" P-INDEP
 ;  V89 tmp80        [V89,T05] (  3, 24   )     int  ->  rdx         "index expr"
-;  V90 tmp81        [V90,T33] (  3,  3   )     int  ->  rcx         "index expr"
+;  V90 tmp81        [V90,T33] (  3,  3   )     int  ->  rsi         "index expr"
 ;  V91 GsCookie     [V91    ] (  1,  1   )    long  ->  [rbp-0x50]  do-not-enreg[X] addr-exposed "GSSecurityCookie"
 ;  V92 cse0         [V92,T15] (  3, 12   )    long  ->  [rbp-0x38]  spill-single-def "CSE #12: moderate"
 ;  V93 cse1         [V93,T13] (  8, 14.50)     int  ->  rax         multi-def "CSE #01: moderate"
 ;  V94 cse2         [V94,T09] (  4, 16   )     int  ->  [rbp-0x3C]  spill-single-def "CSE #10: moderate"
 ;  V95 cse3         [V95,T27] (  2,  4   )    long  ->  rsi         "CSE #07: moderate"
 ;  V96 rat0         [V96,T06] (  9, 21.75)    long  ->  rdx         "Widened IV V14"
 ;  V97 rat1         [V97,T02] (  9, 26.50)    long  ->  rcx         "Widened IV V19"
 ;  V98 rat2         [V98,T07] (  7, 21   )    long  ->  [rbp-0x48]  "Widened IV V39"
 ;
 ; Lcl frame size = 40
 
 G_M41568_IG01:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     r12
        push     rbx
        sub      rsp, 40
        lea      rbp, [rsp+0x50]
        mov      qword ptr [rbp-0x50], 0xD1FFAB1E
 						;; size=27 bbWeight=1 PerfScore 7.75
 G_M41568_IG02:
        mov      rbx, gword ptr [rdi+0x10]
        mov      rdi, gword ptr [rdi+0x08]
        vxorps   xmm1, xmm1, xmm1
        vucomisd xmm0, xmm1
        jp       SHORT G_M41568_IG03
        je       SHORT G_M41568_IG09
 						;; size=20 bbWeight=1 PerfScore 8.33
 G_M41568_IG03:
        mov      eax, dword ptr [rdi+0x08]
        lea      ecx, [rax-0x01]
        mov      edx, ecx
        cmp      eax, edx
        jbe      SHORT G_M41568_IG07
        align    [5 bytes for IG04]
 						;; size=17 bbWeight=0.50 PerfScore 2.12
 G_M41568_IG04:
        cmp      edx, eax
-       jae      G_M41568_IG27
+       jae      G_M41568_IG29
        vucomisd xmm0, qword ptr [rdi+8*rdx+0x10]
        jae      SHORT G_M41568_IG06
        dec      edx
        cmp      eax, edx
        ja       SHORT G_M41568_IG04
 						;; size=22 bbWeight=4 PerfScore 35.00
 G_M41568_IG05:
        mov      ecx, edx
        jmp      SHORT G_M41568_IG07
        align    [0 bytes for IG13]
 						;; size=4 bbWeight=0.25 PerfScore 0.56
 G_M41568_IG06:
        mov      ecx, edx
        mov      edx, ecx
        vmovsd   xmm1, qword ptr [rdi+8*rdx+0x10]
        vucomisd xmm1, xmm0
        jp       SHORT G_M41568_IG07
        je       SHORT G_M41568_IG08
 						;; size=18 bbWeight=0.50 PerfScore 4.25
 G_M41568_IG07:
        xor      r15, r15
        jmp      SHORT G_M41568_IG11
 						;; size=5 bbWeight=0.50 PerfScore 1.12
 G_M41568_IG08:
        cmp      ecx, dword ptr [rbx+0x08]
-       jae      G_M41568_IG27
+       jae      G_M41568_IG29
        mov      edx, ecx
        mov      r15, gword ptr [rbx+8*rdx+0x10]
        jmp      SHORT G_M41568_IG11
 						;; size=18 bbWeight=0.50 PerfScore 4.12
 G_M41568_IG09:
        xor      ecx, ecx
        mov      eax, dword ptr [rdi+0x08]
        test     eax, eax
        je       SHORT G_M41568_IG10
        vmovsd   xmm1, qword ptr [rdi+0x10]
        vxorps   xmm2, xmm2, xmm2
        vucomisd xmm1, xmm2
        jp       SHORT G_M41568_IG10
        jne      SHORT G_M41568_IG10
        cmp      dword ptr [rbx+0x08], 0
-       jbe      G_M41568_IG27
+       jbe      G_M41568_IG29
        mov      r15, gword ptr [rbx+0x10]
        jmp      SHORT G_M41568_IG11
 						;; size=42 bbWeight=0.50 PerfScore 9.92
 G_M41568_IG10:
        mov      r15, 0xD1FFAB1E      ; '0'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M41568_IG11:
        test     r15, r15
-       jne      G_M41568_IG21
+       jne      G_M41568_IG23
 						;; size=9 bbWeight=1 PerfScore 1.25
 G_M41568_IG12:
        test     dword ptr [rsp], esp
        sub      rsp, 256
        lea      r14, [rsp]
        xor      edx, edx
        xor      r13d, r13d
        mov      ecx, ecx
        jmp      SHORT G_M41568_IG14
 						;; size=23 bbWeight=0.50 PerfScore 3.25
 G_M41568_IG13:
        dec      ecx
 						;; size=2 bbWeight=4 PerfScore 1.00
 G_M41568_IG14:
        cmp      eax, ecx
        jbe      G_M41568_IG18
        vmovsd   xmm1, qword ptr [rdi+8*rcx+0x10]
        test     ecx, ecx
        jne      SHORT G_M41568_IG16
 						;; size=18 bbWeight=4 PerfScore 26.00
 G_M41568_IG15:
        vxorps   xmm2, xmm2, xmm2
        vucomisd xmm1, xmm2
        jp       SHORT G_M41568_IG16
        je       SHORT G_M41568_IG18
 						;; size=12 bbWeight=2 PerfScore 8.67
 G_M41568_IG16:
        vmovd    rsi, xmm0
        vmovd    r8, xmm1
        and      rsi, r8
        vmovd    xmm2, rsi
        vucomisd xmm2, xmm1
        jp       SHORT G_M41568_IG13
        jne      SHORT G_M41568_IG13
 						;; size=26 bbWeight=4 PerfScore 41.00
 G_M41568_IG17:
        vmovd    rsi, xmm1
        not      rsi
        vmovd    r8, xmm0
        and      rsi, r8
        vmovd    xmm0, rsi
        cmp      r13d, 64
-       jae      G_M41568_IG27
+       jae      G_M41568_IG29
        mov      esi, r13d
        mov      dword ptr [r14+4*rsi], ecx
        inc      r13d
        cmp      ecx, dword ptr [rbx+0x08]
-       jae      G_M41568_IG27
+       jae      G_M41568_IG29
        mov      rsi, gword ptr [rbx+8*rcx+0x10]
        add      edx, dword ptr [rsi+0x08]
-       jo       G_M41568_IG28
+       jo       G_M41568_IG30
        vxorps   xmm1, xmm1, xmm1
        vucomisd xmm0, xmm1
        jp       G_M41568_IG13
        jne      G_M41568_IG13
 						;; size=84 bbWeight=2 PerfScore 47.17
 G_M41568_IG18:
        vxorps   xmm1, xmm1, xmm1
        vucomisd xmm0, xmm1
-       jp       G_M41568_IG21
-       jne      G_M41568_IG21
+       jp       G_M41568_IG23
+       jne      G_M41568_IG23
        cmp      r13d, 64
-       ja       G_M41568_IG26
+       ja       G_M41568_IG28
        lea      edi, [r13+r13]
        add      edi, -2
        add      edi, edx
-       jo       G_M41568_IG28
+       jo       G_M41568_IG30
        call     System.String:FastAllocateString(int):System.String
        mov      r15, rax
        lea      r12, bword ptr [r15+0x0C]
        mov      eax, dword ptr [r15+0x08]
        lea      edx, [r13-0x01]
        mov      ecx, edx
        test     ecx, ecx
-       je       G_M41568_IG20
-						;; size=76 bbWeight=0.50 PerfScore 7.42
+       jne      SHORT G_M41568_IG21
+						;; size=72 bbWeight=0.50 PerfScore 7.42
 G_M41568_IG19:
+       mov      edx, eax
+       jmp      G_M41568_IG22
+						;; size=7 bbWeight=0.25 PerfScore 0.56
+G_M41568_IG20:
+       mov      eax, edx
+						;; size=2 bbWeight=2 PerfScore 0.50
+G_M41568_IG21:
        cmp      ecx, r13d
-       jae      G_M41568_IG27
+       jae      G_M41568_IG29
        mov      qword ptr [rbp-0x48], rcx
        mov      edx, dword ptr [r14+4*rcx]
        cmp      edx, dword ptr [rbx+0x08]
-       jae      G_M41568_IG27
+       jae      G_M41568_IG29
        mov      rsi, gword ptr [rbx+8*rdx+0x10]
        mov      r8d, dword ptr [rsi+0x08]
        mov      dword ptr [rbp-0x3C], r8d
        mov      dword ptr [rbp-0x2C], eax
        cmp      r8d, eax
-       jg       G_M41568_IG25
+       jg       G_M41568_IG27
        mov      r9d, r8d
        add      r9, r9
        mov      qword ptr [rbp-0x38], r9
        mov      rdx, r9
        add      rsi, 12
        mov      rdi, r12
        mov      r10, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [r10]System.SpanHelpers:Memmove(byref,byref,ulong)
-       mov      r8d, dword ptr [rbp-0x3C]
-       mov      eax, dword ptr [rbp-0x2C]
-       cmp      r8d, eax
-       ja       G_M41568_IG26
-       mov      r9, qword ptr [rbp-0x38]
-       add      r12, r9
-       sub      eax, r8d
-       cmp      eax, 2
-       jb       G_M41568_IG26
-       lea      rcx, bword ptr [r12+0x04]
-       add      eax, -2
+       mov      edx, dword ptr [rbp-0x3C]
+       mov      esi, dword ptr [rbp-0x2C]
+       cmp      edx, esi
+       ja       G_M41568_IG28
+       mov      rdi, qword ptr [rbp-0x38]
+       add      r12, rdi
+       sub      esi, edx
+       mov      edx, esi
+       cmp      edx, 2
+       jb       G_M41568_IG28
+       lea      rsi, bword ptr [r12+0x04]
+       add      edx, -2
        mov      word  ptr [r12], 44
        mov      word  ptr [r12+0x02], 32
-       mov      r12, rcx
-       mov      rcx, qword ptr [rbp-0x48]
-       dec      ecx
-       jne      G_M41568_IG19
-						;; size=157 bbWeight=4 PerfScore 129.00
-G_M41568_IG20:
+       mov      r12, rsi
+       mov      rsi, qword ptr [rbp-0x48]
+       dec      esi
+       mov      rcx, rsi
+       jne      G_M41568_IG20
+						;; size=159 bbWeight=4 PerfScore 131.00
+G_M41568_IG22:
        test     r13d, r13d
-       je       SHORT G_M41568_IG27
-       mov      ecx, dword ptr [r14]
-       cmp      ecx, dword ptr [rbx+0x08]
-       jae      SHORT G_M41568_IG27
-       mov      rsi, gword ptr [rbx+8*rcx+0x10]
-       cmp      dword ptr [rsi+0x08], eax
-       jg       SHORT G_M41568_IG25
+       je       SHORT G_M41568_IG29
+       mov      esi, dword ptr [r14]
+       cmp      esi, dword ptr [rbx+0x08]
+       jae      SHORT G_M41568_IG29
+       mov      rsi, gword ptr [rbx+8*rsi+0x10]
+       cmp      dword ptr [rsi+0x08], edx
+       jg       SHORT G_M41568_IG27
        mov      edx, dword ptr [rsi+0x08]
        add      rdx, rdx
        add      rsi, 12
        mov      rdi, r12
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
 						;; size=48 bbWeight=0.50 PerfScore 9.62
-G_M41568_IG21:
+G_M41568_IG23:
        mov      rax, r15
 						;; size=3 bbWeight=1 PerfScore 0.25
-G_M41568_IG22:
+G_M41568_IG24:
        cmp      qword ptr [rbp-0x50], 0xD1FFAB1E
-       je       SHORT G_M41568_IG23
+       je       SHORT G_M41568_IG25
        call     CORINFO_HELP_FAIL_FAST
 						;; size=15 bbWeight=1 PerfScore 4.00
-G_M41568_IG23:
+G_M41568_IG25:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
-G_M41568_IG24:
+G_M41568_IG26:
        lea      rsp, [rbp-0x28]
        pop      rbx
        pop      r12
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=15 bbWeight=1 PerfScore 4.50
-G_M41568_IG25:
+G_M41568_IG27:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
-G_M41568_IG26:
+G_M41568_IG28:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
        call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
-G_M41568_IG27:
+G_M41568_IG29:
        call     CORINFO_HELP_RNGCHKFAIL
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
-G_M41568_IG28:
+G_M41568_IG30:
        call     CORINFO_HELP_OVERFLOW
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 710, prolog size 27, PerfScore 356.69, instruction count 195, allocated bytes for code 710 (MethodHash=7b8d5d9f) for method System.Enum:FormatFlagNames[double](System.Enum+EnumInfo`1[double],double):System.String (FullOpts)
+; Total bytes of code 717, prolog size 27, PerfScore 359.75, instruction count 200, allocated bytes for code 717 (MethodHash=7b8d5d9f) for method System.Enum:FormatFlagNames[double](System.Enum+EnumInfo`1[double],double):System.String (FullOpts)
 ; ============================================================

