[llvm] [VPlan] Extract reverse operation for reverse accesses (PR #146525)

[Mel Chen via llvm-commits]

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@@ -7004,6 +7004,28 @@ static bool planContainsAdditionalSimplifications(VPlan &Plan,
               WidenCmp->getPredicate() != cast<CmpInst>(UI)->getPredicate())
             return true;
         }
+
+        if (auto *MemR = dyn_cast<VPWidenMemoryRecipe>(&R)) {
+          bool IsReverse = CostCtx.CM.getWideningDecision(UI, VF) ==
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Mel-Chen wrote:

Relate to separating the reverse mask from reverse access recipes. Redirect to https://github.com/llvm/llvm-project/pull/155579/files#r2303439125

https://github.com/llvm/llvm-project/pull/146525