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JIT: introduce redundant branch opt phase #46237

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merged 1 commit into from
Dec 19, 2020

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AndyAyersMS
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Move the redundant branch elimination out of assertion prop into its
own phase, in anticipation of future enhancements. Run it a bit earlier
(before CSE).

Move the redundant branch elimination out of assertion prop into its
own phase, in anticipation of future enhancements. Run it a bit earlier
(before CSE).
@Dotnet-GitSync-Bot Dotnet-GitSync-Bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Dec 19, 2020
@AndyAyersMS
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This is the same algorithm as before, just run earlier.

cc @dotnet/jit-contrib

There are diffs. Regressions are typically additional CSEs so hopefully come with a small perf win.

Total bytes of base: 50418452
Total bytes of diff: 50416948
Total bytes of delta: -1504 (-0.00% of base)
    diff is an improvement.

Top file regressions (bytes):
         160 : System.Collections.Concurrent.dasm (0.05% of base)
         136 : System.Text.Json.dasm (0.02% of base)
          55 : System.Collections.dasm (0.01% of base)
          36 : System.ComponentModel.TypeConverter.dasm (0.01% of base)
          28 : System.CodeDom.dasm (0.01% of base)
          22 : System.Drawing.Common.dasm (0.01% of base)
          12 : System.Net.Connections.dasm (0.04% of base)
          12 : System.IO.Pipelines.dasm (0.02% of base)
          11 : System.Private.CoreLib.dasm (0.00% of base)
           6 : System.Configuration.ConfigurationManager.dasm (0.00% of base)
           4 : System.Data.OleDb.dasm (0.00% of base)
           4 : System.Security.Cryptography.Cng.dasm (0.00% of base)
           3 : System.IO.Packaging.dasm (0.00% of base)
           3 : System.IO.FileSystem.AccessControl.dasm (0.01% of base)
           2 : System.Net.Mail.dasm (0.00% of base)
           2 : System.Security.Cryptography.Pkcs.dasm (0.00% of base)

Top file improvements (bytes):
        -720 : FSharp.Core.dasm (-0.02% of base)
        -634 : System.Private.DataContractSerialization.dasm (-0.08% of base)
        -226 : System.Data.Common.dasm (-0.02% of base)
         -51 : xunit.runner.reporters.netcoreapp10.dasm (-0.10% of base)
         -49 : Microsoft.CodeAnalysis.CSharp.dasm (-0.00% of base)
         -37 : System.Diagnostics.PerformanceCounter.dasm (-0.05% of base)
         -36 : System.Private.Xml.dasm (-0.00% of base)
         -34 : Newtonsoft.Json.dasm (-0.00% of base)
         -33 : CommandLine.dasm (-0.01% of base)
         -18 : Microsoft.Diagnostics.Tracing.TraceEvent.dasm (-0.00% of base)
         -16 : System.Formats.Asn1.dasm (-0.02% of base)
         -15 : xunit.assert.dasm (-0.01% of base)
         -15 : xunit.core.dasm (-0.02% of base)
         -15 : xunit.execution.dotnet.dasm (-0.01% of base)
         -11 : System.DirectoryServices.dasm (-0.00% of base)
         -11 : System.Data.Odbc.dasm (-0.01% of base)
         -10 : System.DirectoryServices.AccountManagement.dasm (-0.00% of base)
         -10 : Microsoft.VisualBasic.Core.dasm (-0.00% of base)
          -8 : System.Net.Http.dasm (-0.00% of base)
          -8 : System.Runtime.Serialization.Formatters.dasm (-0.01% of base)

49 total files with Code Size differences (33 improved, 16 regressed), 220 unchanged.

