[llvm] [VPlan] First step towards VPlan cost modeling (LegacyCM in CostCtx) (PR #92555)

[via llvm-commits]

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@@ -828,6 +841,11 @@ class VPRecipeBase : public ilist_node_with_parent<VPRecipeBase, VPBasicBlock>,
 
   /// Returns the debug location of the recipe.
   DebugLoc getDebugLoc() const { return DL; }
+
+protected:
+  /// Compute the cost of this recipe using the legacy cost model and the
+  /// underlying instructions.
+  InstructionCost computeCost(ElementCount VF, VPCostContext &Ctx) const;
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ayalz wrote:

(Currently non-virtual, as only the base default implementation is provided, to be made virtual later.)

https://github.com/llvm/llvm-project/pull/92555