[llvm] [VPlan] Materialize Build(Struct)Vectors for VPReplicateRecipes. (NFCI) (PR #151487)

[Florian Hahn via llvm-commits]

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@@ -3278,6 +3278,52 @@ void VPlanTransforms::materializeBackedgeTakenCount(VPlan &Plan,
   BTC->replaceAllUsesWith(TCMO);
 }
 
+void VPlanTransforms::materializeBuildVectors(VPlan &Plan) {
+  if (Plan.hasScalarVFOnly())
+    return;
+
+  VPTypeAnalysis TypeInfo(Plan);
+  VPRegionBlock *LoopRegion = Plan.getVectorLoopRegion();
+  auto VPBBsOutsideLoopRegion = VPBlockUtils::blocksOnly<VPBasicBlock>(
+      vp_depth_first_shallow(Plan.getEntry()));
+  auto VPBBsInsideLoopRegion = VPBlockUtils::blocksOnly<VPBasicBlock>(
+      vp_depth_first_shallow(LoopRegion->getEntry()));
+  // Materialize Build(Struct)Vector for all replicating VPReplicateRecipes,
+  // excluding ones in replicate regions. Those are not materialized explicitly
+  // yet. Those vector users are still handled in VPReplicateRegion::execute(),
+  // via shouldPack().
+  // TODO: materialize build vectors for replicating recipes in replicating
+  // regions.
+  // TODO: materialize build vectors for VPInstructions.
+  for (VPBasicBlock *VPBB :
+       concat<VPBasicBlock *>(VPBBsOutsideLoopRegion, VPBBsInsideLoopRegion)) {
+    for (VPRecipeBase &R : make_early_inc_range(*VPBB)) {
+      auto *RepR = dyn_cast<VPReplicateRecipe>(&R);
+      auto UsesVectorOrInsideReplicateRegions = [RepR, LoopRegion](VPUser *U) {
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fhahn wrote:

Updated, thanks

https://github.com/llvm/llvm-project/pull/151487