[llvm] 062af2e - [CSSPGO] Support stale profile matching for LTO
via llvm-commits
llvm-commits at lists.llvm.org
Wed Aug 30 18:01:36 PDT 2023
Author: wlei
Date: 2023-08-30T18:00:23-07:00
New Revision: 062af2e76366ec1e4f3201f95c1a961a1861ba58
URL: https://github.com/llvm/llvm-project/commit/062af2e76366ec1e4f3201f95c1a961a1861ba58
DIFF: https://github.com/llvm/llvm-project/commit/062af2e76366ec1e4f3201f95c1a961a1861ba58.diff
LOG: [CSSPGO] Support stale profile matching for LTO
As in per-link time, callsites could be optimized out by inlining, we don't have those original call targets in the IR in LTO time. Additionally, the inlined code doesn't actually belong to the original function, the IR locations or pseudo probe parsed from it are incorrect and could mislead the matching later.
This change adds the support to extract the original IR location info from the inlined code, specifically, it make sure to skip all the inlined code that doesn't belong the original function, but before that, it processes the inline frames of the debug info to extract the base frame and recover its callsite and callee target(name).
Measured on some stale profile instances, all showed some perf improvements.
Reviewed By: hoy, wenlei
Differential Revision: https://reviews.llvm.org/D156722
Added:
llvm/test/Transforms/SampleProfile/Inputs/pseudo-probe-stale-profile-matching-lto.prof
llvm/test/Transforms/SampleProfile/pseudo-probe-stale-profile-matching-lto.ll
Modified:
llvm/lib/Transforms/IPO/SampleProfile.cpp
Removed:
################################################################################
diff --git a/llvm/lib/Transforms/IPO/SampleProfile.cpp b/llvm/lib/Transforms/IPO/SampleProfile.cpp
index 38a21240c47dd8..6deee9a2134cd2 100644
--- a/llvm/lib/Transforms/IPO/SampleProfile.cpp
+++ b/llvm/lib/Transforms/IPO/SampleProfile.cpp
@@ -2123,10 +2123,29 @@ void SampleProfileMatcher::findIRAnchors(
// Extract profile matching anchors in the IR.
for (auto &BB : F) {
for (auto &I : BB) {
- // TODO: Support line-number based location(AutoFDO).
+ // TODO: To support AutoFDO, we need to parse all the non-call
+ // instructions to extract the line-number based locations. For
+ // pseudo-probe mode, since each block is instrumented with one probe
+ // inst, parsing probe inst is enough.
if (FunctionSamples::ProfileIsProbeBased && isa<PseudoProbeInst>(&I)) {
- if (std::optional<PseudoProbe> Probe = extractProbe(I))
- IRAnchors.emplace(LineLocation(Probe->Id, 0), StringRef());
+ std::optional<PseudoProbe> Probe = extractProbe(I);
+ assert(Probe &&
+ "Probe should not be null for pseudo-probe instruction");
+ // Flatten inlined IR for the matching. Recover the original callsite
+ // and call target by analyzing the inline frames from the debug info.
+ if (DILocation *DIL = I.getDebugLoc()) {
+ if (DIL->getInlinedAt()) {
+ // Find the top-level inline frame.
+ const DILocation *PrevDIL = DIL;
+ for (; DIL->getInlinedAt(); DIL = DIL->getInlinedAt())
+ PrevDIL = DIL;
+
+ LineLocation Callsite = FunctionSamples::getCallSiteIdentifier(DIL);
+ StringRef CalleeName = PrevDIL->getSubprogramLinkageName();
+ IRAnchors.emplace(Callsite, CalleeName);
+ } else
+ IRAnchors.emplace(LineLocation(Probe->Id, 0), StringRef());
+ }
}
if (!isa<CallBase>(&I) || isa<IntrinsicInst>(&I))
@@ -2134,6 +2153,11 @@ void SampleProfileMatcher::findIRAnchors(
const auto *CB = dyn_cast<CallBase>(&I);
if (auto &DLoc = I.getDebugLoc()) {
+ // Skip the inlined callsite. For pseudo probe mode, extracting inline
+ // info from the probe inst is enough.
