[llvm] [AArch64][SVE2p1] Allow more uses of mask in performActiveLaneMaskCombine (PR #159360)

[Paul Walker via llvm-commits]

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@@ -18820,32 +18826,39 @@ performActiveLaneMaskCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,
 
   SDValue Idx = N->getOperand(0);
   SDValue TC = N->getOperand(1);
-  EVT OpVT = Idx.getValueType();
-  if (OpVT != MVT::i64) {
+  if (Idx.getValueType() != MVT::i64) {
     Idx = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, Idx);
     TC = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, TC);
   }
 
   // Create the whilelo_x2 intrinsics from each pair of extracts
   EVT ExtVT = Extracts[0]->getValueType(0);
+  EVT DoubleExtVT = ExtVT.getDoubleNumVectorElementsVT(*DAG.getContext());
   auto R =
       DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, {ExtVT, ExtVT}, {ID, Idx, TC});
   DCI.CombineTo(Extracts[0], R.getValue(0));
   DCI.CombineTo(Extracts[1], R.getValue(1));
+  SmallVector<SDValue> Concats = {DAG.getNode(
+      ISD::CONCAT_VECTORS, DL, DoubleExtVT, {R.getValue(0), R.getValue(1)})};
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paulwalker-arm wrote:

Is wrapping the operands in `{}` necessary?



https://github.com/llvm/llvm-project/pull/159360