text: /*
   * Copyright (C) 2010-2018 Arm Limited or its affiliates. All rights reserved.
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * Licensed under the Apache License, Version 2.0 (the License); you may
   * not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /* ----------------------------------------------------------------------
   * Project:      CMSIS NN Library
   * Title:        arm_nn_add_q7.c
   * Description:  Non saturating addition of elements of a q7 vector.
   *
   * $Date:        20. July 2021
   * $Revision:    V.1.1.1
   *
   * Target Processor:  Cortex-M cores
   *
   * -------------------------------------------------------------------- */
  
  #include "third_party/cmsis/CMSIS/NN/Include/arm_nn_tables.h"
  #include "third_party/cmsis/CMSIS/NN/Include/arm_nnsupportfunctions.h"
  
  /**
   * @ingroup groupSupport
   */
  
  /**
   * @addtogroup NNBasicMath
   * @{
   */
  
  void arm_nn_add_q7(const q7_t *input, q31_t *output, uint32_t block_size)
  {
      uint32_t block_count;
      q31_t result = 0;
  #if defined(ARM_MATH_DSP) && !defined(ARM_MATH_MVEI)
      /* Loop unrolling: Compute 4 outputs at a time */
      block_count = block_size >> 2U;
  
      while (block_count > 0U)
      {
          const int32_t mult_q15x2 = (1UL << 16) | 1UL;
          q31_t in_q7x4 = arm_nn_read_q7x4_ia(&input);
          q31_t temp_q15x2 = __SXTAB16(__SXTB16(in_q7x4), __ROR((uint32_t)in_q7x4, 8));
  
          result = __SMLAD(temp_q15x2, mult_q15x2, result);
  
          /* Decrement loop counter */
          block_count--;
      }
  
      /* Loop unrolling: Compute remaining outputs */
      block_count = block_size & 0x3;
  #else
      block_count = block_size;
  #endif
      while (block_count > 0U)
      {
          /* Add and store result in destination buffer. */
          result += *input++;
  
          /* Decrement loop counter */
          block_count--;
      }
  
      *output = result;
  }
  
  /**
   * @} end of NNBasicMath group
   */