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[IR] Avoid repeated hash lookups (NFC) #112469

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Oct 16, 2024
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[IR] Avoid repeated hash lookups (NFC) #112469

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8 changes: 3 additions & 5 deletions llvm/lib/IR/LegacyPassManager.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -104,15 +104,13 @@ void PMDataManager::emitInstrCountChangedRemark(
[&FunctionToInstrCount](Function &MaybeChangedFn) {
// Update the total module count.
unsigned FnSize = MaybeChangedFn.getInstructionCount();
auto It = FunctionToInstrCount.find(MaybeChangedFn.getName());

// If we created a new function, then we need to add it to the map and
// say that it changed from 0 instructions to FnSize.
if (It == FunctionToInstrCount.end()) {
FunctionToInstrCount[MaybeChangedFn.getName()] =
std::pair<unsigned, unsigned>(0, FnSize);
auto [It, Inserted] = FunctionToInstrCount.try_emplace(
MaybeChangedFn.getName(), 0, FnSize);
if (Inserted)
return;
}
// Insert the new function size into the second member of the pair. This
// tells us whether or not this function changed in size.
It->second.second = FnSize;
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