[llvm] [InstCombine] Fold operation into select, when one operand is zext of select's condition (PR #166816)

[Andreas Jonson via llvm-commits]

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@@ -1758,6 +1758,9 @@ static Value *simplifyOperationIntoSelectOperand(Instruction &I, SelectInst *SI,
                                     m_Specific(Op), m_Value(V))) &&
                isGuaranteedNotToBeUndefOrPoison(V)) {
       // Pass
+    } else if (match(Op, m_ZExt(m_Specific(SI->getCondition())))) {
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andjo403 wrote:

I do not think that it is any case that can happen if the operand is a i1 the select result is also a i1 and will be folded away and it can not be a trunc as it is not possible to trunc a i1 

https://github.com/llvm/llvm-project/pull/166816