[llvm] [RFC][LV] VPlan-based cost model (PR #67647)

[Renato Golin via llvm-commits]

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@@ -370,6 +388,25 @@ class LoopVectorizationPlanner {
   void adjustRecipesForReductions(VPBasicBlock *LatchVPBB, VPlanPtr &Plan,
                                   VPRecipeBuilder &RecipeBuilder,
                                   ElementCount MinVF);
+
+  /// Returns true when Factor A is more profitable than Factor B.
+  bool isMoreProfitable(const VectorizationFactor &A,
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rengolin wrote:

I'd have guessed this is part of the cost model, not the planner.

https://github.com/llvm/llvm-project/pull/67647