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144 lines
5.1 KiB
C
144 lines
5.1 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_max_no_idx_q7.c
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* Description: Maximum value of a q7 vector without returning the index
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*
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* $Date: 16 November 2021
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* $Revision: V1.10.0
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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 Max
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@{
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*/
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/**
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@brief Maximum value of a q7 vector without index.
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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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@return none
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*/
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#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
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#include "arm_helium_utils.h"
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void arm_max_no_idx_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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{
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int32_t blkCnt; /* loop counters */
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q7x16_t vecSrc;
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q7_t const *pSrcVec;
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q7x16_t curExtremValVec = vdupq_n_s8(Q7_MIN);
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q7_t maxValue = Q7_MIN;
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mve_pred16_t p0;
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pSrcVec = (q7_t const *) pSrc;
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blkCnt = blockSize >> 4;
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while (blkCnt > 0)
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{
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vecSrc = vld1q(pSrcVec);
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pSrcVec += 16;
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/*
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* update per-lane max.
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*/
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curExtremValVec = vmaxq(vecSrc, curExtremValVec);
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/*
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* Decrement the blockSize loop counter
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*/
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blkCnt--;
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}
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/*
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* tail
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* (will be merged thru tail predication)
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*/
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blkCnt = blockSize & 0xF;
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if (blkCnt > 0)
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{
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vecSrc = vld1q(pSrcVec);
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pSrcVec += 16;
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p0 = vctp8q(blkCnt);
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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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curExtremValVec = vmaxq_m(curExtremValVec, vecSrc, curExtremValVec, p0);
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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 = vmaxvq(maxValue, curExtremValVec);
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*pResult = maxValue;
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}
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#else
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void arm_max_no_idx_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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{
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q7_t maxVal1, out; /* Temporary variables to store the output value. */
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uint32_t blkCnt; /* loop counter */
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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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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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maxVal1 = *pSrc++;
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/* compare for the maximum value */
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if (out < maxVal1)
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{
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/* Update the maximum value */
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out = maxVal1;
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}
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Store the maximum value into destination pointer */
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*pResult = out;
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}
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#endif /* #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE) */
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/**
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@} end of Max group
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*/
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