+ if (DLoc.getInlinedAt())
+ continue;
+
LineLocation IRCallsite = FunctionSamples::getCallSiteIdentifier(DLoc);
StringRef CalleeName = UnknownIndirectCallee;
if (Function *Callee = CB->getCalledFunction())
diff --git a/llvm/test/Transforms/SampleProfile/Inputs/pseudo-probe-stale-profile-matching-lto.prof b/llvm/test/Transforms/SampleProfile/Inputs/pseudo-probe-stale-profile-matching-lto.prof
new file mode 100644
index 00000000000000..9d3388eae0b322
--- /dev/null
+++ b/llvm/test/Transforms/SampleProfile/Inputs/pseudo-probe-stale-profile-matching-lto.prof
@@ -0,0 +1,26 @@
+main:6822:0
+ 1: 0
+ 2: 614
+ 3: 614
+ 4: 603
+ 5: 0
+ 7: 631 bar:631
+ 9: 636 bar:636
+ 6: foo:1900
+ 1: 614
+ 2: 554
+ 3: 59
+ 4: 614
+ 6: 59 bar:59
+ !CFGChecksum: 563022570642068
+ 8: foo:1859
+ 1: 589
+ 2: 526
+ 3: 63
+ 4: 618
+ 6: 63 bar:65
+ !CFGChecksum: 563022570642068
+ !CFGChecksum: 1125988587804525
+bar:2401:2401
+ 1: 2401
+ !CFGChecksum: 4294967295
diff --git a/llvm/test/Transforms/SampleProfile/pseudo-probe-stale-profile-matching-lto.ll b/llvm/test/Transforms/SampleProfile/pseudo-probe-stale-profile-matching-lto.ll
new file mode 100644
index 00000000000000..55225b415d4abc
--- /dev/null
+++ b/llvm/test/Transforms/SampleProfile/pseudo-probe-stale-profile-matching-lto.ll
@@ -0,0 +1,252 @@
+; REQUIRES: x86_64-linux
+; REQUIRES: asserts
+; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/pseudo-probe-stale-profile-matching-lto.prof --salvage-stale-profile -S --debug-only=sample-profile,sample-profile-impl 2>&1 | FileCheck %s
+
+
+; CHECK: Run stale profile matching for main
+
+; CHECK: Location is matched from 1 to 1
+; CHECK: Location is matched from 2 to 2
+; CHECK: Location is matched from 4 to 4
+; CHECK: Location is matched from 6 to 6
+; CHECK: Location is matched from 7 to 7
+; CHECK: Location is matched from 8 to 8
+; CHECK: Location is matched from 10 to 10
+
+; CHECK: Callsite with callee:foo is matched from 12 to 6
+; CHECK: Location is rematched backwards from 7 to 1
+; CHECK: Location is rematched backwards from 8 to 2
+; CHECK: Location is rematched backwards from 10 to 4
+; CHECK: Callsite with callee:bar is matched from 13 to 7
+; CHECK: Callsite with callee:foo is matched from 14 to 8
+; CHECK: Callsite with callee:bar is matched from 15 to 9
+
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+ at x = internal global i32 1, align 4, !dbg !0
+
+; Function Attrs: nounwind uwtable
+define dso_local i32 @main() local_unnamed_addr #0 !dbg !49 !prof !55 {
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 1, i32 0, i64 -1), !dbg !56
+ call void @llvm.dbg.value(metadata i32 0, metadata !53, metadata !DIExpression()), !dbg !57
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 2, i32 0, i64 6148914874488455168), !dbg !58
+ br label %1, !dbg !61
+
+1: ; preds = %17, %0
+ %2 = phi i32 [ 0, %0 ], [ %28, %17 ]
+ call void @llvm.dbg.value(metadata i32 %2, metadata !53, metadata !DIExpression()), !dbg !57
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 4, i32 0, i64 -1), !dbg !63
+ %3 = load volatile i32, ptr @x, align 4, !dbg !65, !tbaa !66
+ call void @llvm.dbg.value(metadata i32 %2, metadata !70, metadata !DIExpression()), !dbg !76
+ call void @llvm.dbg.value(metadata i32 %3, metadata !75, metadata !DIExpression()), !dbg !76
+ call void @llvm.pseudoprobe(i64 6699318081062747564, i64 1, i32 0, i64 -1), !dbg !79
+ %4 = urem i32 %2, 10, !dbg !81
+ %5 = icmp eq i32 %4, 0, !dbg !81
+ %6 = zext i1 %5 to i32, !dbg !82
+ %7 = add nsw i32 %3, %6, !dbg !82
+ %8 = call i32 @bar(i32 noundef %7) #4, !dbg !83, !prof !84
+ call void @llvm.pseudoprobe(i64 6699318081062747564, i64 4, i32 0, i64 -1), !dbg !85
