arm_cmplx_mult_real_q31.c
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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_real_q31.c | ||||
* | ||||
* Description: Q31 complex by real 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 CmplxByRealMult | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Q31 complex-by-real multiplication | ||||
* @param[in] *pSrcCmplx points to the complex input vector | ||||
* @param[in] *pSrcReal points to the real input vector | ||||
* @param[out] *pCmplxDst points to the complex output vector | ||||
* @param[in] numSamples number of samples in each vector | ||||
* @return none. | ||||
* | ||||
* <b>Scaling and Overflow Behavior:</b> | ||||
* \par | ||||
* The function uses saturating arithmetic. | ||||
* Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated. | ||||
*/ | ||||
void arm_cmplx_mult_real_q31( | ||||
q31_t * pSrcCmplx, | ||||
q31_t * pSrcReal, | ||||
q31_t * pCmplxDst, | ||||
uint32_t numSamples) | ||||
{ | ||||
q31_t in; /* Temporary variable to store input value */ | ||||
#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[i]. */ | ||||
/* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ | ||||
in = *pSrcReal++; | ||||
/* store the result in the destination buffer. */ | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
in = *pSrcReal++; | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
in = *pSrcReal++; | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
in = *pSrcReal++; | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
/* Decrement the numSamples 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) | ||||
{ | ||||
/* C[2 * i] = A[2 * i] * B[i]. */ | ||||
/* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ | ||||
in = *pSrcReal++; | ||||
/* store the result in the destination buffer. */ | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
/* Decrement the numSamples loop counter */ | ||||
blkCnt--; | ||||
} | ||||
#else | ||||
/* Run the below code for Cortex-M0 */ | ||||
while(numSamples > 0u) | ||||
{ | ||||
/* realOut = realA * realB. */ | ||||
/* imagReal = imagA * realB. */ | ||||
in = *pSrcReal++; | ||||
/* store the result in the destination buffer. */ | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
*pCmplxDst++ = | ||||
(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * in) >> 31); | ||||
/* Decrement the numSamples loop counter */ | ||||
numSamples--; | ||||
} | ||||
#endif /* #ifndef ARM_MATH_CM0 */ | ||||
} | ||||
/** | ||||
* @} end of CmplxByRealMult group | ||||
*/ | ||||