forked from OSchip/llvm-project
[CodeView] Add CodeView support for PGO debug information
This change adds debug information about whether PGO is being used or not. Microsoft performance tooling (e.g. xperf, WPA) uses this information to show whether functions are optimized with PGO or not, as well as whether PGO information is invalid. This information is useful for validating whether training scenarios are providing good coverage of real world scenarios, showing if profile data is out of date, etc. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D99994
This commit is contained in:
Michael Holman
Reid Kleckner
parent
c4a83c4e69
commit
77357208c4
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@ -804,6 +804,9 @@ void CodeViewDebug::emitCompilerInformation() {
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// The low byte of the flags indicates the source language.
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Flags = MapDWLangToCVLang(CU->getSourceLanguage());
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// TODO: Figure out which other flags need to be set.
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if (MMI->getModule()->getProfileSummary(/*IsCS*/ false) != nullptr) {
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Flags |= static_cast<uint32_t>(CompileSym3Flags::PGO);
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}
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OS.AddComment("Flags and language");
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OS.emitInt32(Flags);
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@ -1428,6 +1431,10 @@ void CodeViewDebug::beginFunctionImpl(const MachineFunction *MF) {
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if (Asm->TM.getOptLevel() != CodeGenOpt::None &&
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!GV.hasOptSize() && !GV.hasOptNone())
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FPO |= FrameProcedureOptions::OptimizedForSpeed;
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if (GV.hasProfileData()) {
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FPO |= FrameProcedureOptions::ValidProfileCounts;
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FPO |= FrameProcedureOptions::ProfileGuidedOptimization;
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}
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// FIXME: Set GuardCfg when it is implemented.
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CurFn->FrameProcOpts = FPO;
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@ -0,0 +1,165 @@
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; RUN: llc < %s -filetype=obj | llvm-readobj --codeview - | FileCheck %s
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; CHECK: Compile3Sym {
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; CHECK: Flags [ (0x40000)
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; CHECK: PGO (0x40000)
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; CHECK: DisplayName: foo
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; CHECK: Kind: S_FRAMEPROC (0x1012)
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; CHECK: ProfileGuidedOptimization (0x40000)
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; CHECK: ValidProfileCounts (0x80000)
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; CHECK: DisplayName: foo2
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; CHECK: Kind: S_FRAMEPROC (0x1012)
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; CHECK: ProfileGuidedOptimization (0x40000)
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; CHECK: ValidProfileCounts (0x80000)
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; CHECK: DisplayName: bar
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; CHECK: Kind: S_FRAMEPROC (0x1012)
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; CHECK: ProfileGuidedOptimization (0x40000)
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; CHECK: ValidProfileCounts (0x80000)
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; CHECK: DisplayName: main
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; CHECK: Kind: S_FRAMEPROC (0x1012)
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; CHECK-NOT: ProfileGuidedOptimization (0x40000)
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; CHECK-NOT: ValidProfileCounts (0x80000)
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source_filename = "pgo.cpp"
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target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.28.29912"
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define dso_local i32 @"?foo@@YAHH@Z"(i32 %b) local_unnamed_addr #1 !dbg !43 !prof !49 {
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entry:
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call void @llvm.dbg.value(metadata i32 %b, metadata !48, metadata !DIExpression()), !dbg !50
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%mul = mul nsw i32 %b, 10, !dbg !51
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ret i32 %mul, !dbg !51
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}
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define dso_local i32 @"?foo2@@YAHH@Z"(i32 %a) local_unnamed_addr #1 !dbg !52 !prof !55 {
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entry:
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call void @llvm.dbg.value(metadata i32 %a, metadata !54, metadata !DIExpression()), !dbg !56
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%mul = mul nsw i32 %a, 5, !dbg !57
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ret i32 %mul, !dbg !57
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}
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define dso_local i32 @"?bar@@YAHH@Z"(i32 %num) local_unnamed_addr #1 !dbg !58 !prof !55 {
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entry:
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call void @llvm.dbg.value(metadata i32 undef, metadata !60, metadata !DIExpression()), !dbg !61
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%call = tail call i32 @"?foo@@YAHH@Z"(i32 1) #1, !dbg !62
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%call1 = tail call i32 @"?foo2@@YAHH@Z"(i32 2) #1, !dbg !62
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%mul = mul nsw i32 %call1, %call, !dbg !62
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%call2 = tail call i32 @"?foo2@@YAHH@Z"(i32 3) #1, !dbg !62
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%mul3 = mul nsw i32 %mul, %call2, !dbg !62
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ret i32 %mul3, !dbg !62
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}
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define dso_local i32 @main(i32 %argc, i8** nocapture readnone %argv) local_unnamed_addr #1 !dbg !63 !annotation !72 {
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entry:
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call void @llvm.dbg.value(metadata i8** %argv, metadata !70, metadata !DIExpression()), !dbg !73
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call void @llvm.dbg.value(metadata i32 %argc, metadata !71, metadata !DIExpression()), !dbg !73
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%cmp = icmp eq i32 %argc, 2, !dbg !74
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br i1 %cmp, label %return, label %if.end, !dbg !74
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if.end: ; preds = %entry
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%cmp1 = icmp slt i32 %argc, 5, !dbg !75
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br i1 %cmp1, label %if.then2, label %if.else, !dbg !75
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if.then2: ; preds = %if.end
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%call = tail call i32 @"?bar@@YAHH@Z"(i32 undef) #1, !dbg !76
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br label %return, !dbg !76
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if.else: ; preds = %if.end
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%call3 = tail call i32 @"?foo@@YAHH@Z"(i32 %argc) #1, !dbg !79
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br label %return, !dbg !79
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return: ; preds = %entry, %if.else, %if.then2
