return;
  }

  // Try to use the recorded cost if any.
  if (cost_recorder_ != nullptr) {
    const auto op_key_attr =
        op->getAttrOfType<mlir::IntegerAttr>(kOpKeyAttrName);
    if (op_key_attr) {
      cost_map_[op] = cost_recorder_->GetCost(op_key_attr.getInt());
      return;
    }
  }

  // These ops are cheap regardless of their input sizes.
  //