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

[via llvm-commits]

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@@ -730,6 +731,89 @@ void VPRegionBlock::execute(VPTransformState *State) {
   State->Instance.reset();
 }
 
+static InstructionCost computeCostForRecipe(VPRecipeBase *R, ElementCount VF,
+                                            VPCostContext &Ctx) {
+  if (auto *S = dyn_cast<VPSingleDefRecipe>(R)) {
+    auto *UI = dyn_cast_or_null<Instruction>(S->getUnderlyingValue());
+    if (UI && Ctx.skipCostComputation(UI))
+      return 0;
+  }
+
+  InstructionCost RecipeCost = R->computeCost(VF, Ctx);
+  if (ForceTargetInstructionCost.getNumOccurrences() > 0 &&
+      RecipeCost.isValid())
+    RecipeCost = InstructionCost(ForceTargetInstructionCost);
+
+  LLVM_DEBUG({
+    dbgs() << "Cost of " << RecipeCost << " for VF " << VF << ": ";
+    R->dump();
+  });
+  return RecipeCost;
+}
+
+InstructionCost VPBasicBlock::computeCost(ElementCount VF, VPCostContext &Ctx) {
+  InstructionCost Cost = 0;
+  for (VPRecipeBase &R : *this)
+    Cost += computeCostForRecipe(&R, VF, Ctx);
+  return Cost;
+}
+
+InstructionCost VPRegionBlock::computeCost(ElementCount VF,
+                                           VPCostContext &Ctx) {
+  InstructionCost Cost = 0;
+  if (!isReplicator()) {
+    for (VPBlockBase *Block : vp_depth_first_shallow(getEntry()))
+      Cost += Block->computeCost(VF, Ctx);
+    return Cost;
+  }
+
+  // Compute the cost of a replicate region. Replicating isn't supported for
+  // scalable vectors, return an invalid cost for them.
+  if (VF.isScalable())
+    return InstructionCost::getInvalid();
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ayalz wrote:

Worth leaving behind a TODO?

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