mbed-os 6.10 versione
cmsis_dsp/ComplexMathFunctions/arm_cmplx_mult_real_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_mult_real_f32.c * * Description: Floating-point complex by real 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 */ /** * @defgroup CmplxByRealMult Complex-by-Real Multiplication * * Multiplies a complex vector by a real 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 while the real array has a total of <code>numSamples</code> * real values. * * The underlying algorithm is used: * * <pre> * for(n=0; n<numSamples; n++) { * pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n]; * pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n]; * } * </pre> * * There are separate functions for floating-point, Q15, and Q31 data types. */ /** * @addtogroup CmplxByRealMult * @{ */ /** * @brief Floating-point 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. */ void arm_cmplx_mult_real_f32( float32_t * pSrcCmplx, float32_t * pSrcReal, float32_t * pCmplxDst, uint32_t numSamples) { float32_t in; /* Temporary variable to store input value */ uint32_t blkCnt; /* loop counters */ #ifndef ARM_MATH_CM0 /* Run the below code for Cortex-M4 and Cortex-M3 */ float32_t inA1, inA2, inA3, inA4; /* Temporary variables to hold input data */ float32_t inA5, inA6, inA7, inA8; /* Temporary variables to hold input data */ float32_t inB1, inB2, inB3, inB4; /* Temporary variables to hold input data */ float32_t out1, out2, out3, out4; /* Temporary variables to hold output data */ float32_t out5, out6, out7, out8; /* Temporary variables to hold output data */ /* 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]. */ /* read input from complex input buffer */ inA1 = pSrcCmplx[0]; inA2 = pSrcCmplx[1]; /* read input from real input buffer */ inB1 = pSrcReal[0]; /* read input from complex input buffer */ inA3 = pSrcCmplx[2]; /* multiply complex buffer real input with real buffer input */ out1 = inA1 * inB1; /* read input from complex input buffer */ inA4 = pSrcCmplx[3]; /* multiply complex buffer imaginary input with real buffer input */ out2 = inA2 * inB1; /* read input from real input buffer */ inB2 = pSrcReal[1]; /* read input from complex input buffer */ inA5 = pSrcCmplx[4]; /* multiply complex buffer real input with real buffer input */ out3 = inA3 * inB2; /* read input from complex input buffer */ inA6 = pSrcCmplx[5]; /* read input from real input buffer */ inB3 = pSrcReal[2]; /* multiply complex buffer imaginary input with real buffer input */ out4 = inA4 * inB2; /* read input from complex input buffer */ inA7 = pSrcCmplx[6]; /* multiply complex buffer real input with real buffer input */ out5 = inA5 * inB3; /* read input from complex input buffer */ inA8 = pSrcCmplx[7]; /* multiply complex buffer imaginary input with real buffer input */ out6 = inA6 * inB3; /* read input from real input buffer */ inB4 = pSrcReal[3]; /* store result to destination bufer */ pCmplxDst[0] = out1; /* multiply complex buffer real input with real buffer input */ out7 = inA7 * inB4; /* store result to destination bufer */ pCmplxDst[1] = out2; /* multiply complex buffer imaginary input with real buffer input */ out8 = inA8 * inB4; /* store result to destination bufer */ pCmplxDst[2] = out3; pCmplxDst[3] = out4; pCmplxDst[4] = out5; /* incremnet complex input buffer by 8 to process next samples */ pSrcCmplx += 8u; /* store result to destination bufer */ pCmplxDst[5] = out6; /* increment real input buffer by 4 to process next samples */ pSrcReal += 4u; /* store result to destination bufer */ pCmplxDst[6] = out7; pCmplxDst[7] = out8; /* increment destination buffer by 8 to process next sampels */ pCmplxDst += 8u; /* 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; #else /* Run the below code for Cortex-M0 */ blkCnt = numSamples; #endif /* #ifndef ARM_MATH_CM0 */ 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++ = (*pSrcCmplx++) * (in); *pCmplxDst++ = (*pSrcCmplx++) * (in); /* Decrement the numSamples loop counter */ blkCnt--; } } /** * @} end of CmplxByRealMult group */