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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_min_no_idx_f16.c
* Description: Minimum value of a floating-point vector without returning the index
*
* $Date: 16 November 2021
* $Revision: V1.10.0
*
* 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_f16.h"
#if defined(ARM_FLOAT16_SUPPORTED)
#if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE)
#include <limits.h>
#endif
/**
@ingroup groupStats
*/
/**
@addtogroup Min
@{
*/
/**
@brief Minimum 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 minimum value returned here
@return none
*/
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
void arm_min_no_idx_f16(
const float16_t *pSrc,
uint32_t blockSize,
float16_t *pResult)
{
f16x8_t vecSrc;
f16x8_t curExtremValVec = vdupq_n_f16(F16_MAX);
float16_t minValue = F16_MAX;
float16_t newVal;
uint32_t blkCnt;
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 3U;
while (blkCnt > 0U)
{
vecSrc = vldrhq_f16(pSrc);
/*
* update per-lane min.
*/
curExtremValVec = vminnmq(vecSrc, curExtremValVec);
/*
* Decrement the blockSize loop counter
* Advance vector source and destination pointers
*/
pSrc += 8;
blkCnt --;
}
/*
* Get min value across the vector
*/
minValue = vminnmvq(minValue, curExtremValVec);
blkCnt = blockSize & 7;
while (blkCnt > 0U)
{
newVal = *pSrc++;
/* compare for the minimum value */
if ((_Float16)minValue > (_Float16)newVal)
{
/* Update the minimum value and it's index */
minValue = newVal;
}
blkCnt --;
}
*pResult = minValue;
}
#else
void arm_min_no_idx_f16(
const float16_t *pSrc,
uint32_t blockSize,
float16_t *pResult)
{
float16_t minValue = F16_MAX;
float16_t newVal;
while (blockSize > 0U)
{
newVal = *pSrc++;
/* compare for the minimum value */
if ((_Float16)minValue > (_Float16)newVal)
{
/* Update the minimum value and it's index */
minValue = newVal;
}
blockSize --;
}
*pResult = minValue;
}
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
@} end of Min group
*/
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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