[JitDiff X64] [EgorBo] Replace small stackallocs with collection literals

[MihuBot]

Job completed in 3 minutes 36 seconds (remote runner delay: 0 seconds).
dotnet/runtime#128389

Main commit: dotnet/runtime@f397c83
PR commit: EgorBo/runtime-1@1dd78d3

Diffs

Diffs

Found 97 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 46341558
Total bytes of diff: 46340712
Total bytes of delta: -846 (-0.00 % of base)
Total relative delta: -3.68
    diff is an improvement.
    relative diff is an improvement.


Total byte diff includes 159 bytes from reconciling methods
	Base had    0 unique methods,        0 unique bytes
	Diff had   24 unique methods,      159 unique bytes

Top file regressions (bytes):
          53 : System.Private.DataContractSerialization.dasm (0.01 % of base)

Top file improvements (bytes):
        -212 : System.Private.CoreLib.dasm (-0.00 % of base)
        -153 : System.Text.Json.dasm (-0.01 % of base)
        -128 : System.Private.Uri.dasm (-0.13 % of base)
         -71 : System.Reflection.Metadata.dasm (-0.01 % of base)
         -63 : System.IO.Pipelines.dasm (-0.08 % of base)
         -63 : System.IO.Compression.dasm (-0.03 % of base)
         -48 : System.Runtime.Numerics.dasm (-0.03 % of base)
         -43 : System.Security.Cryptography.dasm (-0.00 % of base)
         -35 : System.Linq.Expressions.dasm (-0.00 % of base)
         -29 : System.Data.Common.dasm (-0.00 % of base)
         -27 : System.Formats.Cbor.dasm (-0.06 % of base)
         -20 : System.Diagnostics.DiagnosticSource.dasm (-0.01 % of base)
          -7 : System.Text.RegularExpressions.dasm (-0.00 % of base)

14 total files with Code Size differences (13 improved, 1 regressed), 246 unchanged.

Top method regressions (bytes):
         189 (1.77 % of base) : System.Text.RegularExpressions.dasm - System.Text.RegularExpressions.RegexCompiler:EmitMatchCharacterClass(System.String):this (FullOpts)
          40 (0.58 % of base) : System.Private.CoreLib.dasm - System.Number:NumberToStringFormat[byte](byref,byref,System.ReadOnlySpan`1[char],System.Globalization.NumberFormatInfo) (FullOpts)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[byte,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[byte,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[byte,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[double,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[double,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[double,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[int,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[int,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[int,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[long,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[long,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[long,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[short,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[short,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[short,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Nullable`1[int],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Nullable`1[int],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Nullable`1[int],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Numerics.Vector`1[float],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Numerics.Vector`1[float],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Numerics.Vector`1[float],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           4 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.__Canon,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           4 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.__Canon,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           4 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.__Canon,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)

Top method improvements (bytes):
        -123 (-8.33 % of base) : System.Text.RegularExpressions.dasm - System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ExtractCommonPrefixText|43_3(System.Text.RegularExpressions.RegexNode):System.Text.RegularExpressions.RegexNode (FullOpts)
         -88 (-3.40 % of base) : System.Linq.Expressions.dasm - System.Linq.Expressions.Compiler.ILGen:EmitDecimal(System.Reflection.Emit.ILGenerator,System.Decimal) (FullOpts)
         -73 (-3.91 % of base) : System.Text.RegularExpressions.dasm - System.Text.RegularExpressions.RegexNode:TryGetOrdinalCaseInsensitiveString(int,int,byref,byref,bool,bool):bool:this (FullOpts)
         -68 (-5.69 % of base) : System.Private.Uri.dasm - System.UriHelper:EscapeStringToBuilder(System.ReadOnlySpan`1[char],byref,System.Buffers.SearchValues`1[char],bool) (FullOpts)
         -63 (-54.31 % of base) : System.IO.Compression.dasm - System.IO.Compression.ZstandardStream:ReadByte():int:this (FullOpts)
         -63 (-55.26 % of base) : System.IO.Pipelines.dasm - System.IO.Pipelines.PipeReaderStream:ReadByte():int:this (FullOpts)
         -60 (-4.63 % of base) : System.Private.Uri.dasm - System.IriHelper:EscapeUnescapeIri(byref,System.ReadOnlySpan`1[char],bool) (FullOpts)
         -60 (-9.42 % of base) : System.Text.Json.dasm - System.Text.Json.Utf8JsonWriter:WriteStringSegmentWithLeftover(System.ReadOnlySpan`1[char],bool):this (FullOpts)
         -50 (-8.87 % of base) : System.Text.Json.dasm - System.Text.Json.Utf8JsonWriter:WriteStringSegmentWithLeftover(System.ReadOnlySpan`1[byte],bool):this (FullOpts)
         -48 (-9.80 % of base) : System.Runtime.Numerics.dasm - System.Numerics.BigInteger:.ctor(System.Decimal):this (FullOpts)
         -47 (-4.91 % of base) : System.Private.CoreLib.dasm - System.Reflection.AssemblyName:EscapeStringToBuilder(System.ReadOnlySpan`1[char],byref) (FullOpts)
         -44 (-15.12 % of base) : System.Private.CoreLib.dasm - System.IO.UnmanagedMemoryAccessor:Write(long,System.Decimal):this (FullOpts)
         -43 (-14.10 % of base) : System.Security.Cryptography.dasm - System.Security.Cryptography.X509Certificates.X500DistinguishedNameBuilder:AddCountryOrRegion(System.String):this (FullOpts)
         -43 (-15.99 % of base) : System.Text.Json.dasm - System.Text.Json.Utf8JsonWriter:WriteBase64StringSegmentWithLeftover(System.ReadOnlySpan`1[byte],bool):this (FullOpts)
         -40 (-24.54 % of base) : System.Formats.Cbor.dasm - System.Formats.Cbor.CborWriter+DecimalHelpers:Deconstruct(System.Decimal,byref,byref) (FullOpts)
         -40 (-20.20 % of base) : System.Formats.Cbor.dasm - System.Formats.Cbor.CborWriter+DecimalHelpers:ReconstructFromNegativeScale(System.Decimal,byte):System.Decimal (FullOpts)
         -40 (-31.25 % of base) : System.Reflection.Metadata.dasm - System.Reflection.Internal.DecimalUtilities:GetBits(System.Decimal,byref,byref,byref,byref,byref) (FullOpts)
         -40 (-9.80 % of base) : System.Private.CoreLib.dasm - System.Text.DecoderNLS:DrainLeftoverDataForGetCharCount(System.ReadOnlySpan`1[byte],byref):int:this (FullOpts)
         -37 (-3.24 % of base) : System.Private.CoreLib.dasm - System.Resources.ResourceReader:_LoadObjectV1(int):System.Object:this (FullOpts)
         -32 (-4.23 % of base) : System.Private.CoreLib.dasm - System.Globalization.TextInfo:AddTitlecaseLetter(byref,byref,int,int):int:this (FullOpts)
         -31 (-36.05 % of base) : System.Reflection.Metadata.dasm - System.Reflection.Internal.DecimalUtilities:GetScale(System.Decimal):int (FullOpts)
         -29 (-14.50 % of base) : System.Data.Common.dasm - System.Data.SqlTypes.SqlDecimal:.ctor(System.Decimal):this (FullOpts)
         -25 (-4.19 % of base) : System.Private.CoreLib.dasm - System.Text.DecoderNLS:DrainLeftoverDataForGetChars(System.ReadOnlySpan`1[byte],System.Span`1[char],byref):int:this (FullOpts)
         -23 (-1.21 % of base) : System.Private.CoreLib.dasm - System.Buffers.SearchValues:Create(System.ReadOnlySpan`1[char]):System.Buffers.SearchValues`1[char] (FullOpts)
         -20 (-6.49 % of base) : System.Diagnostics.DiagnosticSource.dasm - System.Diagnostics.ActivityTraceId:.ctor(System.ReadOnlySpan`1[byte]):this (FullOpts)
          -2 (-0.43 % of base) : System.Private.CoreLib.dasm - System.Globalization.TextInfo:ToLower(System.Text.Rune):System.Text.Rune:this (FullOpts)
          -2 (-0.43 % of base) : System.Private.CoreLib.dasm - System.Globalization.TextInfo:ToUpper(System.Text.Rune):System.Text.Rune:this (FullOpts)

Top method regressions (percentages):
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[byte,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[byte,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[byte,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[double,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[double,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[double,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[int,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[int,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[int,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[long,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[long,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[long,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[short,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[short,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[short,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           4 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.__Canon,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           4 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.__Canon,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           4 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.__Canon,System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Nullable`1[int],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Nullable`1[int],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Nullable`1[int],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Formats.Cbor.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Numerics.Vector`1[float],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Private.DataContractSerialization.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Numerics.Vector`1[float],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
           7 (Infinity of base) : System.Linq.Expressions.dasm - <PrivateImplementationDetails>:InlineArrayAsSpan[System.Numerics.Vector`1[float],System.Nullable`1[int]](byref,int):System.Span`1[System.Nullable`1[int]] (FullOpts) (0 base, 1 diff methods)
         189 (1.77 % of base) : System.Text.RegularExpressions.dasm - System.Text.RegularExpressions.RegexCompiler:EmitMatchCharacterClass(System.String):this (FullOpts)
          40 (0.58 % of base) : System.Private.CoreLib.dasm - System.Number:NumberToStringFormat[byte](byref,byref,System.ReadOnlySpan`1[char],System.Globalization.NumberFormatInfo) (FullOpts)

