153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_power_f16.c
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* Description: Sum of the squares of the elements of a floating-point vector
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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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_f16.h"
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#if defined(ARM_FLOAT16_SUPPORTED)
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/**
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@ingroup groupStats
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*/
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/**
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@addtogroup power
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@{
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*/
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/**
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@brief Sum of the squares of the elements 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 sum of the squares value returned here
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@return none
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*/
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#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
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#include "arm_helium_utils.h"
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void arm_power_f16(
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const float16_t * pSrc,
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uint32_t blockSize,
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float16_t * pResult)
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{
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int32_t blkCnt; /* loop counters */
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f16x8_t vecSrc;
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f16x8_t sumVec = vdupq_n_f16(0.0f);
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blkCnt = blockSize;
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do {
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mve_pred16_t p = vctp16q(blkCnt);
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vecSrc = vldrhq_z_f16((float16_t const *) pSrc, p);
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/*
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* sum lanes
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*/
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sumVec = vfmaq_m(sumVec, vecSrc, vecSrc, p);
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blkCnt -= 8;
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pSrc += 8;
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}
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while (blkCnt > 0);
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*pResult = vecAddAcrossF16Mve(sumVec);
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}
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#else
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void arm_power_f16(
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const float16_t * pSrc,
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uint32_t blockSize,
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float16_t * pResult)
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{
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uint32_t blkCnt; /* Loop counter */
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_Float16 sum = 0.0f16; /* Temporary result storage */
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_Float16 in; /* Temporary variable to store input value */
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#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
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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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/* C = A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */
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/* Compute Power and store result in a temporary variable, sum. */
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in = *pSrc++;
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sum += in * in;
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in = *pSrc++;
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sum += in * in;
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in = *pSrc++;
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sum += in * in;
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in = *pSrc++;
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sum += in * in;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Loop unrolling: Compute remaining outputs */
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blkCnt = blockSize % 0x4U;
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#else
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/* Initialize blkCnt with number of samples */
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blkCnt = blockSize;
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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while (blkCnt > 0U)
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{
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/* C = A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */
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/* Compute Power and store result in a temporary variable, sum. */
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in = *pSrc++;
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sum += in * in;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Store result to destination */
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*pResult = sum;
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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 power group
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*/
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#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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