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# arm_cmplx_conj_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_conj_f32.c
    00009 *
    00010 * Description:  Floating-point complex conjugate.
    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
    00069 void arm_cmplx_conj_f32(
    00070   float32_t * pSrc,
    00071   float32_t * pDst,
    00072   uint32_t numSamples)
    00073 {
    00074   uint32_t blkCnt;                               /* loop counter */
    00075
    00076   /*loop Unrolling */
    00077   blkCnt = numSamples >> 2u;
    00078
    00079   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00080    ** a second loop below computes the remaining 1 to 3 samples. */
    00081   while(blkCnt > 0u)
    00082   {
    00083     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00084     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00085     *pDst++ = *pSrc++;
    00086     *pDst++ = -*pSrc++;
    00087     *pDst++ = *pSrc++;
    00088     *pDst++ = -*pSrc++;
    00089     *pDst++ = *pSrc++;
    00090     *pDst++ = -*pSrc++;
    00091     *pDst++ = *pSrc++;
    00092     *pDst++ = -*pSrc++;
    00093
    00094     /* Decrement the loop counter */
    00095     blkCnt--;
    00096   }
    00097
    00098   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00099    ** No loop unrolling is used. */
    00100   blkCnt = numSamples % 0x4u;
    00101
    00102   while(blkCnt > 0u)
    00103   {
    00104     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00105     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00106     *pDst++ = *pSrc++;
    00107     *pDst++ = -*pSrc++;
    00108
    00109     /* Decrement the loop counter */
    00110     blkCnt--;
    00111   }
    00112 }
    00113

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