+ %9 = load volatile i32, ptr @x, align 4, !dbg !86, !tbaa !66
+ %10 = add nsw i32 %9, %8, !dbg !86
+ store volatile i32 %10, ptr @x, align 4, !dbg !86, !tbaa !66
+ %11 = load volatile i32, ptr @x, align 4, !dbg !87, !tbaa !66
+ %12 = call i32 @bar(i32 noundef %11) #4, !dbg !88, !prof !90
+ %13 = load volatile i32, ptr @x, align 4, !dbg !91, !tbaa !66
+ %14 = add nsw i32 %13, %12, !dbg !91
+ store volatile i32 %14, ptr @x, align 4, !dbg !91, !tbaa !66
+ %15 = load volatile i32, ptr @x, align 4, !dbg !92, !tbaa !66
+ %16 = icmp slt i32 %15, 0, !dbg !94
+ br i1 %16, label %30, label %17, !dbg !95, !prof !96
+
+17: ; preds = %1
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 6, i32 0, i64 -1), !dbg !97
+ %18 = load volatile i32, ptr @x, align 4, !dbg !98, !tbaa !66
+ call void @llvm.dbg.value(metadata i32 %2, metadata !70, metadata !DIExpression()), !dbg !99
+ call void @llvm.dbg.value(metadata i32 %18, metadata !75, metadata !DIExpression()), !dbg !99
+ call void @llvm.pseudoprobe(i64 6699318081062747564, i64 1, i32 0, i64 -1), !dbg !102
+ %19 = zext i1 %5 to i32, !dbg !103
+ %20 = add nsw i32 %18, %19, !dbg !103
+ %21 = call i32 @bar(i32 noundef %20) #4, !dbg !104, !prof !84
+ call void @llvm.pseudoprobe(i64 6699318081062747564, i64 4, i32 0, i64 -1), !dbg !105
+ %22 = load volatile i32, ptr @x, align 4, !dbg !106, !tbaa !66
+ %23 = add nsw i32 %22, %21, !dbg !106
+ store volatile i32 %23, ptr @x, align 4, !dbg !106, !tbaa !66
+ %24 = load volatile i32, ptr @x, align 4, !dbg !107, !tbaa !66
+ %25 = call i32 @bar(i32 noundef %24) #4, !dbg !108, !prof !90
+ %26 = load volatile i32, ptr @x, align 4, !dbg !110, !tbaa !66
+ %27 = add nsw i32 %26, %25, !dbg !110
+ store volatile i32 %27, ptr @x, align 4, !dbg !110, !tbaa !66
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 7, i32 0, i64 -1), !dbg !111
+ %28 = add nuw nsw i32 %2, 1, !dbg !112
+ call void @llvm.dbg.value(metadata i32 %28, metadata !53, metadata !DIExpression()), !dbg !57
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 2, i32 0, i64 -6148914324732641280), !dbg !58
+ %29 = icmp eq i32 %28, 1000000, !dbg !114
+ br i1 %29, label %30, label %1, !dbg !61, !prof !116, !llvm.loop !117
+
+30: ; preds = %17, %1
+ %31 = phi i32 [ 1, %1 ], [ 0, %17 ]
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 8, i32 0, i64 -1), !dbg !121
+ call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 10, i32 0, i64 -1), !dbg !122
+ ret i32 %31, !dbg !122
+}
+
+; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite)
+declare void @llvm.pseudoprobe(i64, i64, i32, i64) #1
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare void @llvm.dbg.value(metadata, metadata, metadata) #2
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
+define available_externally dso_local i32 @bar(i32 noundef %0) local_unnamed_addr #3 !dbg !123 !prof !128 {
+ call void @llvm.dbg.value(metadata i32 %0, metadata !127, metadata !DIExpression()), !dbg !129
+ call void @llvm.pseudoprobe(i64 -2012135647395072713, i64 1, i32 0, i64 -1), !dbg !130
+ %2 = add nsw i32 %0, 1, !dbg !131
+ ret i32 %2, !dbg !132
+}
+
+attributes #0 = { nounwind uwtable "disable-tail-calls"="true" "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "use-sample-profile" }
+attributes #1 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite) }
+attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
+attributes #3 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable "disable-tail-calls"="true" "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "use-sample-profile" }
+attributes #4 = { nounwind }
+
+!llvm.dbg.cu = !{!2, !7}
+!llvm.module.flags = !{!9, !10, !11, !12, !13, !14, !15, !16, !17}
