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[Analysis] Avoid repeated hash lookups (NFC) #126465

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Feb 10, 2025
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[Analysis] Avoid repeated hash lookups (NFC) #126465

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8 changes: 3 additions & 5 deletions llvm/include/llvm/Analysis/RegionInfoImpl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -720,16 +720,14 @@ void RegionInfoBase<Tr>::buildRegionsTree(DomTreeNodeT *N, RegionT *region) {
while (BB == region->getExit())
region = region->getParent();

typename BBtoRegionMap::iterator it = BBtoRegion.find(BB);
auto [It, Inserted] = BBtoRegion.try_emplace(BB, region);

// This basic block is a start block of a region. It is already in the
// BBtoRegion relation. Only the child basic blocks have to be updated.
if (it != BBtoRegion.end()) {
RegionT *newRegion = it->second;
if (!Inserted) {
RegionT *newRegion = It->second;
region->addSubRegion(getTopMostParent(newRegion));
region = newRegion;
} else {
BBtoRegion[BB] = region;
}

for (DomTreeNodeBase<BlockT> *C : *N) {
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