[llvm] [InstCombine] Fold `(x < y) ? -1 : zext(x != y)` into `u/scmp(x,y)` (PR #101049)

[Yingwei Zheng via llvm-commits]

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@@ -4111,5 +4143,8 @@ Instruction *InstCombinerImpl::visitSelectInst(SelectInst &SI) {
     }
   }
 
+  if (auto *Instruction = foldSelectToCmp(SI))
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dtcxzyw wrote:

It would be better to move this fold before expensive folds above (e.g., line 4066).


https://github.com/llvm/llvm-project/pull/101049