[llvm] [VPlan] Update scalar induction resume values in VPlan. (PR #110577)

[Florian Hahn via llvm-commits]

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@@ -7808,6 +7813,27 @@ EpilogueVectorizerMainLoop::createEpilogueVectorizedLoopSkeleton(
   // the second pass for the scalar loop. The induction resume values for the
   // inductions in the epilogue loop are created before executing the plan for
   // the epilogue loop.
+  VPBasicBlock *ScalarPHVPBB = Plan.getScalarPreheader();
+  VPBuilder ScalarPHBuilder(ScalarPHVPBB, ScalarPHVPBB->begin());
+  for (VPRecipeBase &R :
+       Plan.getVectorLoopRegion()->getEntryBasicBlock()->phis()) {
+    // Create induction resume values for both widened pointer and
+    // integer/fp inductions and update the start value of the induction
+    // recipes to use the resume value.
+    PHINode *IndPhi = nullptr;
+    const InductionDescriptor *ID;
+    if (auto *Ind = dyn_cast<VPWidenPointerInductionRecipe>(&R)) {
+      IndPhi = cast<PHINode>(Ind->getUnderlyingValue());
+      ID = &Ind->getInductionDescriptor();
+    } else if (auto *WidenInd = dyn_cast<VPWidenIntOrFpInductionRecipe>(&R)) {
+      IndPhi = WidenInd->getPHINode();
+      ID = &WidenInd->getInductionDescriptor();
+    } else
+      continue;
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fhahn wrote:

Fixed, thanks!

https://github.com/llvm/llvm-project/pull/110577