mbed-os 6.10 versione
cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_f32.c
- Committer:
- emilmont
- Date:
- 2013-05-30
- Revision:
- 2:da51fb522205
- Parent:
- 1:fdd22bb7aa52
- Child:
- 3:7a284390b0ce
File content as of revision 2:da51fb522205:
/* ---------------------------------------------------------------------- * 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 */