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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_mse_q7.c
* Description: Mean square error between two Q7 vectors
*
* $Date: 04 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
*/
/**
@defgroup MSE Mean Square Error
Calculates the mean square error between two vectors.
*/
/**
@addtogroup MSE
@{
*/
/**
@brief Mean square error between two Q7 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] pResult mean square error
@return none
*/
#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
void arm_mse_q7(
const q7_t * pSrcA,
const q7_t * pSrcB,
uint32_t blockSize,
q7_t * pResult)
{
uint32_t blkCnt; /* loop counters */
q7x16_t vecSrcA,vecSrcB;
q31_t sum = 0LL;
/* Compute 16 outputs at a time */
blkCnt = blockSize >> 4U;
while (blkCnt > 0U)
{
vecSrcA = vld1q(pSrcA);
vecSrcB = vld1q(pSrcB);
vecSrcA = vshrq(vecSrcA,1);
vecSrcB = vshrq(vecSrcB,1);
vecSrcA = vqsubq(vecSrcA,vecSrcB);
/*
* sum lanes
*/
sum = vmladavaq(sum, vecSrcA, vecSrcA);
blkCnt--;
pSrcA += 16;
pSrcB += 16;
}
/*
* tail
*/
blkCnt = blockSize & 0xF;
if (blkCnt > 0U)
{
mve_pred16_t p0 = vctp8q(blkCnt);
vecSrcA = vld1q(pSrcA);
vecSrcB = vld1q(pSrcB);
vecSrcA = vshrq(vecSrcA,1);
vecSrcB = vshrq(vecSrcB,1);
vecSrcA = vqsubq(vecSrcA,vecSrcB);
sum = vmladavaq_p(sum, vecSrcA, vecSrcA, p0);
}
*pResult = (q7_t) __SSAT((q15_t) (sum / blockSize)>>5, 8);
}
#else
void arm_mse_q7(
const q7_t * pSrcA,
const q7_t * pSrcB,
uint32_t blockSize,
q7_t * pResult)
{
uint32_t blkCnt; /* Loop counter */
q31_t sum = 0; /* Temporary result storage */
q7_t inA,inB; /* Temporary variable to store input value */
#if defined (ARM_MATH_LOOPUNROLL)
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
inA = *pSrcA++ >> 1;
inB = *pSrcB++ >> 1;
inA = (q7_t) __SSAT((q15_t) inA - (q15_t)inB, 8);
sum += ((q15_t) inA * inA);
inA = *pSrcA++ >> 1;
inB = *pSrcB++ >> 1;
inA = (q7_t) __SSAT((q15_t) inA - (q15_t)inB, 8);
sum += ((q15_t) inA * inA);
inA = *pSrcA++ >> 1;
inB = *pSrcB++ >> 1;
inA = (q7_t) __SSAT((q15_t) inA - (q15_t)inB, 8);
sum += ((q15_t) inA * inA);
inA = *pSrcA++ >> 1;
inB = *pSrcB++ >> 1;
inA = (q7_t) __SSAT((q15_t) inA - (q15_t)inB, 8);
sum += ((q15_t) inA * inA);
/* Decrement loop counter */
blkCnt--;
}
/* Loop unrolling: Compute remaining outputs */
blkCnt = blockSize % 0x4U;
#else
/* Initialize blkCnt with number of samples */
blkCnt = blockSize;
#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
while (blkCnt > 0U)
{
inA = *pSrcA++ >> 1;
inB = *pSrcB++ >> 1;
inA = (q7_t) __SSAT((q15_t) inA - (q15_t)inB, 8);
sum += ((q15_t) inA * inA);
/* Decrement loop counter */
blkCnt--;
}
/* Store result in q7 format */
*pResult = (q7_t) __SSAT((q15_t) (sum / blockSize)>>5, 8);;
}
#endif /* defined(ARM_MATH_MVEI) */
/**
@} end of MSE group
*/
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