CMSIS DSP Software Library: arm_cmplx_conj_f32.c Source File

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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:        15. July 2011
    00005 * $Revision:    V1.0.10
    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/Cortex-M0
    00013 *
    00014 * Version 1.0.10 2011/7/15
    00015 *    Big Endian support added and Merged M0 and M3/M4 Source code.
    00016 *
    00017 * Version 1.0.3 2010/11/29
    00018 *    Re-organized the CMSIS folders and updated documentation.
    00019 *
    00020 * Version 1.0.2 2010/11/11
    00021 *    Documentation updated.
    00022 *
    00023 * Version 1.0.1 2010/10/05
    00024 *    Production release and review comments incorporated.
    00025 *
    00026 * Version 1.0.0 2010/09/20
    00027 *    Production release and review comments incorporated.
    00028 * ---------------------------------------------------------------------------- */
    00029
    00030 #include "arm_math.h"
    00031
    00072 void arm_cmplx_conj_f32(
    00073   float32_t * pSrc,
    00074   float32_t * pDst,
    00075   uint32_t numSamples)
    00076 {
    00077
    00078 #ifndef ARM_MATH_CM0
    00079
    00080   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00081   uint32_t blkCnt;                               /* loop counter */
    00082
    00083   /*loop Unrolling */
    00084   blkCnt = numSamples >> 2u;
    00085
    00086   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00087    ** a second loop below computes the remaining 1 to 3 samples. */
    00088   while(blkCnt > 0u)
    00089   {
    00090     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00091     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00092     *pDst++ = *pSrc++;
    00093     *pDst++ = -*pSrc++;
    00094     *pDst++ = *pSrc++;
    00095     *pDst++ = -*pSrc++;
    00096     *pDst++ = *pSrc++;
    00097     *pDst++ = -*pSrc++;
    00098     *pDst++ = *pSrc++;
    00099     *pDst++ = -*pSrc++;
    00100
    00101     /* Decrement the loop counter */
    00102     blkCnt--;
    00103   }
    00104
    00105   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00106    ** No loop unrolling is used. */
    00107   blkCnt = numSamples % 0x4u;
    00108
    00109   while(blkCnt > 0u)
    00110   {
    00111     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00112     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00113     *pDst++ = *pSrc++;
    00114     *pDst++ = -*pSrc++;
    00115
    00116     /* Decrement the loop counter */
    00117     blkCnt--;
    00118   }
    00119
    00120 #else
    00121
    00122   /* Run the below code for Cortex-M0 */
    00123
    00124   while(numSamples > 0u)
    00125   {
    00126     /* realOut + j (imagOut) = realIn + j (-1) imagIn */
    00127     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00128     *pDst++ = *pSrc++;
    00129     *pDst++ = -*pSrc++;
    00130
    00131     /* Decrement the loop counter */
    00132     numSamples--;
    00133   }
    00134
    00135 #endif /* #ifndef ARM_MATH_CM0 */
    00136
    00137 }
    00138

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