[llvm] [InstCombine] Drop samesign in `foldLogOpOfMaskedICmps` (PR #125829)

[Yingwei Zheng via llvm-commits]

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@@ -610,8 +610,11 @@ static Value *foldLogOpOfMaskedICmps(Value *LHS, Value *RHS, bool IsAnd,
       APInt NewMask = *ConstB & *ConstD;
       if (NewMask == *ConstB)
         return LHS;
-      if (NewMask == *ConstD)
+      if (NewMask == *ConstD) {
+        if (IsLogical)
+          cast<ICmpInst>(RHS)->setSameSign(false);
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dtcxzyw wrote:

Do you mean `trunc X to i1`?


https://github.com/llvm/llvm-project/pull/125829