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159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_braycurtis_distance_f16.c
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* Description: Bray-Curtis distance between two vectors
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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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) 2010-2021 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_f16.h"
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#if defined(ARM_FLOAT16_SUPPORTED)
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#include <limits.h>
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#include <math.h>
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/**
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* @ingroup groupDistance
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*/
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/**
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* @defgroup FloatDist Float Distances
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*
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* Distances between two vectors of float values.
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*/
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/**
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@ingroup FloatDist
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*/
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/**
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@defgroup braycurtis Bray-Curtis distance
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Bray-Curtis distance between two vectors
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*/
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/**
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@addtogroup braycurtis
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@{
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*/
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/**
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* @brief Bray-Curtis 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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#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
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#include "arm_helium_utils.h"
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float16_t arm_braycurtis_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
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{
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_Float16 accumDiff = 0.0f, accumSum = 0.0f;
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uint32_t blkCnt;
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f16x8_t a, b, c, accumDiffV, accumSumV;
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accumDiffV = vdupq_n_f16(0.0f);
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accumSumV = vdupq_n_f16(0.0f);
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blkCnt = blockSize >> 3;
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while (blkCnt > 0) {
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a = vld1q(pA);
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b = vld1q(pB);
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c = vabdq(a, b);
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accumDiffV = vaddq(accumDiffV, c);
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c = vaddq_f16(a, b);
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c = vabsq_f16(c);
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accumSumV = vaddq(accumSumV, c);
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pA += 8;
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pB += 8;
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blkCnt--;
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}
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blkCnt = blockSize & 7;
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if (blkCnt > 0U) {
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mve_pred16_t p0 = vctp16q(blkCnt);
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a = vldrhq_z_f16(pA, p0);
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b = vldrhq_z_f16(pB, p0);
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c = vabdq(a, b);
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accumDiffV = vaddq_m(accumDiffV, accumDiffV, c, p0);
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c = vaddq_f16(a, b);
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c = vabsq_f16(c);
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accumSumV = vaddq_m(accumSumV, accumSumV, c, p0);
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}
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accumDiff = vecAddAcrossF16Mve(accumDiffV);
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accumSum = vecAddAcrossF16Mve(accumSumV);
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/*
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It is assumed that accumSum is not zero. Since it is the sum of several absolute
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values it would imply that all of them are zero. It is very unlikely for long vectors.
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*/
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return (accumDiff / accumSum);
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}
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#else
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float16_t arm_braycurtis_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
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{
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_Float16 accumDiff=0.0f16, accumSum=0.0f16, tmpA, tmpB;
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while(blockSize > 0)
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{
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tmpA = *pA++;
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tmpB = *pB++;
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accumDiff += (_Float16)fabsf((float32_t)((_Float16)tmpA - (_Float16)tmpB));
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accumSum += (_Float16)fabsf((float32_t)((_Float16)tmpA + (_Float16)tmpB));
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blockSize --;
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}
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/*
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It is assumed that accumSum is not zero. Since it is the sum of several absolute
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values it would imply that all of them are zero. It is very unlikely for long vectors.
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*/
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return(accumDiff / accumSum);
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}
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#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
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/**
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* @} end of braycurtis group
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*/
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#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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