7 (1.13 % of base) - System.Enum:FormatFlagNames[int](System.Enum+EnumInfo`1[int],int):System.String

 ; Assembly listing for method System.Enum:FormatFlagNames[int](System.Enum+EnumInfo`1[int],int):System.String (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; 24 single block inlinees; 11 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T24] (  4,  4   )     ref  ->  rdi         class-hnd single-def <System.Enum+EnumInfo`1[int]>
 ;  V01 arg1         [V01,T20] (  6,  8   )     int  ->  rsi         single-def
 ;  V02 loc0         [V02,T10] ( 11, 16   )     ref  ->  rbx         class-hnd exact single-def <System.String[]>
 ;  V03 loc1         [V03,T18] (  7, 11   )     ref  ->  rdi         class-hnd single-def <int[]>
 ;  V04 loc2         [V04,T28] (  6,  4.50)     ref  ->  r15         class-hnd <System.String>
 ;  V05 loc3         [V05,T33] (  6,  3   )     int  ->  rcx         ld-addr-op
 ;* V06 loc4         [V06    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[int]>
 ;  V07 loc5         [V07,T26] (  4,  5   )     int  ->  rdx         ld-addr-op
 ;  V08 loc6         [V08,T19] (  8, 10   )     int  ->  r13         ld-addr-op
 ;# V09 OutArgs      [V09    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V10 tmp1         [V10    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
 ;* V11 tmp2         [V11    ] (  0,  0   )  struct (16) zero-ref    "impAppendStmt" <System.ReadOnlySpan`1[int]>
 ;* V12 tmp3         [V12    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
 ;  V13 tmp4         [V13,T34] (  5,  3   )     ref  ->  r15         class-hnd "Inline return value spill temp" <System.String>
 ;  V14 tmp5         [V14,T32] (  7,  3.25)     int  ->  rcx         "Inline stloc first use temp"
 ;* V15 tmp6         [V15    ] (  0,  0   )     int  ->  zero-ref    "impAppendStmt"
 ;* V16 tmp7         [V16    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V17 tmp8         [V17    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;  V18 tmp9         [V18,T37] (  2,  2   )    long  ->  r14         "Inlining Arg"
 ;  V19 tmp10        [V19,T38] (  2,  2   )     int  ->  rcx         "Inlining Arg"
 ;  V20 tmp11        [V20,T06] (  6, 22   )     int  ->  rsi         "Inlining Arg"
 ;  V21 tmp12        [V21,T09] (  5, 18   )     int  ->   r8         "Inline stloc first use temp"
 ;* V22 tmp13        [V22    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[int]>
 ;* V23 tmp14        [V23    ] (  0,  0   )     int  ->  zero-ref    "Span.get_Item index"
 ;* V24 tmp15        [V24    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V25 tmp16        [V25    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V26 tmp17        [V26    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V27 tmp18        [V27    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[int]>
 ;* V28 tmp19        [V28    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V29 tmp20        [V29    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V30 tmp21        [V30    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
 ;* V31 tmp22        [V31    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V32 tmp23        [V32    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[int]>
 ;* V33 tmp24        [V33    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[int]>
 ;* V34 tmp25        [V34    ] (  0,  0   )   byref  ->  zero-ref    single-def "Inlining Arg"
 ;* V35 tmp26        [V35    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;  V36 tmp27        [V36,T36] (  2,  2   )   byref  ->  r12         single-def "Inlining Arg"
 ;  V37 tmp28        [V37,T39] (  2,  2   )     int  ->  rax         "Inlining Arg"
 ;* V38 tmp29        [V38    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[int]>
 ;  V39 tmp30        [V39,T44] (  2,  1   )     int  ->  rdx         "Inline stloc first use temp"
 ;  V40 tmp31        [V40,T16] (  3, 12   )     ref  ->  rsi         class-hnd exact "Inline stloc first use temp" <System.String>
 ;* V41 tmp32        [V41    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V42 tmp33        [V42    ] (  0,  0   )  struct (16) zero-ref    "impAppendStmt" <System.Span`1[ushort]>
 ;* V43 tmp34        [V43    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V44 tmp35        [V44    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V45 tmp36        [V45    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V46 tmp37        [V46    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;  V47 tmp38        [V47,T03] (  3, 24   )     int  ->   r8         "Inlining Arg"
+;  V47 tmp38        [V47,T03] (  3, 24   )     int  ->  rdx         "Inlining Arg"
 ;* V48 tmp39        [V48    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
 ;  V49 tmp40        [V49,T12] (  2, 16   )   byref  ->  r12         "Inlining Arg"
-;  V50 tmp41        [V50,T04] (  2, 16   )     int  ->  rax         "Inlining Arg"
+;  V50 tmp41        [V50,T04] (  2, 16   )     int  ->  rsi         "Inlining Arg"
 ;* V51 tmp42        [V51    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
-;  V52 tmp43        [V52,T13] (  2, 16   )   byref  ->  rcx         "Inlining Arg"
-;  V53 tmp44        [V53,T14] (  2, 16   )     int  ->  rax         "Inlining Arg"
-;  V54 tmp45        [V54,T29] (  4,  4   )     ref  ->  rsi         class-hnd exact single-def "Inlining Arg" <System.String>
-;* V55 tmp46        [V55    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;  V52 tmp43        [V52,T13] (  2, 16   )   byref  ->  rsi         "Inlining Arg"
+;  V53 tmp44        [V53,T14] (  2, 16   )     int  ->  rdx         "Inlining Arg"
+;* V54 tmp45        [V54    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;  V55 tmp46        [V55,T29] (  4,  4   )     ref  ->  rsi         class-hnd exact single-def "Inlining Arg" <System.String>
 ;* V56 tmp47        [V56    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V57 tmp48        [V57    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V58 tmp49        [V58    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;  V59 tmp50        [V59,T31] (  3,  3   )   byref  ->  r14         "field V06._reference (fldOffset=0x0)" P-INDEP
 ;* V60 tmp51        [V60,T47] (  0,  0   )     int  ->  zero-ref    "field V06._length (fldOffset=0x8)" P-INDEP
 ;  V61 tmp52        [V61,T40] (  2,  1   )   byref  ->  r14         single-def "field V10._reference (fldOffset=0x0)" P-INDEP
 ;* V62 tmp53        [V62,T48] (  0,  0   )     int  ->  zero-ref    "field V10._length (fldOffset=0x8)" P-INDEP
 ;* V63 tmp54        [V63    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V11._reference (fldOffset=0x0)" P-INDEP
 ;* V64 tmp55        [V64    ] (  0,  0   )     int  ->  zero-ref    "field V11._length (fldOffset=0x8)" P-INDEP
 ;  V65 tmp56        [V65,T41] (  2,  1   )   byref  ->  r12         single-def "field V12._reference (fldOffset=0x0)" P-INDEP
 ;  V66 tmp57        [V66,T45] (  2,  1   )     int  ->  rax         "field V12._length (fldOffset=0x8)" P-INDEP
 ;* V67 tmp58        [V67,T46] (  0,  0   )   byref  ->  zero-ref    single-def "field V22._reference (fldOffset=0x0)" P-INDEP
 ;* V68 tmp59        [V68,T49] (  0,  0   )     int  ->  zero-ref    "field V22._length (fldOffset=0x8)" P-INDEP
 ;  V69 tmp60        [V69,T42] (  2,  1   )   byref  ->  r14         single-def "field V27._reference (fldOffset=0x0)" P-INDEP
 ;* V70 tmp61        [V70    ] (  0,  0   )     int  ->  zero-ref    "field V27._length (fldOffset=0x8)" P-INDEP
 ;* V71 tmp62        [V71    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V32._reference (fldOffset=0x0)" P-INDEP
 ;* V72 tmp63        [V72    ] (  0,  0   )     int  ->  zero-ref    "field V32._length (fldOffset=0x8)" P-INDEP
 ;  V73 tmp64        [V73,T43] (  2,  1   )   byref  ->  r14         single-def "field V33._reference (fldOffset=0x0)" P-INDEP
 ;* V74 tmp65        [V74,T50] (  0,  0   )     int  ->  zero-ref    "field V33._length (fldOffset=0x8)" P-INDEP
 ;  V75 tmp66        [V75,T27] (  3,  5   )   byref  ->  r14         single-def "field V38._reference (fldOffset=0x0)" P-INDEP
 ;  V76 tmp67        [V76,T25] (  4,  5.50)     int  ->  r13         "field V38._length (fldOffset=0x8)" P-INDEP
 ;  V77 tmp68        [V77,T00] (  9, 29   )   byref  ->  r12         "field V41._reference (fldOffset=0x0)" P-INDEP
 ;  V78 tmp69        [V78,T01] (  9, 29   )     int  ->  [rbp-0x2C]  "field V41._length (fldOffset=0x8)" P-INDEP
 ;* V79 tmp70        [V79    ] (  0,  0   )   byref  ->  zero-ref    "field V42._reference (fldOffset=0x0)" P-INDEP
 ;* V80 tmp71        [V80    ] (  0,  0   )     int  ->  zero-ref    "field V42._length (fldOffset=0x8)" P-INDEP
 ;* V81 tmp72        [V81    ] (  0,  0   )   byref  ->  zero-ref    "field V43._reference (fldOffset=0x0)" P-INDEP
 ;* V82 tmp73        [V82    ] (  0,  0   )     int  ->  zero-ref    "field V43._length (fldOffset=0x8)" P-INDEP
 ;  V83 tmp74        [V83,T21] (  2,  8   )   byref  ->  r12         "field V48._reference (fldOffset=0x0)" P-INDEP
 ;* V84 tmp75        [V84,T30] (  0,  0   )     int  ->  zero-ref    "field V48._length (fldOffset=0x8)" P-INDEP
-;  V85 tmp76        [V85,T22] (  2,  8   )   byref  ->  rcx         "field V51._reference (fldOffset=0x0)" P-INDEP
-;  V86 tmp77        [V86,T23] (  2,  8   )     int  ->  rax         "field V51._length (fldOffset=0x8)" P-INDEP
-;* V87 tmp78        [V87    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V55._reference (fldOffset=0x0)" P-INDEP
-;* V88 tmp79        [V88    ] (  0,  0   )     int  ->  zero-ref    "field V55._length (fldOffset=0x8)" P-INDEP
+;  V85 tmp76        [V85,T22] (  2,  8   )   byref  ->  rsi         "field V51._reference (fldOffset=0x0)" P-INDEP
+;  V86 tmp77        [V86,T23] (  2,  8   )     int  ->  rdx         "field V51._length (fldOffset=0x8)" P-INDEP
+;* V87 tmp78        [V87    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V54._reference (fldOffset=0x0)" P-INDEP
+;* V88 tmp79        [V88    ] (  0,  0   )     int  ->  zero-ref    "field V54._length (fldOffset=0x8)" P-INDEP
 ;  V89 tmp80        [V89,T05] (  3, 24   )     int  ->  rdx         "index expr"
-;  V90 tmp81        [V90,T35] (  3,  3   )     int  ->  rcx         "index expr"
+;  V90 tmp81        [V90,T35] (  3,  3   )     int  ->  rsi         "index expr"
 ;  V91 GsCookie     [V91    ] (  1,  1   )    long  ->  [rbp-0x50]  do-not-enreg[X] addr-exposed "GSSecurityCookie"
 ;  V92 cse0         [V92,T17] (  3, 12   )    long  ->  [rbp-0x38]  spill-single-def "CSE #09: moderate"
 ;  V93 cse1         [V93,T15] (  8, 14.50)     int  ->  rax         multi-def "CSE #01: moderate"
 ;  V94 cse2         [V94,T11] (  4, 16   )     int  ->  [rbp-0x3C]  spill-single-def "CSE #07: moderate"
 ;  V95 rat0         [V95,T07] (  9, 21.75)    long  ->  rdx         "Widened IV V14"
 ;  V96 rat1         [V96,T02] (  9, 26.50)    long  ->  rcx         "Widened IV V19"
 ;  V97 rat2         [V97,T08] (  7, 21   )    long  ->  [rbp-0x48]  "Widened IV V39"
 ;
 ; Lcl frame size = 40
 
