[llvm] [LoongArch] Make rotl/rotr custom for lsx/lasx (PR #161154)

[via llvm-commits]

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@@ -827,6 +834,59 @@ SDValue LoongArchTargetLowering::lowerPREFETCH(SDValue Op,
   return Op;
 }
 
+SDValue LoongArchTargetLowering::lowerRotate(SDValue Op,
+                                             SelectionDAG &DAG) const {
+  MVT VT = Op.getSimpleValueType();
+  if (!VT.isVector())
+    return Op;
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zhaoqi5 wrote:

Use an assert is better.

https://github.com/llvm/llvm-project/pull/161154