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125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_logsumexp_f32.c
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* Description: LogSumExp
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*
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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) 2010-2019 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 "arm_math.h"
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#include <limits.h>
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#include <math.h>
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/**
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* @addtogroup groupStats
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* @{
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*/
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/**
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* @brief Entropy
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*
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* Distribution may contain 0 probabilities with Neon version.
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* Result will be right but some exception flags will be set.
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*
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* @param[in] *pSrcA points to an array of input values.
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* @param[in] blockSize number of samples in the input array.
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* @return Entropy -Sum(p ln p)
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*
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*/
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#if defined(ARM_MATH_NEON)
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#include "NEMath.h"
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float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
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{
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const float32_t *pIn;
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uint32_t blkCnt;
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float32_t accum, p;
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float32x4_t accumV;
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float32x2_t accumV2;
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float32x4_t tmpV, tmpV2;
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pIn = pSrcA;
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accum = 0.0;
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accumV = vdupq_n_f32(0.0);
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blkCnt = blockSize >> 2;
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while(blkCnt > 0)
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{
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tmpV = vld1q_f32(pIn);
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pIn += 4;
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tmpV2 = vlogq_f32(tmpV);
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accumV = vmlaq_f32(accumV, tmpV, tmpV2);
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blkCnt--;
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}
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accumV2 = vpadd_f32(vget_low_f32(accumV),vget_high_f32(accumV));
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accum = accumV2[0] + accumV2[1];
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blkCnt = blockSize & 3;
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while(blkCnt > 0)
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{
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p = *pIn++;
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accum += p * log(p);
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blkCnt--;
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}
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return(-accum);
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}
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#else
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float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
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{
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const float32_t *pIn;
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uint32_t blkCnt;
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float32_t accum, p;
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pIn = pSrcA;
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blkCnt = blockSize;
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accum = 0.0;
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while(blkCnt > 0)
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{
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p = *pIn++;
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accum += p * log(p);
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blkCnt--;
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}
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return(-accum);
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}
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#endif
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/**
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* @} end of groupStats group
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*/
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