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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_max_no_idx_f32.c
* Description: Maximum value of a floating-point vector without returning the index
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dsp/statistics_functions.h"
#if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE)
#include <limits.h>
#endif
/**
@ingroup groupStats
*/
/**
@addtogroup Max
@{
*/
/**
@brief Maximum value of a floating-point vector.
@param[in] pSrc points to the input vector
@param[in] blockSize number of samples in input vector
@param[out] pResult maximum value returned here
@return none
*/
#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
void arm_max_no_idx_f32(
const float32_t *pSrc,
uint32_t blockSize,
float32_t *pResult)
{
f32x4_t vecSrc;
f32x4_t curExtremValVec = vdupq_n_f32(F32_MIN);
float32_t maxValue = F32_MIN;
float32_t newVal;
uint32_t blkCnt;
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
vecSrc = vldrwq_f32(pSrc);
/*
* update per-lane max.
*/
curExtremValVec = vmaxnmq(vecSrc, curExtremValVec);
/*
* Decrement the blockSize loop counter
* Advance vector source and destination pointers
*/
pSrc += 4;
blkCnt --;
}
/*
* Get max value across the vector
*/
maxValue = vmaxnmvq(maxValue, curExtremValVec);
blkCnt = blockSize & 3;
while (blkCnt > 0U)
{
newVal = *pSrc++;
/* compare for the maximum value */
if (maxValue < newVal)
{
/* Update the maximum value and it's index */
maxValue = newVal;
}
blkCnt --;
}
*pResult = maxValue;
}
#else
void arm_max_no_idx_f32(
const float32_t *pSrc,
uint32_t blockSize,
float32_t *pResult)
{
float32_t maxValue = F32_MIN;
float32_t newVal;
while (blockSize > 0U)
{
newVal = *pSrc++;
/* compare for the maximum value */
if (maxValue < newVal)
{
/* Update the maximum value and it's index */
maxValue = newVal;
}
blockSize --;
}
*pResult = maxValue;
}
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
@} end of Max group
*/
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