[llvm] [VPlan] Materialize constant vector trip counts before final opts. (PR #142309)

[Florian Hahn via llvm-commits]

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@@ -7329,6 +7329,7 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
                              BestVPlan, BestVF);
   VPlanTransforms::optimizeForVFAndUF(BestVPlan, BestVF, BestUF, PSE);
   VPlanTransforms::simplifyRecipes(BestVPlan, *Legal->getWidestInductionType());
+  VPlanTransforms::removeBranchOnConst(BestVPlan);
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fhahn wrote:

Yep, this is to make use of the additional opportunities introduced after materializaing the vector trip count.

https://github.com/llvm/llvm-project/pull/142309