130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_power_f32.c
|
|
* Description: Sum of the squares of the elements of a floating-point vector
|
|
*
|
|
* $Date: 27. January 2017
|
|
* $Revision: V.1.5.1
|
|
*
|
|
* Target Processor: Cortex-M cores
|
|
* -------------------------------------------------------------------- */
|
|
/*
|
|
* Copyright (C) 2010-2017 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 "arm_math.h"
|
|
|
|
/**
|
|
* @ingroup groupStats
|
|
*/
|
|
|
|
/**
|
|
* @defgroup power Power
|
|
*
|
|
* Calculates the sum of the squares of the elements in the input vector.
|
|
* The underlying algorithm is used:
|
|
*
|
|
* <pre>
|
|
* Result = pSrc[0] * pSrc[0] + pSrc[1] * pSrc[1] + pSrc[2] * pSrc[2] + ... + pSrc[blockSize-1] * pSrc[blockSize-1];
|
|
* </pre>
|
|
*
|
|
* There are separate functions for floating point, Q31, Q15, and Q7 data types.
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup power
|
|
* @{
|
|
*/
|
|
|
|
|
|
/**
|
|
* @brief Sum of the squares of the elements of a floating-point vector.
|
|
* @param[in] *pSrc points to the input vector
|
|
* @param[in] blockSize length of the input vector
|
|
* @param[out] *pResult sum of the squares value returned here
|
|
* @return none.
|
|
*
|
|
*/
|
|
|
|
|
|
void arm_power_f32(
|
|
float32_t * pSrc,
|
|
uint32_t blockSize,
|
|
float32_t * pResult)
|
|
{
|
|
float32_t sum = 0.0f; /* accumulator */
|
|
float32_t in; /* Temporary variable to store input value */
|
|
uint32_t blkCnt; /* loop counter */
|
|
|
|
#if defined (ARM_MATH_DSP)
|
|
/* Run the below code for Cortex-M4 and Cortex-M3 */
|
|
|
|
/*loop Unrolling */
|
|
blkCnt = blockSize >> 2U;
|
|
|
|
/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
|
|
** a second loop below computes the remaining 1 to 3 samples. */
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */
|
|
/* Compute Power and then store the result in a temporary variable, sum. */
|
|
in = *pSrc++;
|
|
sum += in * in;
|
|
in = *pSrc++;
|
|
sum += in * in;
|
|
in = *pSrc++;
|
|
sum += in * in;
|
|
in = *pSrc++;
|
|
sum += in * in;
|
|
|
|
/* Decrement the loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
|
|
** No loop unrolling is used. */
|
|
blkCnt = blockSize % 0x4U;
|
|
|
|
|
|
#else
|
|
/* Run the below code for Cortex-M0 */
|
|
|
|
/* Loop over blockSize number of values */
|
|
blkCnt = blockSize;
|
|
|
|
#endif /* #if defined (ARM_MATH_DSP) */
|
|
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */
|
|
/* compute power and then store the result in a temporary variable, sum. */
|
|
in = *pSrc++;
|
|
sum += in * in;
|
|
|
|
/* Decrement the loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
/* Store the result to the destination */
|
|
*pResult = sum;
|
|
}
|
|
|
|
/**
|
|
* @} end of power group
|
|
*/
|