[llvm] [VPlan] First step towards VPlan cost modeling. (PR #67934)

[via llvm-commits]

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@@ -7395,6 +7396,177 @@ LoopVectorizationPlanner::plan(ElementCount UserVF, unsigned UserIC) {
   return VF;
 }
 
+static InstructionCost
+computeCostForRecipe(VPRecipeBase *R, ElementCount VF,
+                     SmallPtrSetImpl<Instruction *> &SeenUI,
+                     LoopVectorizationCostModel &CM,
+                     const TargetTransformInfo &TTI, VPCostContext CostCtx) {
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ayalz wrote:

Use the TTI of CostCtx instead of passing it too?

https://github.com/llvm/llvm-project/pull/67934