|
|
/* ----------------------------------------------------------------------
|
|
|
* 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_f32.c
|
|
|
*
|
|
|
* Description: Floating-point 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
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @defgroup CmplxByCmplxMult Complex-by-Complex Multiplication
|
|
|
*
|
|
|
* Multiplies a complex vector by another complex vector and generates a complex result.
|
|
|
* The data in the complex arrays is stored in an interleaved fashion
|
|
|
* (real, imag, real, imag, ...).
|
|
|
* The parameter <code>numSamples</code> represents the number of complex
|
|
|
* samples processed. The complex arrays have a total of <code>2*numSamples</code>
|
|
|
* real values.
|
|
|
*
|
|
|
* The underlying algorithm is used:
|
|
|
*
|
|
|
* <pre>
|
|
|
* for(n=0; n<numSamples; n++) {
|
|
|
* pDst[(2*n)+0] = pSrcA[(2*n)+0] * pSrcB[(2*n)+0] - pSrcA[(2*n)+1] * pSrcB[(2*n)+1];
|
|
|
* pDst[(2*n)+1] = 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 CmplxByCmplxMult
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
|
|
|
/**
|
|
|
* @brief Floating-point 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.
|
|
|
*/
|
|
|
|
|
|
void arm_cmplx_mult_cmplx_f32(
|
|
|
float32_t * pSrcA,
|
|
|
float32_t * pSrcB,
|
|
|
float32_t * pDst,
|
|
|
uint32_t numSamples)
|
|
|
{
|
|
|
float32_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 the destination buffer. */
|
|
|
*pDst++ = (a * c) - (b * d);
|
|
|
*pDst++ = (a * d) + (b * c);
|
|
|
|
|
|
a = *pSrcA++;
|
|
|
b = *pSrcA++;
|
|
|
c = *pSrcB++;
|
|
|
d = *pSrcB++;
|
|
|
|
|
|
*pDst++ = (a * c) - (b * d);
|
|
|
*pDst++ = (a * d) + (b * c);
|
|
|
|
|
|
a = *pSrcA++;
|
|
|
b = *pSrcA++;
|
|
|
c = *pSrcB++;
|
|
|
d = *pSrcB++;
|
|
|
|
|
|
*pDst++ = (a * c) - (b * d);
|
|
|
*pDst++ = (a * d) + (b * c);
|
|
|
|
|
|
a = *pSrcA++;
|
|
|
b = *pSrcA++;
|
|
|
c = *pSrcB++;
|
|
|
d = *pSrcB++;
|
|
|
|
|
|
*pDst++ = (a * c) - (b * d);
|
|
|
*pDst++ = (a * d) + (b * c);
|
|
|
|
|
|
/* 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[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 the destination buffer. */
|
|
|
*pDst++ = (a * c) - (b * d);
|
|
|
*pDst++ = (a * d) + (b * c);
|
|
|
|
|
|
/* Decrement the numSamples 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 the destination buffer. */
|
|
|
*pDst++ = (a * c) - (b * d);
|
|
|
*pDst++ = (a * d) + (b * c);
|
|
|
|
|
|
/* Decrement the numSamples loop counter */
|
|
|
numSamples--;
|
|
|
}
|
|
|
|
|
|
#endif /* #ifndef ARM_MATH_CM0 */
|
|
|
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @} end of CmplxByCmplxMult group
|
|
|
*/
|
|
|
|