mbed-os 6.10 versione
Diff: cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_f32.c
- Revision:
- 1:fdd22bb7aa52
- Child:
- 2:da51fb522205
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_f32.c Wed Nov 28 12:30:09 2012 +0000 @@ -0,0 +1,160 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010 ARM Limited. All rights reserved. +* +* $Date: 15. February 2012 +* $Revision: V1.1.0 +* +* 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 1.1.0 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 + */ + +/** + * @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 + */