arm_cmplx_dot_prod_f32.c
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| text/x-c
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CLexer
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r41 | /* ---------------------------------------------------------------------- | ||
* Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
* | ||||
* $Date: 15. July 2011 | ||||
* $Revision: V1.0.10 | ||||
* | ||||
* Project: CMSIS DSP Library | ||||
* Title: arm_cmplx_dot_prod_f32.c | ||||
* | ||||
* Description: Floating-point complex dot product | ||||
* | ||||
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 | ||||
* | ||||
* Version 1.0.10 2011/7/15 | ||||
* Big Endian support added and Merged M0 and M3/M4 Source code. | ||||
* | ||||
* Version 1.0.3 2010/11/29 | ||||
* Re-organized the CMSIS folders and updated documentation. | ||||
* | ||||
* Version 1.0.2 2010/11/11 | ||||
* Documentation updated. | ||||
* | ||||
* Version 1.0.1 2010/10/05 | ||||
* Production release and review comments incorporated. | ||||
* | ||||
* Version 1.0.0 2010/09/20 | ||||
* Production release and review comments incorporated. | ||||
* ---------------------------------------------------------------------------- */ | ||||
#include "arm_math.h" | ||||
/** | ||||
* @ingroup groupCmplxMath | ||||
*/ | ||||
/** | ||||
* @defgroup cmplx_dot_prod Complex Dot Product | ||||
* | ||||
* Computes the dot product of two complex vectors. | ||||
* The vectors are multiplied element-by-element and then summed. | ||||
* | ||||
* The <code>pSrcA</code> points to the first complex input vector and | ||||
* <code>pSrcB</code> points to the second complex input vector. | ||||
* <code>numSamples</code> specifies the number of complex samples | ||||
* and the data in each array is stored in an interleaved fashion | ||||
* (real, imag, real, imag, ...). | ||||
* Each array has a total of <code>2*numSamples</code> values. | ||||
* | ||||
* The underlying algorithm is used: | ||||
* <pre> | ||||
* realResult=0; | ||||
* imagResult=0; | ||||
* for(n=0; n<numSamples; n++) { | ||||
* realResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+0] - pSrcA[(2*n)+1]*pSrcB[(2*n)+1]; | ||||
* imagResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+1] + pSrcA[(2*n)+1]*pSrcB[(2*n)+0]; | ||||
* } | ||||
* </pre> | ||||
* | ||||
* There are separate functions for floating-point, Q15, and Q31 data types. | ||||
*/ | ||||
/** | ||||
* @addtogroup cmplx_dot_prod | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Floating-point complex dot product | ||||
* @param *pSrcA points to the first input vector | ||||
* @param *pSrcB points to the second input vector | ||||
* @param numSamples number of complex samples in each vector | ||||
* @param *realResult real part of the result returned here | ||||
* @param *imagResult imaginary part of the result returned here | ||||
* @return none. | ||||
*/ | ||||
void arm_cmplx_dot_prod_f32( | ||||
float32_t * pSrcA, | ||||
float32_t * pSrcB, | ||||
uint32_t numSamples, | ||||
float32_t * realResult, | ||||
float32_t * imagResult) | ||||
{ | ||||
float32_t real_sum = 0.0f, imag_sum = 0.0f; /* Temporary result storage */ | ||||
#ifndef ARM_MATH_CM0 | ||||
/* Run the below code for Cortex-M4 and Cortex-M3 */ | ||||
uint32_t blkCnt; /* loop counter */ | ||||
/*loop Unrolling */ | ||||
blkCnt = numSamples >> 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) | ||||
{ | ||||
/* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ | ||||
real_sum += (*pSrcA++) * (*pSrcB++); | ||||
/* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ | ||||
imag_sum += (*pSrcA++) * (*pSrcB++); | ||||
real_sum += (*pSrcA++) * (*pSrcB++); | ||||
imag_sum += (*pSrcA++) * (*pSrcB++); | ||||
real_sum += (*pSrcA++) * (*pSrcB++); | ||||
imag_sum += (*pSrcA++) * (*pSrcB++); | ||||
real_sum += (*pSrcA++) * (*pSrcB++); | ||||
imag_sum += (*pSrcA++) * (*pSrcB++); | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
/* If the numSamples is not a multiple of 4, compute any remaining output samples here. | ||||
** No loop unrolling is used. */ | ||||
blkCnt = numSamples % 0x4u; | ||||
while(blkCnt > 0u) | ||||
{ | ||||
/* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ | ||||
real_sum += (*pSrcA++) * (*pSrcB++); | ||||
/* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ | ||||
imag_sum += (*pSrcA++) * (*pSrcB++); | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
#else | ||||
/* Run the below code for Cortex-M0 */ | ||||
while(numSamples > 0u) | ||||
{ | ||||
/* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ | ||||
real_sum += (*pSrcA++) * (*pSrcB++); | ||||
/* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ | ||||
imag_sum += (*pSrcA++) * (*pSrcB++); | ||||
/* Decrement the loop counter */ | ||||
numSamples--; | ||||
} | ||||
#endif /* #ifndef ARM_MATH_CM0 */ | ||||
/* Store the real and imaginary results in the destination buffers */ | ||||
*realResult = real_sum; | ||||
*imagResult = imag_sum; | ||||
} | ||||
/** | ||||
* @} end of cmplx_dot_prod group | ||||
*/ | ||||