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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_euclidean_distance_f64.c
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* Description: Euclidean distance between two vectors
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*
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* $Date: 10 August 2022
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* $Revision: V1.10.1
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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) 2010-2021 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/distance_functions.h"
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#include <limits.h>
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#include <math.h>
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/**
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@addtogroup Euclidean
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@{
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*/
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/**
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* @brief Euclidean distance between two vectors
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* @param[in] pA First vector
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* @param[in] pB Second vector
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* @param[in] blockSize vector length
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* @return distance
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*
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*/
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float64_t arm_euclidean_distance_f64(const float64_t *pA,const float64_t *pB, uint32_t blockSize)
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{
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float64_t accum=0.,tmp;
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uint32_t blkCnt;
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#if defined(ARM_MATH_NEON) && defined(__aarch64__)
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float64x2_t accumV,tmpV , pAV ,pBV;
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accumV = vdupq_n_f64(0.0);
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blkCnt = blockSize >> 1U;
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while(blkCnt > 0U)
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{
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pAV = vld1q_f64(pA);
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pBV = vld1q_f64(pB);
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tmpV = vsubq_f64(pAV, pBV);
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accumV = vmlaq_f64(accumV, tmpV, tmpV);
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pA+=2;
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pB+=2;
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blkCnt--;
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}
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accum = vaddvq_f64(accumV);
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blkCnt = blockSize & 1;
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#else
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blkCnt = blockSize;
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#endif
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while(blkCnt > 0)
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{
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tmp = *pA++ - *pB++;
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accum += SQ(tmp);
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blkCnt --;
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}
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tmp = sqrt(accum);
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return(tmp);
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}
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/**
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* @} end of Euclidean group
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*/
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