[llvm] [VPlan] Unroll VPReplicateRecipe by VF. (PR #142433)

[David Sherwood via llvm-commits]

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@@ -7291,6 +7291,7 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
   // cost model is complete for better cost estimates.
   VPlanTransforms::runPass(VPlanTransforms::unrollByUF, BestVPlan, BestUF,
                            OrigLoop->getHeader()->getContext());
+  VPlanTransforms::runPass(VPlanTransforms::unrollByVF, BestVPlan, BestVF);
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david-arm wrote:

Is the general idea that by unrolling the replicate recipes we open up more folding/dce opportunities within vplan, to reduce the burden on dce/instcombine?

https://github.com/llvm/llvm-project/pull/142433