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[IPO] Avoid repeated hash lookups (NFC) #130389

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Merged
merged 1 commit into from
Mar 8, 2025
+4 −7
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[IPO] Avoid repeated hash lookups (NFC) #130389

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11 changes: 4 additions & 7 deletions llvm/lib/Transforms/IPO/GlobalDCE.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -67,16 +67,13 @@ void GlobalDCEPass::ComputeDependencies(Value *V,
Deps.insert(GV);
} else if (auto *CE = dyn_cast<Constant>(V)) {
// Avoid walking the whole tree of a big ConstantExprs multiple times.
auto Where = ConstantDependenciesCache.find(CE);
if (Where != ConstantDependenciesCache.end()) {
auto const &K = Where->second;
Deps.insert(K.begin(), K.end());
} else {
SmallPtrSetImpl<GlobalValue *> &LocalDeps = ConstantDependenciesCache[CE];
auto [Where, Inserted] = ConstantDependenciesCache.try_emplace(CE);
SmallPtrSetImpl<GlobalValue *> &LocalDeps = Where->second;
if (Inserted) {
for (User *CEUser : CE->users())
ComputeDependencies(CEUser, LocalDeps);
Deps.insert(LocalDeps.begin(), LocalDeps.end());
}
Deps.insert(LocalDeps.begin(), LocalDeps.end());
}
}

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