 G_M902_IG01:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     r12
        push     rbx
        sub      rsp, 40
        lea      rbp, [rsp+0x50]
        mov      qword ptr [rbp-0x50], 0xD1FFAB1E
 						;; size=27 bbWeight=1 PerfScore 7.75
 G_M902_IG02:
        mov      rbx, gword ptr [rdi+0x10]
        mov      rdi, gword ptr [rdi+0x08]
        test     esi, esi
        je       SHORT G_M902_IG09
 						;; size=12 bbWeight=1 PerfScore 5.25
 G_M902_IG03:
        mov      eax, dword ptr [rdi+0x08]
        lea      ecx, [rax-0x01]
        mov      edx, ecx
        cmp      eax, edx
        jbe      SHORT G_M902_IG07
        align    [13 bytes for IG04]
 						;; size=25 bbWeight=0.50 PerfScore 2.12
 G_M902_IG04:
        cmp      edx, eax
-       jae      G_M902_IG26
+       jae      G_M902_IG28
        cmp      dword ptr [rdi+4*rdx+0x10], esi
        jle      SHORT G_M902_IG06
        dec      edx
        cmp      eax, edx
        ja       SHORT G_M902_IG04
 						;; size=20 bbWeight=4 PerfScore 27.00
 G_M902_IG05:
        mov      ecx, edx
        jmp      SHORT G_M902_IG07
        align    [0 bytes for IG13]
 						;; size=4 bbWeight=0.25 PerfScore 0.56
 G_M902_IG06:
        mov      ecx, edx
        mov      edx, ecx
        cmp      dword ptr [rdi+4*rdx+0x10], esi
        je       SHORT G_M902_IG08
 						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M902_IG07:
        xor      r15, r15
        jmp      SHORT G_M902_IG11
 						;; size=5 bbWeight=0.50 PerfScore 1.12
 G_M902_IG08:
        cmp      ecx, dword ptr [rbx+0x08]
-       jae      G_M902_IG26
+       jae      G_M902_IG28
        mov      edx, ecx
        mov      r15, gword ptr [rbx+8*rdx+0x10]
        jmp      SHORT G_M902_IG11
 						;; size=18 bbWeight=0.50 PerfScore 4.12
 G_M902_IG09:
        xor      ecx, ecx
        mov      eax, dword ptr [rdi+0x08]
        test     eax, eax
        je       SHORT G_M902_IG10
        cmp      dword ptr [rdi+0x10], 0
        jne      SHORT G_M902_IG10
        cmp      dword ptr [rbx+0x08], 0
-       jbe      G_M902_IG26
+       jbe      G_M902_IG28
        mov      r15, gword ptr [rbx+0x10]
        jmp      SHORT G_M902_IG11
 						;; size=31 bbWeight=0.50 PerfScore 7.75
 G_M902_IG10:
        mov      r15, 0xD1FFAB1E      ; '0'
 						;; size=10 bbWeight=0.50 PerfScore 0.12
 G_M902_IG11:
        test     r15, r15
-       jne      G_M902_IG20
+       jne      G_M902_IG22
 						;; size=9 bbWeight=1 PerfScore 1.25
 G_M902_IG12:
        test     dword ptr [rsp], esp
        sub      rsp, 256
        lea      r14, [rsp]
        xor      edx, edx
        xor      r13d, r13d
        mov      ecx, ecx
        jmp      SHORT G_M902_IG16
 						;; size=23 bbWeight=0.50 PerfScore 3.25
 G_M902_IG13:
        mov      r9d, esi
        and      r9d, r8d
        cmp      r9d, r8d
        jne      SHORT G_M902_IG15
 						;; size=11 bbWeight=4 PerfScore 7.00
 G_M902_IG14:
        andn     esi, r8d, esi
        cmp      r13d, 64
-       jae      G_M902_IG26
+       jae      G_M902_IG28
        mov      r8d, r13d
        mov      dword ptr [r14+4*r8], ecx
        inc      r13d
        cmp      ecx, dword ptr [rbx+0x08]
-       jae      G_M902_IG26
+       jae      G_M902_IG28
        mov      r8, gword ptr [rbx+8*rcx+0x10]
        add      edx, dword ptr [r8+0x08]
-       jo       G_M902_IG27
+       jo       G_M902_IG29
        test     esi, esi
        je       SHORT G_M902_IG17
 						;; size=53 bbWeight=2 PerfScore 29.00
 G_M902_IG15:
        dec      ecx
 						;; size=2 bbWeight=4 PerfScore 1.00
 G_M902_IG16:
        cmp      eax, ecx
        jbe      SHORT G_M902_IG17
        mov      r8d, dword ptr [rdi+4*rcx+0x10]
        mov      r9d, ecx
        or       r9d, r8d
        jne      SHORT G_M902_IG13
 						;; size=17 bbWeight=4 PerfScore 19.00
 G_M902_IG17:
        test     esi, esi
-       jne      G_M902_IG20
+       jne      G_M902_IG22
        cmp      r13d, 64
-       ja       G_M902_IG25
+       ja       G_M902_IG27
        lea      edi, [r13+r13]
        add      edi, -2
        add      edi, edx
-       jo       G_M902_IG27
+       jo       G_M902_IG29
        call     System.String:FastAllocateString(int):System.String
        mov      r15, rax
        lea      r12, bword ptr [r15+0x0C]
        mov      eax, dword ptr [r15+0x08]
        lea      edx, [r13-0x01]
        mov      ecx, edx
        test     ecx, ecx
-       je       G_M902_IG19
-						;; size=64 bbWeight=0.50 PerfScore 5.88
+       jne      SHORT G_M902_IG20
+						;; size=60 bbWeight=0.50 PerfScore 5.88
 G_M902_IG18:
+       mov      edx, eax
+       jmp      G_M902_IG21
+						;; size=7 bbWeight=0.25 PerfScore 0.56
+G_M902_IG19:
+       mov      eax, edx
+						;; size=2 bbWeight=2 PerfScore 0.50
+G_M902_IG20:
        cmp      ecx, r13d
-       jae      G_M902_IG26
+       jae      G_M902_IG28
        mov      qword ptr [rbp-0x48], rcx
        mov      edx, dword ptr [r14+4*rcx]
        cmp      edx, dword ptr [rbx+0x08]
-       jae      G_M902_IG26
+       jae      G_M902_IG28
        mov      rsi, gword ptr [rbx+8*rdx+0x10]
        mov      r8d, dword ptr [rsi+0x08]
        mov      dword ptr [rbp-0x3C], r8d
        mov      dword ptr [rbp-0x2C], eax
        cmp      r8d, eax
-       jg       G_M902_IG24
+       jg       G_M902_IG26
        mov      r9d, r8d
        add      r9, r9
        mov      qword ptr [rbp-0x38], r9
        mov      rdx, r9
        add      rsi, 12
        mov      rdi, r12
        mov      r10, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [r10]System.SpanHelpers:Memmove(byref,byref,ulong)
-       mov      r8d, dword ptr [rbp-0x3C]
-       mov      eax, dword ptr [rbp-0x2C]
-       cmp      r8d, eax
-       ja       G_M902_IG25
-       mov      r9, qword ptr [rbp-0x38]
-       add      r12, r9
-       sub      eax, r8d
-       cmp      eax, 2
-       jb       G_M902_IG25
-       lea      rcx, bword ptr [r12+0x04]
-       add      eax, -2
+       mov      edx, dword ptr [rbp-0x3C]
+       mov      esi, dword ptr [rbp-0x2C]
+       cmp      edx, esi
+       ja       G_M902_IG27
+       mov      rdi, qword ptr [rbp-0x38]
+       add      r12, rdi
+       sub      esi, edx
+       mov      edx, esi
+       cmp      edx, 2
+       jb       G_M902_IG27
+       lea      rsi, bword ptr [r12+0x04]
+       add      edx, -2
        mov      word  ptr [r12], 44
        mov      word  ptr [r12+0x02], 32
-       mov      r12, rcx
-       mov      rcx, qword ptr [rbp-0x48]
-       dec      ecx
-       jne      G_M902_IG18
-						;; size=157 bbWeight=4 PerfScore 129.00
-G_M902_IG19:
+       mov      r12, rsi
+       mov      rsi, qword ptr [rbp-0x48]
+       dec      esi
+       mov      rcx, rsi
+       jne      G_M902_IG19
+						;; size=159 bbWeight=4 PerfScore 131.00
+G_M902_IG21:
        test     r13d, r13d
-       je       SHORT G_M902_IG26
-       mov      ecx, dword ptr [r14]
-       cmp      ecx, dword ptr [rbx+0x08]
-       jae      SHORT G_M902_IG26
-       mov      rsi, gword ptr [rbx+8*rcx+0x10]
-       cmp      dword ptr [rsi+0x08], eax
-       jg       SHORT G_M902_IG24
+       je       SHORT G_M902_IG28
+       mov      esi, dword ptr [r14]
+       cmp      esi, dword ptr [rbx+0x08]
+       jae      SHORT G_M902_IG28
+       mov      rsi, gword ptr [rbx+8*rsi+0x10]
+       cmp      dword ptr [rsi+0x08], edx
+       jg       SHORT G_M902_IG26
        mov      edx, dword ptr [rsi+0x08]
        add      rdx, rdx
        add      rsi, 12
        mov      rdi, r12
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
 						;; size=48 bbWeight=0.50 PerfScore 9.62
-G_M902_IG20:
+G_M902_IG22:
        mov      rax, r15
 						;; size=3 bbWeight=1 PerfScore 0.25
-G_M902_IG21:
+G_M902_IG23:
        cmp      qword ptr [rbp-0x50], 0xD1FFAB1E
-       je       SHORT G_M902_IG22
+       je       SHORT G_M902_IG24
        call     CORINFO_HELP_FAIL_FAST
 						;; size=15 bbWeight=1 PerfScore 4.00
-G_M902_IG22:
+G_M902_IG24:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
-G_M902_IG23:
+G_M902_IG25:
        lea      rsp, [rbp-0x28]
        pop      rbx
        pop      r12
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=15 bbWeight=1 PerfScore 4.50
-G_M902_IG24:
+G_M902_IG26:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
-G_M902_IG25:
+G_M902_IG27:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
        call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
-G_M902_IG26:
+G_M902_IG28:
        call     CORINFO_HELP_RNGCHKFAIL
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
-G_M902_IG27:
+G_M902_IG29:
        call     CORINFO_HELP_OVERFLOW
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 618, prolog size 27, PerfScore 272.06, instruction count 174, allocated bytes for code 618 (MethodHash=5deffc79) for method System.Enum:FormatFlagNames[int](System.Enum+EnumInfo`1[int],int):System.String (FullOpts)
+; Total bytes of code 625, prolog size 27, PerfScore 275.12, instruction count 179, allocated bytes for code 625 (MethodHash=5deffc79) for method System.Enum:FormatFlagNames[int](System.Enum+EnumInfo`1[int],int):System.String (FullOpts)
 ; ============================================================

3 (1.60 % of base) - System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendFormattedSlow(System.String):this

 ; Assembly listing for method System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendFormattedSlow(System.String):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 1 single block inlinees; 4 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] ( 11,  7   )   byref  ->  rbx         this single-def
 ;  V01 arg1         [V01,T01] (  6,  4   )     ref  ->  r15         class-hnd single-def <System.String>
 ;# 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[ushort]>
 ;  V04 tmp2         [V04,T04] (  3,  3   )     int  ->  rsi         "Inlining Arg"
-;  V05 tmp3         [V05,T02] (  4,  4   )     int  ->  rcx         "Inlining Arg"
-;  V06 tmp4         [V06,T03] (  3,  3   )   byref  ->  rax         single-def "Inlining Arg"
+;  V05 tmp3         [V05,T02] (  4,  4   )     int  ->  rsi         "Inlining Arg"
+;  V06 tmp4         [V06,T03] (  3,  3   )   byref  ->  rdx         single-def "Inlining Arg"
 ;* V07 tmp5         [V07    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
-;  V08 tmp6         [V08,T06] (  2,  2   )   byref  ->  rdi         single-def "Inlining Arg"
-;  V09 tmp7         [V09,T07] (  2,  2   )     int  ->  rdx         "Inlining Arg"
+;  V08 tmp6         [V08,T06] (  2,  2   )   byref  ->  rax         single-def "Inlining Arg"
+;  V09 tmp7         [V09,T07] (  2,  2   )     int  ->  rdi         "Inlining Arg"
 ;* V10 tmp8         [V10    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V11 tmp9         [V11    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V12 tmp10        [V12    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V13 tmp11        [V13    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V14 tmp12        [V14    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
 ;* V15 tmp13        [V15    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
 ;* V16 tmp14        [V16    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V07._reference (fldOffset=0x0)" P-INDEP
 ;* V17 tmp15        [V17    ] (  0,  0   )     int  ->  zero-ref    "field V07._length (fldOffset=0x8)" P-INDEP
 ;* V18 tmp16        [V18    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V10._reference (fldOffset=0x0)" P-INDEP
 ;* V19 tmp17        [V19    ] (  0,  0   )     int  ->  zero-ref    "field V10._length (fldOffset=0x8)" P-INDEP
-;  V20 cse0         [V20,T08] (  3,  1.50)     int  ->  rdx         "CSE #01: moderate"
+;  V20 cse0         [V20,T08] (  3,  1.50)     int  ->  rdi         "CSE #01: moderate"
 ;  V21 cse1         [V21,T05] (  5,  2.50)     int  ->  r14         "CSE #02: aggressive"
 ;
 ; Lcl frame size = 8
 