Top method regressions (bytes):
          55 ( 1.43% of base) : System.Collections.dasm - SortedList`2:System.Collections.IDictionary.Add(Object,Object):this (7 methods)
          54 ( 2.71% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.set_Item(Object,Object):this (7 methods)
          48 ( 2.35% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.Add(Object,Object):this (7 methods)
          43 ( 3.25% of base) : FSharp.Core.dasm - HashCompare:GenericEqualityObj(bool,IEqualityComparer,Object,Object):bool
          23 ( 3.73% of base) : System.ComponentModel.TypeConverter.dasm - RectangleConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
          22 ( 1.98% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.get_Item(Object):Object:this (7 methods)
          21 ( 1.72% of base) : System.Private.CoreLib.dasm - ValueTuple`1:System.Collections.IStructuralEquatable.Equals(Object,IEqualityComparer):bool:this (7 methods)
          21 ( 1.08% of base) : System.Private.CoreLib.dasm - ValueTuple`2:System.Collections.IStructuralEquatable.Equals(Object,IEqualityComparer):bool:this (7 methods)
          19 ( 3.01% of base) : System.Drawing.Common.dasm - MarginsConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
          18 ( 2.00% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.Contains(Object):bool:this (7 methods)
          18 ( 2.22% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.Remove(Object):this (7 methods)
          18 ( 1.19% of base) : System.Private.CoreLib.dasm - EqualityComparer`1:System.Collections.IEqualityComparer.Equals(Object,Object):bool:this (7 methods)
          13 ( 0.58% of base) : System.Text.Json.dasm - Utf8JsonReader:UnescapeSequenceAndCompare(ReadOnlySpan`1):bool:this
          12 ( 0.53% of base) : System.Net.Connections.dasm - <ReadAsync>d__20:MoveNext():this
          12 ( 0.64% of base) : Newtonsoft.Json.dasm - JsonWriter:WriteToken(int,Object):this
          12 ( 0.63% of base) : Newtonsoft.Json.dasm - JsonWriter:WriteTokenAsync(int,Object,CancellationToken):Task:this
          12 ( 3.14% of base) : System.ComponentModel.TypeConverter.dasm - PointConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
          12 ( 3.14% of base) : System.ComponentModel.TypeConverter.dasm - SizeConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
          12 ( 0.56% of base) : System.IO.Pipelines.dasm - <ReadAsyncInternal>d__27:MoveNext():this
          12 ( 0.33% of base) : System.Text.Json.dasm - JsonDocument:TryParseValue(byref,byref,bool,bool):bool

Top method improvements (bytes):
        -317 (-25.50% of base) : System.Private.DataContractSerialization.dasm - XmlBaseWriter:WritePrimitiveValue(Object):this
        -317 (-24.90% of base) : System.Private.DataContractSerialization.dasm - XmlJsonWriter:WritePrimitiveValue(Object):this
         -68 (-8.76% of base) : System.Private.CoreLib.dasm - DynamicResolver:ResolveToken(int,byref,byref,byref):this
         -55 (-8.10% of base) : Newtonsoft.Json.dasm - JValue:GetValueType(Nullable`1,Object):int
         -51 (-6.48% of base) : xunit.runner.reporters.netcoreapp10.dasm - JsonExtentions:AddValue(StringBuilder,String,Object)
         -40 (-6.58% of base) : System.Data.Common.dasm - XPathNodePointer:MoveToPreviousSibling():bool:this
         -37 (-2.61% of base) : System.Diagnostics.PerformanceCounter.dasm - PerformanceCounterLib:FindCustomCategory(String,byref):bool:this
         -33 (-14.41% of base) : CommandLine.dasm - UnParserExtensions:IsEmpty(Object):bool
         -33 (-4.67% of base) : Microsoft.CodeAnalysis.CSharp.dasm - SyntaxNormalizer:GetDeclarationDepth(SyntaxNode):int
         -31 (-7.28% of base) : System.Private.Xml.dasm - Processor:GetGlobalParameter(XmlQualifiedName):Object:this
         -27 (-5.38% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkEqualsQmark(Nullable`1,Nullable`1):bool (6 methods)
         -27 (-31.76% of base) : System.Data.Common.dasm - DataPointer:IsFoliated(XmlNode):bool
         -25 (-7.06% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkGreaterEqualsQmark(Nullable`1,Nullable`1):bool (6 methods)
         -25 (-7.06% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkGreaterQmark(Nullable`1,Nullable`1):bool (6 methods)
         -25 (-7.06% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkLessEqualsQmark(Nullable`1,Nullable`1):bool (6 methods)
         -25 (-7.06% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkLessQmark(Nullable`1,Nullable`1):bool (6 methods)
         -20 (-26.67% of base) : System.Data.Common.dasm - XPathNodePointer:IsFoliated(XmlNode):bool:this
         -20 (-2.65% of base) : System.Data.Common.dasm - Select:GetLinearFilteredRecords(Range):ref:this
         -19 (-19.79% of base) : System.ComponentModel.TypeConverter.dasm - HelpKeywordAttribute:Equals(Object):bool:this
         -18 (-1.03% of base) : Microsoft.CodeAnalysis.CSharp.dasm - ConversionsBase:UniqueIndex(ImmutableArray`1,Func`2):BestIndex (7 methods)

