[llvm] [LV] Support tail-folded epilogue loops (PR #208764)

[David Sherwood via llvm-commits]

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@@ -5934,6 +6086,22 @@ LoopVectorizationPlanner::computeBestVF() {
   return {BestFactor, &BestPlan};
 }
 
+LoopVectorizationPlanner::LoopVectorizationPlanner(
+    Loop *L, LoopInfo *LI, DominatorTree *DT, const TargetLibraryInfo *TLI,
+    const TargetTransformInfo &TTI, LoopVectorizationLegality *Legal,
+    LoopVectorizationCostModel &CM,
+    std::unique_ptr<LoopVectorizationCostModel> EpilogueTfCM,
+    VFSelectionContext &Config, InterleavedAccessInfo &IAI,
+    PredicatedScalarEvolution &PSE, const LoopVectorizeHints &Hints,
+    OptimizationRemarkEmitter *ORE)
+    : OrigLoop(L), LI(LI), DT(DT), TLI(TLI), TTI(TTI), Legal(Legal), CM(CM),
+      EpilogueTfCM(std::move(EpilogueTfCM)), Config(Config), IAI(IAI), PSE(PSE),
+      Hints(Hints), ORE(ORE) {}
+
+LoopVectorizationPlanner::~LoopVectorizationPlanner() = default;
+
+void LoopVectorizationPlanner::clearEpilogueTfCM() { EpilogueTfCM.reset(); }
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david-arm wrote:

I tried moving this myself to LoopVectorizationPlanner.h and I see that it fails to build due to not being able to see the full LoopVectorizationCostModel type.

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