Top method improvements (percentages):
         -63 (-55.26 % of base) : System.IO.Pipelines.dasm - System.IO.Pipelines.PipeReaderStream:ReadByte():int:this (FullOpts)
         -63 (-54.31 % of base) : System.IO.Compression.dasm - System.IO.Compression.ZstandardStream:ReadByte():int:this (FullOpts)
         -31 (-36.05 % of base) : System.Reflection.Metadata.dasm - System.Reflection.Internal.DecimalUtilities:GetScale(System.Decimal):int (FullOpts)
         -40 (-31.25 % of base) : System.Reflection.Metadata.dasm - System.Reflection.Internal.DecimalUtilities:GetBits(System.Decimal,byref,byref,byref,byref,byref) (FullOpts)
         -40 (-24.54 % of base) : System.Formats.Cbor.dasm - System.Formats.Cbor.CborWriter+DecimalHelpers:Deconstruct(System.Decimal,byref,byref) (FullOpts)
         -40 (-20.20 % of base) : System.Formats.Cbor.dasm - System.Formats.Cbor.CborWriter+DecimalHelpers:ReconstructFromNegativeScale(System.Decimal,byte):System.Decimal (FullOpts)
         -43 (-15.99 % of base) : System.Text.Json.dasm - System.Text.Json.Utf8JsonWriter:WriteBase64StringSegmentWithLeftover(System.ReadOnlySpan`1[byte],bool):this (FullOpts)
         -44 (-15.12 % of base) : System.Private.CoreLib.dasm - System.IO.UnmanagedMemoryAccessor:Write(long,System.Decimal):this (FullOpts)
         -29 (-14.50 % of base) : System.Data.Common.dasm - System.Data.SqlTypes.SqlDecimal:.ctor(System.Decimal):this (FullOpts)
         -43 (-14.10 % of base) : System.Security.Cryptography.dasm - System.Security.Cryptography.X509Certificates.X500DistinguishedNameBuilder:AddCountryOrRegion(System.String):this (FullOpts)
         -40 (-9.80 % of base) : System.Private.CoreLib.dasm - System.Text.DecoderNLS:DrainLeftoverDataForGetCharCount(System.ReadOnlySpan`1[byte],byref):int:this (FullOpts)
         -48 (-9.80 % of base) : System.Runtime.Numerics.dasm - System.Numerics.BigInteger:.ctor(System.Decimal):this (FullOpts)
         -60 (-9.42 % of base) : System.Text.Json.dasm - System.Text.Json.Utf8JsonWriter:WriteStringSegmentWithLeftover(System.ReadOnlySpan`1[char],bool):this (FullOpts)
         -50 (-8.87 % of base) : System.Text.Json.dasm - System.Text.Json.Utf8JsonWriter:WriteStringSegmentWithLeftover(System.ReadOnlySpan`1[byte],bool):this (FullOpts)
        -123 (-8.33 % of base) : System.Text.RegularExpressions.dasm - System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ExtractCommonPrefixText|43_3(System.Text.RegularExpressions.RegexNode):System.Text.RegularExpressions.RegexNode (FullOpts)
         -20 (-6.49 % of base) : System.Diagnostics.DiagnosticSource.dasm - System.Diagnostics.ActivityTraceId:.ctor(System.ReadOnlySpan`1[byte]):this (FullOpts)
         -68 (-5.69 % of base) : System.Private.Uri.dasm - System.UriHelper:EscapeStringToBuilder(System.ReadOnlySpan`1[char],byref,System.Buffers.SearchValues`1[char],bool) (FullOpts)
         -47 (-4.91 % of base) : System.Private.CoreLib.dasm - System.Reflection.AssemblyName:EscapeStringToBuilder(System.ReadOnlySpan`1[char],byref) (FullOpts)
         -60 (-4.63 % of base) : System.Private.Uri.dasm - System.IriHelper:EscapeUnescapeIri(byref,System.ReadOnlySpan`1[char],bool) (FullOpts)
         -32 (-4.23 % of base) : System.Private.CoreLib.dasm - System.Globalization.TextInfo:AddTitlecaseLetter(byref,byref,int,int):int:this (FullOpts)
         -25 (-4.19 % of base) : System.Private.CoreLib.dasm - System.Text.DecoderNLS:DrainLeftoverDataForGetChars(System.ReadOnlySpan`1[byte],System.Span`1[char],byref):int:this (FullOpts)
         -73 (-3.91 % of base) : System.Text.RegularExpressions.dasm - System.Text.RegularExpressions.RegexNode:TryGetOrdinalCaseInsensitiveString(int,int,byref,byref,bool,bool):bool:this (FullOpts)
         -88 (-3.40 % of base) : System.Linq.Expressions.dasm - System.Linq.Expressions.Compiler.ILGen:EmitDecimal(System.Reflection.Emit.ILGenerator,System.Decimal) (FullOpts)
         -37 (-3.24 % of base) : System.Private.CoreLib.dasm - System.Resources.ResourceReader:_LoadObjectV1(int):System.Object:this (FullOpts)
         -23 (-1.21 % of base) : System.Private.CoreLib.dasm - System.Buffers.SearchValues:Create(System.ReadOnlySpan`1[char]):System.Buffers.SearchValues`1[char] (FullOpts)
          -2 (-0.43 % of base) : System.Private.CoreLib.dasm - System.Globalization.TextInfo:ToLower(System.Text.Rune):System.Text.Rune:this (FullOpts)
          -2 (-0.43 % of base) : System.Private.CoreLib.dasm - System.Globalization.TextInfo:ToUpper(System.Text.Rune):System.Text.Rune:this (FullOpts)

53 total methods with Code Size differences (27 improved, 26 regressed), 287393 unchanged.

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

Artifacts:

• diff-frameworks.txt (22 KB)
• ShortDiffsRegressions.md (107 B)
• LongDiffsRegressions.md (435 KB)
• ShortDiffsImprovements.md (56 KB)
• LongDiffsImprovements.md (675 KB)
• jit-diffs-main.zip (158 MB)
• jit-diffs-pr.zip (158 MB)

[MihuBot]

Top method regressions

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

Larger list of diffs: https://gist.github.com/MihuBot/a7bb95da4e586237a14e48267e1cba0f

[MihuBot]

Top method improvements

-123 (-8.33 % of base) - System.Text.RegularExpressions.RegexNode:g__ExtractCommonPrefixText|43_3(System.Text.RegularExpressions.RegexNode):System.Text.RegularExpressions.RegexNode

