================
@@ -6380,7 +6380,56 @@ Instruction
*InstCombinerImpl::foldICmpUsingBoolRange(ICmpInst &I) {
Y->getType()->isIntOrIntVectorTy(1) && Pred == ICmpInst::ICMP_ULE)
return BinaryOperator::CreateOr(Builder.CreateIsNull(X), Y);
+ ICmpInst::Predicate Pred1, Pred2;
const APInt *C;
+ // icmp eq/ne X, (zext (icmp eq/ne X, C))
+ if (match(&I, m_c_ICmp(Pred1, m_Value(X),
+ m_ZExt(m_ICmp(Pred2, m_Deferred(X), m_APInt(C))))) &&
----------------
goldsteinn wrote:
Think it may be worth it to handle `sext` as well. X86 vec compare intrinsics
for example expand to `(sext (icmp))`
Think logic is just about exactly the same but the `C->isOne()` case becomes:
`isZext ? C->isOne() : C->isAllOnes()`
https://github.com/llvm/llvm-project/pull/65852
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