+!llvm.ident = !{!46, !46}
+!llvm.pseudo_probe_desc = !{!47, !48}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "x", scope: !2, file: !3, line: 2, type: !5, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C11, file: !3, producer: "clang version 18.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: None)
+!3 = !DIFile(filename: "file1.c", directory: "/home/", checksumkind: CSK_MD5, checksum: "03dfbda098b1285e8c9837f184747483")
+!4 = !{!0}
+!5 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !6)
+!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!7 = distinct !DICompileUnit(language: DW_LANG_C11, file: !8, producer: "clang version 18.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: None)
+!8 = !DIFile(filename: "file2.c", directory: "/home", checksumkind: CSK_MD5, checksum: "bd15f56a5a8604ec94485c3dbf9d0cdd")
+!9 = !{i32 7, !"Dwarf Version", i32 5}
+!10 = !{i32 2, !"Debug Info Version", i32 3}
+!11 = !{i32 1, !"wchar_size", i32 4}
+!12 = !{i32 8, !"PIC Level", i32 2}
+!13 = !{i32 7, !"PIE Level", i32 2}
+!14 = !{i32 7, !"uwtable", i32 2}
+!15 = !{i32 7, !"frame-pointer", i32 2}
+!16 = !{i32 1, !"EnableSplitLTOUnit", i32 0}
+!17 = !{i32 1, !"ProfileSummary", !18}
+!18 = !{!19, !20, !21, !22, !23, !24, !25, !26, !27, !28}
+!19 = !{!"ProfileFormat", !"SampleProfile"}
+!20 = !{!"TotalCount", i64 9258}
+!21 = !{!"MaxCount", i64 2401}
+!22 = !{!"MaxInternalCount", i64 0}
+!23 = !{!"MaxFunctionCount", i64 2401}
+!24 = !{!"NumCounts", i64 18}
+!25 = !{!"NumFunctions", i64 2}
+!26 = !{!"IsPartialProfile", i64 0}
+!27 = !{!"PartialProfileRatio", double 0.000000e+00}
+!28 = !{!"DetailedSummary", !29}
+!29 = !{!30, !31, !32, !33, !34, !35, !36, !37, !38, !39, !40, !41, !42, !43, !44, !45}
+!30 = !{i32 10000, i64 2401, i32 1}
+!31 = !{i32 100000, i64 2401, i32 1}
+!32 = !{i32 200000, i64 2401, i32 1}
+!33 = !{i32 300000, i64 636, i32 2}
+!34 = !{i32 400000, i64 618, i32 4}
+!35 = !{i32 500000, i64 614, i32 8}
+!36 = !{i32 600000, i64 614, i32 8}
+!37 = !{i32 700000, i64 614, i32 8}
+!38 = !{i32 800000, i64 589, i32 10}
+!39 = !{i32 900000, i64 554, i32 11}
+!40 = !{i32 950000, i64 526, i32 12}
+!41 = !{i32 990000, i64 59, i32 16}
+!42 = !{i32 999000, i64 59, i32 16}
+!43 = !{i32 999900, i64 59, i32 16}
+!44 = !{i32 999990, i64 59, i32 16}
+!45 = !{i32 999999, i64 59, i32 16}
+!46 = !{!"clang version 18.0.0"}
+!47 = !{i64 6699318081062747564, i64 563022570642068, !"foo"}
+!48 = !{i64 -2624081020897602054, i64 1126124211449298, !"main"}
+!49 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 11, type: !50, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !52)
+!50 = !DISubroutineType(types: !51)
+!51 = !{!6}
+!52 = !{!53}
+!53 = !DILocalVariable(name: "i", scope: !54, file: !3, line: 13, type: !6)
+!54 = distinct !DILexicalBlock(scope: !49, file: !3, line: 13, column: 3)
+!55 = !{!"function_entry_count", i64 608}
+!56 = !DILocation(line: 13, column: 11, scope: !54)
+!57 = !DILocation(line: 0, scope: !54)
+!58 = !DILocation(line: 13, column: 18, scope: !59)
+!59 = !DILexicalBlockFile(scope: !60, file: !3, discriminator: 0)
+!60 = distinct !DILexicalBlock(scope: !54, file: !3, line: 13, column: 3)
+!61 = !DILocation(line: 13, column: 3, scope: !62)
+!62 = !DILexicalBlockFile(scope: !54, file: !3, discriminator: 2)
+!63 = !DILocation(line: 14, column: 15, scope: !64)
+!64 = distinct !DILexicalBlock(scope: !60, file: !3, line: 13, column: 40)
+!65 = !DILocation(line: 14, column: 18, scope: !64)
+!66 = !{!67, !67, i64 0}
+!67 = !{!"int", !68, i64 0}
+!68 = !{!"omnipotent char", !69, i64 0}
+!69 = !{!"Simple C/C++ TBAA"}
+!70 = !DILocalVariable(name: "i", arg: 1, scope: !71, file: !3, line: 6, type: !6)
