[llvm] [AArch64][CostModel] Lower cost of dupq (SVE2.1) (PR #144918)

[David Green via llvm-commits]

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@@ -5599,6 +5599,23 @@ AArch64TTIImpl::getShuffleCost(TTI::ShuffleKind Kind, VectorType *DstTy,
     SrcTy = DstTy;
   }
 
+  // Segmented shuffle matching.
+  if ((ST->hasSVE2p1() ||
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davemgreen wrote:

Check !Mask.empty() too, in case it is not passed in.

https://github.com/llvm/llvm-project/pull/144918