 ; Assembly listing for method System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ExtractCommonPrefixText|43_3(System.Text.RegularExpressions.RegexNode):System.Text.RegularExpressions.RegexNode (FullOpts)
 ; Emitting BLENDED_CODE for x64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; fully interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 35 single block inlinees; 14 inlinees without PGO data
+; 0 inlinees with PGO data; 36 single block inlinees; 13 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T35] ( 12, 15.50)     ref  ->  rbx         class-hnd single-def <System.Text.RegularExpressions.RegexNode>
 ;  V01 loc0         [V01,T09] (  8, 75   )     ref  ->  r15         class-hnd single-def <System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]>
 ;* V02 loc1         [V02    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[char]>
-;* V03 loc2         [V03,T71] (  0,  0   )     int  ->  zero-ref   
-;  V04 loc3         [V04,T03] ( 13,160   )     ref  ->  rax         class-hnd <System.Text.RegularExpressions.RegexNode>
-;  V05 loc4         [V05,T22] (  7, 28   )     int  ->  r12        
-;  V06 loc5         [V06    ] ( 24,272   )  struct (16) [rbp-0x48]  do-not-enreg[XSA] multireg-arg must-init addr-exposed ld-addr-op <System.ReadOnlySpan`1[char]>
-;  V07 loc6         [V07,T23] (  7, 28   )     int  ->  [rbp-0x4C]  ptr
-;  V08 loc7         [V08,T59] (  2,  4   )     ref  ->  [rbp-0x70]  class-hnd spill-single-def ptr <System.Text.RegularExpressions.RegexNode>
-;  V09 loc8         [V09,T25] (  5, 24   )     ref  ->  [rbp-0x78]  class-hnd ptr <System.Text.RegularExpressions.RegexNode>
-;  V10 loc9         [V10,T52] (  3,  6   )     ref  ->  rdi         class-hnd exact <System.Text.RegularExpressions.RegexNode>
-;* V11 loc10        [V11    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact ptr <System.Text.RegularExpressions.RegexNode>
-;  V12 loc11        [V12,T08] (  3, 80   )     int  ->  rdi        
-;  V13 loc12        [V13,T00] ( 10,416   )     int  ->  rcx        
-;  V14 loc13        [V14,T60] (  2,  4   )     int  ->  rsi        
-;  V15 loc14        [V15,T10] (  5, 64   )     ref  ->  [rbp-0x80]  class-hnd spill-single-def ptr <System.Text.RegularExpressions.RegexNode>
-;# V16 OutArgs      [V16    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V17 tmp1         [V17    ] (  1,  0.50)  struct ( 8) [rbp-0x38]  do-not-enreg[XS] addr-exposed ld-addr-op unsafe-buffer "stackallocLocal" <UNNAMED>
-;* V18 tmp2         [V18    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[char]>
-;  V19 tmp3         [V19,T16] (  3, 48   )     int  ->  rdi         "impAppendStmt"
-;* V20 tmp4         [V20    ] (  0,  0   )     int  ->  zero-ref    "impAppendStmt"
-;* V21 tmp5         [V21    ] (  0,  0   )     int  ->  zero-ref    "impAppendStmt"
-;  V22 tmp6         [V22,T29] (  5, 20   )     ref  ->  rax         class-hnd exact "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
-;  V23 tmp7         [V23,T53] (  3,  6   )     ref  ->  rax        
-;  V24 tmp8         [V24,T36] (  4, 16   )     ref  ->  rax         class-hnd exact "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
-;  V25 tmp9         [V25,T20] (  3, 32   )     ref  ->  rdi        
-;  V26 tmp10        [V26,T21] (  7, 28   )     ref  ->  [rbp-0x88]  class-hnd exact spill-single-def ptr "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
-;  V27 tmp11        [V27,T30] (  5, 20   )     ref  ->  [rbp-0x90]  class-hnd exact spill-single-def ptr "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
-;  V28 tmp12        [V28,T31] (  5, 20   )     ref  ->  [rbp-0x98]  class-hnd exact spill-single-def ptr "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
-;* V29 tmp13        [V29    ] (  0,  0   )   byref  ->  zero-ref    "impAppendStmt"
-;* V30 tmp14        [V30    ] (  0,  0   )  struct (16) zero-ref    "Inline return value spill temp" <System.ReadOnlySpan`1[char]>
-;  V31 tmp15        [V31,T37] (  4, 16   )     ref  ->  rdi         class-hnd exact "Inlining Arg" <System.String>
-;* V32 tmp16        [V32    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
-;* V33 tmp17        [V33    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inline ldloca(s) first use temp" <System.ReadOnlySpan`1[char]>
-;  V34 tmp18        [V34,T46] (  2,  8   )   byref  ->  rcx         "Inlining Arg"
-;  V35 tmp19        [V35,T48] (  2,  8   )     int  ->  rdi         "Inlining Arg"
-;* V36 tmp20        [V36    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[char]>
-;* V37 tmp21        [V37    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
-;* V38 tmp22        [V38    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;* V39 tmp23        [V39    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
-;* V40 tmp24        [V40    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
-;* V41 tmp25        [V41    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V42 tmp26        [V42,T28] (  3, 24   )     int  ->  rdi         "Inline return value spill temp"
-;  V43 tmp27        [V43,T17] (  3, 48   )     int  ->  rcx         "Inlining Arg"
-;* V44 tmp28        [V44    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
-;* V45 tmp29        [V45    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
-;  V46 tmp30        [V46,T47] (  2,  8   )     ref  ->  rax         class-hnd exact "Inlining Arg" <System.String>
-;  V47 tmp31        [V47,T49] (  2,  8   )  ushort  ->  rdi         "Inlining Arg"
-;  V48 tmp32        [V48,T26] (  3, 24   )     ref  ->  rdi         class-hnd exact "Inline return value spill temp" <System.Text.RegularExpressions.RegexNode>
-;  V49 tmp33        [V49,T13] (  4, 56   )     ref  ->  rdi         "ISINST eval op1"
-;* V50 tmp34        [V50    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling qmarkNull" <System.Text.RegularExpressions.RegexNode>
-;  V51 tmp35        [V51,T39] (  2, 16   )     ref  ->  rdi         class-hnd exact "Inline stloc first use temp" <System.Text.RegularExpressions.RegexNode>
-;  V52 tmp36        [V52,T14] (  3, 48   )     ref  ->  r10         class-hnd "Inlining Arg" <System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]>
-;  V53 tmp37        [V53,T38] (  4, 16   )     ref  ->  r12         class-hnd "Inlining Arg" <System.Text.RegularExpressions.RegexNode>
-;  V54 tmp38        [V54,T45] (  3, 10   )     ref  ->  rdi         "ISINST eval op1"
-;* V55 tmp39        [V55    ] (  0,  0   )     int  ->  zero-ref    "spilling qmarkNull"
-;  V56 tmp40        [V56,T32] (  5, 20   )     ref  ->  [rbp-0xA0]  class-hnd spill-single-def ptr "Inlining Arg" <System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]>
-;  V57 tmp41        [V57,T67] (  3,  1.50)     ref  ->  rax         class-hnd exact "Inline return value spill temp" <System.Text.RegularExpressions.RegexNode>
-;  V58 tmp42        [V58,T62] (  4,  3.50)     ref  ->  rax         single-def "ISINST eval op1"
-;* V59 tmp43        [V59    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling qmarkNull" <System.Text.RegularExpressions.RegexNode>
-;  V60 tmp44        [V60,T69] (  2,  1   )     ref  ->  rax         class-hnd exact "Inline stloc first use temp" <System.Text.RegularExpressions.RegexNode>
-;  V61 tmp45        [V61,T63] (  3,  3   )     ref  ->  rbx         class-hnd single-def "Inlining Arg" <System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]>
-;  V62 tmp46        [V62,T57] (  3,  4.50)   byref  ->  r14         single-def "field V02._reference (fldOffset=0x0)" P-INDEP
-;* V63 tmp47        [V63,T72] (  0,  0   )     int  ->  zero-ref    "field V02._length (fldOffset=0x8)" P-INDEP
-;  V64 tmp48        [V64    ] ( 12,144   )   byref  ->  [rbp-0x48]  do-not-enreg[X] addr-exposed ptr "field V06._reference (fldOffset=0x0)" P-DEP
-;  V65 tmp49        [V65    ] ( 15,162   )     int  ->  [rbp-0x40]  do-not-enreg[X] addr-exposed ptr "field V06._length (fldOffset=0x8)" P-DEP
-;  V66 tmp50        [V66,T70] (  2,  1   )   byref  ->  r14         single-def "field V18._reference (fldOffset=0x0)" P-INDEP
-;* V67 tmp51        [V67    ] (  0,  0   )     int  ->  zero-ref    "field V18._length (fldOffset=0x8)" P-INDEP
-;  V68 tmp52        [V68,T54] (  3,  6   )   byref  ->  rcx         "field V30._reference (fldOffset=0x0)" P-INDEP
-;  V69 tmp53        [V69,T55] (  3,  6   )     int  ->  rdi         "field V30._length (fldOffset=0x8)" P-INDEP
-;* V70 tmp54        [V70    ] (  0,  0   )   byref  ->  zero-ref    "field V32._reference (fldOffset=0x0)" P-INDEP
-;* V71 tmp55        [V71    ] (  0,  0   )     int  ->  zero-ref    "field V32._length (fldOffset=0x8)" P-INDEP
-;* V72 tmp56        [V72    ] (  0,  0   )   byref  ->  zero-ref    "field V33._reference (fldOffset=0x0)" P-INDEP
-;* V73 tmp57        [V73    ] (  0,  0   )     int  ->  zero-ref    "field V33._length (fldOffset=0x8)" P-INDEP
-;* V74 tmp58        [V74    ] (  0,  0   )   byref  ->  zero-ref    "field V36._reference (fldOffset=0x0)" P-INDEP
-;* V75 tmp59        [V75    ] (  0,  0   )     int  ->  zero-ref    "field V36._length (fldOffset=0x8)" P-INDEP
-;* V76 tmp60        [V76    ] (  0,  0   )   byref  ->  zero-ref    "field V37._reference (fldOffset=0x0)" P-INDEP
-;* V77 tmp61        [V77    ] (  0,  0   )     int  ->  zero-ref    "field V37._length (fldOffset=0x8)" P-INDEP
-;  V78 tmp62        [V78,T40] (  2, 16   )   byref  ->  rdi         "field V40._reference (fldOffset=0x0)" P-INDEP
-;* V79 tmp63        [V79    ] (  0,  0   )     int  ->  zero-ref    "field V40._length (fldOffset=0x8)" P-INDEP
-;  V80 tmp64        [V80,T41] (  2, 16   )   byref  ->  rax         "field V44._reference (fldOffset=0x0)" P-INDEP
-;* V81 tmp65        [V81    ] (  0,  0   )     int  ->  zero-ref    "field V44._length (fldOffset=0x8)" P-INDEP
-;  V82 tmp66        [V82,T27] (  3, 24   )     ref  ->  rdi         "arr expr"
-;  V83 tmp67        [V83,T06] (  3, 96   )     ref  ->  rdi         "arr expr"
-;  V84 tmp68        [V84,T01] (  3,384   )     ref  ->   r8         "arr expr"
-;  V85 tmp69        [V85,T07] (  3, 96   )     ref  ->  rsi         "arr expr"
-;  V86 tmp70        [V86,T15] (  3, 48   )     ref  ->  rsi         "arr expr"
-;  V87 tmp71        [V87,T11] (  2, 64   )     ref  ->  rsi         "argument with side effect"
-;  V88 tmp72        [V88,T43] (  3, 12   )     ref  ->  rdi         "arr expr"
-;  V89 tmp73        [V89,T64] (  3,  3   )     ref  ->  rax         single-def "arr expr"
+;  V03 loc2         [V03    ] (  3,  4.50)  ushort  ->  [rbp-0x2C]  do-not-enreg[X] addr-exposed ld-addr-op
+;* V04 loc3         [V04,T71] (  0,  0   )     int  ->  zero-ref   
+;  V05 loc4         [V05,T03] ( 13,160   )     ref  ->  rax         class-hnd <System.Text.RegularExpressions.RegexNode>
+;  V06 loc5         [V06,T22] (  7, 28   )     int  ->  r13        
+;  V07 loc6         [V07    ] ( 24,272   )  struct (16) [rbp-0x40]  do-not-enreg[XSA] multireg-arg must-init addr-exposed ld-addr-op <System.ReadOnlySpan`1[char]>
+;  V08 loc7         [V08,T23] (  7, 28   )     int  ->  r12        
+;  V09 loc8         [V09,T58] (  2,  4   )     ref  ->  [rbp-0x58]  class-hnd spill-single-def <System.Text.RegularExpressions.RegexNode>
+;  V10 loc9         [V10,T25] (  5, 24   )     ref  ->  [rbp-0x60]  class-hnd <System.Text.RegularExpressions.RegexNode>
+;  V11 loc10        [V11,T52] (  3,  6   )     ref  ->  rdi         class-hnd exact <System.Text.RegularExpressions.RegexNode>
