CMSIS DSP Software Library: arm_cmplx_conj_q15.c Source File

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# arm_cmplx_conj_q15.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_q15.c
    00009 *
    00010 * Description:  Q15 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
    00054 void arm_cmplx_conj_q15(
    00055   q15_t * pSrc,
    00056   q15_t * pDst,
    00057   uint32_t numSamples)
    00058 {
    00059
    00060 #ifndef ARM_MATH_CM0
    00061
    00062   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00063   uint32_t blkCnt;                               /* loop counter */
    00064
    00065   /*loop Unrolling */
    00066   blkCnt = numSamples >> 2u;
    00067
    00068   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00069    ** a second loop below computes the remaining 1 to 3 samples. */
    00070   while(blkCnt > 0u)
    00071   {
    00072     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00073     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00074     *pDst++ = *pSrc++;
    00075     *pDst++ = __SSAT(-*pSrc++, 16);
    00076     *pDst++ = *pSrc++;
    00077     *pDst++ = __SSAT(-*pSrc++, 16);
    00078     *pDst++ = *pSrc++;
    00079     *pDst++ = __SSAT(-*pSrc++, 16);
    00080     *pDst++ = *pSrc++;
    00081     *pDst++ = __SSAT(-*pSrc++, 16);
    00082
    00083     /* Decrement the loop counter */
    00084     blkCnt--;
    00085   }
    00086
    00087   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00088    ** No loop unrolling is used. */
    00089   blkCnt = numSamples % 0x4u;
    00090
    00091   while(blkCnt > 0u)
    00092   {
    00093     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00094     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00095     *pDst++ = *pSrc++;
    00096     *pDst++ = __SSAT(-*pSrc++, 16);
    00097
    00098     /* Decrement the loop counter */
    00099     blkCnt--;
    00100   }
    00101
    00102 #else
    00103
    00104   /* Run the below code for Cortex-M0 */
    00105
    00106   while(numSamples > 0u)
    00107   {
    00108     /* realOut + j (imagOut) = realIn+ j (-1) imagIn */
    00109     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00110     *pDst++ = *pSrc++;
    00111     *pDst++ = -*pSrc++;
    00112
    00113     /* Decrement the loop counter */
    00114     numSamples--;
    00115   }
    00116
    00117 #endif /* #ifndef ARM_MATH_CM0 */
    00118
    00119 }
    00120

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