123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_dot_prod_f32.c
|
|
* Description: Floating-point dot product
|
|
*
|
|
* $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 groupMath
|
|
*/
|
|
|
|
/**
|
|
* @defgroup dot_prod Vector Dot Product
|
|
*
|
|
* Computes the dot product of two vectors.
|
|
* The vectors are multiplied element-by-element and then summed.
|
|
*
|
|
* <pre>
|
|
* sum = pSrcA[0]*pSrcB[0] + pSrcA[1]*pSrcB[1] + ... + pSrcA[blockSize-1]*pSrcB[blockSize-1]
|
|
* </pre>
|
|
*
|
|
* There are separate functions for floating-point, Q7, Q15, and Q31 data types.
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup dot_prod
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Dot product of floating-point vectors.
|
|
* @param[in] *pSrcA points to the first input vector
|
|
* @param[in] *pSrcB points to the second input vector
|
|
* @param[in] blockSize number of samples in each vector
|
|
* @param[out] *result output result returned here
|
|
* @return none.
|
|
*/
|
|
|
|
|
|
void arm_dot_prod_f32(
|
|
float32_t * pSrcA,
|
|
float32_t * pSrcB,
|
|
uint32_t blockSize,
|
|
float32_t * result)
|
|
{
|
|
float32_t sum = 0.0f; /* Temporary result storage */
|
|
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]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
|
|
/* Calculate dot product and then store the result in a temporary buffer */
|
|
sum += (*pSrcA++) * (*pSrcB++);
|
|
sum += (*pSrcA++) * (*pSrcB++);
|
|
sum += (*pSrcA++) * (*pSrcB++);
|
|
sum += (*pSrcA++) * (*pSrcB++);
|
|
|
|
/* 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 */
|
|
|
|
/* Initialize blkCnt with number of samples */
|
|
blkCnt = blockSize;
|
|
|
|
#endif /* #if defined (ARM_MATH_DSP) */
|
|
|
|
|
|
while (blkCnt > 0u)
|
|
{
|
|
/* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
|
|
/* Calculate dot product and then store the result in a temporary buffer. */
|
|
sum += (*pSrcA++) * (*pSrcB++);
|
|
|
|
/* Decrement the loop counter */
|
|
blkCnt--;
|
|
}
|
|
/* Store the result back in the destination buffer */
|
|
*result = sum;
|
|
}
|
|
|
|
/**
|
|
* @} end of dot_prod group
|
|
*/
|