+;* V12 loc11        [V12    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact <System.Text.RegularExpressions.RegexNode>
+;  V13 loc12        [V13,T08] (  3, 80   )     int  ->  rdi        
+;  V14 loc13        [V14,T00] ( 10,416   )     int  ->  rcx        
+;  V15 loc14        [V15,T59] (  2,  4   )     int  ->  rsi        
+;  V16 loc15        [V16,T10] (  5, 64   )     ref  ->  [rbp-0x68]  class-hnd spill-single-def <System.Text.RegularExpressions.RegexNode>
+;# V17 OutArgs      [V17    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
+;* V18 tmp1         [V18    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.Span`1[char]>
+;  V19 tmp2         [V19,T16] (  3, 48   )     int  ->  rdi         "impAppendStmt"
+;* V20 tmp3         [V20    ] (  0,  0   )     int  ->  zero-ref    "impAppendStmt"
+;* V21 tmp4         [V21    ] (  0,  0   )     int  ->  zero-ref    "impAppendStmt"
+;  V22 tmp5         [V22,T29] (  5, 20   )     ref  ->  rax         class-hnd exact "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
+;  V23 tmp6         [V23,T53] (  3,  6   )     ref  ->  rax        
+;  V24 tmp7         [V24,T36] (  4, 16   )     ref  ->  rax         class-hnd exact "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
+;  V25 tmp8         [V25,T20] (  3, 32   )     ref  ->  rdi        
+;  V26 tmp9         [V26,T21] (  7, 28   )     ref  ->  [rbp-0x70]  class-hnd exact spill-single-def "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
+;  V27 tmp10        [V27,T30] (  5, 20   )     ref  ->  [rbp-0x78]  class-hnd exact spill-single-def "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
+;  V28 tmp11        [V28,T31] (  5, 20   )     ref  ->  [rbp-0x80]  class-hnd exact spill-single-def "NewObj constructor temp" <System.Text.RegularExpressions.RegexNode>
+;* V29 tmp12        [V29    ] (  0,  0   )   byref  ->  zero-ref    "impAppendStmt"
+;* V30 tmp13        [V30    ] (  0,  0   )  struct (16) zero-ref    "Inline return value spill temp" <System.ReadOnlySpan`1[char]>
+;  V31 tmp14        [V31,T37] (  4, 16   )     ref  ->  rdi         class-hnd exact "Inlining Arg" <System.String>
+;* V32 tmp15        [V32    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
+;* V33 tmp16        [V33    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inline ldloca(s) first use temp" <System.ReadOnlySpan`1[char]>
+;  V34 tmp17        [V34,T46] (  2,  8   )   byref  ->  rcx         "Inlining Arg"
+;  V35 tmp18        [V35,T48] (  2,  8   )     int  ->  rdi         "Inlining Arg"
+;* V36 tmp19        [V36    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "Inlining Arg" <System.Span`1[char]>
+;* V37 tmp20        [V37    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
+;* V38 tmp21        [V38    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;* V39 tmp22        [V39    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
+;* V40 tmp23        [V40    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
+;* V41 tmp24        [V41    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;  V42 tmp25        [V42,T28] (  3, 24   )     int  ->  rdi         "Inline return value spill temp"
+;  V43 tmp26        [V43,T17] (  3, 48   )     int  ->  rcx         "Inlining Arg"
+;* V44 tmp27        [V44    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op "NewObj constructor temp" <System.ReadOnlySpan`1[char]>
+;* V45 tmp28        [V45    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
+;  V46 tmp29        [V46,T47] (  2,  8   )     ref  ->  rax         class-hnd exact "Inlining Arg" <System.String>
+;  V47 tmp30        [V47,T49] (  2,  8   )  ushort  ->  rdi         "Inlining Arg"
+;  V48 tmp31        [V48,T26] (  3, 24   )     ref  ->  rdi         class-hnd exact "Inline return value spill temp" <System.Text.RegularExpressions.RegexNode>
+;  V49 tmp32        [V49,T13] (  4, 56   )     ref  ->  rdi         "ISINST eval op1"
+;* V50 tmp33        [V50    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling qmarkNull" <System.Text.RegularExpressions.RegexNode>
+;  V51 tmp34        [V51,T39] (  2, 16   )     ref  ->  rdi         class-hnd exact "Inline stloc first use temp" <System.Text.RegularExpressions.RegexNode>
+;  V52 tmp35        [V52,T14] (  3, 48   )     ref  ->   r9         class-hnd "Inlining Arg" <System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]>
+;  V53 tmp36        [V53,T38] (  4, 16   )     ref  ->  r13         class-hnd "Inlining Arg" <System.Text.RegularExpressions.RegexNode>
+;  V54 tmp37        [V54,T45] (  3, 10   )     ref  ->  rdi         "ISINST eval op1"
+;* V55 tmp38        [V55    ] (  0,  0   )     int  ->  zero-ref    "spilling qmarkNull"
+;  V56 tmp39        [V56,T32] (  5, 20   )     ref  ->  [rbp-0x88]  class-hnd spill-single-def "Inlining Arg" <System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]>
+;  V57 tmp40        [V57,T66] (  3,  1.50)     ref  ->  rax         class-hnd exact "Inline return value spill temp" <System.Text.RegularExpressions.RegexNode>
+;  V58 tmp41        [V58,T61] (  4,  3.50)     ref  ->  rax         single-def "ISINST eval op1"
+;* V59 tmp42        [V59    ] (  0,  0   )     ref  ->  zero-ref    class-hnd "spilling qmarkNull" <System.Text.RegularExpressions.RegexNode>
+;  V60 tmp43        [V60,T68] (  2,  1   )     ref  ->  rax         class-hnd exact "Inline stloc first use temp" <System.Text.RegularExpressions.RegexNode>
+;  V61 tmp44        [V61,T62] (  3,  3   )     ref  ->  rbx         class-hnd single-def "Inlining Arg" <System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]>
+;* V62 tmp45        [V62,T69] (  0,  0   )   byref  ->  zero-ref    single-def "field V02._reference (fldOffset=0x0)" P-INDEP
+;* V63 tmp46        [V63,T72] (  0,  0   )     int  ->  zero-ref    "field V02._length (fldOffset=0x8)" P-INDEP
+;  V64 tmp47        [V64    ] ( 12,144   )   byref  ->  [rbp-0x40]  do-not-enreg[X] addr-exposed "field V07._reference (fldOffset=0x0)" P-DEP
+;  V65 tmp48        [V65    ] ( 15,162   )     int  ->  [rbp-0x38]  do-not-enreg[X] addr-exposed "field V07._length (fldOffset=0x8)" P-DEP
+;* V66 tmp49        [V66,T70] (  0,  0   )   byref  ->  zero-ref    single-def "field V18._reference (fldOffset=0x0)" P-INDEP
+;* V67 tmp50        [V67    ] (  0,  0   )     int  ->  zero-ref    "field V18._length (fldOffset=0x8)" P-INDEP
+;  V68 tmp51        [V68,T54] (  3,  6   )   byref  ->  rcx         "field V30._reference (fldOffset=0x0)" P-INDEP
+;  V69 tmp52        [V69,T55] (  3,  6   )     int  ->  rdi         "field V30._length (fldOffset=0x8)" P-INDEP
+;* V70 tmp53        [V70    ] (  0,  0   )   byref  ->  zero-ref    "field V32._reference (fldOffset=0x0)" P-INDEP
+;* V71 tmp54        [V71    ] (  0,  0   )     int  ->  zero-ref    "field V32._length (fldOffset=0x8)" P-INDEP
+;* V72 tmp55        [V72    ] (  0,  0   )   byref  ->  zero-ref    "field V33._reference (fldOffset=0x0)" P-INDEP
+;* V73 tmp56        [V73    ] (  0,  0   )     int  ->  zero-ref    "field V33._length (fldOffset=0x8)" P-INDEP
+;* V74 tmp57        [V74    ] (  0,  0   )   byref  ->  zero-ref    "field V36._reference (fldOffset=0x0)" P-INDEP
+;* V75 tmp58        [V75    ] (  0,  0   )     int  ->  zero-ref    "field V36._length (fldOffset=0x8)" P-INDEP
+;* V76 tmp59        [V76    ] (  0,  0   )   byref  ->  zero-ref    "field V37._reference (fldOffset=0x0)" P-INDEP
+;* V77 tmp60        [V77    ] (  0,  0   )     int  ->  zero-ref    "field V37._length (fldOffset=0x8)" P-INDEP
+;  V78 tmp61        [V78,T40] (  2, 16   )   byref  ->  rdi         "field V40._reference (fldOffset=0x0)" P-INDEP
+;* V79 tmp62        [V79    ] (  0,  0   )     int  ->  zero-ref    "field V40._length (fldOffset=0x8)" P-INDEP
+;  V80 tmp63        [V80,T41] (  2, 16   )   byref  ->  rax         "field V44._reference (fldOffset=0x0)" P-INDEP
+;* V81 tmp64        [V81    ] (  0,  0   )     int  ->  zero-ref    "field V44._length (fldOffset=0x8)" P-INDEP
+;  V82 tmp65        [V82,T27] (  3, 24   )     ref  ->  rdi         "arr expr"
+;  V83 tmp66        [V83,T06] (  3, 96   )     ref  ->  rdi         "arr expr"
+;  V84 tmp67        [V84,T01] (  3,384   )     ref  ->   r8         "arr expr"
+;  V85 tmp68        [V85,T07] (  3, 96   )     ref  ->  rsi         "arr expr"
+;  V86 tmp69        [V86,T15] (  3, 48   )     ref  ->  rsi         "arr expr"
+;  V87 tmp70        [V87,T11] (  2, 64   )     ref  ->  rsi         "argument with side effect"
+;  V88 tmp71        [V88,T43] (  3, 12   )     ref  ->  rdi         "arr expr"
+;  V89 tmp72        [V89,T63] (  3,  3   )     ref  ->  rax         single-def "arr expr"
 ;  V90 cse0         [V90,T18] (  3, 48   )     int  ->  rdi         "CSE #03: moderate"
 ;  V91 cse1         [V91,T24] (  4, 26   )     ref  ->  rsi         "CSE #05: moderate"
 ;  V92 cse2         [V92,T44] (  3, 12   )     int  ->  rdi         "CSE #10: conservative"
 ;  V93 cse3         [V93,T51] (  4,  6.50)     ref  ->  rsi         "CSE #06: conservative"
-;  V94 cse4         [V94,T66] (  4,  1.62)     ref  ->  rsi         "CSE #11: conservative"
-;  V95 cse5         [V95,T34] ( 11, 19.50)    long  ->  [rbp-0x58]  multi-def "CSE #04: moderate"
+;  V94 cse4         [V94,T65] (  4,  1.62)     ref  ->  rsi         "CSE #11: conservative"
+;  V95 cse5         [V95,T34] ( 11, 19.50)    long  ->  [rbp-0x48]  multi-def "CSE #04: moderate"
 ;  V96 cse6         [V96,T02] (  3,192   )    long  ->  rsi         "CSE #02: aggressive"
-;  V97 rat0         [V97,T19] ( 16, 42.50)    long  ->  r13         "Widened IV V03"
-;  V98 rat1         [V98,T04] (  8,100   )    long  ->  [rbp-0x60]  ptr "Widened IV V07"
-;  V99 rat2         [V99,T05] (  7, 98   )    long  ->  [rbp-0x68]  ptr "Widened IV V14"
-;  V100 rat3        [V100,T58] (  3,  4.50)     ref  ->  rsi         "Spilling to split statement for tree"
+;  V97 rat0         [V97,T19] ( 16, 42.50)    long  ->  r14         "Widened IV V04"
+;  V98 rat1         [V98,T04] (  8,100   )    long  ->  r12         "Widened IV V08"
+;  V99 rat2         [V99,T05] (  7, 98   )    long  ->  [rbp-0x50]  "Widened IV V15"
+;  V100 rat3        [V100,T57] (  3,  4.50)     ref  ->  rsi         "Spilling to split statement for tree"
 ;  V101 rat4        [V101,T50] (  5,  7.50)     ref  ->  r15         "replacement local"
-;  V102 rat5        [V102,T65] (  3,  2.50)    long  ->  rdi         "CSE for expectedClsNode"
-;  V103 rat6        [V103,T12] (  5, 60   )     ref  ->  r10         "replacement local"
+;  V102 rat5        [V102,T64] (  3,  2.50)    long  ->  rdi         "CSE for expectedClsNode"
+;  V103 rat6        [V103,T12] (  5, 60   )     ref  ->   r9         "replacement local"
 ;  V104 rat7        [V104,T33] (  3, 20   )    long  ->  rdi         "CSE for expectedClsNode"
 ;  V105 rat8        [V105,T42] (  5, 15   )     ref  ->  rax         "replacement local"
 ;  V106 rat9        [V106,T56] (  3,  5   )    long  ->  rdi         "CSE for expectedClsNode"
-;  V107 rat10       [V107,T61] (  5,  3.75)     ref  ->  rbx         "replacement local"
-;  V108 rat11       [V108,T68] (  3,  1.25)    long  ->  rdi         "CSE for expectedClsNode"
-;  V109 rat12       [V109    ] (  1,  1   )    long  ->  [rbp-0x30]  do-not-enreg[X] addr-exposed "GSSecurityCookie"
+;  V107 rat10       [V107,T60] (  5,  3.75)     ref  ->  rbx         "replacement local"
+;  V108 rat11       [V108,T67] (  3,  1.25)    long  ->  rdi         "CSE for expectedClsNode"
 ;
-; Lcl frame size = 120
+; Lcl frame size = 104
 
