arm_cmplx_mult_cmplx_q15.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_mult_cmplx_q15.c | ||||
* | ||||
* Description: Q15 complex-by-complex multiplication | ||||
* | ||||
* 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 | ||||
*/ | ||||
/** | ||||
* @addtogroup CmplxByCmplxMult | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Q15 complex-by-complex multiplication | ||||
* @param[in] *pSrcA points to the first input vector | ||||
* @param[in] *pSrcB points to the second input vector | ||||
* @param[out] *pDst points to the output vector | ||||
* @param[in] numSamples number of complex samples in each vector | ||||
* @return none. | ||||
* | ||||
* <b>Scaling and Overflow Behavior:</b> | ||||
* \par | ||||
* The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format. | ||||
*/ | ||||
void arm_cmplx_mult_cmplx_q15( | ||||
q15_t * pSrcA, | ||||
q15_t * pSrcB, | ||||
q15_t * pDst, | ||||
uint32_t numSamples) | ||||
{ | ||||
q15_t a, b, c, d; /* Temporary variables to store real and imaginary values */ | ||||
#ifndef ARM_MATH_CM0 | ||||
/* Run the below code for Cortex-M4 and Cortex-M3 */ | ||||
uint32_t blkCnt; /* loop counters */ | ||||
/* 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) | ||||
{ | ||||
/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */ | ||||
/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */ | ||||
a = *pSrcA++; | ||||
b = *pSrcA++; | ||||
c = *pSrcB++; | ||||
d = *pSrcB++; | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); | ||||
a = *pSrcA++; | ||||
b = *pSrcA++; | ||||
c = *pSrcB++; | ||||
d = *pSrcB++; | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); | ||||
a = *pSrcA++; | ||||
b = *pSrcA++; | ||||
c = *pSrcB++; | ||||
d = *pSrcB++; | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); | ||||
a = *pSrcA++; | ||||
b = *pSrcA++; | ||||
c = *pSrcB++; | ||||
d = *pSrcB++; | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); | ||||
/* Decrement the blockSize loop counter */ | ||||
blkCnt--; | ||||
} | ||||
/* If the blockSize is not a multiple of 4, compute any remaining output samples here. | ||||
** No loop unrolling is used. */ | ||||
blkCnt = numSamples % 0x4u; | ||||
while(blkCnt > 0u) | ||||
{ | ||||
/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */ | ||||
/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */ | ||||
a = *pSrcA++; | ||||
b = *pSrcA++; | ||||
c = *pSrcB++; | ||||
d = *pSrcB++; | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); | ||||
/* Decrement the blockSize loop counter */ | ||||
blkCnt--; | ||||
} | ||||
#else | ||||
/* Run the below code for Cortex-M0 */ | ||||
while(numSamples > 0u) | ||||
{ | ||||
/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */ | ||||
/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */ | ||||
a = *pSrcA++; | ||||
b = *pSrcA++; | ||||
c = *pSrcB++; | ||||
d = *pSrcB++; | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); | ||||
/* store the result in 3.13 format in the destination buffer. */ | ||||
*pDst++ = | ||||
(q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); | ||||
/* Decrement the blockSize loop counter */ | ||||
numSamples--; | ||||
} | ||||
#endif /* #ifndef ARM_MATH_CM0 */ | ||||
} | ||||
/** | ||||
* @} end of CmplxByCmplxMult group | ||||
*/ | ||||