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[Transforms] Avoid repeated hash lookups (NFC) #129359

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Mar 1, 2025
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[Transforms] Avoid repeated hash lookups (NFC) #129359

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7 changes: 3 additions & 4 deletions llvm/include/llvm/Transforms/Utils/SampleProfileLoaderBaseImpl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -646,14 +646,13 @@ void SampleProfileLoaderBaseImpl<BT>::findEquivalenceClasses(FunctionT &F) {
BasicBlockT *BB1 = &BB;

// Compute BB1's equivalence class once.
if (EquivalenceClass.count(BB1)) {
// By default, blocks are in their own equivalence class.
auto [It, Inserted] = EquivalenceClass.try_emplace(BB1, BB1);
if (!Inserted) {
LLVM_DEBUG(printBlockEquivalence(dbgs(), BB1));
continue;
}

// By default, blocks are in their own equivalence class.
EquivalenceClass[BB1] = BB1;

// Traverse all the blocks dominated by BB1. We are looking for
// every basic block BB2 such that:
//
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