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src/Cortex-M4-M3/ComplexMathFunctions/arm_cmplx_dot_prod_f32.c@0:1014af42efd9, 2011-03-10 (annotated)

Committer:: simon
Date:: Thu Mar 10 15:07:50 2011 +0000
Revision:: 0:1014af42efd9

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User	Revision	Line number	New contents of line
simon	0:1014af42efd9	1	/* ----------------------------------------------------------------------
simon	0:1014af42efd9	2	* Copyright (C) 2010 ARM Limited. All rights reserved.
simon	0:1014af42efd9	3	*
simon	0:1014af42efd9	4	* $Date: 29. November 2010
simon	0:1014af42efd9	5	* $Revision: V1.0.3
simon	0:1014af42efd9	6	*
simon	0:1014af42efd9	7	* Project: CMSIS DSP Library
simon	0:1014af42efd9	8	* Title: arm_cmplx_dot_prod_f32.c
simon	0:1014af42efd9	9	*
simon	0:1014af42efd9	10	* Description: Floating-point complex dot product
simon	0:1014af42efd9	11	*
simon	0:1014af42efd9	12	* Target Processor: Cortex-M4/Cortex-M3
simon	0:1014af42efd9	13	*
simon	0:1014af42efd9	14	* Version 1.0.3 2010/11/29
simon	0:1014af42efd9	15	* Re-organized the CMSIS folders and updated documentation.
simon	0:1014af42efd9	16	*
simon	0:1014af42efd9	17	* Version 1.0.2 2010/11/11
simon	0:1014af42efd9	18	* Documentation updated.
simon	0:1014af42efd9	19	*
simon	0:1014af42efd9	20	* Version 1.0.1 2010/10/05
simon	0:1014af42efd9	21	* Production release and review comments incorporated.
simon	0:1014af42efd9	22	*
simon	0:1014af42efd9	23	* Version 1.0.0 2010/09/20
simon	0:1014af42efd9	24	* Production release and review comments incorporated.
simon	0:1014af42efd9	25	* ---------------------------------------------------------------------------- */
simon	0:1014af42efd9	26
simon	0:1014af42efd9	27	#include "arm_math.h"
simon	0:1014af42efd9	28
simon	0:1014af42efd9	29	/**
simon	0:1014af42efd9	30	* @ingroup groupCmplxMath
simon	0:1014af42efd9	31	*/
simon	0:1014af42efd9	32
simon	0:1014af42efd9	33	/**
simon	0:1014af42efd9	34	* @defgroup cmplx_dot_prod Complex Dot Product
simon	0:1014af42efd9	35	*
simon	0:1014af42efd9	36	* Computes the dot product of two complex vectors.
simon	0:1014af42efd9	37	* The vectors are multiplied element-by-element and then summed.
simon	0:1014af42efd9	38	*
simon	0:1014af42efd9	39	* The <code>pSrcA</code> points to the first complex input vector and
simon	0:1014af42efd9	40	* <code>pSrcB</code> points to the second complex input vector.
simon	0:1014af42efd9	41	* <code>numSamples</code> specifies the number of complex samples
simon	0:1014af42efd9	42	* and the data in each array is stored in an interleaved fashion
simon	0:1014af42efd9	43	* (real, imag, real, imag, ...).
simon	0:1014af42efd9	44	* Each array has a total of <code>2*numSamples</code> values.
simon	0:1014af42efd9	45	*
simon	0:1014af42efd9	46	* The underlying algorithm is used:
simon	0:1014af42efd9	47	* <pre>
simon	0:1014af42efd9	48	* realResult=0;
simon	0:1014af42efd9	49	* imagResult=0;
simon	0:1014af42efd9	50	* for(n=0; n<numSamples; n++) {
simon	0:1014af42efd9	51	* realResult += pSrcA[(2n)+0]pSrcB[(2n)+0] - pSrcA[(2n)+1]pSrcB[(2n)+1];
simon	0:1014af42efd9	52	* imagResult += pSrcA[(2n)+0]pSrcB[(2n)+1] + pSrcA[(2n)+1]pSrcB[(2n)+0];
simon	0:1014af42efd9	53	* }
simon	0:1014af42efd9	54	* </pre>
simon	0:1014af42efd9	55	*
simon	0:1014af42efd9	56	* There are separate functions for floating-point, Q15, and Q31 data types.
simon	0:1014af42efd9	57	*/
simon	0:1014af42efd9	58
simon	0:1014af42efd9	59	/**
simon	0:1014af42efd9	60	* @addtogroup cmplx_dot_prod
simon	0:1014af42efd9	61	* @{
simon	0:1014af42efd9	62	*/
simon	0:1014af42efd9	63
simon	0:1014af42efd9	64	/**
simon	0:1014af42efd9	65	* @brief Floating-point complex dot product