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%retval.0 = phi i32 [ %call, %if.then2 ], [ %call3, %if.else ], [ 0, %entry ], !dbg !73
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ret i32 %retval.0, !dbg !81
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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attributes #1 = { optsize }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5, !6, !7, !8, !9, !38}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 13.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "pgo.cpp", directory: "")
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!2 = !{}
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!5 = !{i32 2, !"CodeView", i32 1}
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!6 = !{i32 2, !"Debug Info Version", i32 3}
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!7 = !{i32 1, !"wchar_size", i32 2}
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!8 = !{i32 7, !"PIC Level", i32 2}
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!9 = !{i32 1, !"ProfileSummary", !10}
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!10 = !{!11, !12, !13, !14, !15, !16, !17, !18, !19, !20}
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!11 = !{!"ProfileFormat", !"InstrProf"}
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!12 = !{!"TotalCount", i64 2}
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!13 = !{!"MaxCount", i64 1}
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!14 = !{!"MaxInternalCount", i64 1}
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!15 = !{!"MaxFunctionCount", i64 1}
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!16 = !{!"NumCounts", i64 5}
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!17 = !{!"NumFunctions", i64 4}
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!18 = !{!"IsPartialProfile", i64 0}
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!19 = !{!"PartialProfileRatio", double 0.000000e+00}
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!20 = !{!"DetailedSummary", !21}
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!21 = !{!22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34, !35, !36, !37}
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!22 = !{i32 10000, i64 0, i32 0}
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!23 = !{i32 100000, i64 0, i32 0}
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!24 = !{i32 200000, i64 0, i32 0}
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!25 = !{i32 300000, i64 0, i32 0}
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!26 = !{i32 400000, i64 0, i32 0}
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!27 = !{i32 500000, i64 1, i32 2}
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!28 = !{i32 600000, i64 1, i32 2}
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!29 = !{i32 700000, i64 1, i32 2}
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!30 = !{i32 800000, i64 1, i32 2}
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!31 = !{i32 900000, i64 1, i32 2}
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!32 = !{i32 950000, i64 1, i32 2}
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!33 = !{i32 990000, i64 1, i32 2}
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!34 = !{i32 999000, i64 1, i32 2}
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!35 = !{i32 999900, i64 1, i32 2}
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!36 = !{i32 999990, i64 1, i32 2}
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!37 = !{i32 999999, i64 1, i32 2}
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!38 = !{i32 5, !"CG Profile", !39}
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!39 = !{!40, !41}
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!40 = !{i32 (i32)* @"?bar@@YAHH@Z", i32 (i32)* @"?foo@@YAHH@Z", i64 0}
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!41 = !{i32 (i32)* @"?bar@@YAHH@Z", i32 (i32)* @"?foo2@@YAHH@Z", i64 0}
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!43 = distinct !DISubprogram(name: "foo", linkageName: "?foo@@YAHH@Z", scope: !1, file: !1, line: 2, type: !44, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !47)
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!44 = !DISubroutineType(types: !45)
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!45 = !{!46, !46}
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!46 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!47 = !{!48}
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!48 = !DILocalVariable(name: "b", arg: 1, scope: !43, file: !1, line: 2, type: !46)
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!49 = !{!"function_entry_count", i64 1}
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!50 = !DILocation(line: 0, scope: !43)
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!51 = !DILocation(line: 3, scope: !43)
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!52 = distinct !DISubprogram(name: "foo2", linkageName: "?foo2@@YAHH@Z", scope: !1, file: !1, line: 5, type: !44, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !53)
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!53 = !{!54}
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!54 = !DILocalVariable(name: "a", arg: 1, scope: !52, file: !1, line: 5, type: !46)
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!55 = !{!"function_entry_count", i64 0}
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!56 = !DILocation(line: 0, scope: !52)
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!57 = !DILocation(line: 6, scope: !52)
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!58 = distinct !DISubprogram(name: "bar", linkageName: "?bar@@YAHH@Z", scope: !1, file: !1, line: 8, type: !44, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !59)
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!59 = !{!60}
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!60 = !DILocalVariable(name: "num", arg: 1, scope: !58, file: !1, line: 8, type: !46)
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!61 = !DILocation(line: 0, scope: !58)
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!62 = !DILocation(line: 9, scope: !58)
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!63 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 11, type: !64, scopeLine: 12, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !69)
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!64 = !DISubroutineType(types: !65)
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!65 = !{!46, !46, !66}
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!66 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !67, size: 64)
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!67 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !68, size: 64)
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!68 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!69 = !{!70, !71}
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!70 = !DILocalVariable(name: "argv", arg: 2, scope: !63, file: !1, line: 11, type: !66)
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!71 = !DILocalVariable(name: "argc", arg: 1, scope: !63, file: !1, line: 11, type: !46)
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!72 = !{!"instr_prof_hash_mismatch"}
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!73 = !DILocation(line: 0, scope: !63)
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!74 = !DILocation(line: 13, scope: !63)
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!75 = !DILocation(line: 16, scope: !63)
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!76 = !DILocation(line: 17, scope: !77)
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!77 = distinct !DILexicalBlock(scope: !78, file: !1, line: 16)
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!78 = distinct !DILexicalBlock(scope: !63, file: !1, line: 16)
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!79 = !DILocation(line: 19, scope: !80)
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!80 = distinct !DILexicalBlock(scope: !78, file: !1, line: 18)
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!81 = !DILocation(line: 21, scope: !63)
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