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# arm_cmplx_dot_prod_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_dot_prod_f32.c
    00009 *
    00010 * Description:  Floating-point complex dot product
    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
    00074 void arm_cmplx_dot_prod_f32(
    00075   float32_t * pSrcA,
    00076   float32_t * pSrcB,
    00077   uint32_t numSamples,
    00078   float32_t * realResult,
    00079   float32_t * imagResult)
    00080 {
    00081   float32_t real_sum = 0.0f, imag_sum = 0.0f;    /* Temporary result storage */
    00082   uint32_t blkCnt;                               /* loop counter */
    00083
    00084   /*loop Unrolling */
    00085   blkCnt = numSamples >> 2u;
    00086
    00087   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00088    ** a second loop below computes the remaining 1 to 3 samples. */
    00089   while(blkCnt > 0u)
    00090   {
    00091     /* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */
    00092     real_sum += (*pSrcA++) * (*pSrcB++);
    00093     /* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */
    00094     imag_sum += (*pSrcA++) * (*pSrcB++);
    00095
    00096     real_sum += (*pSrcA++) * (*pSrcB++);
    00097     imag_sum += (*pSrcA++) * (*pSrcB++);
    00098
    00099     real_sum += (*pSrcA++) * (*pSrcB++);
    00100     imag_sum += (*pSrcA++) * (*pSrcB++);
    00101
    00102     real_sum += (*pSrcA++) * (*pSrcB++);
    00103     imag_sum += (*pSrcA++) * (*pSrcB++);
    00104
    00105     /* Decrement the loop counter */
    00106     blkCnt--;
    00107   }
    00108
    00109   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00110    ** No loop unrolling is used. */
    00111   blkCnt = numSamples % 0x4u;
    00112
    00113   while(blkCnt > 0u)
    00114   {
    00115     /* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */
    00116     real_sum += (*pSrcA++) * (*pSrcB++);
    00117     /* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */
    00118     imag_sum += (*pSrcA++) * (*pSrcB++);
    00119
    00120
    00121     /* Decrement the loop counter */
    00122     blkCnt--;
    00123   }
    00124
    00125   /* Store the real and imaginary results in the destination buffers */
    00126   *realResult = real_sum;
    00127   *imagResult = imag_sum;
    00128 }
    00129

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