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llvm-reduce: Avoid reallocating per chunk iteration #135029

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Apr 9, 2025
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llvm-reduce: Avoid reallocating per chunk iteration #135029

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8 changes: 6 additions & 2 deletions llvm/tools/llvm-reduce/deltas/Delta.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -244,16 +244,20 @@ void llvm::runDeltaPass(TestRunner &Test, const DeltaPass &Pass) {
ChunkThreadPoolPtr =
std::make_unique<DefaultThreadPool>(hardware_concurrency(NumJobs));

SmallString<0> OriginalBC;
DenseSet<Chunk> UninterestingChunks;
UninterestingChunks.reserve(Targets);

bool FoundAtLeastOneNewUninterestingChunkWithCurrentGranularity;
do {
FoundAtLeastOneNewUninterestingChunkWithCurrentGranularity = false;

DenseSet<Chunk> UninterestingChunks;
UninterestingChunks.clear();

// When running with more than one thread, serialize the original bitcode
// to OriginalBC.
SmallString<0> OriginalBC;
if (NumJobs > 1) {
OriginalBC.clear();
raw_svector_ostream BCOS(OriginalBC);
Test.getProgram().writeBitcode(BCOS);
}
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