 G_M21571_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
        mov      rbx, rdi
        mov      r15, rsi
 						;; size=18 bbWeight=1 PerfScore 6.00
 G_M21571_IG02:
        cmp      byte  ptr [rbx+0x14], 0
        jne      SHORT G_M21571_IG05
 						;; size=6 bbWeight=1 PerfScore 4.00
 G_M21571_IG03:
        test     r15, r15
        je       SHORT G_M21571_IG06
        mov      r14d, dword ptr [r15+0x08]
        mov      esi, r14d
        mov      edi, dword ptr [rbx+0x20]
        sub      edi, dword ptr [rbx+0x10]
        cmp      edi, esi
        jge      SHORT G_M21571_IG04
        mov      rdi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:Grow(int):this
        call     [rax]System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:Grow(int):this
 						;; size=37 bbWeight=0.50 PerfScore 6.62
 G_M21571_IG04:
-       lea      rax, bword ptr [rbx+0x18]
-       mov      ecx, dword ptr [rbx+0x10]
-       mov      edx, dword ptr [rax+0x08]
-       cmp      ecx, edx
+       lea      rdx, bword ptr [rbx+0x18]
+       mov      esi, dword ptr [rbx+0x10]
+       mov      edi, dword ptr [rdx+0x08]
+       cmp      esi, edi
        ja       SHORT G_M21571_IG09
-       mov      rax, bword ptr [rax]
-       mov      edi, ecx
-       lea      rdi, bword ptr [rax+2*rdi]
-       sub      edx, ecx
-       cmp      r14d, edx
+       mov      rdx, bword ptr [rdx]
+       mov      eax, esi
+       lea      rax, bword ptr [rdx+2*rax]
+       sub      edi, esi
+       cmp      r14d, edi
        ja       SHORT G_M21571_IG08
        mov      edx, r14d
        add      rdx, rdx
        lea      rsi, bword ptr [r15+0x0C]
+       mov      rdi, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        add      dword ptr [rbx+0x10], r14d
        jmp      SHORT G_M21571_IG06
-						;; size=58 bbWeight=0.50 PerfScore 9.62
+						;; size=61 bbWeight=0.50 PerfScore 9.75
 G_M21571_IG05:
        mov      rdi, rbx
        mov      rdx, r15
        mov      rsi, 0xD1FFAB1E      ; System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendCustomFormatter[System.String](System.String,System.String):this
        xor      rcx, rcx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendCustomFormatter[System.__Canon](System.__Canon,System.String):this
        call     [rax]System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendCustomFormatter[System.__Canon](System.__Canon,System.String):this
 						;; size=30 bbWeight=0.50 PerfScore 2.12
 G_M21571_IG06:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
 G_M21571_IG07:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
 G_M21571_IG08:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M21571_IG09:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
        call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 187, prolog size 12, PerfScore 31.88, instruction count 58, allocated bytes for code 187 (MethodHash=00faabbc) for method System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendFormattedSlow(System.String):this (FullOpts)
+; Total bytes of code 190, prolog size 12, PerfScore 32.00, instruction count 59, allocated bytes for code 190 (MethodHash=00faabbc) for method System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:AppendFormattedSlow(System.String):this (FullOpts)
 ; ============================================================

3 (2.26 % of base) - System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:GrowThenCopyString(System.String):this

 ; Assembly listing for method System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:GrowThenCopyString(System.String):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 1 single block inlinees; 3 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] (  7,  7   )   byref  ->  rbx         this single-def
 ;  V01 arg1         [V01,T02] (  4,  4   )     ref  ->  r15         class-hnd single-def <System.String>
 ;# 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[ushort]>
-;  V04 tmp2         [V04,T01] (  4,  8   )     int  ->  rcx         "Inlining Arg"
-;  V05 tmp3         [V05,T03] (  3,  6   )   byref  ->  rax         single-def "Inlining Arg"
+;  V04 tmp2         [V04,T01] (  4,  8   )     int  ->  rsi         "Inlining Arg"
+;  V05 tmp3         [V05,T03] (  3,  6   )   byref  ->  rdx         single-def "Inlining Arg"
 ;* V06 tmp4         [V06    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
-;  V07 tmp5         [V07,T05] (  2,  4   )   byref  ->  rdi         single-def "Inlining Arg"
-;  V08 tmp6         [V08,T06] (  2,  4   )     int  ->  rdx         "Inlining Arg"
+;  V07 tmp5         [V07,T05] (  2,  4   )   byref  ->  rax         single-def "Inlining Arg"
+;  V08 tmp6         [V08,T06] (  2,  4   )     int  ->  rdi         "Inlining Arg"
 ;* V09 tmp7         [V09    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V10 tmp8         [V10    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V11 tmp9         [V11    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V12 tmp10        [V12    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V13 tmp11        [V13    ] (  0,  0   )   byref  ->  zero-ref    "field V03._reference (fldOffset=0x0)" P-INDEP
 ;* V14 tmp12        [V14    ] (  0,  0   )     int  ->  zero-ref    "field V03._length (fldOffset=0x8)" P-INDEP
 ;* V15 tmp13        [V15    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V06._reference (fldOffset=0x0)" P-INDEP
 ;* V16 tmp14        [V16    ] (  0,  0   )     int  ->  zero-ref    "field V06._length (fldOffset=0x8)" P-INDEP
 ;* V17 tmp15        [V17    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V09._reference (fldOffset=0x0)" P-INDEP
 ;* V18 tmp16        [V18    ] (  0,  0   )     int  ->  zero-ref    "field V09._length (fldOffset=0x8)" P-INDEP
-;  V19 cse0         [V19,T07] (  3,  3   )     int  ->  rdx         "CSE #01: aggressive"
+;  V19 cse0         [V19,T07] (  3,  3   )     int  ->  rdi         "CSE #01: aggressive"
 ;  V20 cse1         [V20,T04] (  5,  5   )     int  ->  r14         "CSE #02: aggressive"
 ;
 ; Lcl frame size = 8
 
 G_M61046_IG01:
        push     rbp
        push     r15
        push     r14
        push     rbx
        push     rax
        lea      rbp, [rsp+0x20]
        mov      rbx, rdi
        mov      r15, rsi
 						;; size=18 bbWeight=1 PerfScore 6.00
 G_M61046_IG02:
        mov      r14d, dword ptr [r15+0x08]
        mov      esi, r14d
        mov      rdi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:Grow(int):this
        call     [rax]System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:Grow(int):this
-       lea      rax, bword ptr [rbx+0x18]
-       mov      ecx, dword ptr [rbx+0x10]
-       mov      edx, dword ptr [rax+0x08]
-       cmp      ecx, edx
+       lea      rdx, bword ptr [rbx+0x18]
+       mov      esi, dword ptr [rbx+0x10]
+       mov      edi, dword ptr [rdx+0x08]
+       cmp      esi, edi
        ja       SHORT G_M61046_IG05
-       mov      rax, bword ptr [rax]
-       mov      edi, ecx
-       lea      rdi, bword ptr [rax+2*rdi]
-       sub      edx, ecx
-       cmp      r14d, edx
+       mov      rdx, bword ptr [rdx]
+       mov      eax, esi
+       lea      rax, bword ptr [rdx+2*rax]
+       sub      edi, esi
+       cmp      r14d, edi
        ja       SHORT G_M61046_IG04
        mov      edx, r14d
        add      rdx, rdx
        lea      rsi, bword ptr [r15+0x0C]
+       mov      rdi, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        add      dword ptr [rbx+0x10], r14d
-						;; size=78 bbWeight=1 PerfScore 23.00
+						;; size=81 bbWeight=1 PerfScore 23.25
 G_M61046_IG03:
        add      rsp, 8
        pop      rbx
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=11 bbWeight=1 PerfScore 3.25
 G_M61046_IG04:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M61046_IG05:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
        call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 133, prolog size 12, PerfScore 32.25, instruction count 42, allocated bytes for code 133 (MethodHash=5c741189) for method System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:GrowThenCopyString(System.String):this (FullOpts)
+; Total bytes of code 136, prolog size 12, PerfScore 32.50, instruction count 43, allocated bytes for code 136 (MethodHash=5c741189) for method System.Runtime.CompilerServices.DefaultInterpolatedStringHandler:GrowThenCopyString(System.String):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/c83beaaaa32759e7d73125253807dfc0

MihuBot · 2025-01-11T18:09:44Z

Top method improvements

-13 (-13.68 % of base) - System.Text.Json.JsonCamelCaseNamingPolicy+<>c:b__0_0(System.Span`1[ushort],System.String):this

 ; Assembly listing for method System.Text.Json.JsonCamelCaseNamingPolicy+<>c:<ConvertName>b__0_0(System.Span`1[ushort],System.String):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 0 single block inlinees; 2 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def <System.Text.Json.JsonCamelCaseNamingPolicy+<>c>
 ;* V01 arg1         [V01    ] (  0,  0   )  struct (16) zero-ref    multireg-arg single-def <System.Span`1[ushort]>
 ;  V02 arg2         [V02,T00] (  4,  4   )     ref  ->  rcx         class-hnd single-def <System.String>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V05 tmp2         [V05    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V06 tmp3         [V06    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V07 tmp4         [V07    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;  V08 tmp5         [V08,T01] (  3,  3   )   byref  ->  rbx         single-def "field V01._reference (fldOffset=0x0)" P-INDEP
 ;  V09 tmp6         [V09,T02] (  3,  3   )     int  ->  r15         single-def "field V01._length (fldOffset=0x8)" P-INDEP
 ;* V10 tmp7         [V10    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V04._reference (fldOffset=0x0)" P-INDEP
 ;* V11 tmp8         [V11    ] (  0,  0   )     int  ->  zero-ref    "field V04._length (fldOffset=0x8)" P-INDEP
-;  V12 cse0         [V12,T03] (  3,  3   )     int  ->  r14         "CSE #01: aggressive"
+;  V12 cse0         [V12,T03] (  3,  3   )     int  ->  rdx         "CSE #01: aggressive"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 0
 
 G_M52091_IG01:
        push     rbp
        push     r15
-       push     r14
        push     rbx
-       push     rax
-       lea      rbp, [rsp+0x20]
+       lea      rbp, [rsp+0x10]
        mov      rbx, rsi
        mov      r15d, edx
-						;; size=18 bbWeight=1 PerfScore 6.00
+						;; size=15 bbWeight=1 PerfScore 4.00
 G_M52091_IG02:
-       mov      r14d, dword ptr [rcx+0x08]
-       cmp      r14d, r15d
+       mov      edx, dword ptr [rcx+0x08]
+       cmp      edx, r15d
        jg       SHORT G_M52091_IG04
-       mov      edx, r14d
        add      rdx, rdx
        lea      rsi, bword ptr [rcx+0x0C]
        mov      rdi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        mov      rdi, rbx
        mov      esi, r15d
        mov      rax, 0xD1FFAB1E      ; code for System.Text.Json.JsonCamelCaseNamingPolicy:FixCasing(System.Span`1[ushort])
        call     [rax]System.Text.Json.JsonCamelCaseNamingPolicy:FixCasing(System.Span`1[ushort])
        nop      
-						;; size=53 bbWeight=1 PerfScore 11.75
+						;; size=49 bbWeight=1 PerfScore 11.50
 G_M52091_IG03:
-       add      rsp, 8
        pop      rbx
-       pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=11 bbWeight=1 PerfScore 3.25
+						;; size=5 bbWeight=1 PerfScore 2.50
 G_M52091_IG04:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 95, prolog size 12, PerfScore 21.00, instruction count 31, allocated bytes for code 95 (MethodHash=ff1b3484) for method System.Text.Json.JsonCamelCaseNamingPolicy+<>c:<ConvertName>b__0_0(System.Span`1[ushort],System.String):this (FullOpts)
+; Total bytes of code 82, prolog size 9, PerfScore 18.00, instruction count 26, allocated bytes for code 82 (MethodHash=ff1b3484) for method System.Text.Json.JsonCamelCaseNamingPolicy+<>c:<ConvertName>b__0_0(System.Span`1[ushort],System.String):this (FullOpts)
 ; ============================================================

-9 (-14.29 % of base) - System.String:CopyTo(System.Span`1[ushort]):this

 ; Assembly listing for method System.String:CopyTo(System.Span`1[ushort]):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 0 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rdi         this class-hnd single-def <System.String>
 ;* V01 arg1         [V01    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.Span`1[ushort]>
 ;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V03 tmp1         [V03    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V04 tmp2         [V04    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V05 tmp3         [V05    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;  V06 tmp4         [V06,T01] (  2,  2   )   byref  ->  rax         single-def "field V01._reference (fldOffset=0x0)" P-INDEP
 ;  V07 tmp5         [V07,T02] (  2,  2   )     int  ->  rdx         single-def "field V01._length (fldOffset=0x8)" P-INDEP
-;  V08 cse0         [V08,T03] (  3,  3   )     int  ->  rbx         "CSE #01: aggressive"
+;  V08 cse0         [V08,T03] (  3,  3   )     int  ->  rsi         "CSE #01: aggressive"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 0
 
 G_M48522_IG01:
        push     rbp
-       push     rbx
-       push     rax
-       lea      rbp, [rsp+0x10]
+       mov      rbp, rsp
        mov      rax, rsi
-						;; size=11 bbWeight=1 PerfScore 3.75
+						;; size=7 bbWeight=1 PerfScore 1.50
 G_M48522_IG02:
-       mov      ebx, dword ptr [rdi+0x08]
-       cmp      ebx, edx
+       mov      esi, dword ptr [rdi+0x08]
+       cmp      esi, edx
        jg       SHORT G_M48522_IG04
-       mov      edx, ebx
+       mov      edx, esi
        add      rdx, rdx
        lea      rsi, bword ptr [rdi+0x0C]
        mov      rdi, rax
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        nop      
 						;; size=32 bbWeight=1 PerfScore 8.00
 G_M48522_IG03:
-       add      rsp, 8
-       pop      rbx
        pop      rbp
        ret      
-						;; size=7 bbWeight=1 PerfScore 2.25
+						;; size=2 bbWeight=1 PerfScore 1.50
 G_M48522_IG04:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 63, prolog size 8, PerfScore 14.00, instruction count 22, allocated bytes for code 63 (MethodHash=6df64275) for method System.String:CopyTo(System.Span`1[ushort]):this (FullOpts)
+; Total bytes of code 54, prolog size 4, PerfScore 11.00, instruction count 18, allocated bytes for code 54 (MethodHash=6df64275) for method System.String:CopyTo(System.Span`1[ushort]):this (FullOpts)
 ; ============================================================

