WebSVN – dashGPS – Blame – /branches/dashGPS-bmp/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_dot_prod_f32.c

Rev	Author	Line No.	Line
2	mjames	1	/* ----------------------------------------------------------------------
		2	* Project: CMSIS DSP Library
		3	* Title: arm_dot_prod_f32.c
		4	* Description: Floating-point dot product
		5	*
		6	* $Date: 27. January 2017
		7	* $Revision: V.1.5.1
		8	*
		9	* Target Processor: Cortex-M cores
		10	* -------------------------------------------------------------------- */
		11	/*
		12	* Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
		13	*
		14	* SPDX-License-Identifier: Apache-2.0
		15	*
		16	* Licensed under the Apache License, Version 2.0 (the License); you may
		17	* not use this file except in compliance with the License.
		18	* You may obtain a copy of the License at
		19	*
		20	* www.apache.org/licenses/LICENSE-2.0
		21	*
		22	* Unless required by applicable law or agreed to in writing, software
		23	* distributed under the License is distributed on an AS IS BASIS, WITHOUT
		24	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		25	* See the License for the specific language governing permissions and
		26	* limitations under the License.
		27	*/
		28
		29	#include "arm_math.h"
		30
		31	/**
		32	* @ingroup groupMath
		33	*/
		34
		35	/**
		36	* @defgroup dot_prod Vector Dot Product
		37	*
		38	* Computes the dot product of two vectors.
		39	* The vectors are multiplied element-by-element and then summed.
		40	*
		41	* <pre>
		42	* sum = pSrcA[0]pSrcB[0] + pSrcA[1]pSrcB[1] + ... + pSrcA[blockSize-1]*pSrcB[blockSize-1]
		43	* </pre>
		44	*
		45	* There are separate functions for floating-point, Q7, Q15, and Q31 data types.
		46	*/
		47
		48	/**
		49	* @addtogroup dot_prod
		50	* @{
		51	*/
		52
		53	/**
		54	* @brief Dot product of floating-point vectors.
		55	* @param[in] *pSrcA points to the first input vector
		56	* @param[in] *pSrcB points to the second input vector
		57	* @param[in] blockSize number of samples in each vector
		58	* @param[out] *result output result returned here
		59	* @return none.
		60	*/
		61
		62
		63	void arm_dot_prod_f32(
		64	float32_t * pSrcA,
		65	float32_t * pSrcB,
		66	uint32_t blockSize,
		67	float32_t * result)
		68	{
		69	float32_t sum = 0.0f; /* Temporary result storage */
		70	uint32_t blkCnt; /* loop counter */
		71
		72
		73	#if defined (ARM_MATH_DSP)
		74
		75	/* Run the below code for Cortex-M4 and Cortex-M3 */
		76	/loop Unrolling /
		77	blkCnt = blockSize >> 2U;
		78
		79	/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
		80	** a second loop below computes the remaining 1 to 3 samples. */
		81	while (blkCnt > 0U)
		82	{
		83	/* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
		84	/* Calculate dot product and then store the result in a temporary buffer */
		85	sum += (pSrcA++) (*pSrcB++);
		86	sum += (pSrcA++) (*pSrcB++);
		87	sum += (pSrcA++) (*pSrcB++);
		88	sum += (pSrcA++) (*pSrcB++);
		89
		90	/* Decrement the loop counter */
		91	blkCnt--;
		92	}
		93
		94	/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
		95	** No loop unrolling is used. */
		96	blkCnt = blockSize % 0x4U;
		97
		98	#else
		99
		100	/* Run the below code for Cortex-M0 */
		101
		102	/* Initialize blkCnt with number of samples */
		103	blkCnt = blockSize;
		104
		105	#endif /* #if defined (ARM_MATH_DSP) */
		106
		107
		108	while (blkCnt > 0U)
		109	{
		110	/* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
		111	/* Calculate dot product and then store the result in a temporary buffer. */
		112	sum += (pSrcA++) (*pSrcB++);
		113
		114	/* Decrement the loop counter */
		115	blkCnt--;
		116	}
		117	/* Store the result back in the destination buffer */
		118	*result = sum;
		119	}
		120
		121	/**
		122	* @} end of dot_prod group
		123	*/

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(root)/branches/dashGPS-bmp/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_dot_prod_f32.c – Rev 2