[llvm] [InstCombine] Limit canonicalization of extractelement(cast) to constant index or same basic block. (PR #166227)
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Mon Nov 3 12:17:33 PST 2025
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git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp --diff_from_common_commit
``````````
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
index 5af7c4caa..44c3863dd 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
@@ -588,9 +588,9 @@ Instruction *InstCombinerImpl::visitExtractElementInst(ExtractElementInst &EI) {
// Canonicalize extractelement(cast) -> cast(extractelement).
// Bitcasts can change the number of vector elements, and they cost
// nothing.
- if (CI->hasOneUse() && (CI->getOpcode() != Instruction::BitCast)){
+ if (CI->hasOneUse() && (CI->getOpcode() != Instruction::BitCast)) {
Instruction *U = cast<Instruction>(*CI->user_begin());
- if (U->getParent() == CI->getParent() || isa<ConstantInt>(Index)){
+ if (U->getParent() == CI->getParent() || isa<ConstantInt>(Index)) {
Value *EE = Builder.CreateExtractElement(CI->getOperand(0), Index);
return CastInst::Create(CI->getOpcode(), EE, EI.getType());
}
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https://github.com/llvm/llvm-project/pull/166227
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