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[CSSPGO][llvm-profgen] Change sample count of dangling probe in llvm-profgen

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Differential Revision: https://reviews.llvm.org/D96811
This commit is contained in:
wlei 2021-02-16 12:55:06 -08:00
parent 8bf2f5ca50
commit 0965edc9f1
4 changed files with 24 additions and 7 deletions
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7
include/llvm/ProfileData/SampleProf.h
View File

@ -552,6 +552,13 @@ public:
FName, Num, Weight);
}
sampleprof_error addBodySamplesForProbe(uint32_t Index, uint64_t Num,
uint64_t Weight = 1) {
SampleRecord S;
S.addSamples(Num, Weight);
return BodySamples[LineLocation(Index, 0)].merge(S, Weight);
}
/// Return the number of samples collected at the given location.
/// Each location is specified by \p LineOffset and \p Discriminator.
/// If the location is not found in profile, return error.

6
test/tools/llvm-profgen/inline-cs-pseudoprobe.test
View File

@ -9,10 +9,10 @@
; CHECK-NEXT: 6: 15
; CHECK-NEXT: 8: 14 bar:14
; CHECK-NEXT: !CFGChecksum: 138950591924
; CHECK-NEXT:[main:2 @ foo:8 @ bar]:56:14
; CHECK-NEXT:[main:2 @ foo:8 @ bar]:28:14
; CHECK-NEXT: 1: 14
; CHECK-NEXT: 2: 14
; CHECK-NEXT: 3: 14
; CHECK-NEXT: 2: 18446744073709551615
; CHECK-NEXT: 3: 18446744073709551615
; CHECK-NEXT: 4: 14
; CHECK-NEXT: !CFGChecksum: 72617220756

6
test/tools/llvm-profgen/noinline-cs-pseudoprobe.test
View File

@ -8,10 +8,10 @@
; CHECK-NEXT: 6: 15
; CHECK-NEXT: 8: 15 bar:15
; CHECK-NEXT: !CFGChecksum: 138950591924
; CHECK-NEXT:[main:2 @ foo:8 @ bar]:60:15
; CHECK-NEXT:[main:2 @ foo:8 @ bar]:30:15
; CHECK-NEXT: 1: 15
; CHECK-NEXT: 2: 15
; CHECK-NEXT: 3: 15
; CHECK-NEXT: 2: 18446744073709551615
; CHECK-NEXT: 3: 18446744073709551615
; CHECK-NEXT: 4: 15
; CHECK-NEXT: !CFGChecksum: 72617220756

12
tools/llvm-profgen/ProfileGenerator.cpp
View File

@ -492,7 +492,17 @@ void PseudoProbeCSProfileGenerator::populateBodySamplesWithProbes(
FunctionSamples &FunctionProfile =
getFunctionProfileForLeafProbe(ContextStrStack, Probe, Binary);
FunctionProfile.addBodySamples(Probe->Index, 0, Count);
// Use InvalidProbeCount(UINT64_MAX) to mark sample count for a dangling
// probe. Dangling probes are the probes associated to an empty block. With
// this place holder, sample count on dangling probe will not be trusted by
// the compiler and it will rely on the counts inference algorithm to get
// the probe a reasonable count.
if (Probe->isDangling()) {
FunctionProfile.addBodySamplesForProbe(
Probe->Index, FunctionSamples::InvalidProbeCount);
continue;
}
FunctionProfile.addBodySamplesForProbe(Probe->Index, Count);
FunctionProfile.addTotalSamples(Count);
if (Probe->isEntry()) {
FunctionProfile.addHeadSamples(Count);