================
@@ -6380,7 +6380,71 @@ Instruction
*InstCombinerImpl::foldICmpUsingBoolRange(ICmpInst &I) {
Y->getType()->isIntOrIntVectorTy(1) && Pred == ICmpInst::ICMP_ULE)
return BinaryOperator::CreateOr(Builder.CreateIsNull(X), Y);
+ // icmp eq/ne X, (zext/sext (icmp eq/ne X, C))
+ ICmpInst::Predicate Pred1, Pred2;
const APInt *C;
+ Instruction *ExtI;
+ if (match(&I, m_c_ICmp(Pred1, m_Value(X),
+ m_CombineAnd(m_Instruction(ExtI),
+ m_ZExtOrSExt(m_ICmp(Pred2, m_Deferred(X),
+ m_APInt(C))))))) {
----------------
nikic wrote:
As far as I can tell, nothing here checks that Pred1 and Pred2 are equality
predicates, so all the "else" branches below assuming that "else" is eq/ne are
wrong? I don't see any negative tests for non-equality predicates either.
https://github.com/llvm/llvm-project/pull/65852
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