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[TableGen] Avoid repeated hash lookups (NFC) #126464

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Merged
merged 1 commit into from
Feb 10, 2025
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[TableGen] Avoid repeated hash lookups (NFC) #126464

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15 changes: 4 additions & 11 deletions clang/utils/TableGen/MveEmitter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1629,17 +1629,10 @@ void EmitterBase::EmitBuiltinCG(raw_ostream &OS) {
for (const auto &OI : kv.second)
key.push_back(OI.ParamValues[i]);

auto Found = ParamNumberMap.find(key);
if (Found != ParamNumberMap.end()) {
// Yes, an existing parameter variable can be reused for this.
ParamNumbers.push_back(Found->second);
continue;
}

// No, we need a new parameter variable.
int ExistingIndex = ParamNumberMap.size();
ParamNumberMap[key] = ExistingIndex;
ParamNumbers.push_back(ExistingIndex);
// Obtain a new parameter variable if we don't have one.
int ParamNum =
ParamNumberMap.try_emplace(key, ParamNumberMap.size()).first->second;
ParamNumbers.push_back(ParamNum);
}

// Now we're ready to do the pass 2 code generation, which will emit the
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