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/* ----------------------------------------------------------------------
* 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
*/
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