-8 (-2.80 % of base) - System.Enum:WriteMultipleFoundFlagsNames(System.String[],System.ReadOnlySpan`1[int],System.Span`1[ushort])

 ; Assembly listing for method System.Enum:WriteMultipleFoundFlagsNames(System.String[],System.ReadOnlySpan`1[int],System.Span`1[ushort]) (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 2 single block inlinees; 6 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T10] (  6, 12   )     ref  ->  r14         class-hnd single-def <System.String[]>
 ;* V01 arg1         [V01    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.ReadOnlySpan`1[int]>
 ;* V02 arg2         [V02    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.Span`1[ushort]>
 ;  V03 loc0         [V03,T20] (  2,  2   )     int  ->  rdx        
 ;  V04 loc1         [V04,T11] (  3, 12   )     ref  ->  rsi         class-hnd exact <System.String>
 ;# V05 OutArgs      [V05    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V06 tmp1         [V06    ] (  0,  0   )  struct (16) zero-ref    "impAppendStmt" <System.Span`1[ushort]>
 ;* V07 tmp2         [V07    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V08 tmp3         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V09 tmp4         [V09    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V10 tmp5         [V10    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
-;  V11 tmp6         [V11,T01] (  3, 24   )     int  ->  rcx         "Inlining Arg"
+;  V11 tmp6         [V11,T01] (  3, 24   )     int  ->  rdx         "Inlining Arg"
 ;* V12 tmp7         [V12    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
-;  V13 tmp8         [V13,T00] (  4, 32   )   byref  ->   r8         "Inlining Arg"
+;  V13 tmp8         [V13,T00] (  4, 32   )   byref  ->  rsi         "Inlining Arg"
 ;  V14 tmp9         [V14,T02] (  3, 24   )     int  ->  rbx         "Inlining Arg"
 ;* V15 tmp10        [V15    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
 ;  V16 tmp11        [V16,T08] (  2, 16   )   byref  ->  r15         "Inlining Arg"
 ;  V17 tmp12        [V17,T09] (  2, 16   )     int  ->  rbx         "Inlining Arg"
-;  V18 tmp13        [V18,T17] (  3,  6   )     ref  ->  rsi         class-hnd exact single-def "Inlining Arg" <System.String>
-;* V19 tmp14        [V19    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;* V18 tmp13        [V18    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;  V19 tmp14        [V19,T17] (  3,  6   )     ref  ->  rsi         class-hnd exact single-def "Inlining Arg" <System.String>
 ;* V20 tmp15        [V20    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V21 tmp16        [V21    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V22 tmp17        [V22    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;  V23 tmp18        [V23,T14] (  3,  6   )   byref  ->  r12         single-def "field V01._reference (fldOffset=0x0)" P-INDEP
 ;  V24 tmp19        [V24,T13] (  4,  7   )     int  ->  r13         single-def "field V01._length (fldOffset=0x8)" P-INDEP
 ;  V25 tmp20        [V25,T06] (  5, 14   )   byref  ->  r15         "field V02._reference (fldOffset=0x0)" P-INDEP
 ;  V26 tmp21        [V26,T05] (  6, 18   )     int  ->  rbx         "field V02._length (fldOffset=0x8)" P-INDEP
 ;* V27 tmp22        [V27    ] (  0,  0   )   byref  ->  zero-ref    "field V06._reference (fldOffset=0x0)" P-INDEP
 ;* V28 tmp23        [V28    ] (  0,  0   )     int  ->  zero-ref    "field V06._length (fldOffset=0x8)" P-INDEP
 ;* V29 tmp24        [V29    ] (  0,  0   )   byref  ->  zero-ref    "field V07._reference (fldOffset=0x0)" P-INDEP
 ;* V30 tmp25        [V30    ] (  0,  0   )     int  ->  zero-ref    "field V07._length (fldOffset=0x8)" P-INDEP
 ;* V31 tmp26        [V31    ] (  0,  0   )   byref  ->  zero-ref    "field V12._reference (fldOffset=0x0)" P-INDEP
 ;* V32 tmp27        [V32    ] (  0,  0   )     int  ->  zero-ref    "field V12._length (fldOffset=0x8)" P-INDEP
 ;  V33 tmp28        [V33,T15] (  2,  8   )   byref  ->  r15         "field V15._reference (fldOffset=0x0)" P-INDEP
 ;  V34 tmp29        [V34,T16] (  2,  8   )     int  ->  rbx         "field V15._length (fldOffset=0x8)" P-INDEP
-;* V35 tmp30        [V35    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V19._reference (fldOffset=0x0)" P-INDEP
-;* V36 tmp31        [V36    ] (  0,  0   )     int  ->  zero-ref    "field V19._length (fldOffset=0x8)" P-INDEP
+;* V35 tmp30        [V35    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V18._reference (fldOffset=0x0)" P-INDEP
+;* V36 tmp31        [V36    ] (  0,  0   )     int  ->  zero-ref    "field V18._length (fldOffset=0x8)" P-INDEP
 ;  V37 tmp32        [V37,T03] (  3, 24   )     int  ->  rdx         "index expr"
-;  V38 tmp33        [V38,T18] (  3,  6   )     int  ->  rax         "index expr"
+;  V38 tmp33        [V38,T18] (  3,  6   )     int  ->  rdx         "index expr"
 ;  V39 cse0         [V39,T12] (  3, 12   )    long  ->  [rbp-0x30]  spill-single-def "CSE #03: moderate"
 ;  V40 cse1         [V40,T07] (  4, 16   )     int  ->  [rbp-0x34]  spill-single-def "CSE #01: moderate"
-;  V41 cse2         [V41,T19] (  3,  3   )     int  ->  r14         "CSE #05: moderate"
+;  V41 cse2         [V41,T19] (  3,  3   )     int  ->  rdx         "CSE #05: moderate"
 ;  V42 rat0         [V42,T04] (  7, 22   )    long  ->  [rbp-0x40]  "Widened IV V03"
 ;
 ; Lcl frame size = 24
 
 G_M57347_IG01:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     r12
        push     rbx
        sub      rsp, 24
        lea      rbp, [rsp+0x40]
        mov      r14, rdi
        mov      r12, rsi
        mov      r13d, edx
        mov      r15, rcx
        mov      ebx, r8d
 						;; size=34 bbWeight=1 PerfScore 8.00
 G_M57347_IG02:
        lea      edx, [r13-0x01]
        mov      eax, edx
        test     eax, eax
        je       G_M57347_IG04
 						;; size=14 bbWeight=1 PerfScore 2.00
 G_M57347_IG03:
        cmp      eax, r13d
        jae      G_M57347_IG08
        mov      qword ptr [rbp-0x40], rax
        mov      edx, dword ptr [r12+4*rax]
        cmp      edx, dword ptr [r14+0x08]
        jae      G_M57347_IG08
        mov      rsi, gword ptr [r14+8*rdx+0x10]
        mov      ecx, dword ptr [rsi+0x08]
        mov      dword ptr [rbp-0x34], ecx
        cmp      ecx, ebx
-       jg       G_M57347_IG06
+       jg       G_M57347_IG07
        mov      r8d, ecx
        add      r8, r8
        mov      qword ptr [rbp-0x30], r8
        mov      rdx, r8
        add      rsi, 12
        mov      rdi, r15
        mov      r9, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [r9]System.SpanHelpers:Memmove(byref,byref,ulong)
-       mov      ecx, dword ptr [rbp-0x34]
-       cmp      ecx, ebx
-       ja       G_M57347_IG07
-       mov      r8, qword ptr [rbp-0x30]
-       add      r8, r15
-       sub      ebx, ecx
+       mov      edx, dword ptr [rbp-0x34]
+       cmp      edx, ebx
+       ja       SHORT G_M57347_IG06
+       mov      rsi, qword ptr [rbp-0x30]
+       add      rsi, r15
+       sub      ebx, edx
        cmp      ebx, 2
-       jb       SHORT G_M57347_IG07
-       lea      r15, bword ptr [r8+0x04]
+       jb       SHORT G_M57347_IG06
+       lea      r15, bword ptr [rsi+0x04]
        add      ebx, -2
-       mov      word  ptr [r8], 44
-       mov      word  ptr [r8+0x02], 32
-       mov      rax, qword ptr [rbp-0x40]
-       dec      eax
+       mov      word  ptr [rsi], 44
+       mov      word  ptr [rsi+0x02], 32
+       mov      rdx, qword ptr [rbp-0x40]
+       dec      edx
+       mov      rax, rdx
        jne      G_M57347_IG03
-						;; size=136 bbWeight=4 PerfScore 120.00
+						;; size=133 bbWeight=4 PerfScore 121.00
 G_M57347_IG04:
        test     r13d, r13d
        je       SHORT G_M57347_IG08
-       mov      eax, dword ptr [r12]
-       cmp      eax, dword ptr [r14+0x08]
+       mov      edx, dword ptr [r12]
+       cmp      edx, dword ptr [r14+0x08]
        jae      SHORT G_M57347_IG08
-       mov      rsi, gword ptr [r14+8*rax+0x10]
-       mov      r14d, dword ptr [rsi+0x08]
-       cmp      r14d, ebx
-       jg       SHORT G_M57347_IG06
-       mov      edx, r14d
+       mov      rsi, gword ptr [r14+8*rdx+0x10]
+       mov      edx, dword ptr [rsi+0x08]
+       cmp      edx, ebx
+       jg       SHORT G_M57347_IG07
        add      rdx, rdx
        add      rsi, 12
        mov      rdi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        nop      
-						;; size=55 bbWeight=1 PerfScore 17.00
+						;; size=50 bbWeight=1 PerfScore 16.75
 G_M57347_IG05:
        add      rsp, 24
        pop      rbx
        pop      r12
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=15 bbWeight=1 PerfScore 4.25
 G_M57347_IG06:
-       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
-       call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
+       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
+       call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M57347_IG07:
-       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
-       call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
+       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
+       call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M57347_IG08:
        call     CORINFO_HELP_RNGCHKFAIL
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 286, prolog size 19, PerfScore 151.25, instruction count 83, allocated bytes for code 286 (MethodHash=81621ffc) for method System.Enum:WriteMultipleFoundFlagsNames(System.String[],System.ReadOnlySpan`1[int],System.Span`1[ushort]) (FullOpts)
+; Total bytes of code 278, prolog size 19, PerfScore 152.00, instruction count 83, allocated bytes for code 278 (MethodHash=81621ffc) for method System.Enum:WriteMultipleFoundFlagsNames(System.String[],System.ReadOnlySpan`1[int],System.Span`1[ushort]) (FullOpts)
 ; ============================================================

-8 (-4.21 % of base) - System.Xml.Serialization.CodeIdentifier+<>c:b__3_0(System.Span`1[ushort],System.String):this

 ; Assembly listing for method System.Xml.Serialization.CodeIdentifier+<>c:<MakeCamel>b__3_0(System.Span`1[ushort],System.String):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 10 single block inlinees; 7 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def <System.Xml.Serialization.CodeIdentifier+<>c>
 ;* V01 arg1         [V01    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.Span`1[ushort]>
 ;  V02 arg2         [V02,T01] (  4,  4   )     ref  ->  rcx         class-hnd single-def <System.String>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )   byref  ->  zero-ref    single-def "impAppendStmt"
 ;* V05 tmp2         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V06 tmp3         [V06    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V07 tmp4         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V08 tmp5         [V08    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;  V09 tmp6         [V09,T00] (  5,  7   )  ushort  ->  r15         "Inlining Arg"
 ;  V10 tmp7         [V10,T06] (  3,  2   )  ushort  ->  rax         "Inline return value spill temp"
 ;  V11 tmp8         [V11,T03] (  5,  5   )  ushort  ->  rax         "Inlining Arg"
 ;* V12 tmp9         [V12    ] (  0,  0   )  ushort  ->  zero-ref    "Inline return value spill temp"
 ;* V13 tmp10        [V13    ] (  0,  0   )    long  ->  zero-ref    "Inline stloc first use temp"
 ;* V14 tmp11        [V14    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.ReadOnlySpan`1[ubyte]>
 ;* V15 tmp12        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inline stloc first use temp"
 ;* V16 tmp13        [V16    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[ubyte]>
 ;* V17 tmp14        [V17    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[ubyte]>
-;  V18 tmp15        [V18    ] (  3,  1.50)  ushort  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op "Inline stloc first use temp"
+;  V18 tmp15        [V18    ] (  3,  1.50)  ushort  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op "Inline stloc first use temp"
 ;  V19 tmp16        [V19,T07] (  2,  2   )     ref  ->  rdi         class-hnd exact single-def "Inlining Arg" <System.Globalization.TextInfo>
-;  V20 tmp17        [V20    ] (  2,  2   )  ushort  ->  [rbp-0x28]  do-not-enreg[X] addr-exposed ld-addr-op "Inlining Arg"
+;  V20 tmp17        [V20    ] (  2,  2   )  ushort  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op "Inlining Arg"
 ;  V21 tmp18        [V21,T02] (  4,  4   )   byref  ->  rbx         single-def "field V01._reference (fldOffset=0x0)" P-INDEP
 ;  V22 tmp19        [V22,T04] (  3,  3   )     int  ->  r15         single-def "field V01._length (fldOffset=0x8)" P-INDEP
 ;* V23 tmp20        [V23    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V05._reference (fldOffset=0x0)" P-INDEP
 ;* V24 tmp21        [V24    ] (  0,  0   )     int  ->  zero-ref    "field V05._length (fldOffset=0x8)" P-INDEP
 ;* V25 tmp22        [V25    ] (  0,  0   )   byref  ->  zero-ref    "field V14._reference (fldOffset=0x0)" P-INDEP
 ;* V26 tmp23        [V26    ] (  0,  0   )     int  ->  zero-ref    "field V14._length (fldOffset=0x8)" P-INDEP
 ;* V27 tmp24        [V27    ] (  0,  0   )   byref  ->  zero-ref    "field V16._reference (fldOffset=0x0)" P-INDEP
 ;* V28 tmp25        [V28    ] (  0,  0   )     int  ->  zero-ref    "field V16._length (fldOffset=0x8)" P-INDEP
 ;* V29 tmp26        [V29    ] (  0,  0   )   byref  ->  zero-ref    "field V17._reference (fldOffset=0x0)" P-INDEP
 ;* V30 tmp27        [V30    ] (  0,  0   )     int  ->  zero-ref    "field V17._length (fldOffset=0x8)" P-INDEP
-;  V31 cse0         [V31,T05] (  3,  3   )     int  ->  r14         "CSE #01: aggressive"
+;  V31 cse0         [V31,T05] (  3,  3   )     int  ->  rdx         "CSE #01: aggressive"
 ;
-; Lcl frame size = 24
+; Lcl frame size = 16
 
