e20b904721
It's useful if the probe-based build can consume a dwarf based profile(e.g. the profile transition), before there is a conflict for the discriminator, this change tries to mitigate the issue by encoding the dwarf base discriminator into the probe discriminator. As the num of probe id(num of basic block and calls) starts from 1, there are some unused space. We try to reuse some bit of the probe id. The new encode rule is: - Use a bit to [28:28] to indicate whether dwarf base discriminator is encoded.(fortunately we can borrow this bit from the `PseudoProbeType`) - If the bit is set, use [15:3] for probe id, [18:16] for dwarf base discriminator. Otherwise, still use [18:3] for probe id. Note that these doesn't affect the original probe id capacity, we still prioritize probe id encoding, i.e. the base discriminator is not encoded when probe id is bigger than [15:3]. Then adjust `getBaseDiscriminatorFromDiscriminator` to use the base discriminator from the probe discriminator.
72 lines
3.7 KiB
LLVM
72 lines
3.7 KiB
LLVM
; RUN: opt < %s -passes='default<O2>' -debug-info-for-profiling -S | FileCheck %s --check-prefix=DEBUG
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; RUN: opt < %s -passes='default<O2>' -debug-info-for-profiling -pseudo-probe-for-profiling -S | FileCheck %s --check-prefix=PROBE
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; RUN: opt < %s -passes='thinlto-pre-link<O2>' -debug-info-for-profiling -pseudo-probe-for-profiling -S | FileCheck %s --check-prefix=PROBE
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@a = dso_local global i32 0, align 4
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; Function Attrs: uwtable
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define void @_Z3foov(i32 %x) #0 !dbg !4 {
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bb0:
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%cmp = icmp eq i32 %x, 0, !dbg !10
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br i1 %cmp, label %bb1, label %bb2
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bb1:
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; DEBUG: call void @_Z3barv(), !dbg ![[CALL1:[0-9]+]]
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; PROBE: call void @_Z3barv(), !dbg ![[CALL1:[0-9]+]]
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call void @_Z3barv(), !dbg !10
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; DEBUG: call void @_Z3barv(), !dbg ![[CALL2:[0-9]+]]
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; PROBE: call void @_Z3barv(), !dbg ![[CALL2:[0-9]+]]
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call void @_Z3barv(), !dbg !11
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ret void, !dbg !13
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bb2:
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; DEBUG: store i32 8, ptr @a, align 4, !dbg ![[INST:[0-9]+]]
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; PROBE: store i32 8, ptr @a, align 4, !dbg ![[INST:[0-9]+]]
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store i32 8, ptr @a, align 4, !dbg !12
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br label %bb3
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bb3:
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ret void, !dbg !12
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}
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declare void @_Z3barv() #1
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declare void @llvm.lifetime.start.p0(i64, ptr nocapture) nounwind argmemonly
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declare void @llvm.lifetime.end.p0(i64, ptr nocapture) nounwind argmemonly
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attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 250915) (llvm/trunk 251830)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!1 = !DIFile(filename: "c.cc", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.8.0 (trunk 250915) (llvm/trunk 251830)"}
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!10 = !DILocation(line: 4, column: 3, scope: !4)
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!11 = !DILocation(line: 4, column: 9, scope: !4)
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!12 = !DILocation(line: 4, column: 15, scope: !4)
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!13 = !DILocation(line: 5, column: 1, scope: !4)
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; DEBUG: ![[CALL1]] = !DILocation(line: 4, column: 3, scope: ![[CALL1BLOCK:[0-9]+]])
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; DEBUG: ![[CALL1BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 2)
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; DEBUG: ![[CALL2]] = !DILocation(line: 4, column: 9, scope: ![[CALL2BLOCK:[0-9]+]])
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; DEBUG: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 8)
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; DEBUG: ![[INST]] = !DILocation(line: 4, column: 15, scope: ![[INSTBLOCK:[0-9]+]])
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; DEBUG: ![[INSTBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 4)
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; PROBE: ![[CALL1]] = !DILocation(line: 4, column: 3, scope: ![[CALL1BLOCK:[0-9]+]])
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; PROBE: ![[CALL1BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 455147551)
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; PROBE: ![[CALL2]] = !DILocation(line: 4, column: 9, scope: ![[CALL2BLOCK:[0-9]+]])
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; PROBE: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 455344167)
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; PROBE: ![[INST]] = !DILocation(line: 4, column: 15, scope: ![[INSTBLOCK:[0-9]+]])
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; PROBE: ![[INSTBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 4)
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