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[InstCombine] Avoid repeated hash lookups (NFC) #124243

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Merged
merged 1 commit into from
Jan 24, 2025
Merged

[InstCombine] Avoid repeated hash lookups (NFC) #124243

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12 changes: 4 additions & 8 deletions llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3060,14 +3060,10 @@ Instruction *InstCombinerImpl::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
unsigned SrcElemsPerTgtElem = TgtElemBitWidth / SrcElemBitWidth;
assert(SrcElemsPerTgtElem);
BegIdx /= SrcElemsPerTgtElem;
bool BCAlreadyExists = NewBCs.contains(CastSrcTy);
auto *NewBC =
BCAlreadyExists
? NewBCs[CastSrcTy]
: Builder.CreateBitCast(V, CastSrcTy, SVI.getName() + ".bc");
if (!BCAlreadyExists)
NewBCs[CastSrcTy] = NewBC;
auto *Ext = Builder.CreateExtractElement(NewBC, BegIdx,
auto [It, Inserted] = NewBCs.try_emplace(CastSrcTy);
if (Inserted)
It->second = Builder.CreateBitCast(V, CastSrcTy, SVI.getName() + ".bc");
auto *Ext = Builder.CreateExtractElement(It->second, BegIdx,
SVI.getName() + ".extract");
// The shufflevector isn't being replaced: the bitcast that used it
// is. InstCombine will visit the newly-created instructions.
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