[llvm] [InstCombine] support trunc condition in foldSelectICmpAndAnd (PR #223132)
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Sat Sep 12 01:45:53 PDT 2026
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/IR/PatternMatch.h llvm/lib/Transforms/InstCombine/InstCombineSelect.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/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
index cdd86306e..a4061bbd6 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
@@ -780,9 +780,8 @@ static Instruction *foldSelectICmpAndAnd(Type *SelType, const Value *Cond,
SelType->getScalarSizeInBits());
auto TValPattern = m_CombineOr(
m_Deferred(X),
- m_LShr(m_Deferred(X),
- m_Value(Z, m_SpecificInt_ICMP_ForbidPoison(CmpInst::ICMP_ULT,
- BitWidth))));
+ m_LShr(m_Deferred(X), m_Value(Z, m_SpecificInt_ICMP_ForbidPoison(
+ CmpInst::ICMP_ULT, BitWidth))));
if (!match(A, TValPattern)) {
std::swap(X, Y);
``````````
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https://github.com/llvm/llvm-project/pull/223132
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