+!71 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 6, type: !72, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !74)
+!72 = !DISubroutineType(types: !73)
+!73 = !{!6, !6, !6}
+!74 = !{!70, !75}
+!75 = !DILocalVariable(name: "p", arg: 2, scope: !71, file: !3, line: 6, type: !6)
+!76 = !DILocation(line: 0, scope: !71, inlinedAt: !77)
+!77 = distinct !DILocation(line: 14, column: 11, scope: !78)
+!78 = !DILexicalBlockFile(scope: !64, file: !3, discriminator: 186646631)
+!79 = !DILocation(line: 7, column: 6, scope: !80, inlinedAt: !77)
+!80 = distinct !DILexicalBlock(scope: !71, file: !3, line: 7, column: 6)
+!81 = !DILocation(line: 7, column: 8, scope: !80, inlinedAt: !77)
+!82 = !DILocation(line: 7, column: 6, scope: !71, inlinedAt: !77)
+!83 = !DILocation(line: 0, scope: !80, inlinedAt: !77)
+!84 = !{!"branch_weights", i64 614}
+!85 = !DILocation(line: 9, column: 1, scope: !71, inlinedAt: !77)
+!86 = !DILocation(line: 14, column: 8, scope: !64)
+!87 = !DILocation(line: 15, column: 15, scope: !64)
+!88 = !DILocation(line: 15, column: 11, scope: !89)
+!89 = !DILexicalBlockFile(scope: !64, file: !3, discriminator: 186646639)
+!90 = !{!"branch_weights", i32 614}
+!91 = !DILocation(line: 15, column: 8, scope: !64)
+!92 = !DILocation(line: 16, column: 9, scope: !93)
+!93 = distinct !DILexicalBlock(scope: !64, file: !3, line: 16, column: 9)
+!94 = !DILocation(line: 16, column: 11, scope: !93)
+!95 = !DILocation(line: 16, column: 9, scope: !64)
+!96 = !{!"branch_weights", i32 0, i32 614}
+!97 = !DILocation(line: 18, column: 15, scope: !64)
+!98 = !DILocation(line: 18, column: 18, scope: !64)
+!99 = !DILocation(line: 0, scope: !71, inlinedAt: !100)
+!100 = distinct !DILocation(line: 18, column: 11, scope: !101)
+!101 = !DILexicalBlockFile(scope: !64, file: !3, discriminator: 186646647)
+!102 = !DILocation(line: 7, column: 6, scope: !80, inlinedAt: !100)
+!103 = !DILocation(line: 7, column: 6, scope: !71, inlinedAt: !100)
+!104 = !DILocation(line: 0, scope: !80, inlinedAt: !100)
+!105 = !DILocation(line: 9, column: 1, scope: !71, inlinedAt: !100)
+!106 = !DILocation(line: 18, column: 8, scope: !64)
+!107 = !DILocation(line: 19, column: 15, scope: !64)
+!108 = !DILocation(line: 19, column: 11, scope: !109)
+!109 = !DILexicalBlockFile(scope: !64, file: !3, discriminator: 186646655)
+!110 = !DILocation(line: 19, column: 8, scope: !64)
+!111 = !DILocation(line: 13, column: 36, scope: !59)
+!112 = !DILocation(line: 13, column: 36, scope: !113)
+!113 = !DILexicalBlockFile(scope: !60, file: !3, discriminator: 6)
+!114 = !DILocation(line: 13, column: 20, scope: !115)
+!115 = !DILexicalBlockFile(scope: !60, file: !3, discriminator: 2)
+!116 = !{!"branch_weights", i32 608, i32 614}
+!117 = distinct !{!117, !118, !119, !120}
+!118 = !DILocation(line: 13, column: 3, scope: !54)
+!119 = !DILocation(line: 20, column: 3, scope: !54)
+!120 = !{!"llvm.loop.mustprogress"}
+!121 = !DILocation(line: 0, scope: !49)
+!122 = !DILocation(line: 22, column: 1, scope: !49)
+!123 = distinct !DISubprogram(name: "bar", scope: !8, file: !8, line: 1, type: !124, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !7, retainedNodes: !126)
+!124 = !DISubroutineType(types: !125)
+!125 = !{!6, !6}
+!126 = !{!127}
+!127 = !DILocalVariable(name: "x", arg: 1, scope: !123, file: !8, line: 1, type: !6)
+!128 = !{!"function_entry_count", i64 2401}
+!129 = !DILocation(line: 0, scope: !123)
+!130 = !DILocation(line: 5, column: 10, scope: !123)
+!131 = !DILocation(line: 5, column: 12, scope: !123)
+!132 = !DILocation(line: 5, column: 3, scope: !123)
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