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139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_min_no_idx_f32.c
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* Description: Minimum value of a floating-point 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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#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 Min
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@{
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*/
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/**
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@brief Minimum 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 minimum value returned here
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@return none
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*/
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#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
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void arm_min_no_idx_f32(
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const float32_t *pSrc,
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uint32_t blockSize,
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float32_t *pResult)
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{
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f32x4_t vecSrc;
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f32x4_t curExtremValVec = vdupq_n_f32(F32_MAX);
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float32_t minValue = F32_MAX;
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float32_t newVal;
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uint32_t blkCnt;
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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while (blkCnt > 0U)
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{
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vecSrc = vldrwq_f32(pSrc);
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/*
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* update per-lane min.
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*/
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curExtremValVec = vminnmq(vecSrc, curExtremValVec);
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/*
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* Decrement the blockSize loop counter
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* Advance vector source and destination pointers
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*/
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pSrc += 4;
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blkCnt --;
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}
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/*
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* Get min value across the vector
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*/
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minValue = vminnmvq(minValue, curExtremValVec);
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blkCnt = blockSize & 3;
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while (blkCnt > 0U)
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{
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newVal = *pSrc++;
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/* compare for the minimum value */
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if (minValue > newVal)
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{
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/* Update the minimum value and it's index */
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minValue = newVal;
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}
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blkCnt --;
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}
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*pResult = minValue;
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}
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#else
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void arm_min_no_idx_f32(
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const float32_t *pSrc,
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uint32_t blockSize,
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float32_t *pResult)
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{
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float32_t minValue = F32_MAX;
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float32_t newVal;
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while (blockSize > 0U)
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{
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newVal = *pSrc++;
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/* compare for the minimum value */
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if (minValue > newVal)
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{
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/* Update the minimum value and it's index */
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minValue = newVal;
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}
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blockSize --;
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}
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*pResult = minValue;
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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 Min group
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*/
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