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

[Florian Hahn via llvm-commits]

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@@ -973,6 +973,93 @@ void VPWidenRecipe::execute(VPTransformState &State) {
 #endif
 }
 
+InstructionCost VPWidenRecipe::computeCost(ElementCount VF,
+                                           VPCostContext &Ctx) {
+  VPWidenRecipe *Cur = this;
+  // Check if the recipe is used in a reduction chain. Let the legacy cost-model
+  // handle that case for now.
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fhahn wrote:

Code removed, as reduction chain costs are pre-computed

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