[llvm] [LV] codegen for tail-folded epilogue loop (PR #208764)

[David Sherwood via llvm-commits]

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@@ -8060,6 +8212,15 @@ bool LoopVectorizePass::processLoop(Loop *L) {
 
   // Plan how to best vectorize.
   LVP.plan(UserVF, UserIC);
+  if (EpilogueTailFoldingCM.has_value())
+    if (!LVP.planForEpilogueTF(UserVF, UserIC, EpilogueVectorizationForceVF,
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david-arm wrote:

Do we need to pass in `EpilogueVectorizationForceVF` here? It's a global option that should also be accessible from `planForEpilogueTF` and makes it easier to reuse existing epiloguevf related functions like `hasForcedEpilogueVF`.

https://github.com/llvm/llvm-project/pull/208764