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Compute summary before calling extractProfTotalWeight 

extractProfTotalWeight checks if the profile type is sample profile, but
before that we have to ensure that summary is available. Also expanded
the unittest to test the case where there is no summar

Differential Revision: https://reviews.llvm.org/D28708

llvm-svn: 291982
This commit is contained in:
Easwaran Raman 2017-01-14 00:32:37 +00:00
parent b66164ca34
commit a7bdb8a513
3 changed files with 66 additions and 35 deletions
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2
llvm/include/llvm/Analysis/ProfileSummaryInfo.h
View File

@ -45,7 +45,7 @@ class ProfileSummaryInfo {
private:
Module &M;
std::unique_ptr<ProfileSummary> Summary;
void computeSummary();
bool computeSummary();
void computeThresholds();
// Count thresholds to answer isHotCount and isColdCount queries.
Optional<uint64_t> HotCountThreshold, ColdCountThreshold;

22
llvm/lib/Analysis/ProfileSummaryInfo.cpp
View File

@ -56,22 +56,23 @@ static uint64_t getMinCountForPercentile(SummaryEntryVector &DS,
// The profile summary metadata may be attached either by the frontend or by
// any backend passes (IR level instrumentation, for example). This method
// checks if the Summary is null and if so checks if the summary metadata is now
// available in the module and parses it to get the Summary object.
void ProfileSummaryInfo::computeSummary() {
// available in the module and parses it to get the Summary object. Returns true
// if a valid Summary is available.
bool ProfileSummaryInfo::computeSummary() {
if (Summary)
return;
return true;
auto *SummaryMD = M.getProfileSummary();
if (!SummaryMD)
return;
return false;
Summary.reset(ProfileSummary::getFromMD(SummaryMD));
return true;
}
/// Returns true if the function's entry is hot. If it returns false, it
/// either means it is not hot or it is unknown whether it is hot or not (for
/// example, no profile data is available).
bool ProfileSummaryInfo::isFunctionEntryHot(const Function *F) {
computeSummary();
if (!F || !Summary)
if (!F || !computeSummary())
return false;
auto FunctionCount = F->getEntryCount();
// FIXME: The heuristic used below for determining hotness is based on
@ -84,13 +85,12 @@ bool ProfileSummaryInfo::isFunctionEntryHot(const Function *F) {
/// either means it is not cold or it is unknown whether it is cold or not (for
/// example, no profile data is available).
bool ProfileSummaryInfo::isFunctionEntryCold(const Function *F) {
computeSummary();
if (!F)
return false;
if (F->hasFnAttribute(Attribute::Cold)) {
return true;
}
if (!Summary)
if (!computeSummary())
return false;
auto FunctionCount = F->getEntryCount();
// FIXME: The heuristic used below for determining coldness is based on
@ -101,9 +101,7 @@ bool ProfileSummaryInfo::isFunctionEntryCold(const Function *F) {
/// Compute the hot and cold thresholds.
void ProfileSummaryInfo::computeThresholds() {
if (!Summary)
computeSummary();
if (!Summary)
if (!computeSummary())
return;
auto &DetailedSummary = Summary->getDetailedSummary();
HotCountThreshold =
@ -148,6 +146,8 @@ bool ProfileSummaryInfo::isColdBB(const BasicBlock *B,
bool ProfileSummaryInfo::extractProfTotalWeight(const Instruction *I,
uint64_t &TotalCount) {
if (!computeSummary())
return false;
// Use profile weight on metadata only for sample profiling where block counts
// could differ from the count of an instruction within the block.
if (Summary.get()->getKind() != ProfileSummary::PSK_Sample)

49
llvm/unittests/Analysis/ProfileSummaryInfoTest.cpp
View File

@ -45,8 +45,8 @@ protected:
BPI.reset(new BranchProbabilityInfo(F, *LI));
return BlockFrequencyInfo(F, *BPI, *LI);
}
std::unique_ptr<Module> makeLLVMModule(StringRef ProfKind) {
const char *ModuleStrig =
std::unique_ptr<Module> makeLLVMModule(const char *ProfKind = nullptr) {
const char *ModuleString =
"define i32 @g(i32 %x) !prof !21 {{\n"
" ret i32 0\n"
"}\n"
@ -67,11 +67,12 @@ protected:
" %y2 = phi i32 [0, %bb1], [1, %bb2] \n"
" ret i32 %y2\n"
"}\n"
"!llvm.module.flags = !{{!1}"
"!20 = !{{!\"function_entry_count\", i64 400}"
"!21 = !{{!\"function_entry_count\", i64 1}"
"!22 = !{{!\"function_entry_count\", i64 100}"
"!23 = !{{!\"branch_weights\", i32 64, i32 4}"
"!20 = !{{!\"function_entry_count\", i64 400}\n"
"!21 = !{{!\"function_entry_count\", i64 1}\n"
"!22 = !{{!\"function_entry_count\", i64 100}\n"
"!23 = !{{!\"branch_weights\", i32 64, i32 4}\n"
"{0}";
const char *SummaryString = "!llvm.module.flags = !{{!1}"
"!1 = !{{i32 1, !\"ProfileSummary\", !2}"
"!2 = !{{!3, !4, !5, !6, !7, !8, !9, !10}"
"!3 = !{{!\"ProfileFormat\", !\"{0}\"}"
@ -87,11 +88,41 @@ protected:
"!13 = !{{i32 999000, i64 300, i32 3}"
"!14 = !{{i32 999999, i64 5, i32 10}";
SMDiagnostic Err;
return parseAssemblyString(StringRef(formatv(ModuleStrig, ProfKind)), Err,
C);
if (ProfKind)
return parseAssemblyString(
formatv(ModuleString, formatv(SummaryString, ProfKind).str()).str(),
Err, C);
else
return parseAssemblyString(formatv(ModuleString, "").str(), Err, C);
}
};
TEST_F(ProfileSummaryInfoTest, TestNoProfile) {
auto M = makeLLVMModule(/*ProfKind=*/nullptr);
Function *F = M->getFunction("f");
ProfileSummaryInfo PSI = buildPSI(M.get());
// In the absence of profiles, is{Hot|Cold}X methods should always return
// false.
EXPECT_FALSE(PSI.isHotCount(1000));
EXPECT_FALSE(PSI.isHotCount(0));
EXPECT_FALSE(PSI.isColdCount(1000));
EXPECT_FALSE(PSI.isColdCount(0));
EXPECT_FALSE(PSI.isFunctionEntryHot(F));
EXPECT_FALSE(PSI.isFunctionEntryCold(F));
BasicBlock &BB0 = F->getEntryBlock();
BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0);
BlockFrequencyInfo BFI = buildBFI(*F);
EXPECT_FALSE(PSI.isHotBB(&BB0, &BFI));
EXPECT_FALSE(PSI.isColdBB(&BB0, &BFI));
CallSite CS1(BB1->getFirstNonPHI());
EXPECT_FALSE(PSI.isHotCallSite(CS1, &BFI));
EXPECT_FALSE(PSI.isColdCallSite(CS1, &BFI));
}
TEST_F(ProfileSummaryInfoTest, TestCommon) {
auto M = makeLLVMModule("InstrProf");
Function *F = M->getFunction("f");