CMSIS DSP Software Library: arm_cmplx_conj_q31.c Source File

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# arm_cmplx_conj_q31.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_q31.c
    00009 *
    00010 * Description:  Q31 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_q31(
    00055   q31_t * pSrc,
    00056   q31_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   q31_t in;                                      /* Input value */
    00065
    00066   /*loop Unrolling */
    00067   blkCnt = numSamples >> 2u;
    00068
    00069   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00070    ** a second loop below computes the remaining 1 to 3 samples. */
    00071   while(blkCnt > 0u)
    00072   {
    00073     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00074     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00075     /* Saturated to 0x7fffffff if the input is -1(0x80000000) */
    00076     *pDst++ = *pSrc++;
    00077     in = *pSrc++;
    00078     *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
    00079     *pDst++ = *pSrc++;
    00080     in = *pSrc++;
    00081     *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
    00082     *pDst++ = *pSrc++;
    00083     in = *pSrc++;
    00084     *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
    00085     *pDst++ = *pSrc++;
    00086     in = *pSrc++;
    00087     *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
    00088
    00089     /* Decrement the loop counter */
    00090     blkCnt--;
    00091   }
    00092
    00093   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00094    ** No loop unrolling is used. */
    00095   blkCnt = numSamples % 0x4u;
    00096
    00097   while(blkCnt > 0u)
    00098   {
    00099     /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
    00100     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00101     /* Saturated to 0x7fffffff if the input is -1(0x80000000) */
    00102     *pDst++ = *pSrc++;
    00103     in = *pSrc++;
    00104     *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
    00105
    00106     /* Decrement the loop counter */
    00107     blkCnt--;
    00108   }
    00109
    00110 #else
    00111
    00112   /* Run the below code for Cortex-M0 */
    00113
    00114   while(numSamples > 0u)
    00115   {
    00116     /* realOut + j (imagOut) = realIn+ j (-1) imagIn */
    00117     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
    00118     *pDst++ = *pSrc++;
    00119     *pDst++ = -*pSrc++;
    00120
    00121     /* Decrement the loop counter */
    00122     numSamples--;
    00123   }
    00124
    00125 #endif /* #ifndef ARM_MATH_CM0 */
    00126
    00127 }
    00128

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