[llvm] [VPlan] Delay adding canonical IV increment and exit branches. (PR #82270)

[via llvm-commits]

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@@ -7428,6 +7428,14 @@ LoopVectorizationPlanner::executePlan(
       "expanded SCEVs to reuse can only be used during epilogue vectorization");
   (void)IsEpilogueVectorization;
 
+  TailFoldingStyle Style =
+      CM.getTailFoldingStyle(!isIndvarOverflowCheckKnownFalse(&CM, BestVF));
+  // When not folding the tail, we know that the induction increment will not
+  // overflow.
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ayalz wrote:

Otherwise, when folding tail, the induction increment may always overflow? Perhaps consider above isIndvarOverflowCheckKnownFalse()?

https://github.com/llvm/llvm-project/pull/82270