[llvm] [AArch64][InstCombine] xor(cmpne) -> cmpeq (PR #207007)

[Matthew Devereau via llvm-commits]

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@@ -2142,10 +2142,43 @@ static std::optional<Instruction *> instCombineSVEDupX(InstCombiner &IC,
   return IC.replaceInstUsesWith(II, Splat);
 }
 
+static std::optional<Instruction *> instCombineXorSVECmpNE(InstCombiner &IC,
+                                                           IntrinsicInst &II) {
+  if (!match(II.getOperand(2), m_Zero()) || !II.hasOneUse())
+    return std::nullopt;
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MDevereau wrote:

Oh right, I'm clearly talking nonsense. The original case for this was only dealing with ptrue so I'd remembered the XOR as always being ptrue when I was writing that. I agree they don't matter.

https://github.com/llvm/llvm-project/pull/207007