Top method regressions (percentages):
           7 ( 4.67% of base) : System.CodeDom.dasm - VBCodeGenerator:get_IsCurrentModule():bool:this
          23 ( 3.73% of base) : System.ComponentModel.TypeConverter.dasm - RectangleConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
           7 ( 3.26% of base) : System.Private.CoreLib.dasm - Double:CompareTo(Object):int:this
           7 ( 3.26% of base) : System.Private.CoreLib.dasm - Single:CompareTo(Object):int:this
          43 ( 3.25% of base) : FSharp.Core.dasm - HashCompare:GenericEqualityObj(bool,IEqualityComparer,Object,Object):bool
           6 ( 3.17% of base) : System.Security.Cryptography.Cng.dasm - CngKey:SetProperty(CngProperty):this
          12 ( 3.14% of base) : System.ComponentModel.TypeConverter.dasm - PointConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
          12 ( 3.14% of base) : System.ComponentModel.TypeConverter.dasm - SizeConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
          19 ( 3.01% of base) : System.Drawing.Common.dasm - MarginsConverter:CreateInstance(ITypeDescriptorContext,IDictionary):Object:this
          11 ( 2.73% of base) : Microsoft.CodeAnalysis.CSharp.dasm - TypeSymbol:IsExplicitlyImplementedViaAccessors(Symbol,TypeSymbol,byref):bool
          54 ( 2.71% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.set_Item(Object,Object):this (7 methods)
           6 ( 2.58% of base) : Microsoft.CodeAnalysis.CSharp.dasm - MemberSemanticModel:GetLambdaParameterSymbol(ParameterSyntax,ExpressionSyntax,CancellationToken):ParameterSymbol:this
          48 ( 2.35% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.Add(Object,Object):this (7 methods)
           3 ( 2.29% of base) : System.CodeDom.dasm - VBCodeGenerator:GetUserData(CodeObject,String,bool):bool:this
           3 ( 2.29% of base) : System.CodeDom.dasm - CSharpCodeGenerator:GetUserData(CodeObject,String,bool):bool:this
           3 ( 2.26% of base) : System.CodeDom.dasm - VBCodeGenerator:AllowLateBound(CodeCompileUnit):bool:this
           3 ( 2.26% of base) : System.CodeDom.dasm - VBCodeGenerator:RequireVariableDeclaration(CodeCompileUnit):bool:this
          18 ( 2.22% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.Remove(Object):this (7 methods)
          18 ( 2.00% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.Contains(Object):bool:this (7 methods)
          22 ( 1.98% of base) : System.Collections.Concurrent.dasm - ConcurrentDictionary`2:System.Collections.IDictionary.get_Item(Object):Object:this (7 methods)

Top method improvements (percentages):
         -27 (-31.76% of base) : System.Data.Common.dasm - DataPointer:IsFoliated(XmlNode):bool
         -20 (-26.67% of base) : System.Data.Common.dasm - XPathNodePointer:IsFoliated(XmlNode):bool:this
        -317 (-25.50% of base) : System.Private.DataContractSerialization.dasm - XmlBaseWriter:WritePrimitiveValue(Object):this
        -317 (-24.90% of base) : System.Private.DataContractSerialization.dasm - XmlJsonWriter:WritePrimitiveValue(Object):this
         -19 (-19.79% of base) : System.ComponentModel.TypeConverter.dasm - HelpKeywordAttribute:Equals(Object):bool:this
         -33 (-14.41% of base) : CommandLine.dasm - UnParserExtensions:IsEmpty(Object):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkGreaterEquals(Nullable`1,long):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkGreater(Nullable`1,long):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkLessEquals(Nullable`1,long):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkLess(Nullable`1,long):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkEquals(Nullable`1,long):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_GreaterEqualsQmark(long,Nullable`1):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_GreaterQmark(long,Nullable`1):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_LessEqualsQmark(long,Nullable`1):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_LessQmark(long,Nullable`1):bool
          -3 (-13.64% of base) : FSharp.Core.dasm - NullableOperators:op_EqualsQmark(long,Nullable`1):bool
          -3 (-11.54% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkGreaterEquals(Nullable`1,double):bool
          -3 (-11.54% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkGreater(Nullable`1,double):bool
          -3 (-11.54% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkLessEquals(Nullable`1,double):bool
          -3 (-11.54% of base) : FSharp.Core.dasm - NullableOperators:op_QmarkLess(Nullable`1,double):bool

315 total methods with Code Size differences (239 improved, 76 regressed), 258514 unchanged.

@@ -4882,6 +4884,11 @@ void Compiler::compCompile(void** methodCodePtr, ULONG* methodCodeSize, JitFlags
DoPhase(this, PHASE_VN_COPY_PROP, &Compiler::optVnCopyProp);
}

if (doBranchOpt)
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Earlier, we would do redundant branch elimination after CSE and now we do it before. Is that the source of diff?

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Yes

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LGTM, with a question on why we see improvements with this change.

@AndyAyersMS AndyAyersMS merged commit c6d988f into dotnet:master Dec 19, 2020
@AndyAyersMS AndyAyersMS deleted the RedundantBranchOptPhase branch December 19, 2020 16:25
@ghost ghost locked as resolved and limited conversation to collaborators Jan 18, 2021
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