| /* ---------------------------------------------------------------------- |
| * 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 |
| */ |