You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
|
|
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_chebyshev_distance_f64.c
|
|
* Description: Chebyshev distance between two vectors
|
|
*
|
|
* $Date: 10 August 2022
|
|
* $Revision: V1.10.1
|
|
*
|
|
* Target Processor: Cortex-M and Cortex-A cores
|
|
* -------------------------------------------------------------------- */
|
|
/*
|
|
* Copyright (C) 2010-2021 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/distance_functions.h"
|
|
#include <limits.h>
|
|
#include <math.h>
|
|
|
|
|
|
/**
|
|
@addtogroup Chebyshev
|
|
@{
|
|
*/
|
|
|
|
|
|
/**
|
|
* @brief Chebyshev distance between two vectors
|
|
* @param[in] pA First vector
|
|
* @param[in] pB Second vector
|
|
* @param[in] blockSize vector length
|
|
* @return distance
|
|
*
|
|
*/
|
|
float64_t arm_chebyshev_distance_f64(const float64_t *pA,const float64_t *pB, uint32_t blockSize)
|
|
{
|
|
|
|
float64_t diff=0., maxVal,tmpA, tmpB;
|
|
uint32_t blkCnt;
|
|
maxVal = F64_MIN;
|
|
#if defined(ARM_MATH_NEON) && defined(__aarch64__)
|
|
float64x2_t diffV , tmpAV , tmpBV , maxValV ;
|
|
maxValV = vdupq_n_f64(maxVal);
|
|
blkCnt = blockSize >> 1U ;
|
|
while(blkCnt > 0U)
|
|
{
|
|
tmpAV = vld1q_f64(pA);
|
|
tmpBV = vld1q_f64(pB);
|
|
diffV = vabsq_f64((vsubq_f64(tmpAV, tmpBV)));
|
|
maxValV = vmaxq_f64(maxValV, diffV);
|
|
pA+=2;
|
|
pB+=2;
|
|
blkCnt--;
|
|
}
|
|
maxVal =vgetq_lane_f64(maxValV, 0);
|
|
if(maxVal < vgetq_lane_f64(maxValV, 1))
|
|
{
|
|
maxVal = vgetq_lane_f64(maxValV, 1);
|
|
}
|
|
blkCnt = blockSize & 1;
|
|
|
|
|
|
#else
|
|
blkCnt = blockSize;
|
|
#endif
|
|
|
|
while(blkCnt > 0)
|
|
{
|
|
tmpA = *pA++;
|
|
tmpB = *pB++;
|
|
diff = fabs(tmpA - tmpB);
|
|
if (diff > maxVal)
|
|
{
|
|
maxVal = diff;
|
|
}
|
|
blkCnt --;
|
|
}
|
|
|
|
return(maxVal);
|
|
}
|
|
|
|
/**
|
|
* @} end of Chebyshev group
|
|
*/
|