[llvm] [InstCombine] Improve handling of `not` and free inversion. (PR #66787)

[via llvm-commits]

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@@ -4410,6 +4410,11 @@ Instruction *InstCombinerImpl::foldNot(BinaryOperator &I) {
   if (Instruction *NewXor = foldNotXor(I, Builder))
     return NewXor;
 
+  // TODO: Could handle multi-use better by checking if all uses of NotOp (other
+  // than I) can be inverted.
+  if (Value *R = getFreeInverted(NotOp, NotOp->hasOneUse(), &Builder))
+    return replaceInstUsesWith(I, R);
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goldsteinn wrote:

Was actually just operand order changes. Dropping `sinkNotIntoXor`.

https://github.com/llvm/llvm-project/pull/66787