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295 lines
14 KiB
C
295 lines
14 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_absmax_q7.c
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* Description: Maximum value of absolute values of a Q7 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.h"
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/**
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@ingroup groupStats
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*/
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/**
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@addtogroup AbsMax
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@{
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*/
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/**
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@brief Maximum value of absolute values of a Q7 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_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
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#include <stdint.h>
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#include "arm_helium_utils.h"
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#define MAX_BLKSZ_S8 (UINT8_MAX+1)
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static void arm_small_blk_absmax_q7(
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const q7_t * pSrc,
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uint16_t blockSize,
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q7_t * pResult,
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uint32_t * pIndex)
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{
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int32_t blkCnt; /* loop counters */
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q7x16_t extremValVec = vdupq_n_s8(Q7_ABSMIN);
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q7_t maxValue = Q7_ABSMIN;
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uint8x16_t indexVec;
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uint8x16_t extremIdxVec;
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mve_pred16_t p0;
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uint8_t extremIdxArr[16];
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indexVec = vidupq_u8(0U, 1);
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blkCnt = blockSize;
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do {
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mve_pred16_t p = vctp8q(blkCnt);
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q7x16_t extremIdxVal = vld1q_z_s8(pSrc, p);
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extremIdxVal = vqabsq(extremIdxVal);
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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_m(extremIdxVal, extremValVec, p);
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extremValVec = vorrq_m(extremValVec, extremIdxVal, extremIdxVal, p0);
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/* store per-lane extrema indexes */
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vst1q_p_u8(extremIdxArr, indexVec, p0);
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indexVec += 16;
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pSrc += 16;
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blkCnt -= 16;
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}
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while (blkCnt > 0);
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/* Get max value across the vector */
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maxValue = vmaxvq(maxValue, extremValVec);
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/* set index for lower values to max possible index */
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p0 = vcmpgeq(extremValVec, maxValue);
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extremIdxVec = vld1q_u8(extremIdxArr);
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indexVec = vpselq(extremIdxVec, vdupq_n_u8(blockSize - 1), p0);
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*pIndex = vminvq_u8(blockSize - 1, indexVec);
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*pResult = maxValue;
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}
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void arm_absmax_q7(
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const q7_t * pSrc,
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uint32_t blockSize,
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q7_t * pResult,
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uint32_t * pIndex)
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{
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int32_t totalSize = blockSize;
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if (totalSize <= MAX_BLKSZ_S8)
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{
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arm_small_blk_absmax_q7(pSrc, blockSize, pResult, pIndex);
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}
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else
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{
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uint32_t curIdx = 0;
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q7_t curBlkExtr = Q7_MIN;
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uint32_t curBlkPos = 0;
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uint32_t curBlkIdx = 0;
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/*
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* process blocks of 255 elts
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*/
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while (totalSize >= MAX_BLKSZ_S8)
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{
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const q7_t *curSrc = pSrc;
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arm_small_blk_absmax_q7(curSrc, MAX_BLKSZ_S8, pResult, pIndex);
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if (*pResult > curBlkExtr)
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{
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/*
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* update partial extrema
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*/
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curBlkExtr = *pResult;
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curBlkPos = *pIndex;
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curBlkIdx = curIdx;
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}
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curIdx++;
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pSrc += MAX_BLKSZ_S8;
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totalSize -= MAX_BLKSZ_S8;
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}
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/*
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* remainder
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*/
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arm_small_blk_absmax_q7(pSrc, totalSize, pResult, pIndex);
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if (*pResult > curBlkExtr)
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{
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curBlkExtr = *pResult;
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curBlkPos = *pIndex;
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curBlkIdx = curIdx;
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}
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*pIndex = curBlkIdx * MAX_BLKSZ_S8 + curBlkPos;
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*pResult = curBlkExtr;
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}
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}
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#else
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#if defined(ARM_MATH_DSP)
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void arm_absmax_q7(
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const q7_t * pSrc,
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uint32_t blockSize,
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q7_t * pResult,
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uint32_t * pIndex)
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{
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q7_t cur_absmax, out; /* Temporary variables to store the output value. */\
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uint32_t blkCnt, outIndex; /* Loop counter */ \
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uint32_t index; /* index of maximum value */ \
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\
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/* Initialize 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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out = (out > 0) ? out : (q7_t)__QSUB8(0, out); \
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/* Initialize index of extrema value. */ \
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index = 0U; \
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\
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/* Loop unrolling: Compute 4 outputs at a time */ \
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blkCnt = (blockSize - 1U) >> 2U; \
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\
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while (blkCnt > 0U) \
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{ \
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/* Initialize cur_absmax to next consecutive values one by one */ \
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cur_absmax = *pSrc++; \
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cur_absmax = (cur_absmax > 0) ? cur_absmax : (q7_t)__QSUB8(0, cur_absmax); \
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/* compare for the extrema value */ \
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if (cur_absmax > out) \
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{ \
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/* Update the extrema value and it's index */ \
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out = cur_absmax; \
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outIndex = index + 1U; \
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} \
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\
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cur_absmax = *pSrc++; \
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cur_absmax = (cur_absmax > 0) ? cur_absmax : (q7_t)__QSUB8(0, cur_absmax); \
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if (cur_absmax > out) \
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{ \
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out = cur_absmax; \
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outIndex = index + 2U; \
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} \
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\
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cur_absmax = *pSrc++; \
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cur_absmax = (cur_absmax > 0) ? cur_absmax : (q7_t)__QSUB8(0, cur_absmax); \
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if (cur_absmax > out) \
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{ \
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out = cur_absmax; \
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outIndex = index + 3U; \
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} \
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\
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cur_absmax = *pSrc++; \
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cur_absmax = (cur_absmax > 0) ? cur_absmax : (q7_t)__QSUB8(0, cur_absmax); \
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if (cur_absmax > out) \
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{ \
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out = cur_absmax; \
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outIndex = index + 4U; \
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} \
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\
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index += 4U; \
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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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/* Loop unrolling: Compute remaining outputs */ \
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blkCnt = (blockSize - 1U) % 4U; \
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\
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\
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while (blkCnt > 0U) \
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{ \
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cur_absmax = *pSrc++; \
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cur_absmax = (cur_absmax > 0) ? cur_absmax : (q7_t)__QSUB8(0, cur_absmax); \
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if (cur_absmax > out) \
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{ \
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out = cur_absmax; \
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outIndex = blockSize - blkCnt; \
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} \
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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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/* Store the extrema 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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#else
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void arm_absmax_q7(
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const q7_t * pSrc,
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uint32_t blockSize,
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q7_t * pResult,
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uint32_t * pIndex)
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{
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q7_t maxVal, out; /* Temporary variables to store the output value. */
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uint32_t blkCnt, outIndex; /* Loop counter */
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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 > 0) ? *pSrc : ((*pSrc == (q7_t) 0x80) ? (q7_t) 0x7f : -*pSrc);
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pSrc++;
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/* Initialize blkCnt with number of samples */
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blkCnt = (blockSize - 1U);
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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 > 0) ? *pSrc : ((*pSrc == (q7_t) 0x80) ? (q7_t) 0x7f : -*pSrc);
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pSrc++;
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/* compare for the maximum value */
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if (out < 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_DSP) */
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#endif /* defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE) */
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/**
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@} end of AbsMax group
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*/
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