[llvm] [LV][EVL] Generate negative strided load/store for reversed load/store (PR #123608)

[Pengcheng Wang via llvm-commits]

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@@ -1776,6 +1776,10 @@ class TargetTransformInfo {
   /// otherwise scalar epilogue loop.
   bool preferEpilogueVectorization() const;
 
+  /// Return true if the loop vectorizer prefer strided load/store when
+  /// vectorizing reversed load/store.
+  bool preferStridedLoadStore() const;
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wangpc-pp wrote:

Is that a possible μ-arch? If unit load/store+vrgather can be optimized/fused, why can't we optimize strided load/store as well?

https://github.com/llvm/llvm-project/pull/123608