 G_M37593_IG01:
        push     rbp
        push     r15
        push     r14
        push     r13
        push     r12
        push     rbx
-       sub      rsp, 120
-       lea      rbp, [rsp+0xA0]
+       sub      rsp, 104
+       lea      rbp, [rsp+0x90]
        xor      eax, eax
-       mov      qword ptr [rbp-0x48], rax
-       mov      rax, 0xD1FFAB1E
-       mov      qword ptr [rbp-0x30], rax
+       mov      qword ptr [rbp-0x40], rax
        mov      rbx, rdi
-						;; size=45 bbWeight=1 PerfScore 9.50
+						;; size=31 bbWeight=1 PerfScore 8.25
 G_M37593_IG02:
        mov      rsi, gword ptr [rbx+0x08]
        mov      r15, rsi
        test     r15, r15
        je       SHORT G_M37593_IG05
 						;; size=12 bbWeight=1 PerfScore 3.50
 G_M37593_IG03:
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]
        cmp      qword ptr [r15], rdi
        je       SHORT G_M37593_IG05
 						;; size=15 bbWeight=0.50 PerfScore 1.62
 G_M37593_IG04:
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTCLASS_SPECIAL
        call     [rax]CORINFO_HELP_CHKCASTCLASS_SPECIAL
        mov      r15, rax
 						;; size=15 bbWeight=0.25 PerfScore 0.88
 G_M37593_IG05:
        test     byte  ptr [rbx+0x28], 64
-       jne      G_M37593_IG56
+       jne      G_M37593_IG54
 						;; size=10 bbWeight=1 PerfScore 3.00
 G_M37593_IG06:
-       lea      r14, [rbp-0x38]
-       xor      r13d, r13d
-       jmp      G_M37593_IG45
-       align    [4 bytes for IG15]
-						;; size=16 bbWeight=0.50 PerfScore 1.38
+       xor      edi, edi
+       mov      dword ptr [rbp-0x2C], edi
+						;; size=5 bbWeight=0.50 PerfScore 0.62
 G_M37593_IG07:
-       cmp      r13d, edi
-       jae      G_M37593_IG60
+       xor      r14d, r14d
+       jmp      G_M37593_IG45
+       align    [0 bytes for IG16]
+						;; size=8 bbWeight=0.50 PerfScore 1.12
+G_M37593_IG08:
+       cmp      r14d, edi
+       jae      G_M37593_IG57
        mov      rdi, gword ptr [r15+0x08]
-       cmp      r13d, dword ptr [rdi+0x08]
-       jae      G_M37593_IG61
-       mov      rdi, gword ptr [rdi+8*r13+0x10]
+       cmp      r14d, dword ptr [rdi+0x08]
+       jae      G_M37593_IG58
+       mov      rdi, gword ptr [rdi+8*r14+0x10]
        mov      rax, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:FindBranchOneOrMultiStart():System.Text.RegularExpressions.RegexNode:this
        cmp      dword ptr [rdi], edi
        call     [rax]System.Text.RegularExpressions.RegexNode:FindBranchOneOrMultiStart():System.Text.RegularExpressions.RegexNode:this
        test     rax, rax
        je       G_M37593_IG44
 						;; size=51 bbWeight=4 PerfScore 59.00
-G_M37593_IG08:
-       mov      r12d, dword ptr [rax+0x28]
+G_M37593_IG09:
+       mov      r13d, dword ptr [rax+0x28]
        mov      rdi, gword ptr [rax+0x10]
        test     rdi, rdi
-       je       SHORT G_M37593_IG09
+       je       SHORT G_M37593_IG10
        lea      rcx, bword ptr [rdi+0x0C]
        mov      edi, dword ptr [rdi+0x08]
-       jmp      SHORT G_M37593_IG10
+       jmp      SHORT G_M37593_IG11
 						;; size=22 bbWeight=2 PerfScore 19.50
-G_M37593_IG09:
+G_M37593_IG10:
        xor      rcx, rcx
        xor      edi, edi
 						;; size=4 bbWeight=2 PerfScore 1.00
-G_M37593_IG10:
-       mov      bword ptr [rbp-0x48], rcx
-       mov      dword ptr [rbp-0x40], edi
-       cmp      byte  ptr [rax+0x2E], 9
-       jne      SHORT G_M37593_IG11
-       movzx    rdi, word  ptr [rax+0x2C]
-       mov      word  ptr [r14], di
-       mov      bword ptr [rbp-0x48], r14
-       mov      dword ptr [rbp-0x40], 1
-						;; size=32 bbWeight=2 PerfScore 20.00
 G_M37593_IG11:
-       lea      ecx, [r13+0x01]
-       mov      edx, ecx
-       mov      ecx, edx
-       jmp      SHORT G_M37593_IG18
-						;; size=10 bbWeight=2 PerfScore 6.00
+       mov      bword ptr [rbp-0x40], rcx
+       mov      dword ptr [rbp-0x38], edi
+       cmp      byte  ptr [rax+0x2E], 9
+       jne      SHORT G_M37593_IG12
+       movzx    rdi, word  ptr [rax+0x2C]
+       mov      word  ptr [rbp-0x2C], di
+       lea      rdi, bword ptr [rbp-0x2C]
+       mov      bword ptr [rbp-0x40], rdi
+       mov      dword ptr [rbp-0x38], 1
+						;; size=36 bbWeight=2 PerfScore 21.00
 G_M37593_IG12:
-       mov      edi, dword ptr [rbp-0x40]
+       lea      r12d, [r14+0x01]
+       jmp      SHORT G_M37593_IG19
+						;; size=6 bbWeight=2 PerfScore 5.00
+G_M37593_IG13:
+       mov      edi, dword ptr [rbp-0x38]
        mov      rcx, gword ptr [rax+0x10]
        mov      ecx, dword ptr [rcx+0x08]
        cmp      edi, ecx
-       jg       SHORT G_M37593_IG13
-       jmp      SHORT G_M37593_IG14
+       jg       SHORT G_M37593_IG14
+       jmp      SHORT G_M37593_IG15
 						;; size=16 bbWeight=8 PerfScore 66.00
-G_M37593_IG13:
+G_M37593_IG14:
        mov      edi, ecx
 						;; size=2 bbWeight=8 PerfScore 2.00
-G_M37593_IG14:
+G_M37593_IG15:
        xor      ecx, ecx
        test     edi, edi
-       jle      SHORT G_M37593_IG16
+       jle      SHORT G_M37593_IG17
 						;; size=6 bbWeight=8 PerfScore 12.00
-G_M37593_IG15:
-       cmp      ecx, dword ptr [rbp-0x40]
-       jae      G_M37593_IG61
-       mov      rdx, bword ptr [rbp-0x48]
+G_M37593_IG16:
+       cmp      ecx, dword ptr [rbp-0x38]
+       jae      G_M37593_IG58
+       mov      rdx, bword ptr [rbp-0x40]
        mov      esi, ecx
        movzx    rdx, word  ptr [rdx+2*rsi]
        mov      r8, gword ptr [rax+0x10]
        cmp      ecx, dword ptr [r8+0x08]
-       jae      G_M37593_IG61
+       jae      G_M37593_IG58
        cmp      dx, word  ptr [r8+2*rsi+0x0C]
-       jne      SHORT G_M37593_IG16
+       jne      SHORT G_M37593_IG17
        inc      ecx
        cmp      ecx, edi
-       jl       SHORT G_M37593_IG15
+       jl       SHORT G_M37593_IG16
 						;; size=47 bbWeight=64 PerfScore 944.00
-G_M37593_IG16:
+G_M37593_IG17:
        test     ecx, ecx
        je       G_M37593_IG21
-       cmp      ecx, dword ptr [rbp-0x40]
-       ja       G_M37593_IG59
-       mov      rax, bword ptr [rbp-0x48]
-       mov      bword ptr [rbp-0x48], rax
-       mov      dword ptr [rbp-0x40], ecx
+       cmp      ecx, dword ptr [rbp-0x38]
+       ja       G_M37593_IG56
+       mov      rax, bword ptr [rbp-0x40]
+       mov      bword ptr [rbp-0x40], rax
+       mov      dword ptr [rbp-0x38], ecx
 						;; size=28 bbWeight=8 PerfScore 50.00
-G_M37593_IG17:
-       mov      rdi, qword ptr [rbp-0x60]
-       inc      edi
-       mov      rcx, rdi
-						;; size=9 bbWeight=16 PerfScore 24.00
 G_M37593_IG18:
+       inc      r12d
+						;; size=3 bbWeight=16 PerfScore 4.00
+G_M37593_IG19:
        mov      edi, dword ptr [r15+0x10]
-       cmp      ecx, edi
-       jge      SHORT G_M37593_IG20
-       jae      G_M37593_IG60
+       cmp      r12d, edi
+       jge      SHORT G_M37593_IG21
+       jae      G_M37593_IG57
        mov      rdi, gword ptr [r15+0x08]
-       cmp      ecx, dword ptr [rdi+0x08]
-       jae      G_M37593_IG61
-       mov      qword ptr [rbp-0x60], rcx
-       mov      rdi, gword ptr [rdi+8*rcx+0x10]
+       cmp      r12d, dword ptr [rdi+0x08]
+       jae      G_M37593_IG58
+       mov      rdi, gword ptr [rdi+8*r12+0x10]
        mov      rax, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:FindBranchOneOrMultiStart():System.Text.RegularExpressions.RegexNode:this
        cmp      dword ptr [rdi], edi
        call     [rax]System.Text.RegularExpressions.RegexNode:FindBranchOneOrMultiStart():System.Text.RegularExpressions.RegexNode:this
        test     rax, rax
        je       SHORT G_M37593_IG21
-       cmp      dword ptr [rax+0x28], r12d
+       cmp      dword ptr [rax+0x28], r13d
        jne      SHORT G_M37593_IG21
        cmp      byte  ptr [rax+0x2E], 9
-       jne      G_M37593_IG12
-						;; size=71 bbWeight=16 PerfScore 396.00
-G_M37593_IG19:
-       cmp      dword ptr [rbp-0x40], 0
-       jbe      G_M37593_IG61
-       mov      rdi, bword ptr [rbp-0x48]
+       jne      G_M37593_IG13
+						;; size=69 bbWeight=16 PerfScore 380.00
+G_M37593_IG20:
+       cmp      dword ptr [rbp-0x38], 0
+       jbe      G_M37593_IG58
+       mov      rdi, bword ptr [rbp-0x40]
        movzx    rdi, word  ptr [rdi]
        cmp      di, word  ptr [rax+0x2C]
        jne      SHORT G_M37593_IG21
-       cmp      dword ptr [rbp-0x40], 1
-       je       SHORT G_M37593_IG17
-       cmp      dword ptr [rbp-0x40], 0
-       je       G_M37593_IG59
-       mov      rdi, bword ptr [rbp-0x48]
-       mov      bword ptr [rbp-0x48], rdi
-       mov      dword ptr [rbp-0x40], 1
-       jmp      G_M37593_IG17
-						;; size=59 bbWeight=8 PerfScore 136.00
-G_M37593_IG20:
-       mov      qword ptr [rbp-0x60], rcx
-						;; size=4 bbWeight=8 PerfScore 8.00
+       cmp      dword ptr [rbp-0x38], 1
+       je       SHORT G_M37593_IG18
+       cmp      dword ptr [rbp-0x38], 0
+       je       G_M37593_IG56
+       mov      rdi, bword ptr [rbp-0x40]
+       mov      bword ptr [rbp-0x40], rdi
+       mov      dword ptr [rbp-0x38], 1
+       jmp      SHORT G_M37593_IG18
+						;; size=56 bbWeight=8 PerfScore 136.00
 G_M37593_IG21:
-       mov      rdx, qword ptr [rbp-0x60]
-       mov      dword ptr [rbp-0x4C], edx
-       mov      edi, edx
-       sub      edi, r13d
+       mov      edi, r12d
+       sub      edi, r14d
        cmp      edi, 1
        jle      G_M37593_IG44
-       cmp      dword ptr [rbp-0x40], 1
+       cmp      dword ptr [rbp-0x38], 1
        jne      SHORT G_M37593_IG22
        mov      rax, 0xD1FFAB1E      ; System.Text.RegularExpressions.RegexNode
-       mov      qword ptr [rbp-0x58], rax
+       mov      qword ptr [rbp-0x48], rax
        mov      rdi, rax
        call     CORINFO_HELP_NEWSFAST
-       cmp      dword ptr [rbp-0x40], 0
-       jbe      G_M37593_IG61
-       mov      rdi, bword ptr [rbp-0x48]
+       cmp      dword ptr [rbp-0x38], 0
+       jbe      G_M37593_IG58
+       mov      rdi, bword ptr [rbp-0x40]
        movzx    rdi, word  ptr [rdi]
        mov      byte  ptr [rax+0x2E], 9
-       mov      dword ptr [rax+0x28], r12d
+       mov      dword ptr [rax+0x28], r13d
        mov      word  ptr [rax+0x2C], di
        jmp      SHORT G_M37593_IG23
-						;; size=80 bbWeight=2 PerfScore 36.50
+						;; size=74 bbWeight=2 PerfScore 32.50
 G_M37593_IG22:
        mov      rax, 0xD1FFAB1E      ; System.Text.RegularExpressions.RegexNode
-       mov      qword ptr [rbp-0x58], rax
+       mov      qword ptr [rbp-0x48], rax
        mov      rdi, rax
        call     CORINFO_HELP_NEWSFAST
-       mov      gword ptr [rbp-0x98], rax
-       lea      rdi, [rbp-0x48]
+       mov      gword ptr [rbp-0x80], rax
+       lea      rdi, [rbp-0x40]
        mov      rcx, 0xD1FFAB1E      ; code for System.ReadOnlySpan`1[char]:ToString():System.String:this
        call     [rcx]System.ReadOnlySpan`1[char]:ToString():System.String:this
-       mov      rcx, gword ptr [rbp-0x98]
+       mov      rcx, gword ptr [rbp-0x80]
        mov      byte  ptr [rcx+0x2E], 12
-       mov      dword ptr [rcx+0x28], r12d
+       mov      dword ptr [rcx+0x28], r13d
        lea      rdi, bword ptr [rcx+0x10]
        mov      rsi, rax
        call     CORINFO_HELP_ASSIGN_REF
-       mov      rax, gword ptr [rbp-0x98]
-						;; size=79 bbWeight=2 PerfScore 26.00
+       mov      rax, gword ptr [rbp-0x80]
+						;; size=70 bbWeight=2 PerfScore 26.00
 G_M37593_IG23:
-       mov      gword ptr [rbp-0x70], rax
-       mov      rdi, qword ptr [rbp-0x58]
+       mov      gword ptr [rbp-0x58], rax
+       mov      rdi, qword ptr [rbp-0x48]
        call     CORINFO_HELP_NEWSFAST
        mov      byte  ptr [rax+0x2E], 24
-       mov      dword ptr [rax+0x28], r12d
-       mov      gword ptr [rbp-0x78], rax
-       mov      esi, r13d
+       mov      dword ptr [rax+0x28], r13d
+       mov      gword ptr [rbp-0x60], rax
+       mov      esi, r14d
        mov      ecx, esi
-       mov      edx, dword ptr [rbp-0x4C]
-       cmp      r13d, edx
+       cmp      r14d, r12d
        jge      G_M37593_IG35
-						;; size=42 bbWeight=2 PerfScore 17.50
+						;; size=39 bbWeight=2 PerfScore 15.50
 G_M37593_IG24:
        cmp      ecx, dword ptr [r15+0x10]
-       jae      G_M37593_IG60
+       jae      G_M37593_IG57
        mov      rsi, gword ptr [r15+0x08]
        cmp      ecx, dword ptr [rsi+0x08]
-       jae      G_M37593_IG61
-       mov      qword ptr [rbp-0x68], rcx
-       mov      r8, gword ptr [rsi+8*rcx+0x10]
-       mov      gword ptr [rbp-0x80], r8
-       cmp      byte  ptr [r8+0x2E], 25
+       jae      G_M37593_IG58
+       mov      qword ptr [rbp-0x50], rcx
+       mov      rdx, gword ptr [rsi+8*rcx+0x10]
+       mov      gword ptr [rbp-0x68], rdx
+       cmp      byte  ptr [rdx+0x2E], 25
        jne      SHORT G_M37593_IG33
-						;; size=43 bbWeight=16 PerfScore 240.00
+						;; size=42 bbWeight=16 PerfScore 240.00
 G_M37593_IG25:
-       mov      rsi, gword ptr [r8+0x08]
+       mov      rsi, gword ptr [rdx+0x08]
        mov      rdi, rsi
        test     rdi, rdi
        je       SHORT G_M37593_IG28
 						;; size=12 bbWeight=8 PerfScore 28.00
 G_M37593_IG26:
-       mov      r9, qword ptr [rbp-0x58]
-       cmp      qword ptr [rdi], r9
+       mov      r8, qword ptr [rbp-0x48]
+       cmp      qword ptr [rdi], r8
        jne      SHORT G_M37593_IG28
 						;; size=9 bbWeight=4 PerfScore 16.00
 G_M37593_IG27:
        jmp      SHORT G_M37593_IG32
 						;; size=2 bbWeight=8 PerfScore 16.00
 G_M37593_IG28:
-       mov      r10, rsi
-       test     r10, r10
+       mov      r9, rsi
+       test     r9, r9
        je       SHORT G_M37593_IG31
