// for all the subgraphs (and their alternatives).
  while (!all_subgraphs->empty()) {
    func::CallOp current_subgraph =
        llvm::cast<func::CallOp>(all_subgraphs->front());
    all_subgraphs->remove(current_subgraph);
    ProcessSubgraph(current_subgraph, all_subgraphs);
  }

  // Make decisions given the "outputs" and the populated dp table.