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

[Sander de Smalen via llvm-commits]

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@@ -30005,8 +29981,14 @@ SDValue AArch64TargetLowering::LowerFixedLengthVECTOR_SHUFFLEToSVE(
           DAG, VT, DAG.getNode(Opc, DL, ContainerVT, Op1, Op1));
     }
 
-    if (Subtarget->hasSVE2p1()) {
-      if (std::optional<unsigned> Lane = isDUPQMask(ShuffleMask, VT)) {
+    if (Subtarget->hasSVE2p1() || Subtarget->hasSME2p1()) {
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sdesmalen-arm wrote:

Does this require an extra RUN line for the original test?

Also, for it to be able to use laneq with SME2p1, it must be in streaming mode, so you'll need to add a check for `isSVEorStreamingSVEAvailable`

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