[llvm] [InstCombine] Fold icmp (zext X), (and (trunc Y), Mask) -> icmp X, trunc Y (PR #221189)

[armandeep singh via llvm-commits]

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@@ -5327,6 +5328,36 @@ Instruction *InstCombinerImpl::foldICmpBinOp(ICmpInst &I,
 
   Value *X;
 
+  // Catch the mirrored operand order: icmp Pred (and (trunc Y), Mask), (zext
+  // X). Canonicalization (like ugt -> ult) often swaps operands, pushing the
+  // zext to Operand 1. We need to handle this to avoid missing optimizations.
+  {
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armandeep23947 wrote:

makes sense, moved it to the end.

https://github.com/llvm/llvm-project/pull/221189