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[CodeGen] Avoid repeated hash lookups (NFC) #129418

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merged 1 commit into from
Mar 2, 2025
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[CodeGen] Avoid repeated hash lookups (NFC) #129418

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14 changes: 7 additions & 7 deletions llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2054,17 +2054,17 @@ bool AssignmentTrackingLowering::join(
// Exactly one visited pred. Copy the LiveOut from that pred into BB LiveIn.
if (VisitedPreds.size() == 1) {
const BlockInfo &PredLiveOut = LiveOut.find(VisitedPreds[0])->second;
auto CurrentLiveInEntry = LiveIn.find(&BB);

// Check if there isn't an entry, or there is but the LiveIn set has
// changed (expensive check).
if (CurrentLiveInEntry == LiveIn.end())
LiveIn.insert(std::make_pair(&BB, PredLiveOut));
else if (PredLiveOut != CurrentLiveInEntry->second)
auto [CurrentLiveInEntry, Inserted] = LiveIn.try_emplace(&BB, PredLiveOut);
if (Inserted)
return /*Changed*/ true;
if (PredLiveOut != CurrentLiveInEntry->second) {
CurrentLiveInEntry->second = PredLiveOut;
else
return /*Changed*/ false;
return /*Changed*/ true;
return /*Changed*/ true;
}
return /*Changed*/ false;
}

// More than one pred. Join LiveOuts of blocks 1 and 2.
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