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

[Florian Hahn via llvm-commits]

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@@ -7820,10 +7847,15 @@ EpilogueVectorizerMainLoop::createEpilogueVectorizedLoopSkeleton(
   // Generate the induction variable.
   EPI.VectorTripCount = getOrCreateVectorTripCount(LoopVectorPreHeader);
 
-  // Skip induction resume value creation here because they will be created in
-  // 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.
+  // Generate VPValues and ResumePhi recipes for inductions in the epilogue loop
+  // to resume from the main loop or bypass it, if there are any wide
+  // inductions. Otherwise it is we only need a resume value for the canonical
+  // induction, which will get created during epilogue skeleton construction.
+  if (any_of(
+          EPI.EpiloguePlan.getVectorLoopRegion()->getEntryBasicBlock()->phis(),
+          IsaPred<VPWidenIntOrFpInductionRecipe,
+                  VPWidenPointerInductionRecipe>))
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fhahn wrote:

Done, thanks

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