[llvm] [InstCombine] Fold select pattern with sub and negation to abs intrinsic (PR #156246)
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Sun Aug 31 07:11:57 PDT 2025
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
index d75e34f90..794db87be 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
@@ -1157,9 +1157,9 @@ static Value *foldAbsDiff(ICmpInst *Cmp, Value *TVal, Value *FVal,
// Recognize the pattern where we have sub, icmp, neg(sub), select
if (Pred == CmpInst::ICMP_SGT &&
match(TI, m_Sub(m_Specific(A), m_Specific(B))) &&
- match(FI, m_Neg(m_Specific(TI))) &&
- TI->hasNoSignedWrap()) {
- return Builder.CreateBinaryIntrinsic(Intrinsic::abs, TI, Builder.getFalse());
+ match(FI, m_Neg(m_Specific(TI))) && TI->hasNoSignedWrap()) {
+ return Builder.CreateBinaryIntrinsic(Intrinsic::abs, TI,
+ Builder.getFalse());
}
return nullptr;
``````````
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https://github.com/llvm/llvm-project/pull/156246
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