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# arm_copy_q15.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_copy_q15.c
    00009 *
    00010 * Description:  Processing function for the Q15 copy
    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 * Version 0.0.7  2010/06/10
    00027 *    Misra-C changes done
    00028 * -------------------------------------------------------------------- */
    00029
    00030 #include "arm_math.h"
    00031
    00049 void arm_copy_q15(
    00050   q15_t * pSrc,
    00051   q15_t * pDst,
    00052   uint32_t blockSize)
    00053 {
    00054   uint32_t blkCnt;                               /* loop counter */
    00055   q15_t in1, in2;                                /* Temporary variables */
    00056
    00057
    00058   /*loop Unrolling */
    00059   blkCnt = blockSize >> 2u;
    00060
    00061   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00062    ** a second loop below computes the remaining 1 to 3 samples. */
    00063   while(blkCnt > 0u)
    00064   {
    00065     /* C = A */
    00066     /* Read two inputs */
    00067     in1 = *pSrc++;
    00068     in2 = *pSrc++;
    00069     /* Store the values in the destination buffer by packing the two inputs */
    00070     *__SIMD32(pDst)++ = __PKHBT(in1, in2, 16);
    00071
    00072     in1 = *pSrc++;
    00073     in2 = *pSrc++;
    00074     *__SIMD32(pDst)++ = __PKHBT(in1, in2, 16);
    00075
    00076     /* Decrement the loop counter */
    00077     blkCnt--;
    00078   }
    00079
    00080   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00081    ** No loop unrolling is used. */
    00082   blkCnt = blockSize % 0x4u;
    00083
    00084   while(blkCnt > 0u)
    00085   {
    00086     /* C = A */
    00087     /* Copy and then store the value in the destination buffer */
    00088     *pDst++ = *pSrc++;
    00089
    00090     /* Decrement the loop counter */
    00091     blkCnt--;
    00092   }
    00093 }
    00094

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