mbed-os 6.10 versione
Diff: cmsis_dsp/ComplexMathFunctions/arm_cmplx_mult_cmplx_q15.c
- Revision:
- 1:fdd22bb7aa52
- Child:
- 2:da51fb522205
diff -r 83d0537c7d84 -r fdd22bb7aa52 cmsis_dsp/ComplexMathFunctions/arm_cmplx_mult_cmplx_q15.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/cmsis_dsp/ComplexMathFunctions/arm_cmplx_mult_cmplx_q15.c Wed Nov 28 12:30:09 2012 +0000 @@ -0,0 +1,185 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010 ARM Limited. All rights reserved. +* +* $Date: 15. February 2012 +* $Revision: V1.1.0 +* +* 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 1.1.0 2012/02/15 +* Updated with more optimizations, bug fixes and minor API changes. +* +* 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 + */