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Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_f16.c
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246
Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_f16.c
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_max_f16.c
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* Description: Maximum value of a floating-point vector
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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/statistics_functions_f16.h"
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#if defined(ARM_FLOAT16_SUPPORTED)
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#if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE)
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#include <limits.h>
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#endif
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/**
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@ingroup groupStats
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*/
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/**
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@addtogroup Max
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@{
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*/
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/**
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@brief Maximum value of a floating-point vector.
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@param[in] pSrc points to the input vector
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@param[in] blockSize number of samples in input vector
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@param[out] pResult maximum value returned here
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@param[out] pIndex index of maximum value returned here
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@return none
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*/
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#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
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void arm_max_f16(
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const float16_t * pSrc,
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uint32_t blockSize,
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float16_t * pResult,
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uint32_t * pIndex)
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{
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int32_t blkCnt;
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f16x8_t vecSrc;
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f16x8_t curExtremValVec = vdupq_n_f16(F16_MIN);
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float16_t maxValue = F16_MIN;
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uint32_t idx = blockSize;
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uint16x8_t indexVec;
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uint16x8_t curExtremIdxVec;
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uint32_t curIdx = 0;
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mve_pred16_t p0;
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float16_t tmp;
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indexVec = vidupq_wb_u16(&curIdx, 1);
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curExtremIdxVec = vdupq_n_u16(0);
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/* Compute 4 outputs at a time */
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blkCnt = blockSize >> 3;
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while (blkCnt > 0)
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{
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vecSrc = vldrhq_f16(pSrc);
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/*
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* Get current max per lane and current index per lane
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* when a max is selected
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*/
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p0 = vcmpgeq(vecSrc, curExtremValVec);
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curExtremValVec = vpselq(vecSrc, curExtremValVec, p0);
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curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0);
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indexVec = vidupq_wb_u16(&curIdx, 1);
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pSrc += 8;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/*
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* Get max value across the vector
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*/
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maxValue = vmaxnmvq(maxValue, curExtremValVec);
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/*
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* set index for lower values to max possible index
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*/
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p0 = vcmpgeq(curExtremValVec, maxValue);
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indexVec = vpselq(curExtremIdxVec, vdupq_n_u16(blockSize), p0);
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/*
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* Get min index which is thus for a max value
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*/
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idx = vminvq(idx, indexVec);
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/* Tail */
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blkCnt = blockSize & 7;
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while (blkCnt > 0)
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{
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/* Initialize tmp to the next consecutive values one by one */
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tmp = *pSrc++;
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/* compare for the maximum value */
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if ((_Float16)maxValue < (_Float16)tmp)
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{
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/* Update the maximum value and it's index */
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maxValue = tmp;
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idx = blockSize - blkCnt;
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}
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/* Decrement loop counter */
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blkCnt--;
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}
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/*
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* Save result
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*/
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*pIndex = idx;
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*pResult = maxValue;
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}
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#else
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void arm_max_f16(
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const float16_t * pSrc,
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uint32_t blockSize,
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float16_t * pResult,
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uint32_t * pIndex)
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{
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float16_t maxVal, out; /* Temporary variables to store the output value. */
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uint32_t blkCnt, outIndex; /* Loop counter */
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#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
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uint32_t index; /* index of maximum value */
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#endif
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/* Initialise index value to zero. */
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outIndex = 0U;
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/* Load first input value that act as reference value for comparision */
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out = *pSrc++;
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#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
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/* Initialise index of maximum value. */
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index = 0U;
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = (blockSize - 1U) >> 2U;
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while (blkCnt > 0U)
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{
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/* Initialize maxVal to next consecutive values one by one */
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maxVal = *pSrc++;
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/* compare for the maximum value */
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if ((_Float16)out < (_Float16)maxVal)
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{
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/* Update the maximum value and it's index */
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out = maxVal;
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outIndex = index + 1U;
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}
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maxVal = *pSrc++;
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if ((_Float16)out < (_Float16)maxVal)
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{
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out = maxVal;
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outIndex = index + 2U;
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}
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maxVal = *pSrc++;
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if ((_Float16)out < (_Float16)maxVal)
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{
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out = maxVal;
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outIndex = index + 3U;
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}
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maxVal = *pSrc++;
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if ((_Float16)out < (_Float16)maxVal)
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{
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out = maxVal;
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outIndex = index + 4U;
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}
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index += 4U;
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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 - 1U) % 4U;
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#else
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/* Initialize blkCnt with number of samples */
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blkCnt = (blockSize - 1U);
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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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/* Initialize maxVal to the next consecutive values one by one */
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maxVal = *pSrc++;
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/* compare for the maximum value */
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if ((_Float16)out < (_Float16)maxVal)
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{
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/* Update the maximum value and it's index */
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out = maxVal;
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outIndex = blockSize - blkCnt;
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}
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Store the maximum value and it's index into destination pointers */
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*pResult = out;
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*pIndex = outIndex;
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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 Max group
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*/
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#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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