[llvm] [VPlan] Directly unroll VectorPointerRecipe (PR #168886)

[Ramkumar Ramachandra via llvm-commits]

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@@ -297,6 +297,22 @@ void UnrollState::unrollRecipeByUF(VPRecipeBase &R) {
       Copy->setOperand(1, getValueForPart(Op, Part));
       continue;
     }
+    if (auto *VPR = dyn_cast<VPVectorPointerRecipe>(&R)) {
+      VPBuilder Builder(VPR);
+      auto *Prev = cast<VPVectorPointerRecipe>(getValueForPart(VPR, Part - 1))
+                       ->getOperand(1);
+      VPValue *Increment = &Plan.getVF();
+      Type *IncTy = TypeInfo.inferScalarType(Increment);
+      Increment = Builder.createScalarZExtOrTrunc(
+          Increment, TypeInfo.inferScalarType(Prev), IncTy,
+          DebugLoc::getCompilerGenerated());
+      VPIRFlags Flags = VPIRFlags::WrapFlagsTy(true, true);
+      VPInstruction *Add = Builder.createNaryOp(
+          Instruction::Add, {Prev, Increment}, Flags, VPR->getDebugLoc());
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artagnon wrote:

Oops, misread your initial suggestion: thanks for following up!

https://github.com/llvm/llvm-project/pull/168886