[llvm] [VectorCombine] foldShuffleOfBinops - support multiple uses of shuffled binops (PR #179429)
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Thu Feb 5 01:10:26 PST 2026
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
index 7967cc7ee..659583a75 100644
--- a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
+++ b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
@@ -2609,14 +2609,14 @@ bool VectorCombine::foldShuffleOfBinops(Instruction &I) {
// When SameBinOp, only count the binop cost once.
InstructionCost LHSCost = TTI.getInstructionCost(LHS, CostKind);
InstructionCost RHSCost = TTI.getInstructionCost(RHS, CostKind);
-
+
InstructionCost OldCost = LHSCost;
if (!SameBinOp) {
OldCost += RHSCost;
}
- OldCost += TTI.getShuffleCost(TargetTransformInfo::SK_PermuteTwoSrc, ShuffleDstTy,
- BinResTy, OldMask, CostKind, 0, nullptr, {LHS, RHS},
- &I);
+ OldCost += TTI.getShuffleCost(TargetTransformInfo::SK_PermuteTwoSrc,
+ ShuffleDstTy, BinResTy, OldMask, CostKind, 0,
+ nullptr, {LHS, RHS}, &I);
// Handle shuffle(binop(shuffle(x),y),binop(z,shuffle(w))) style patterns
// where one use shuffles have gotten split across the binop/cmp. These
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https://github.com/llvm/llvm-project/pull/179429
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