 G_M44984_IG01:
        push     rbp
        push     r15
-       push     r14
        push     rbx
-       sub      rsp, 24
-       lea      rbp, [rsp+0x30]
+       sub      rsp, 16
+       lea      rbp, [rsp+0x20]
        mov      rbx, rsi
        mov      r15d, edx
-						;; size=21 bbWeight=1 PerfScore 5.25
+						;; size=19 bbWeight=1 PerfScore 4.25
 G_M44984_IG02:
-       mov      r14d, dword ptr [rcx+0x08]
-       cmp      r14d, r15d
+       mov      edx, dword ptr [rcx+0x08]
+       cmp      edx, r15d
        jg       G_M44984_IG07
-       mov      edx, r14d
        add      rdx, rdx
        lea      rsi, bword ptr [rcx+0x0C]
        mov      rdi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        test     r15d, r15d
        je       SHORT G_M44984_IG08
        movzx    r15, word  ptr [rbx]
        cmp      r15d, 127
        jle      SHORT G_M44984_IG04
-						;; size=53 bbWeight=1 PerfScore 12.25
+						;; size=49 bbWeight=1 PerfScore 12.00
 G_M44984_IG03:
        mov      rcx, 0xD1FFAB1E      ; const ptr
        mov      rdi, gword ptr [rcx]
-       mov      word  ptr [rbp-0x28], r15w
+       mov      word  ptr [rbp-0x20], r15w
        xor      ecx, ecx
-       mov      dword ptr [rbp-0x20], ecx
-       lea      rcx, [rbp-0x20]
-       lea      rsi, [rbp-0x28]
+       mov      dword ptr [rbp-0x18], ecx
+       lea      rcx, [rbp-0x18]
+       lea      rsi, [rbp-0x20]
        mov      edx, 1
        mov      r8d, 1
        xor      r9d, r9d
        mov      rax, 0xD1FFAB1E      ; code for System.Globalization.TextInfo:IcuChangeCase(ulong,int,ulong,int,ubyte):this
        call     [rax]System.Globalization.TextInfo:IcuChangeCase(ulong,int,ulong,int,ubyte):this
-       movzx    rax, word  ptr [rbp-0x20]
+       movzx    rax, word  ptr [rbp-0x18]
        jmp      SHORT G_M44984_IG05
 						;; size=63 bbWeight=0.50 PerfScore 6.25
 G_M44984_IG04:
        mov      eax, r15d
        lea      ecx, [rax-0x41]
        or       r15d, 32
        movzx    rdx, r15b
        cmp      ecx, 25
        cmovbe   eax, edx
 						;; size=20 bbWeight=0.50 PerfScore 0.88
 G_M44984_IG05:
        mov      word  ptr [rbx], ax
 						;; size=3 bbWeight=1 PerfScore 1.00
 G_M44984_IG06:
-       add      rsp, 24
+       add      rsp, 16
        pop      rbx
-       pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=11 bbWeight=1 PerfScore 3.25
+						;; size=9 bbWeight=1 PerfScore 2.75
 G_M44984_IG07:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M44984_IG08:
        call     CORINFO_HELP_RNGCHKFAIL
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 190, prolog size 15, PerfScore 28.88, instruction count 54, allocated bytes for code 190 (MethodHash=f2a85047) for method System.Xml.Serialization.CodeIdentifier+<>c:<MakeCamel>b__3_0(System.Span`1[ushort],System.String):this (FullOpts)
+; Total bytes of code 182, prolog size 13, PerfScore 27.12, instruction count 51, allocated bytes for code 182 (MethodHash=f2a85047) for method System.Xml.Serialization.CodeIdentifier+<>c:<MakeCamel>b__3_0(System.Span`1[ushort],System.String):this (FullOpts)
 ; ============================================================

-8 (-4.21 % of base) - System.Xml.Serialization.CodeIdentifier+<>c:b__2_0(System.Span`1[ushort],System.String):this

 ; Assembly listing for method System.Xml.Serialization.CodeIdentifier+<>c:<MakePascal>b__2_0(System.Span`1[ushort],System.String):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 10 single block inlinees; 7 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def <System.Xml.Serialization.CodeIdentifier+<>c>
 ;* V01 arg1         [V01    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.Span`1[ushort]>
 ;  V02 arg2         [V02,T01] (  4,  4   )     ref  ->  rcx         class-hnd single-def <System.String>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )   byref  ->  zero-ref    single-def "impAppendStmt"
 ;* V05 tmp2         [V05    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V06 tmp3         [V06    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V07 tmp4         [V07    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V08 tmp5         [V08    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;  V09 tmp6         [V09,T00] (  5,  7   )  ushort  ->  r15         "Inlining Arg"
 ;  V10 tmp7         [V10,T06] (  3,  2   )  ushort  ->  rax         "Inline return value spill temp"
 ;  V11 tmp8         [V11,T03] (  5,  5   )  ushort  ->  rax         "Inlining Arg"
 ;* V12 tmp9         [V12    ] (  0,  0   )  ushort  ->  zero-ref    "Inline return value spill temp"
 ;* V13 tmp10        [V13    ] (  0,  0   )    long  ->  zero-ref    "Inline stloc first use temp"
 ;* V14 tmp11        [V14    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.ReadOnlySpan`1[ubyte]>
 ;* V15 tmp12        [V15    ] (  0,  0   )   byref  ->  zero-ref    "Inline stloc first use temp"
 ;* V16 tmp13        [V16    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[ubyte]>
 ;* V17 tmp14        [V17    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[ubyte]>
-;  V18 tmp15        [V18    ] (  3,  1.50)  ushort  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op "Inline stloc first use temp"
+;  V18 tmp15        [V18    ] (  3,  1.50)  ushort  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed ld-addr-op "Inline stloc first use temp"
 ;  V19 tmp16        [V19,T07] (  2,  2   )     ref  ->  rdi         class-hnd exact single-def "Inlining Arg" <System.Globalization.TextInfo>
-;  V20 tmp17        [V20    ] (  2,  2   )  ushort  ->  [rbp-0x28]  do-not-enreg[X] addr-exposed ld-addr-op "Inlining Arg"
+;  V20 tmp17        [V20    ] (  2,  2   )  ushort  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed ld-addr-op "Inlining Arg"
 ;  V21 tmp18        [V21,T02] (  4,  4   )   byref  ->  rbx         single-def "field V01._reference (fldOffset=0x0)" P-INDEP
 ;  V22 tmp19        [V22,T04] (  3,  3   )     int  ->  r15         single-def "field V01._length (fldOffset=0x8)" P-INDEP
 ;* V23 tmp20        [V23    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V05._reference (fldOffset=0x0)" P-INDEP
 ;* V24 tmp21        [V24    ] (  0,  0   )     int  ->  zero-ref    "field V05._length (fldOffset=0x8)" P-INDEP
 ;* V25 tmp22        [V25    ] (  0,  0   )   byref  ->  zero-ref    "field V14._reference (fldOffset=0x0)" P-INDEP
 ;* V26 tmp23        [V26    ] (  0,  0   )     int  ->  zero-ref    "field V14._length (fldOffset=0x8)" P-INDEP
 ;* V27 tmp24        [V27    ] (  0,  0   )   byref  ->  zero-ref    "field V16._reference (fldOffset=0x0)" P-INDEP
 ;* V28 tmp25        [V28    ] (  0,  0   )     int  ->  zero-ref    "field V16._length (fldOffset=0x8)" P-INDEP
 ;* V29 tmp26        [V29    ] (  0,  0   )   byref  ->  zero-ref    "field V17._reference (fldOffset=0x0)" P-INDEP
 ;* V30 tmp27        [V30    ] (  0,  0   )     int  ->  zero-ref    "field V17._length (fldOffset=0x8)" P-INDEP
-;  V31 cse0         [V31,T05] (  3,  3   )     int  ->  r14         "CSE #01: aggressive"
+;  V31 cse0         [V31,T05] (  3,  3   )     int  ->  rdx         "CSE #01: aggressive"
 ;
-; Lcl frame size = 24
+; Lcl frame size = 16
 
 G_M7923_IG01:
        push     rbp
        push     r15
-       push     r14
        push     rbx
-       sub      rsp, 24
-       lea      rbp, [rsp+0x30]
+       sub      rsp, 16
+       lea      rbp, [rsp+0x20]
        mov      rbx, rsi
        mov      r15d, edx
-						;; size=21 bbWeight=1 PerfScore 5.25
+						;; size=19 bbWeight=1 PerfScore 4.25
 G_M7923_IG02:
-       mov      r14d, dword ptr [rcx+0x08]
-       cmp      r14d, r15d
+       mov      edx, dword ptr [rcx+0x08]
+       cmp      edx, r15d
        jg       G_M7923_IG07
-       mov      edx, r14d
        add      rdx, rdx
        lea      rsi, bword ptr [rcx+0x0C]
        mov      rdi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        test     r15d, r15d
        je       SHORT G_M7923_IG08
        movzx    r15, word  ptr [rbx]
        cmp      r15d, 127
        jle      SHORT G_M7923_IG04
-						;; size=53 bbWeight=1 PerfScore 12.25
+						;; size=49 bbWeight=1 PerfScore 12.00
 G_M7923_IG03:
        mov      rcx, 0xD1FFAB1E      ; const ptr
        mov      rdi, gword ptr [rcx]
-       mov      word  ptr [rbp-0x28], r15w
+       mov      word  ptr [rbp-0x20], r15w
        xor      ecx, ecx
-       mov      dword ptr [rbp-0x20], ecx
-       lea      rcx, [rbp-0x20]
-       lea      rsi, [rbp-0x28]
+       mov      dword ptr [rbp-0x18], ecx
+       lea      rcx, [rbp-0x18]
+       lea      rsi, [rbp-0x20]
        mov      edx, 1
        mov      r8d, 1
        mov      r9d, 1
        mov      rax, 0xD1FFAB1E      ; code for System.Globalization.TextInfo:IcuChangeCase(ulong,int,ulong,int,ubyte):this
        call     [rax]System.Globalization.TextInfo:IcuChangeCase(ulong,int,ulong,int,ubyte):this
-       movzx    rax, word  ptr [rbp-0x20]
+       movzx    rax, word  ptr [rbp-0x18]
        jmp      SHORT G_M7923_IG05
 						;; size=66 bbWeight=0.50 PerfScore 6.25
 G_M7923_IG04:
        mov      eax, r15d
        lea      ecx, [rax-0x61]
        and      r15d, 95
        cmp      ecx, 25
        cmovbe   eax, r15d
 						;; size=17 bbWeight=0.50 PerfScore 0.75
 G_M7923_IG05:
        mov      word  ptr [rbx], ax
 						;; size=3 bbWeight=1 PerfScore 1.00
 G_M7923_IG06:
-       add      rsp, 24
+       add      rsp, 16
        pop      rbx
-       pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=11 bbWeight=1 PerfScore 3.25
+						;; size=9 bbWeight=1 PerfScore 2.75
 G_M7923_IG07:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M7923_IG08:
        call     CORINFO_HELP_RNGCHKFAIL
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 190, prolog size 15, PerfScore 28.75, instruction count 53, allocated bytes for code 190 (MethodHash=1ba3e10c) for method System.Xml.Serialization.CodeIdentifier+<>c:<MakePascal>b__2_0(System.Span`1[ushort],System.String):this (FullOpts)
+; Total bytes of code 182, prolog size 13, PerfScore 27.00, instruction count 50, allocated bytes for code 182 (MethodHash=1ba3e10c) for method System.Xml.Serialization.CodeIdentifier+<>c:<MakePascal>b__2_0(System.Span`1[ushort],System.String):this (FullOpts)
 ; ============================================================