 						;; size=8 bbWeight=8 PerfScore 12.00
 G_M37593_IG29:
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]
-       cmp      qword ptr [r10], rdi
+       cmp      qword ptr [r9], rdi
        je       SHORT G_M37593_IG31
 						;; size=15 bbWeight=4 PerfScore 13.00
 G_M37593_IG30:
-       mov      r10, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTCLASS_SPECIAL
-       call     [r10]CORINFO_HELP_CHKCASTCLASS_SPECIAL
-       mov      r10, rax
+       mov      r9, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTCLASS_SPECIAL
+       call     [r9]CORINFO_HELP_CHKCASTCLASS_SPECIAL
+       mov      r9, rax
 						;; size=16 bbWeight=2 PerfScore 7.00
 G_M37593_IG31:
-       cmp      dword ptr [r10+0x10], 0
-       je       G_M37593_IG60
-       mov      rsi, gword ptr [r10+0x08]
+       cmp      dword ptr [r9+0x10], 0
+       je       G_M37593_IG57
+       mov      rsi, gword ptr [r9+0x08]
        cmp      dword ptr [rsi+0x08], 0
-       jbe      G_M37593_IG61
+       jbe      G_M37593_IG58
        mov      rdi, gword ptr [rsi+0x10]
 						;; size=29 bbWeight=8 PerfScore 80.00
 G_M37593_IG32:
        jmp      SHORT G_M37593_IG34
 						;; size=2 bbWeight=8 PerfScore 16.00
 G_M37593_IG33:
-       mov      rdi, r8
+       mov      rdi, rdx
 						;; size=3 bbWeight=8 PerfScore 2.00
 G_M37593_IG34:
-       mov      rsi, bword ptr [rbp-0x48]
-       mov      rdx, qword ptr [rbp-0x40]
-       mov      r10, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ProcessOneOrMulti|43_4(System.Text.RegularExpressions.RegexNode,System.ReadOnlySpan`1[char])
-       call     [r10]System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ProcessOneOrMulti|43_4(System.Text.RegularExpressions.RegexNode,System.ReadOnlySpan`1[char])
-       mov      rdi, gword ptr [rbp-0x80]
+       mov      rsi, bword ptr [rbp-0x40]
+       mov      rdx, qword ptr [rbp-0x38]
+       mov      r9, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ProcessOneOrMulti|43_4(System.Text.RegularExpressions.RegexNode,System.ReadOnlySpan`1[char])
+       call     [r9]System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ProcessOneOrMulti|43_4(System.Text.RegularExpressions.RegexNode,System.ReadOnlySpan`1[char])
+       mov      rdi, gword ptr [rbp-0x68]
        mov      rax, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:Reduce():System.Text.RegularExpressions.RegexNode:this
        call     [rax]System.Text.RegularExpressions.RegexNode:Reduce():System.Text.RegularExpressions.RegexNode:this
        mov      rsi, rax
-       mov      rdi, gword ptr [rbp-0x78]
+       mov      rdi, gword ptr [rbp-0x60]
        mov      rax, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
        call     [rax]System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
-       mov      rdi, qword ptr [rbp-0x68]
+       mov      rdi, qword ptr [rbp-0x50]
        inc      edi
-       mov      edx, dword ptr [rbp-0x4C]
-       cmp      edi, edx
+       cmp      edi, r12d
        mov      rcx, rdi
        jl       G_M37593_IG24
-						;; size=76 bbWeight=16 PerfScore 284.00
+						;; size=74 bbWeight=16 PerfScore 268.00
 G_M37593_IG35:
        mov      rdi, gword ptr [rbx+0x18]
        test     rdi, rdi
        je       SHORT G_M37593_IG36
        cmp      byte  ptr [rdi+0x2E], 32
        jne      SHORT G_M37593_IG36
-       mov      rdi, qword ptr [rbp-0x58]
+       mov      rdi, qword ptr [rbp-0x48]
        call     CORINFO_HELP_NEWSFAST
-       mov      gword ptr [rbp-0x90], rax
+       mov      gword ptr [rbp-0x78], rax
        mov      byte  ptr [rax+0x2E], 32
-       mov      dword ptr [rax+0x28], r12d
+       mov      dword ptr [rax+0x28], r13d
        mov      rdi, rax
-       mov      rsi, gword ptr [rbp-0x78]
+       mov      rsi, gword ptr [rbp-0x60]
        mov      rcx, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
        call     [rcx]System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
-       mov      rsi, gword ptr [rbp-0x90]
-       mov      gword ptr [rbp-0x78], rsi
-						;; size=69 bbWeight=2 PerfScore 35.50
+       mov      rsi, gword ptr [rbp-0x78]
+       mov      gword ptr [rbp-0x60], rsi
+						;; size=63 bbWeight=2 PerfScore 35.50
 G_M37593_IG36:
-       mov      rdi, qword ptr [rbp-0x58]
+       mov      rdi, qword ptr [rbp-0x48]
        call     CORINFO_HELP_NEWSFAST
-       mov      gword ptr [rbp-0x88], rax
+       mov      gword ptr [rbp-0x70], rax
        mov      byte  ptr [rax+0x2E], 25
-       mov      dword ptr [rax+0x28], r12d
+       mov      dword ptr [rax+0x28], r13d
        mov      rdi, rax
-       mov      rsi, gword ptr [rbp-0x70]
+       mov      rsi, gword ptr [rbp-0x58]
        mov      rcx, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
        call     [rcx]System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
-       mov      rdi, gword ptr [rbp-0x88]
-       mov      rsi, gword ptr [rbp-0x78]
+       mov      rdi, gword ptr [rbp-0x70]
+       mov      rsi, gword ptr [rbp-0x60]
        mov      rax, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
        call     [rax]System.Text.RegularExpressions.RegexNode:AddChild(System.Text.RegularExpressions.RegexNode):this
-       mov      r12, gword ptr [rbp-0x88]
-       lea      rdi, bword ptr [r12+0x18]
+       mov      r13, gword ptr [rbp-0x70]
+       lea      rdi, bword ptr [r13+0x18]
        mov      rsi, rbx
        call     CORINFO_HELP_ASSIGN_REF
-       mov      rdi, r12
+       mov      rdi, r13
        mov      rax, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:Reduce():System.Text.RegularExpressions.RegexNode:this
        call     [rax]System.Text.RegularExpressions.RegexNode:Reduce():System.Text.RegularExpressions.RegexNode:this
-       mov      r12, rax
-       lea      rdi, bword ptr [r12+0x18]
+       mov      r13, rax
+       lea      rdi, bword ptr [r13+0x18]
        mov      rsi, rbx
        call     CORINFO_HELP_ASSIGN_REF
        mov      rsi, gword ptr [rbx+0x08]
        mov      rdi, rsi
        test     rdi, rdi
        je       SHORT G_M37593_IG38
-						;; size=129 bbWeight=2 PerfScore 53.00
+						;; size=118 bbWeight=2 PerfScore 53.00
 G_M37593_IG37:
-       mov      rax, qword ptr [rbp-0x58]
+       mov      rax, qword ptr [rbp-0x48]
        cmp      qword ptr [rdi], rax
        je       SHORT G_M37593_IG42
 						;; size=9 bbWeight=1 PerfScore 4.00
 G_M37593_IG38:
        mov      rax, rsi
        test     rax, rax
        je       SHORT G_M37593_IG41
 						;; size=8 bbWeight=2 PerfScore 3.00
 G_M37593_IG39:
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]
        cmp      qword ptr [rax], rdi
        je       SHORT G_M37593_IG41
 						;; size=15 bbWeight=1 PerfScore 3.25
 G_M37593_IG40:
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTCLASS_SPECIAL
        call     [rax]CORINFO_HELP_CHKCASTCLASS_SPECIAL
 						;; size=12 bbWeight=0.50 PerfScore 1.62
 G_M37593_IG41:
-       mov      gword ptr [rbp-0xA0], rax
-       cmp      r13d, dword ptr [rax+0x10]
-       jae      G_M37593_IG60
+       mov      gword ptr [rbp-0x88], rax
+       cmp      r14d, dword ptr [rax+0x10]
+       jae      G_M37593_IG57
        mov      rdi, gword ptr [rax+0x08]
        mov      esi, dword ptr [rdi+0x08]
-       cmp      r13, rsi
-       jae      G_M37593_IG61
-       lea      rdi, bword ptr [rdi+8*r13+0x10]
-       mov      rsi, r12
+       cmp      r14, rsi
+       jae      G_M37593_IG58
+       lea      rdi, bword ptr [rdi+8*r14+0x10]
+       mov      rsi, r13
        call     CORINFO_HELP_ASSIGN_REF
-       mov      r12, gword ptr [rbp-0xA0]
-       inc      dword ptr [r12+0x14]
+       mov      r13, gword ptr [rbp-0x88]
+       inc      dword ptr [r13+0x14]
        jmp      SHORT G_M37593_IG43
-						;; size=60 bbWeight=2 PerfScore 35.00
+						;; size=59 bbWeight=2 PerfScore 35.00
 G_M37593_IG42:
        lea      rdi, bword ptr [rbx+0x08]
-       mov      rsi, r12
+       mov      rsi, r13
        call     CORINFO_HELP_ASSIGN_REF
 						;; size=12 bbWeight=2 PerfScore 3.50
 G_M37593_IG43:
-       mov      r12d, dword ptr [rbp-0x4C]
        mov      edx, r12d
-       sub      edx, r13d
+       sub      edx, r14d
        dec      edx
-       lea      esi, [r13+0x01]
+       lea      esi, [r14+0x01]
        mov      rdi, r15
        mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:RemoveRange(int,int):this
        call     [rax]System.Collections.Generic.List`1[System.__Canon]:RemoveRange(int,int):this
-						;; size=31 bbWeight=2 PerfScore 11.50
+						;; size=27 bbWeight=2 PerfScore 9.50
 G_M37593_IG44:
-       inc      r13d
+       inc      r14d
 						;; size=3 bbWeight=4 PerfScore 1.00
 G_M37593_IG45:
        mov      edi, dword ptr [r15+0x10]
        lea      eax, [rdi-0x01]
-       cmp      r13d, eax
-       jl       G_M37593_IG07
+       cmp      r14d, eax
+       jl       G_M37593_IG08
 						;; size=16 bbWeight=4 PerfScore 15.00
 G_M37593_IG46:
        mov      rdi, rbx
        mov      rax, 0xD1FFAB1E      ; code for System.Text.RegularExpressions.RegexNode:ChildCount():int:this
        call     [rax]System.Text.RegularExpressions.RegexNode:ChildCount():int:this
        cmp      eax, 1
-       jne      G_M37593_IG56
+       jne      SHORT G_M37593_IG54
        mov      rsi, gword ptr [rbx+0x08]
        mov      rax, rsi
        test     rax, rax
        je       SHORT G_M37593_IG49
-						;; size=36 bbWeight=0.50 PerfScore 4.12
+						;; size=32 bbWeight=0.50 PerfScore 4.12
 G_M37593_IG47:
        mov      rdi, 0xD1FFAB1E      ; System.Text.RegularExpressions.RegexNode
        mov      rbx, rdi
        cmp      qword ptr [rax], rbx
        jne      SHORT G_M37593_IG49
 						;; size=18 bbWeight=0.25 PerfScore 0.88
 G_M37593_IG48:
        jmp      SHORT G_M37593_IG53
 						;; size=2 bbWeight=0.50 PerfScore 1.00
 G_M37593_IG49:
        mov      rbx, rsi
        test     rbx, rbx
        je       SHORT G_M37593_IG52
 						;; size=8 bbWeight=0.50 PerfScore 0.75
 G_M37593_IG50:
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.Text.RegularExpressions.RegexNode]
        cmp      qword ptr [rbx], rdi
        je       SHORT G_M37593_IG52
 						;; size=15 bbWeight=0.25 PerfScore 0.81
 G_M37593_IG51:
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTCLASS_SPECIAL
        call     [rax]CORINFO_HELP_CHKCASTCLASS_SPECIAL
        mov      rbx, rax
 						;; size=15 bbWeight=0.12 PerfScore 0.44
 G_M37593_IG52:
        cmp      dword ptr [rbx+0x10], 0
-       je       SHORT G_M37593_IG60
+       je       SHORT G_M37593_IG57
        mov      rax, gword ptr [rbx+0x08]
        cmp      dword ptr [rax+0x08], 0
-       jbe      SHORT G_M37593_IG61
+       jbe      SHORT G_M37593_IG58
        mov      rax, gword ptr [rax+0x10]
 						;; size=20 bbWeight=0.50 PerfScore 5.00
 G_M37593_IG53:
-       mov      r9, 0xD1FFAB1E
-       cmp      qword ptr [rbp-0x30], r9
-       je       SHORT G_M37593_IG54
-       call     CORINFO_HELP_FAIL_FAST
-						;; size=21 bbWeight=0.50 PerfScore 1.62
+       add      rsp, 104
+       pop      rbx
+       pop      r12
+       pop      r13
+       pop      r14
+       pop      r15
+       pop      rbp
+       ret      
+						;; size=15 bbWeight=0.50 PerfScore 2.12
 G_M37593_IG54:
-       nop      
-						;; size=1 bbWeight=0.50 PerfScore 0.12
+       mov      rax, rbx
+						;; size=3 bbWeight=0.50 PerfScore 0.12
 G_M37593_IG55:
-       add      rsp, 120
+       add      rsp, 104
        pop      rbx
        pop      r12
        pop      r13
        pop      r14
        pop      r15
        pop      rbp
        ret      
 						;; size=15 bbWeight=0.50 PerfScore 2.12
 G_M37593_IG56:
-       mov      rax, rbx
-       mov      r9, 0xD1FFAB1E
-       cmp      qword ptr [rbp-0x30], r9
-       je       SHORT G_M37593_IG57
-       call     CORINFO_HELP_FAIL_FAST
-						;; size=24 bbWeight=0.50 PerfScore 1.75
-G_M37593_IG57:
-       nop      
-						;; size=1 bbWeight=0.50 PerfScore 0.12
-G_M37593_IG58:
-       add      rsp, 120
-       pop      rbx
-       pop      r12
-       pop      r13
-       pop      r14
-       pop      r15
-       pop      rbp
-       ret      
-						;; size=15 bbWeight=0.50 PerfScore 2.12
-G_M37593_IG59:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRangeException()
        call     [rax]System.ThrowHelper:ThrowArgumentOutOfRangeException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
-G_M37593_IG60:
+G_M37593_IG57:
        mov      rax, 0xD1FFAB1E      ; code for System.ThrowHelper:ThrowArgumentOutOfRange_IndexMustBeLessException()
        call     [rax]System.ThrowHelper:ThrowArgumentOutOfRange_IndexMustBeLessException()
        int3     
 						;; size=13 bbWeight=0 PerfScore 0.00
-G_M37593_IG61:
+G_M37593_IG58:
        call     CORINFO_HELP_RNGCHKFAIL
        int3     
 						;; size=6 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 1477, prolog size 45, PerfScore 2744.62, instruction count 373, allocated bytes for code 1477 (MethodHash=62e66d26) for method System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ExtractCommonPrefixText|43_3(System.Text.RegularExpressions.RegexNode):System.Text.RegularExpressions.RegexNode (FullOpts)
+; Total bytes of code 1354, prolog size 31, PerfScore 2672.25, instruction count 352, allocated bytes for code 1354 (MethodHash=62e66d26) for method System.Text.RegularExpressions.RegexNode:<ReduceAlternation>g__ExtractCommonPrefixText|43_3(System.Text.RegularExpressions.RegexNode):System.Text.RegularExpressions.RegexNode (FullOpts)
 ; ============================================================

