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/* ----------------------------------------------------------------------
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* Copyright (C) 2010 ARM Limited. All rights reserved.
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*
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* $Date: 29. November 2010
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* $Revision: V1.0.3
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*
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* Project: CMSIS DSP Library
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* Title: arm_dot_prod_f32.c
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*
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* Description: Floating-point dot product.
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*
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* Target Processor: Cortex-M4/Cortex-M3
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*
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* Version 1.0.3 2010/11/29
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* Re-organized the CMSIS folders and updated documentation.
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*
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* Version 1.0.2 2010/11/11
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* Documentation updated.
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*
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* Version 1.0.1 2010/10/05
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* Production release and review comments incorporated.
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*
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* Version 1.0.0 2010/09/20
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* Production release and review comments incorporated.
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*
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* Version 0.0.7 2010/06/10
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* Misra-C changes done
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* ---------------------------------------------------------------------------- */
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#include "arm_math.h"
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/**
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* @ingroup groupMath
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*/
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/**
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* @defgroup dot_prod Vector Dot Product
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*
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* Computes the dot product of two vectors.
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* The vectors are multiplied element-by-element and then summed.
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* There are separate functions for floating-point, Q7, Q15, and Q31 data types.
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*/
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/**
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* @addtogroup dot_prod
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* @{
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*/
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/**
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* @brief Dot product of floating-point vectors.
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* @param[in] *pSrcA points to the first input vector
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* @param[in] *pSrcB points to the second input vector
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* @param[in] blockSize number of samples in each vector
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* @param[out] *result output result returned here
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* @return none.
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*/
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void arm_dot_prod_f32(
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float32_t * pSrcA,
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float32_t * pSrcB,
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uint32_t blockSize,
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float32_t * result)
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{
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float32_t sum = 0.0f; /* Temporary result storage */
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uint32_t blkCnt; /* loop counter */
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/*loop Unrolling */
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blkCnt = blockSize >> 2u;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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while(blkCnt > 0u)
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{
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/* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
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/* Calculate dot product and then store the result in a temporary buffer */
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sum += (*pSrcA++) * (*pSrcB++);
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sum += (*pSrcA++) * (*pSrcB++);
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sum += (*pSrcA++) * (*pSrcB++);
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sum += (*pSrcA++) * (*pSrcB++);
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = blockSize % 0x4u;
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while(blkCnt > 0u)
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{
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/* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
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/* Calculate dot product and then store the result in a temporary buffer. */
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sum += (*pSrcA++) * (*pSrcB++);
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Store the result back in the destination buffer */
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*result = sum;
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}
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/**
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* @} end of dot_prod group
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*/
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