[llvm] [RISCV] Fold vector shift of sext/zext to widening multiply (PR #121563)

[Philip Reames via llvm-commits]

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@@ -17341,6 +17341,85 @@ static SDValue combineScalarCTPOPToVCPOP(SDNode *N, SelectionDAG &DAG,
   return DAG.getZExtOrTrunc(Pop, DL, VT);
 }
 
+static SDValue combineSHL(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,
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preames wrote:

The naming convention in this file would have this routine named performSHLCombine

https://github.com/llvm/llvm-project/pull/121563