[llvm] [InstCombine] Extend #125676 to handle variable power of 2 (PR #125855)

[Andreas Jonson via llvm-commits]

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@@ -4200,14 +4200,14 @@ Value *InstCombinerImpl::foldXorOfICmps(ICmpInst *LHS, ICmpInst *RHS,
 
     // Fold (icmp eq/ne (X & Pow2), 0) ^ (icmp eq/ne (Y & Pow2), 0) into
     // (icmp eq/ne ((X ^ Y) & Pow2), 0)
-    Value *X, *Y;
-    const APInt *Mask;
+    Value *X, *Y, *Mask;
     if (ICmpInst::isEquality(PredL) && ICmpInst::isEquality(PredR) &&
         LC->isZero() && RC->isZero() && LHS->hasOneUse() && RHS->hasOneUse() &&
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andjo403 wrote:

can it not be beneficial to make the fold if either LHS or RHS have one use? it will result in the same amount of instructions but the other argument will have one less use.

https://github.com/llvm/llvm-project/pull/125855