-63 (-54.31 % of base) - System.IO.Compression.ZstandardStream:ReadByte():int:this

 ; Assembly listing for method System.IO.Compression.ZstandardStream:ReadByte():int:this (FullOpts)
 ; Emitting BLENDED_CODE for x64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rsp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 0 single block inlinees; 1 inlinees without PGO data
+; 0 inlinees with PGO data; 1 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.IO.Compression.ZstandardStream>
 ;* V01 loc0         [V01    ] (  0,  0   )  struct (16) zero-ref    ld-addr-op <System.Span`1[byte]>
-;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V03 tmp1         [V03    ] (  1,  1   )  struct ( 8) [rsp+0x00]  do-not-enreg[XS] addr-exposed ld-addr-op unsafe-buffer "stackallocLocal" <UNNAMED>
-;* V04 tmp2         [V04    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op "NewObj constructor temp" <System.Span`1[byte]>
-;* V05 tmp3         [V05    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
-;* V06 tmp4         [V06    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
-;  V07 tmp5         [V07,T01] (  3,  2.50)   byref  ->  rbx         single-def "field V04._reference (fldOffset=0x0)" P-INDEP
-;* V08 tmp6         [V08    ] (  0,  0   )     int  ->  zero-ref    "field V04._length (fldOffset=0x8)" P-INDEP
-;  V09 rat0         [V09    ] (  1,  1   )    long  ->  [rsp+0x08]  do-not-enreg[X] addr-exposed "GSSecurityCookie"
+;  V02 loc1         [V02    ] (  3,  3   )   ubyte  ->  [rsp+0x04]  do-not-enreg[X] addr-exposed ld-addr-op
+;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
+;* V04 tmp1         [V04    ] (  0,  0   )  struct (16) zero-ref    multireg-arg ld-addr-op "NewObj constructor temp" <System.Span`1[byte]>
+;* V05 tmp2         [V05    ] (  0,  0   )   byref  ->  zero-ref    single-def "field V01._reference (fldOffset=0x0)" P-INDEP
+;* V06 tmp3         [V06    ] (  0,  0   )     int  ->  zero-ref    "field V01._length (fldOffset=0x8)" P-INDEP
+;* V07 tmp4         [V07,T01] (  0,  0   )   byref  ->  zero-ref    single-def "field V04._reference (fldOffset=0x0)" P-INDEP
+;* V08 tmp5         [V08    ] (  0,  0   )     int  ->  zero-ref    "field V04._length (fldOffset=0x8)" P-INDEP
 ;
-; Lcl frame size = 16
+; Lcl frame size = 8
 
