text: // Copyright 2020 Google LLC
  //
  // This source code is licensed under the BSD-style license found in the
  // LICENSE file in the root directory of this source tree.
  
  #include <math.h>
  #include <stddef.h>
  #include <stdint.h>
  
  #include <xnnpack.h>
  #include <xnnpack/log.h>
  #include <xnnpack/params.h>
  #include <xnnpack/subgraph.h>
  
  
  enum xnn_status xnn_define_squared_difference(
    xnn_subgraph_t subgraph,
    uint32_t input1_id,
    uint32_t input2_id,
    uint32_t output_id,
    uint32_t flags)
  {
    if ((xnn_params.init_flags & XNN_INIT_FLAG_XNNPACK) == 0) {
      xnn_log_error("failed to define %s operator: XNNPACK is not initialized",
        xnn_node_type_to_string(xnn_node_type_squared_difference));
      return xnn_status_uninitialized;
    }
  
    if (input1_id >= subgraph->num_values) {
      xnn_log_error(
        "failed to define %s operator with the first input ID #%" PRIu32 ": invalid Value ID",
        xnn_node_type_to_string(xnn_node_type_squared_difference), input1_id);
      return xnn_status_invalid_parameter;
    }
  
    if (input2_id >= subgraph->num_values) {
      xnn_log_error(
        "failed to define %s operator with the second input ID #%" PRIu32 ": invalid Value ID",
        xnn_node_type_to_string(xnn_node_type_squared_difference), input2_id);
      return xnn_status_invalid_parameter;
    }
  
    if (output_id >= subgraph->num_values) {
      xnn_log_error(
        "failed to define %s operator with output ID #%" PRIu32 ": invalid Value ID",
        xnn_node_type_to_string(xnn_node_type_squared_difference), output_id);
      return xnn_status_invalid_parameter;
    }
  
    struct xnn_node* node = xnn_subgraph_new_node(subgraph);
    if (node == NULL) {
      return xnn_status_out_of_memory;
    }
  
    node->type = xnn_node_type_squared_difference;
    node->num_inputs = 2;
    node->inputs[0] = input1_id;
    node->inputs[1] = input2_id;
    node->num_outputs = 1;
    node->outputs[0] = output_id;
    node->flags = flags;
  
    return xnn_status_success;
  }
  