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# arm_cmplx_mult_real_f32.c

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    00001 /* ----------------------------------------------------------------------
    00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
    00003 *
    00004 * $Date:        29. November 2010
    00005 * $Revision:    V1.0.3
    00006 *
    00007 * Project:      CMSIS DSP Library
    00008 * Title:        arm_cmplx_mult_real_f32.c
    00009 *
    00010 * Description:  Floating-point complex by real multiplication
    00011 *
    00012 * Target Processor: Cortex-M4/Cortex-M3
    00013 *
    00014 * Version 1.0.3 2010/11/29
    00015 *    Re-organized the CMSIS folders and updated documentation.
    00016 *
    00017 * Version 1.0.2 2010/11/11
    00018 *    Documentation updated.
    00019 *
    00020 * Version 1.0.1 2010/10/05
    00021 *    Production release and review comments incorporated.
    00022 *
    00023 * Version 1.0.0 2010/09/20
    00024 *    Production release and review comments incorporated.
    00025 * -------------------------------------------------------------------- */
    00026
    00027 #include "arm_math.h"
    00028
    00071 void arm_cmplx_mult_real_f32(
    00072   float32_t * pSrcCmplx,
    00073   float32_t * pSrcReal,
    00074   float32_t * pCmplxDst,
    00075   uint32_t numSamples)
    00076 {
    00077   float32_t in;                                  /* Temporary variable to store input value */
    00078   uint32_t blkCnt;                               /* loop counters */
    00079
    00080   /* loop Unrolling */
    00081   blkCnt = numSamples >> 2u;
    00082
    00083   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00084    ** a second loop below computes the remaining 1 to 3 samples. */
    00085   while(blkCnt > 0u)
    00086   {
    00087     /* C[2 * i] = A[2 * i] * B[i].            */
    00088     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
    00089     in = *pSrcReal++;
    00090     /* store the result in the destination buffer. */
    00091     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00092     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00093
    00094     in = *pSrcReal++;
    00095     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00096     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00097
    00098     in = *pSrcReal++;
    00099     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00100     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00101
    00102     in = *pSrcReal++;
    00103     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00104     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00105
    00106     /* Decrement the numSamples loop counter */
    00107     blkCnt--;
    00108   }
    00109
    00110   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00111    ** No loop unrolling is used. */
    00112   blkCnt = numSamples % 0x4u;
    00113
    00114   while(blkCnt > 0u)
    00115   {
    00116     /* C[2 * i] = A[2 * i] * B[i].            */
    00117     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
    00118     in = *pSrcReal++;
    00119     /* store the result in the destination buffer. */
    00120     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00121     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00122
    00123     /* Decrement the numSamples loop counter */
    00124     blkCnt--;
    00125   }
    00126 }
    00127

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