[llvm] [AArch64] optimise SVE cmp intrinsics with no active lanes (PR #104779)

[via llvm-commits]

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@@ -1160,6 +1160,10 @@ static std::optional<Instruction *> instCombineSVECmpNE(InstCombiner &IC,
                                                         IntrinsicInst &II) {
   LLVMContext &Ctx = II.getContext();
 
+  // Replace by zero constant when all lanes are inactive
+  if (auto II_NA = instCombineSVENoActiveUnaryZero(IC, II))
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Lukacma wrote:

Okay I will try coming up with better naming scheme for this. It cannot be just `instCombineSVENoActiveLanes ` as there are multiple different things that can happen when all lanes are inactive, but using it as a base can work.

https://github.com/llvm/llvm-project/pull/104779