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[InstrProfiling] Improve compile time when there is no work

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When there are no uses of profiling intrinsics in a module, and there's
no coverage data to lower, InstrProfiling has no work to do.

llvm-svn: 323574
This commit is contained in:
Vedant Kumar 2018-01-26 23:54:24 +00:00
parent 5db11e3181
commit 1ee511c19c
1 changed files with 21 additions and 2 deletions
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23
llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
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@ -430,7 +430,27 @@ void InstrProfiling::promoteCounterLoadStores(Function *F) {
}
}
/// Check if the module contains uses of any profiling intrinsics.
static bool containsProfilingIntrinsics(Module &M) {
if (auto *F = M.getFunction(
Intrinsic::getName(llvm::Intrinsic::instrprof_increment)))
return !F->use_empty();
if (auto *F = M.getFunction(
Intrinsic::getName(llvm::Intrinsic::instrprof_increment_step)))
return !F->use_empty();
if (auto *F = M.getFunction(
Intrinsic::getName(llvm::Intrinsic::instrprof_value_profile)))
return !F->use_empty();
return false;
}
bool InstrProfiling::run(Module &M, const TargetLibraryInfo &TLI) {
// Improve compile time by avoiding linear scans when there is no work.
GlobalVariable *CoverageNamesVar =
M.getNamedGlobal(getCoverageUnusedNamesVarName());
if (!containsProfilingIntrinsics(M) && !CoverageNamesVar)
return false;
bool MadeChange = false;
this->M = &M;
@ -464,8 +484,7 @@ bool InstrProfiling::run(Module &M, const TargetLibraryInfo &TLI) {
for (Function &F : M)
MadeChange |= lowerIntrinsics(&F);
if (GlobalVariable *CoverageNamesVar =
M.getNamedGlobal(getCoverageUnusedNamesVarName())) {
if (CoverageNamesVar) {
lowerCoverageData(CoverageNamesVar);
MadeChange = true;
}