text: /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_mse_f64.c
   * Description:  Double floating point mean square error
   *
   * $Date:        05 April 2022
   * $Revision:    V1.10.0
   *
   * Target Processor: Cortex-M and Cortex-A cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2022 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.
   */
  
  #include "dsp/statistics_functions.h"
  
  /**
    @ingroup groupStats
   */
  
  /**
    @addtogroup MSE
    @{
   */
  
  /**
    @brief         Mean square error between two double floating point vectors.
    @param[in]     pSrcA       points to the first input vector
    @param[in]     pSrcB       points to the second input vector
    @param[in]     blockSize   number of samples in input vector
    @param[out]    result      mean square error
    @return        none
   */
  
  
  
  
  
  void arm_mse_f64(
      const float64_t * pSrcA,
      const float64_t * pSrcB,
      uint32_t    blockSize,
      float64_t * result)
  
  {
    uint32_t blkCnt;                               /* Loop counter */
    float64_t inA, inB;
    float64_t sum = 0.0;                          /* Temporary return variable */
  #if defined (ARM_MATH_LOOPUNROLL)
    blkCnt = (blockSize) >> 1;
  
   
    while (blkCnt > 0U)
    {
  
  
      inA = *pSrcA++; 
      inB = *pSrcB++;
      inA = inA - inB;
      sum += inA * inA;
  
      inA = *pSrcA++; 
      inB = *pSrcB++;
      inA = inA - inB;
      sum += inA * inA;
  
      /* Decrement loop counter */
      blkCnt--;
    }
  
    
    /* Loop unrolling: Compute remaining outputs */
    blkCnt = (blockSize) & 1;
  #else
    /* Initialize blkCnt with number of samples */
    blkCnt = blockSize;
  #endif
    while (blkCnt > 0U)
    {
      inA = *pSrcA++; 
      inB = *pSrcB++;
      inA = inA - inB;
      sum += inA * inA;
  
      /* Decrement loop counter */
      blkCnt--;
    }
  
    /* Store result in destination buffer */
    *result = sum / blockSize;
  }
  
  
  /**
    @} end of MSE group
   */
  