[llvm] [RISCV] Match strided vector bases in RISCVGatherScatterLowering (PR #93972)

[Philip Reames via llvm-commits]

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@@ -349,6 +349,22 @@ RISCVGatherScatterLowering::determineBaseAndStride(Instruction *Ptr,
 
   SmallVector<Value *, 2> Ops(GEP->operands());
 
+  // If the base pointer is a vector, check if it's strided.
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preames wrote:

Please move this down into the  if (!ScalarBase) case below, we'd rather find a splatable base if possible.

Please perform the operand check before doing the recursive call.  The unwind from the recursion may generate code.  

https://github.com/llvm/llvm-project/pull/93972