[llvm] [VPlan] Implement interleaving as VPlan-to-VPlan transform. (PR #95842)

[Florian Hahn via llvm-commits]

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@@ -2858,42 +2883,56 @@ void VPWidenPointerInductionRecipe::execute(VPTransformState &State) {
 
   auto *IVR = getParent()->getPlan()->getCanonicalIV();
   PHINode *CanonicalIV = cast<PHINode>(State.get(IVR, 0, /*IsScalar*/ true));
-  Type *PhiType = IndDesc.getStep()->getType();
+  unsigned CurrentPart = getUnrollPart();
 
   // Build a pointer phi
   Value *ScalarStartValue = getStartValue()->getLiveInIRValue();
   Type *ScStValueType = ScalarStartValue->getType();
-  PHINode *NewPointerPhi = PHINode::Create(ScStValueType, 2, "pointer.phi",
-                                           CanonicalIV->getIterator());
 
   BasicBlock *VectorPH = State.CFG.getPreheaderBBFor(this);
-  NewPointerPhi->addIncoming(ScalarStartValue, VectorPH);
+  PHINode *NewPointerPhi = nullptr;
+  if (CurrentPart != 0) {
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fhahn wrote:

Done, thanks!

https://github.com/llvm/llvm-project/pull/95842