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[ThinLTO] Compute synthetic function entry count

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Summary:
This patch computes the synthetic function entry count on the whole
program callgraph (based on module summary) and writes the entry counts
to the summary. After function importing, this count gets attached to
the IR as metadata. Since it adds a new field to the summary, this bumps
up the version.

Reviewers: tejohnson

Subscribers: mehdi_amini, inglorion, llvm-commits

Differential Revision: https://reviews.llvm.org/D43521

llvm-svn: 349076
This commit is contained in:
Easwaran Raman
2018-12-13 19:54:27 +00:00
parent 41c729e78e
commit 5a7056fa03
24 changed files with 293 additions and 34 deletions
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26
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -5247,9 +5247,9 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
}
const uint64_t Version = Record[0];
const bool IsOldProfileFormat = Version == 1;
if (Version < 1 || Version > 5)
if (Version < 1 || Version > 6)
return error("Invalid summary version " + Twine(Version) +
", 1, 2, 3, 4 or 5 expected");
". Version should be in the range [1-6].");
Record.clear();
// Keep around the last seen summary to be used when we see an optional
@@ -5303,6 +5303,9 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
// 1 bit: SkipModuleByDistributedBackend flag.
if (Flags & 0x2)
TheIndex.setSkipModuleByDistributedBackend();
// 1 bit: HasSyntheticEntryCounts flag.
if (Flags & 0x4)
TheIndex.setHasSyntheticEntryCounts();
break;
}
case bitc::FS_VALUE_GUID: { // [valueid, refguid]
@@ -5358,8 +5361,8 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
IsOldProfileFormat, HasProfile, HasRelBF);
setImmutableRefs(Refs, NumImmutableRefs);
auto FS = llvm::make_unique<FunctionSummary>(
Flags, InstCount, getDecodedFFlags(RawFunFlags), std::move(Refs),
std::move(Calls), std::move(PendingTypeTests),
Flags, InstCount, getDecodedFFlags(RawFunFlags), /*EntryCount=*/0,
std::move(Refs), std::move(Calls), std::move(PendingTypeTests),
std::move(PendingTypeTestAssumeVCalls),
std::move(PendingTypeCheckedLoadVCalls),
std::move(PendingTypeTestAssumeConstVCalls),
@@ -5437,18 +5440,25 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
uint64_t RawFlags = Record[2];
unsigned InstCount = Record[3];
uint64_t RawFunFlags = 0;
uint64_t EntryCount = 0;
unsigned NumRefs = Record[4];
unsigned NumImmutableRefs = 0;
int RefListStartIndex = 5;
if (Version >= 4) {
RawFunFlags = Record[4];
NumRefs = Record[5];
RefListStartIndex = 6;
size_t NumRefsIndex = 5;
if (Version >= 5) {
NumImmutableRefs = Record[6];
RefListStartIndex = 7;
if (Version >= 6) {
NumRefsIndex = 6;
EntryCount = Record[5];
RefListStartIndex = 8;
}
NumImmutableRefs = Record[RefListStartIndex - 1];
}
NumRefs = Record[NumRefsIndex];
}
auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
@@ -5464,8 +5474,8 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
ValueInfo VI = getValueInfoFromValueId(ValueID).first;
setImmutableRefs(Refs, NumImmutableRefs);
auto FS = llvm::make_unique<FunctionSummary>(
Flags, InstCount, getDecodedFFlags(RawFunFlags), std::move(Refs),
std::move(Edges), std::move(PendingTypeTests),
Flags, InstCount, getDecodedFFlags(RawFunFlags), EntryCount,
std::move(Refs), std::move(Edges), std::move(PendingTypeTests),
std::move(PendingTypeTestAssumeVCalls),
std::move(PendingTypeCheckedLoadVCalls),
std::move(PendingTypeTestAssumeConstVCalls),