[llvm] WIP:[LV] Support strided memory accesses with a stride of -1 (PR #128718)

[Mel Chen via llvm-commits]

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@@ -1308,6 +1309,18 @@ class LoopVectorizationCostModel {
            (SI && TTI.isLegalMaskedScatter(Ty, Align));
   }
 
+  /// Returns true if the target machine can represent \p V as a strided load
+  /// or store operation.
+  bool isLegalStridedLoadStore(Value *V, ElementCount VF) {
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Mel-Chen wrote:

I copy the function name from TTI function. Do you have any recommended names?

https://github.com/llvm/llvm-project/pull/128718