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

[Florian Hahn via llvm-commits]

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@@ -1772,23 +1789,31 @@ void VPVectorPointerRecipe ::execute(VPTransformState &State) {
       // RunTimeVF =  VScale * VF.getKnownMinValue()
       // For fixed-width VScale is 1, then RunTimeVF = VF.getKnownMinValue()
       Value *RunTimeVF = getRuntimeVF(Builder, IndexTy, State.VF);
-      // NumElt = -Part * RunTimeVF
+      // NumElt = -CurrentPart * RunTimeVF
       Value *NumElt = Builder.CreateMul(
-          ConstantInt::get(IndexTy, -(int64_t)Part), RunTimeVF);
+          ConstantInt::get(IndexTy, -(int64_t)CurrentPart), RunTimeVF);
       // LastLane = 1 - RunTimeVF
       Value *LastLane =
           Builder.CreateSub(ConstantInt::get(IndexTy, 1), RunTimeVF);
       PartPtr = Builder.CreateGEP(IndexedTy, Ptr, NumElt, "", InBounds);
       PartPtr = Builder.CreateGEP(IndexedTy, PartPtr, LastLane, "", InBounds);
     } else {
-      Value *Increment = createStepForVF(Builder, IndexTy, State.VF, Part);
+      Value *Increment =
+          createStepForVF(Builder, IndexTy, State.VF, CurrentPart);
       PartPtr = Builder.CreateGEP(IndexedTy, Ptr, Increment, "", InBounds);
     }
 
     State.set(this, PartPtr, Part, /*IsScalar*/ true);
   }
 }
 
+unsigned VPVectorPointerRecipe::getUnrollPart() const {
+  return getNumOperands() == 1
+             ? 0
+             : cast<ConstantInt>(getOperand(1)->getLiveInIRValue())
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fhahn wrote:

Renamed to `getUnrollPartOperand` throughout, thanks

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