[llvm] [InstCombine] Fold redundant select guards for ctpop (PR #195443)
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Sat May 2 04:42:26 PDT 2026
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp --diff_from_common_commit
``````````
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
index c87d9bfa8..59c3ebef7 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
@@ -4400,7 +4400,8 @@ Instruction *InstCombinerImpl::visitSelectInst(SelectInst &SI) {
Value *CtpopCmpLHS, *CtpopCmpRHS;
unsigned CtpopBitWidth = SelType->getScalarSizeInBits();
if (match(FalseVal, m_Intrinsic<Intrinsic::ctpop>(m_Value(X))) &&
- match(CondVal, m_ICmp(CtpopPred, m_Value(CtpopCmpLHS), m_Value(CtpopCmpRHS)))) {
+ match(CondVal,
+ m_ICmp(CtpopPred, m_Value(CtpopCmpLHS), m_Value(CtpopCmpRHS)))) {
if (CtpopCmpLHS == X && CtpopPred == ICmpInst::ICMP_ULT &&
match(CtpopCmpRHS, m_SpecificInt(2)) && TrueVal == X)
return replaceInstUsesWith(SI, FalseVal);
``````````
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https://github.com/llvm/llvm-project/pull/195443
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