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

[Florian Hahn 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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fhahn wrote:

The current code just moves the existing logic. Put up https://github.com/llvm/llvm-project/pull/111758 to improve this separately.

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