177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mse_q31.c
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* Description: Mean square error between two Q31 vectors
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*
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* $Date: 04 April 2022
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* $Revision: V1.10.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2022 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dsp/statistics_functions.h"
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/**
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@ingroup groupStats
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*/
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/**
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@addtogroup MSE
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@{
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*/
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/**
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@brief Mean square error between two Q31 vectors.
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@param[in] pSrcA points to the first input vector
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@param[in] pSrcB points to the second input vector
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@param[in] blockSize number of samples in input vector
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@param[out] pResult mean square error
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@return none
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*/
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#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
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void arm_mse_q31(
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const q31_t * pSrcA,
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const q31_t * pSrcB,
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uint32_t blockSize,
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q31_t * pResult)
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{
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uint32_t blkCnt; /* loop counters */
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q31x4_t vecSrcA,vecSrcB;
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q63_t sum = 0LL;
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/* Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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while (blkCnt > 0U)
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{
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vecSrcA = vld1q(pSrcA);
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vecSrcB = vld1q(pSrcB);
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vecSrcA = vshrq(vecSrcA,1);
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vecSrcB = vshrq(vecSrcB,1);
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vecSrcA = vqsubq(vecSrcA,vecSrcB);
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/*
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* sum lanes
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*/
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sum = vrmlaldavhaq(sum, vecSrcA, vecSrcA);
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blkCnt--;
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pSrcA += 4;
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pSrcB += 4;
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}
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/*
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* tail
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*/
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blkCnt = blockSize & 3;
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if (blkCnt > 0U)
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{
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mve_pred16_t p0 = vctp32q(blkCnt);
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vecSrcA = vld1q(pSrcA);
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vecSrcB = vld1q(pSrcB);
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vecSrcA = vshrq(vecSrcA,1);
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vecSrcB = vshrq(vecSrcB,1);
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vecSrcA = vqsubq(vecSrcA,vecSrcB);
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sum = vrmlaldavhaq_p(sum, vecSrcA, vecSrcA, p0);
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}
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*pResult = (q31_t) ((sum / blockSize)>>21);
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}
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#else
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void arm_mse_q31(
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const q31_t * pSrcA,
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const q31_t * pSrcB,
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uint32_t blockSize,
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q31_t * pResult)
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{
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uint32_t blkCnt; /* Loop counter */
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q63_t sum = 0; /* Temporary result storage */
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q31_t inA32,inB32; /* Temporary variable to store packed input value */
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#if defined (ARM_MATH_LOOPUNROLL)
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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while (blkCnt > 0U)
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{
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inA32 = *pSrcA++ >> 1;
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inB32 = *pSrcB++ >> 1;
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inA32 = __QSUB(inA32, inB32);
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sum += ((q63_t) inA32 * inA32) >> 14U;
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inA32 = *pSrcA++ >> 1;
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inB32 = *pSrcB++ >> 1;
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inA32 = __QSUB(inA32, inB32);
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sum += ((q63_t) inA32 * inA32) >> 14U;
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inA32 = *pSrcA++ >> 1;
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inB32 = *pSrcB++ >> 1;
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inA32 = __QSUB(inA32, inB32);
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sum += ((q63_t) inA32 * inA32) >> 14U;
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inA32 = *pSrcA++ >> 1;
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inB32 = *pSrcB++ >> 1;
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inA32 = __QSUB(inA32, inB32);
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sum += ((q63_t) inA32 * inA32) >> 14U;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Loop unrolling: Compute remaining outputs */
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blkCnt = blockSize % 0x4U;
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#else
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/* Initialize blkCnt with number of samples */
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blkCnt = blockSize;
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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while (blkCnt > 0U)
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{
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inA32 = *pSrcA++ >> 1;
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inB32 = *pSrcB++ >> 1;
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inA32 = __QSUB(inA32, inB32);
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sum += ((q63_t) inA32 * inA32) >> 14U;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Store result in q31 format */
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*pResult = (q31_t) ((sum / blockSize)>>15);
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}
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#endif /* defined(ARM_MATH_MVEI) */
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/**
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@} end of MSE group
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*/
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