-4 (-1.73 % of base) - System.Xml.XmlEntityReference+<>c:b__27_0(System.Span`1[ushort],System.ValueTuple`2[System.String,System.String]):this

 ; Assembly listing for method System.Xml.XmlEntityReference+<>c:<ConstructBaseURI>b__27_0(System.Span`1[ushort],System.ValueTuple`2[System.String,System.String]):this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX512 - Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
 ; 0 inlinees with PGO data; 6 single block inlinees; 5 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def <System.Xml.XmlEntityReference+<>c>
 ;* V01 arg1         [V01    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.Span`1[ushort]>
 ;* V02 arg2         [V02    ] (  0,  0   )  struct (16) zero-ref    multireg-arg single-def <System.ValueTuple`2[System.String,System.String]>
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;* V04 tmp1         [V04    ] (  0,  0   )  struct (16) zero-ref    "impAppendStmt" <System.ReadOnlySpan`1[ushort]>
 ;* V05 tmp2         [V05    ] (  0,  0   )  struct (16) zero-ref    "spilled call-like call argument" <System.Span`1[ushort]>
-;* V06 tmp3         [V06    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "Inlining Arg" <System.__Canon>
-;* V07 tmp4         [V07    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;* V06 tmp3         [V06    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
+;* V07 tmp4         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "Inlining Arg" <System.__Canon>
 ;* V08 tmp5         [V08    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V09 tmp6         [V09    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V10 tmp7         [V10    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V11 tmp8         [V11    ] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def "Inlining Arg" <System.__Canon>
 ;* V12 tmp9         [V12    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[ushort]>
 ;* V13 tmp10        [V13    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inline ldloca(s) first use temp" <System.ReadOnlySpan`1[ushort]>
 ;  V14 tmp11        [V14,T13] (  2,  2   )   byref  ->  rdi         single-def "Inlining Arg"
 ;  V15 tmp12        [V15,T14] (  2,  2   )     int  ->  rsi         "Inlining Arg"
 ;  V16 tmp13        [V16,T01] (  3,  6   )     int  ->  r13         "Inlining Arg"
 ;* V17 tmp14        [V17    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[ushort]>
 ;  V18 tmp15        [V18,T06] (  3,  4   )   byref  ->  r12         single-def "Inlining Arg"
 ;  V19 tmp16        [V19,T07] (  3,  4   )     int  ->  rbx         "Inlining Arg"
 ;* V20 tmp17        [V20    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[ushort]>
 ;  V21 tmp18        [V21,T08] (  4,  3   )    long  ->   r8         "Inline stloc first use temp"
 ;* V22 tmp19        [V22    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V23 tmp20        [V23    ] (  0,  0   )   byref  ->  zero-ref    single-def "Inline stloc first use temp"
 ;* V24 tmp21        [V24    ] (  0,  0   )   byref  ->  zero-ref    single-def "Inline stloc first use temp"
 ;  V25 tmp22        [V25,T12] (  4,  2   )    long  ->  rdx         "Inline stloc first use temp"
 ;* V26 tmp23        [V26    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[ushort]>
 ;* V27 tmp24        [V27    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;  V28 tmp25        [V28,T03] (  3,  3   )   byref  ->  r14         single-def "field V01._reference (fldOffset=0x0)" P-INDEP
 ;  V29 tmp26        [V29,T00] (  4,  4   )     int  ->  rbx         single-def "field V01._length (fldOffset=0x8)" P-INDEP
 ;  V30 tmp27        [V30,T04] (  3,  3   )     ref  ->  rcx         single-def "field V02.Item1 (fldOffset=0x0)" P-INDEP
 ;  V31 tmp28        [V31,T02] (  4,  3   )     ref  ->  r15         single-def "field V02.Item2 (fldOffset=0x8)" P-INDEP
 ;  V32 tmp29        [V32,T11] (  4,  2   )   byref  ->  rdi         "field V04._reference (fldOffset=0x0)" P-INDEP
 ;  V33 tmp30        [V33,T10] (  4,  2.50)     int  ->  rsi         "field V04._length (fldOffset=0x8)" P-INDEP
 ;* V34 tmp31        [V34    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V05._reference (fldOffset=0x0)" P-INDEP
 ;* V35 tmp32        [V35    ] (  0,  0   )     int  ->  zero-ref    "field V05._length (fldOffset=0x8)" P-INDEP
-;* V36 tmp33        [V36    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V07._reference (fldOffset=0x0)" P-INDEP
-;* V37 tmp34        [V37    ] (  0,  0   )     int  ->  zero-ref    "field V07._length (fldOffset=0x8)" P-INDEP
+;* V36 tmp33        [V36    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V06._reference (fldOffset=0x0)" P-INDEP
+;* V37 tmp34        [V37    ] (  0,  0   )     int  ->  zero-ref    "field V06._length (fldOffset=0x8)" P-INDEP
 ;  V38 tmp35        [V38,T15] (  2,  1   )   byref  ->  rdi         single-def "field V12._reference (fldOffset=0x0)" P-INDEP
 ;  V39 tmp36        [V39,T16] (  2,  1   )     int  ->  rsi         "field V12._length (fldOffset=0x8)" P-INDEP
 ;* V40 tmp37        [V40    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V13._reference (fldOffset=0x0)" P-INDEP
 ;* V41 tmp38        [V41    ] (  0,  0   )     int  ->  zero-ref    "field V13._length (fldOffset=0x8)" P-INDEP
 ;* V42 tmp39        [V42    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V17._reference (fldOffset=0x0)" P-INDEP
 ;* V43 tmp40        [V43    ] (  0,  0   )     int  ->  zero-ref    "field V17._length (fldOffset=0x8)" P-INDEP
 ;* V44 tmp41        [V44    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V20._reference (fldOffset=0x0)" P-INDEP
 ;* V45 tmp42        [V45    ] (  0,  0   )     int  ->  zero-ref    "field V20._length (fldOffset=0x8)" P-INDEP
 ;* V46 tmp43        [V46    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V22._reference (fldOffset=0x0)" P-INDEP
 ;* V47 tmp44        [V47    ] (  0,  0   )     int  ->  zero-ref    "field V22._length (fldOffset=0x8)" P-INDEP
 ;* V48 tmp45        [V48    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V26._reference (fldOffset=0x0)" P-INDEP
 ;* V49 tmp46        [V49    ] (  0,  0   )     int  ->  zero-ref    "field V26._length (fldOffset=0x8)" P-INDEP
 ;* V50 tmp47        [V50    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V27._reference (fldOffset=0x0)" P-INDEP
 ;* V51 tmp48        [V51    ] (  0,  0   )     int  ->  zero-ref    "field V27._length (fldOffset=0x8)" P-INDEP
 ;  V52 cse0         [V52,T09] (  3,  3   )    long  ->  r12         "CSE #03: moderate"
 ;  V53 cse1         [V53,T05] (  4,  4   )     int  ->  r13         "CSE #01: moderate"
 ;
 ; Lcl frame size = 8
 
 G_M30333_IG01:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     r12
        push     rbx
        push     rax
        lea      rbp, [rsp+0x30]
        mov      r14, rsi
        mov      ebx, edx
        mov      r15, r8
 						;; size=24 bbWeight=1 PerfScore 8.25
 G_M30333_IG02:
        mov      r13d, dword ptr [rcx+0x08]
        cmp      r13d, ebx
-       jg       G_M30333_IG11
+       jg       G_M30333_IG12
        lea      rsi, bword ptr [rcx+0x0C]
        mov      r12d, r13d
        add      r12, r12
        mov      rdx, r12
        mov      rdi, r14
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
        test     r15, r15
        je       SHORT G_M30333_IG04
 						;; size=46 bbWeight=1 PerfScore 9.25
 G_M30333_IG03:
        lea      rdi, bword ptr [r15+0x0C]
        mov      esi, dword ptr [r15+0x08]
        jmp      SHORT G_M30333_IG05
 						;; size=10 bbWeight=0.50 PerfScore 2.25
 G_M30333_IG04:
        xor      rdi, rdi
        xor      esi, esi
 						;; size=4 bbWeight=0.50 PerfScore 0.25
 G_M30333_IG05:
        cmp      r13d, ebx
-       ja       G_M30333_IG12
+       ja       SHORT G_M30333_IG11
        add      r12, r14
        sub      ebx, r13d
        mov      r8d, esi
        test     r8, r8
        je       SHORT G_M30333_IG08
-						;; size=23 bbWeight=1 PerfScore 3.25
+						;; size=19 bbWeight=1 PerfScore 3.25
 G_M30333_IG06:
        mov      edx, ebx
        cmp      r8, rdx
-       ja       SHORT G_M30333_IG11
+       ja       SHORT G_M30333_IG12
        mov      rdx, r12
        sub      rdx, rdi
        je       SHORT G_M30333_IG07
        mov      esi, esi
        add      rsi, rsi
        cmp      rdx, rsi
        jb       SHORT G_M30333_IG10
        movsxd   rsi, ebx
        add      rsi, rsi
        neg      rsi
        cmp      rsi, rdx
        jb       SHORT G_M30333_IG10
 						;; size=39 bbWeight=0.50 PerfScore 3.38
 G_M30333_IG07:
        mov      rsi, r12
        mov      edx, 92
        mov      ecx, 47
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:ReplaceValueType[ushort](byref,byref,ushort,ushort,ulong)
        call     [rax]System.SpanHelpers:ReplaceValueType[ushort](byref,byref,ushort,ushort,ulong)
 						;; size=25 bbWeight=0.50 PerfScore 2.00
 G_M30333_IG08:
        nop      
 						;; size=1 bbWeight=1 PerfScore 0.25
 G_M30333_IG09:
        add      rsp, 8
        pop      rbx
        pop      r12
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=15 bbWeight=1 PerfScore 4.25
 G_M30333_IG10:
        mov      edi, 72
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException(int)
        call     [rax]System.ThrowHelper:ThrowArgumentException(int)
        int3     
 						;; size=18 bbWeight=0 PerfScore 0.00
 G_M30333_IG11:
-       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
-       call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
-       int3     
-						;; size=13 bbWeight=0 PerfScore 0.00
-G_M30333_IG12:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
        call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
+G_M30333_IG12:
+       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
+       call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
+       int3     
+						;; size=13 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 231, prolog size 16, PerfScore 33.12, instruction count 74, allocated bytes for code 231 (MethodHash=8f5d8982) for method System.Xml.XmlEntityReference+<>c:<ConstructBaseURI>b__27_0(System.Span`1[ushort],System.ValueTuple`2[System.String,System.String]):this (FullOpts)
+; Total bytes of code 227, prolog size 16, PerfScore 33.12, instruction count 74, allocated bytes for code 227 (MethodHash=8f5d8982) for method System.Xml.XmlEntityReference+<>c:<ConstructBaseURI>b__27_0(System.Span`1[ushort],System.ValueTuple`2[System.String,System.String]):this (FullOpts)
 ; ============================================================

-2 (-0.63 % of base) - System.Number+<>c:b__17_0(System.Span`1[ushort],System.ValueTuple`4[int,long,int,System.String]):this

