[llvm] [InstCombine] Use known bits to simplify mask in foldSelectICmpAnd (PR #128741)

[Julian Nagele via llvm-commits]

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@@ -148,11 +149,13 @@ static Value *foldSelectICmpAnd(SelectInst &Sel, ICmpInst *Cmp,
   } else if (auto Res = decomposeBitTestICmp(Cmp->getOperand(0),
                                              Cmp->getOperand(1), Pred)) {
     assert(ICmpInst::isEquality(Res->Pred) && "Not equality test?");
-    if (!Res->Mask.isPowerOf2())
+    AndMask = Res->Mask;
+    V = Res->X;
+    KnownBits Known = computeKnownBits(V, 0, SQ.getWithInstruction(Cmp));
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juliannagele wrote:

thanks, done

https://github.com/llvm/llvm-project/pull/128741