simon	0:1014af42efd9	66	* @param *pSrcA points to the first input vector
simon	0:1014af42efd9	67	* @param *pSrcB points to the second input vector
simon	0:1014af42efd9	68	* @param numSamples number of complex samples in each vector
simon	0:1014af42efd9	69	* @param *realResult real part of the result returned here
simon	0:1014af42efd9	70	* @param *imagResult imaginary part of the result returned here
simon	0:1014af42efd9	71	* @return none.
simon	0:1014af42efd9	72	*/
simon	0:1014af42efd9	73
simon	0:1014af42efd9	74	void arm_cmplx_dot_prod_f32(
simon	0:1014af42efd9	75	float32_t * pSrcA,
simon	0:1014af42efd9	76	float32_t * pSrcB,
simon	0:1014af42efd9	77	uint32_t numSamples,
simon	0:1014af42efd9	78	float32_t * realResult,
simon	0:1014af42efd9	79	float32_t * imagResult)
simon	0:1014af42efd9	80	{
simon	0:1014af42efd9	81	float32_t real_sum = 0.0f, imag_sum = 0.0f; /* Temporary result storage */
simon	0:1014af42efd9	82	uint32_t blkCnt; /* loop counter */
simon	0:1014af42efd9	83
simon	0:1014af42efd9	84	/loop Unrolling /
simon	0:1014af42efd9	85	blkCnt = numSamples >> 2u;
simon	0:1014af42efd9	86
simon	0:1014af42efd9	87	/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
simon	0:1014af42efd9	88	** a second loop below computes the remaining 1 to 3 samples. */
simon	0:1014af42efd9	89	while(blkCnt > 0u)
simon	0:1014af42efd9	90	{
simon	0:1014af42efd9	91	/* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */
simon	0:1014af42efd9	92	real_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	93	/* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */
simon	0:1014af42efd9	94	imag_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	95
simon	0:1014af42efd9	96	real_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	97	imag_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	98
simon	0:1014af42efd9	99	real_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	100	imag_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	101
simon	0:1014af42efd9	102	real_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	103	imag_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	104
simon	0:1014af42efd9	105	/* Decrement the loop counter */
simon	0:1014af42efd9	106	blkCnt--;
simon	0:1014af42efd9	107	}
simon	0:1014af42efd9	108
simon	0:1014af42efd9	109	/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
simon	0:1014af42efd9	110	** No loop unrolling is used. */
simon	0:1014af42efd9	111	blkCnt = numSamples % 0x4u;
simon	0:1014af42efd9	112
simon	0:1014af42efd9	113	while(blkCnt > 0u)
simon	0:1014af42efd9	114	{
simon	0:1014af42efd9	115	/* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */
simon	0:1014af42efd9	116	real_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	117	/* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */
simon	0:1014af42efd9	118	imag_sum += (pSrcA++) (*pSrcB++);
simon	0:1014af42efd9	119
simon	0:1014af42efd9	120
simon	0:1014af42efd9	121	/* Decrement the loop counter */
simon	0:1014af42efd9	122	blkCnt--;
simon	0:1014af42efd9	123	}
simon	0:1014af42efd9	124
simon	0:1014af42efd9	125	/* Store the real and imaginary results in the destination buffers */
simon	0:1014af42efd9	126	*realResult = real_sum;
simon	0:1014af42efd9	127	*imagResult = imag_sum;
simon	0:1014af42efd9	128	}
simon	0:1014af42efd9	129
simon	0:1014af42efd9	130	/**
simon	0:1014af42efd9	131	* @} end of cmplx_dot_prod group
simon	0:1014af42efd9	132	*/

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Type:	Library
Created:	10 Mar 2011
Imports:	907
Forks:	1
Commits:	3
Dependents:	5
Dependencies:	0
Followers:	35

src/Cortex-M4-M3/ComplexMathFunctions/arm_cmplx_dot_prod_f32.c@0:1014af42efd9, 2011-03-10 (annotated)

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