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[Analysis] Avoid repeated hash lookups (NFC) #130236

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Mar 7, 2025
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[Analysis] Avoid repeated hash lookups (NFC) #130236

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5 changes: 3 additions & 2 deletions llvm/include/llvm/Analysis/BlockFrequencyInfoImpl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1571,7 +1571,8 @@ void BlockFrequencyInfoImpl<BT>::initTransitionProbabilities(
SmallPtrSet<const BlockT *, 2> UniqueSuccs;
for (const auto SI : children<const BlockT *>(BB)) {
// Ignore cold blocks
if (!BlockIndex.contains(SI))
auto BlockIndexIt = BlockIndex.find(SI);
if (BlockIndexIt == BlockIndex.end())
continue;
// Ignore parallel edges between BB and SI blocks
if (!UniqueSuccs.insert(SI).second)
Expand All @@ -1583,7 +1584,7 @@ void BlockFrequencyInfoImpl<BT>::initTransitionProbabilities(

auto EdgeProb =
Scaled64::getFraction(EP.getNumerator(), EP.getDenominator());
size_t Dst = BlockIndex.find(SI)->second;
size_t Dst = BlockIndexIt->second;
Succs[Src].push_back(std::make_pair(Dst, EdgeProb));
SumProb[Src] += EdgeProb;
}
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