[llvm] [InstCombine] Fold zext(and/or/xor(trunc nuw x), y) -> and/or/xor(zext(y), x) (PR #204927)

[Yingwei Zheng via llvm-commits]

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@@ -1692,6 +1692,15 @@ Instruction *InstCombinerImpl::visitZExt(ZExtInst &Zext) {
     return BinaryOperator::CreateAnd(X, ZextC);
   }
 
+  Value *Y;
+  if (match(Src,
+            m_OneUse(m_c_BitwiseLogic(m_NUWTrunc(m_Value(X)), m_Value(Y)))) &&
+      X->getType() == DestTy) {
+    Value *ZextC = Builder.CreateZExt(Y, DestTy);
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dtcxzyw wrote:

Use `ZextY` instead? `ZExtC` means zero extension of a constant...

https://github.com/llvm/llvm-project/pull/204927