 ; Assembly listing for method System.Number+<>c:<FormatBigInteger>b__17_0(System.Span`1[ushort],System.ValueTuple`4[int,long,int,System.String]):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; 9 single block inlinees; 6 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def <System.Number+<>c>
 ;* V01 arg1         [V01    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op single-def <System.Span`1[ushort]>
 ;  V02 arg2         [V02,T24] (  4,  4   )  struct (24) [rbp+0x10]  do-not-enreg[SF] single-def <System.ValueTuple`4[int,long,int,System.String]>
-;  V03 loc0         [V03    ] (  2,  2   )   byref  ->  [rbp-0x20]  must-init pinned
+;  V03 loc0         [V03    ] (  2,  2   )   byref  ->  [rbp-0x18]  must-init pinned
 ;# V04 OutArgs      [V04    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V05 tmp1         [V05,T17] (  5,  7   )     ref  ->  r14         class-hnd single-def "dup spill" <System.__Canon>
+;  V05 tmp1         [V05,T17] (  5,  7   )     ref  ->  rdx         class-hnd single-def "dup spill" <System.__Canon>
 ;* V06 tmp2         [V06    ] (  0,  0   )     ref  ->  zero-ref    single-def
 ;* V07 tmp3         [V07    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[uint]>
 ;  V08 tmp4         [V08,T25] (  2,  4   )    long  ->  rax         "impAppendStmt"
 ;* V09 tmp5         [V09    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;* V10 tmp6         [V10    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V11 tmp7         [V11    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
 ;* V12 tmp8         [V12    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V13 tmp9         [V13    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[ushort]>
 ;  V14 tmp10        [V14,T20] (  3,  6   )     int  ->  rcx         "Inlining Arg"
 ;* V15 tmp11        [V15    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
 ;* V16 tmp12        [V16,T30] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
 ;* V17 tmp13        [V17    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.ReadOnlySpan`1[uint]>
 ;  V18 tmp14        [V18,T10] (  4, 20   )    long  ->  rax         "Inlining Arg"
 ;  V19 tmp15        [V19,T11] (  4, 20   )     int  ->  rdi         "Inlining Arg"
 ;  V20 tmp16        [V20,T21] (  3,  6   )     int  ->   r8         "Span.get_Item index"
 ;  V21 tmp17        [V21,T00] (  6,144   )     int  ->  registers   "Inlining Arg"
 ;  V22 tmp18        [V22,T01] (  4,136   )     int  ->  r10         "Inlining Arg"
 ;* V23 tmp19        [V23    ] (  0,  0   )  struct ( 8) zero-ref    "dup spill" <System.ValueTuple`2[uint,uint]>
 ;* V24 tmp20        [V24    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
 ;  V25 tmp21        [V25,T02] (  5,112   )    long  ->  rax         "Inlining Arg"
 ;  V26 tmp22        [V26,T03] (  2, 64   )    long  ->  rax         "dup spill"
 ;  V27 tmp23        [V27,T04] (  3, 48   )     int  ->  r11         "Inline stloc first use temp"
 ;* V28 tmp24        [V28    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.ValueTuple`2[uint,uint]>
 ;* V29 tmp25        [V29    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V30 tmp26        [V30    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V31 tmp27        [V31    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Utf16Char>
 ;* V32 tmp28        [V32    ] (  0,  0   )  ushort  ->  zero-ref    "Inlining Arg"
 ;  V33 tmp29        [V33,T05] (  6, 36   )     int  ->  registers   "Inlining Arg"
 ;  V34 tmp30        [V34,T06] (  4, 34   )     int  ->  rdx         "Inlining Arg"
 ;* V35 tmp31        [V35    ] (  0,  0   )  struct ( 8) zero-ref    "dup spill" <System.ValueTuple`2[uint,uint]>
 ;* V36 tmp32        [V36    ] (  0,  0   )     int  ->  zero-ref    "Inline stloc first use temp"
 ;  V37 tmp33        [V37,T09] (  4, 26   )    long  ->  rax         "Inlining Arg"
 ;  V38 tmp34        [V38,T13] (  2, 16   )    long  ->  rax         "dup spill"
 ;  V39 tmp35        [V39,T14] (  3, 12   )     int  ->  rdi         "Inline stloc first use temp"
 ;* V40 tmp36        [V40    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.ValueTuple`2[uint,uint]>
 ;* V41 tmp37        [V41    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V42 tmp38        [V42    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V43 tmp39        [V43    ] (  0,  0   )  struct ( 8) zero-ref    ld-addr-op "NewObj constructor temp" <System.Utf16Char>
 ;* V44 tmp40        [V44    ] (  0,  0   )  ushort  ->  zero-ref    "Inlining Arg"
 ;  V45 tmp41        [V45,T22] (  4,  3.50)   byref  ->  rbx         single-def "field V01._reference (fldOffset=0x0)" P-INDEP
 ;  V46 tmp42        [V46,T23] (  3,  2.50)     int  ->  r15         single-def "field V01._length (fldOffset=0x8)" P-INDEP
 ;  V47 tmp43        [V47,T28] (  2,  2   )   byref  ->  rdx         single-def "field V07._reference (fldOffset=0x0)" P-INDEP
 ;  V48 tmp44        [V48,T29] (  2,  2   )     int  ->  rcx         "field V07._length (fldOffset=0x8)" P-INDEP
 ;* V49 tmp45        [V49    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V09._reference (fldOffset=0x0)" P-INDEP
 ;* V50 tmp46        [V50    ] (  0,  0   )     int  ->  zero-ref    "field V09._length (fldOffset=0x8)" P-INDEP
 ;* V51 tmp47        [V51    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V13._reference (fldOffset=0x0)" P-INDEP
 ;* V52 tmp48        [V52    ] (  0,  0   )     int  ->  zero-ref    "field V13._length (fldOffset=0x8)" P-INDEP
 ;  V53 tmp49        [V53,T19] (  3,  6   )   byref  ->  rdx         single-def "field V17._reference (fldOffset=0x0)" P-INDEP
 ;  V54 tmp50        [V54,T27] (  3,  3   )     int  ->  rcx         "field V17._length (fldOffset=0x8)" P-INDEP
 ;* V55 tmp51        [V55    ] (  0,  0   )     int  ->  zero-ref    "field V23.Item1 (fldOffset=0x0)" P-INDEP
 ;* V56 tmp52        [V56    ] (  0,  0   )     int  ->  zero-ref    "field V23.Item2 (fldOffset=0x4)" P-INDEP
 ;* V57 tmp53        [V57    ] (  0,  0   )     int  ->  zero-ref    "field V28.Item1 (fldOffset=0x0)" P-INDEP
 ;  V58 tmp54        [V58,T07] (  2, 32   )     int  ->   r9         "field V28.Item2 (fldOffset=0x4)" P-INDEP
 ;  V59 tmp55        [V59,T08] (  2, 32   )  ushort  ->   r9         "field V31.value (fldOffset=0x0)" P-INDEP
 ;* V60 tmp56        [V60    ] (  0,  0   )     int  ->  zero-ref    "field V35.Item1 (fldOffset=0x0)" P-INDEP
 ;* V61 tmp57        [V61    ] (  0,  0   )     int  ->  zero-ref    "field V35.Item2 (fldOffset=0x4)" P-INDEP
 ;* V62 tmp58        [V62    ] (  0,  0   )     int  ->  zero-ref    "field V40.Item1 (fldOffset=0x0)" P-INDEP
 ;  V63 tmp59        [V63,T15] (  2,  8   )     int  ->  rcx         "field V40.Item2 (fldOffset=0x4)" P-INDEP
 ;  V64 tmp60        [V64,T16] (  2,  8   )  ushort  ->  rcx         "field V43.value (fldOffset=0x0)" P-INDEP
 ;  V65 tmp61        [V65,T26] (  2,  4   )    long  ->  rbx         "Cast away GC"
 ;  V66 cse0         [V66,T18] (  4,  7   )     int  ->   r8         "CSE #02: moderate"
 ;  V67 rat0         [V67,T12] (  5, 17   )    long  ->  rsi         "Widened IV V16"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 16
 
 G_M39766_IG01:
        push     rbp
        push     r15
-       push     r14
        push     rbx
-       push     rax
+       sub      rsp, 16
        lea      rbp, [rsp+0x20]
        xor      eax, eax
-       mov      qword ptr [rbp-0x20], rax
+       mov      qword ptr [rbp-0x18], rax
        mov      rbx, rsi
        mov      r15d, edx
-						;; size=24 bbWeight=1 PerfScore 7.25
+						;; size=25 bbWeight=1 PerfScore 5.50
 G_M39766_IG02:
-       mov      r14, gword ptr [rbp+0x10]
-       test     r14, r14
+       mov      rdx, gword ptr [rbp+0x10]
+       test     rdx, rdx
        je       SHORT G_M39766_IG04
 						;; size=9 bbWeight=1 PerfScore 2.25
 G_M39766_IG03:
-       cmp      dword ptr [r14+0x08], r15d
-       jg       G_M39766_IG18
-       lea      rsi, bword ptr [r14+0x0C]
-       mov      edx, dword ptr [r14+0x08]
+       cmp      dword ptr [rdx+0x08], r15d
+       jg       G_M39766_IG19
+       lea      rsi, bword ptr [rdx+0x0C]
+       mov      edx, dword ptr [rdx+0x08]
        add      rdx, rdx
        mov      rdi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Memmove(byref,byref,ulong)
        call     [rax]System.SpanHelpers:Memmove(byref,byref,ulong)
-						;; size=36 bbWeight=0.50 PerfScore 5.12
+						;; size=35 bbWeight=0.50 PerfScore 5.12
 G_M39766_IG04:
-       mov      bword ptr [rbp-0x20], rbx
+       mov      bword ptr [rbp-0x18], rbx
        mov      eax, r15d
        lea      rax, [rbx+2*rax]
        mov      ecx, dword ptr [rbp+0x24]
        test     ecx, ecx
-       jl       G_M39766_IG19
+       jl       G_M39766_IG18
        mov      rdx, qword ptr [rbp+0x18]
        mov      edi, dword ptr [rbp+0x20]
        xor      esi, esi
        lea      r8d, [rcx-0x01]
        test     r8d, r8d
        jle      SHORT G_M39766_IG11
 						;; size=40 bbWeight=1 PerfScore 8.00
 G_M39766_IG05:
        mov      r9d, dword ptr [rdx+4*rsi]
        mov      r10d, 9
        test     r9d, r9d
        jne      SHORT G_M39766_IG08
 						;; size=15 bbWeight=4 PerfScore 14.00
 G_M39766_IG06:
        mov      r11d, r9d
 						;; size=3 bbWeight=2 PerfScore 0.50
 G_M39766_IG07:
        test     r10d, r10d
        mov      r9d, r11d
        jle      SHORT G_M39766_IG10
        align    [0 bytes for IG08]
 						;; size=8 bbWeight=32 PerfScore 48.00
 G_M39766_IG08:
        dec      r10d
        mov      r11d, 0xD1FFAB1E
        mov      ebx, r9d
        imul     r11, rbx
        shr      r11, 35
        lea      ebx, [r11+4*r11]
        add      ebx, ebx
        sub      r9d, ebx
        add      rax, -2
        add      r9d, 48
        movzx    r9, r9w
        mov      word  ptr [rax], r9w
        test     r11d, r11d
        je       SHORT G_M39766_IG07
 						;; size=50 bbWeight=16 PerfScore 116.00
 G_M39766_IG09:
        mov      r9d, r11d
        jmp      SHORT G_M39766_IG08
 						;; size=5 bbWeight=8 PerfScore 18.00
 G_M39766_IG10:
        add      edi, -9
        inc      esi
        cmp      esi, r8d
        jl       SHORT G_M39766_IG05
 						;; size=10 bbWeight=4 PerfScore 7.00
 G_M39766_IG11:
        cmp      r8d, ecx
        jae      SHORT G_M39766_IG20
        mov      ecx, r8d
        mov      ecx, dword ptr [rdx+4*rcx]
        mov      edx, edi
        test     ecx, ecx
        jne      SHORT G_M39766_IG14
 						;; size=17 bbWeight=1 PerfScore 5.00
 G_M39766_IG12:
        mov      edi, ecx
 						;; size=2 bbWeight=0.50 PerfScore 0.12
 G_M39766_IG13:
        test     edx, edx
        mov      ecx, edi
        jle      SHORT G_M39766_IG16
        align    [0 bytes for IG14]
 						;; size=6 bbWeight=8 PerfScore 12.00
 G_M39766_IG14:
        dec      edx
        mov      edi, 0xD1FFAB1E
        mov      esi, ecx
        imul     rdi, rsi
        shr      rdi, 35
        lea      esi, [rdi+4*rdi]
        add      esi, esi
        sub      ecx, esi
        add      rax, -2
        add      ecx, 48
        movzx    rcx, cx
        mov      word  ptr [rax], cx
        test     edi, edi
        je       SHORT G_M39766_IG13
 						;; size=41 bbWeight=4 PerfScore 29.00
 G_M39766_IG15:
        mov      ecx, edi
        jmp      SHORT G_M39766_IG14
 						;; size=4 bbWeight=2 PerfScore 4.50
 G_M39766_IG16:
        xor      eax, eax
-       mov      bword ptr [rbp-0x20], rax
+       mov      bword ptr [rbp-0x18], rax
 						;; size=6 bbWeight=1 PerfScore 1.25
 G_M39766_IG17:
-       add      rsp, 8
+       add      rsp, 16
        pop      rbx
-       pop      r14
        pop      r15
        pop      rbp
        ret      
-						;; size=11 bbWeight=1 PerfScore 3.25
+						;; size=9 bbWeight=1 PerfScore 2.75
 G_M39766_IG18:
-       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
-       call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
+       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
+       call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M39766_IG19:
-       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
-       call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
+       mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
+       call     [rax]System.ThrowHelper:ThrowArgumentException_DestinationTooShort()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
 G_M39766_IG20:
        call     CORINFO_HELP_RNGCHKFAIL
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 319, prolog size 24, PerfScore 281.25, instruction count 106, allocated bytes for code 319 (MethodHash=7fe064a9) for method System.Number+<>c:<FormatBigInteger>b__17_0(System.Span`1[ushort],System.ValueTuple`4[int,long,int,System.String]):this (FullOpts)
+; Total bytes of code 317, prolog size 25, PerfScore 279.00, instruction count 104, allocated bytes for code 317 (MethodHash=7fe064a9) for method System.Number+<>c:<FormatBigInteger>b__17_0(System.Span`1[ushort],System.ValueTuple`4[int,long,int,System.String]):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/37f13b5ce09304832e7de00c80aa3e19

MihuBot · 2025-01-11T18:09:44Z

@xtqqczze

xtqqczze referenced this issue in xtqqczze/dotnet-runtime Jan 11, 2025

Tweak String.CopyTo

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[JitDiff X64] xtqqczze/dotnet-runtime/UIntCastLengthCheck5 #879

[JitDiff X64] xtqqczze/dotnet-runtime/UIntCastLengthCheck5 #879

MihuBot commented Jan 11, 2025 •

edited

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MihuBot commented Jan 11, 2025

MihuBot commented Jan 11, 2025

MihuBot commented Jan 11, 2025

[JitDiff X64] xtqqczze/dotnet-runtime/UIntCastLengthCheck5 #879

[JitDiff X64] xtqqczze/dotnet-runtime/UIntCastLengthCheck5 #879

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MihuBot commented Jan 11, 2025 • edited Loading

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MihuBot commented Jan 11, 2025

Top method regressions

MihuBot commented Jan 11, 2025

Top method improvements

MihuBot commented Jan 11, 2025

MihuBot commented Jan 11, 2025 •

edited

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