if (!attrs)
      return op->emitError(
          "backend_config has no 'attributes' key or the attributes value is "
          "not a dictionary");

    auto calledComputations = op.getCalledComputations();
    if (!calledComputations || calledComputations.size() != 1)
      return op->emitError("expected exactly one called_computation");

    auto decomposition = mlir::cast<FlatSymbolRefAttr>(calledComputations[0]);