[llvm] [VPlan] Implement interleaving as VPlan-to-VPlan transform. (PR #95842)

[Florian Hahn via llvm-commits]

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@@ -7392,6 +7392,8 @@ LoopVectorizationPlanner::executePlan(
       "expanded SCEVs to reuse can only be used during epilogue vectorization");
   (void)IsEpilogueVectorization;
 
+  VPlanTransforms::interleaveByUF(
+      BestVPlan, BestUF, OrigLoop->getHeader()->getModule()->getContext());
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fhahn wrote:

Sounds good for a follow-up, this will help improve cost modeling once we completed the transition to the VPlan-based cost model.

Added TODO.

https://github.com/llvm/llvm-project/pull/95842