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

Florian Hahn via llvm-commits llvm-commits at lists.llvm.org
Sat Aug 9 13:21:51 PDT 2025


================
@@ -3176,6 +3176,53 @@ void VPlanTransforms::materializeVectorTripCount(
     Plan.getVectorTripCount().setUnderlyingValue(NewC->getValue());
 }
 
+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 unrolled explicitly yet.
+  for (VPBasicBlock *VPBB :
+       concat<VPBasicBlock *>(VPBBsOutsideLoopRegion, VPBBsInsideLoopRegion)) {
+    for (VPRecipeBase &R : make_early_inc_range(*VPBB)) {
+      auto *RepR = dyn_cast<VPReplicateRecipe>(&R);
+      if (!RepR || RepR->isSingleScalar())
+        continue;
+      VPInstruction *BuildVector = nullptr;
+      for (VPUser *U : to_vector(RepR->users())) {
+        VPRegionBlock *ParentRegion =
+            cast<VPRecipeBase>(U)->getParent()->getParent();
+        if (U->usesScalars(RepR) && ParentRegion == LoopRegion)
----------------
fhahn wrote:

Added above ,thanks

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


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