 G_M3666_IG01:
-       push     rbx
-       sub      rsp, 16
-       mov      rax, 0xD1FFAB1E
-       mov      qword ptr [rsp+0x08], rax
-						;; size=20 bbWeight=1 PerfScore 2.50
+       push     rax
+						;; size=1 bbWeight=1 PerfScore 1.00
 G_M3666_IG02:
-       lea      rbx, [rsp]
-       mov      rsi, rbx
+       xor      esi, esi
+       mov      dword ptr [rsp+0x04], esi
+       lea      rsi, bword ptr [rsp+0x04]
        mov      edx, 1
        mov      rax, 0xD1FFAB1E      ; code for System.IO.Compression.ZstandardStream:Read(System.Span`1[byte]):int:this
        cmp      dword ptr [rdi], edi
        call     [rax]System.IO.Compression.ZstandardStream:Read(System.Span`1[byte]):int:this
+       movzx    rcx, byte  ptr [rsp+0x04]
+       mov      edx, -1
        test     eax, eax
-       jle      SHORT G_M3666_IG06
-						;; size=30 bbWeight=1 PerfScore 7.50
+       mov      eax, edx
+       cmovg    eax, ecx
+						;; size=47 bbWeight=1 PerfScore 9.50
 G_M3666_IG03:
-       movzx    rax, byte  ptr [rbx]
-       mov      r9, 0xD1FFAB1E
-       cmp      qword ptr [rsp+0x08], r9
-       je       SHORT G_M3666_IG04
-       call     CORINFO_HELP_FAIL_FAST
-						;; size=25 bbWeight=0.50 PerfScore 2.62
-G_M3666_IG04:
-       nop      
-						;; size=1 bbWeight=0.50 PerfScore 0.12
-G_M3666_IG05:
-       add      rsp, 16
-       pop      rbx
+       add      rsp, 8
        ret      
-						;; size=6 bbWeight=0.50 PerfScore 0.88
-G_M3666_IG06:
-       mov      eax, -1
-       mov      r9, 0xD1FFAB1E
-       cmp      qword ptr [rsp+0x08], r9
-       je       SHORT G_M3666_IG07
-       call     CORINFO_HELP_FAIL_FAST
-						;; size=27 bbWeight=0.50 PerfScore 1.75
-G_M3666_IG07:
-       nop      
-						;; size=1 bbWeight=0.50 PerfScore 0.12
-G_M3666_IG08:
-       add      rsp, 16
-       pop      rbx
-       ret      
-						;; size=6 bbWeight=0.50 PerfScore 0.88
+						;; size=5 bbWeight=1 PerfScore 1.25
 
-; Total bytes of code 116, prolog size 20, PerfScore 16.38, instruction count 30, allocated bytes for code 116 (MethodHash=feb5f1ad) for method System.IO.Compression.ZstandardStream:ReadByte():int:this (FullOpts)
+; Total bytes of code 53, prolog size 1, PerfScore 11.75, instruction count 15, allocated bytes for code 53 (MethodHash=feb5f1ad) for method System.IO.Compression.ZstandardStream:ReadByte():int: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/a83570f9ce51f8b62fb28be2b962689b

[MihuBot]

@EgorBo