[llvm] [VPlan] Add transformation to narrow interleave groups. (PR #106441)

[via llvm-commits]

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@@ -7725,6 +7725,7 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
   VPlanTransforms::unrollByUF(BestVPlan, BestUF,
                               OrigLoop->getHeader()->getContext());
   VPlanTransforms::optimizeForVFAndUF(BestVPlan, BestVF, BestUF, PSE);
+  VPlanTransforms::narrowInterleaveGroups(BestVPlan, BestVF);
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ayalz wrote:

This transform relies on a single VF, but is independent of UF, right? Can it be applied earlier, during optimization of VPlans rather than execution of BestPlan, possibly involving cloning VPlans that span a range of VF's.

https://github.com/llvm/llvm-project/pull/106441