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# arm_add_q31.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_add_q31.c
    00009 *
    00010 * Description:  Q31 vector addition.
    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
    00056 void arm_add_q31(
    00057   q31_t * pSrcA,
    00058   q31_t * pSrcB,
    00059   q31_t * pDst,
    00060   uint32_t blockSize)
    00061 {
    00062   uint32_t blkCnt;                               /* loop counter */
    00063
    00064
    00065   /*loop Unrolling */
    00066   blkCnt = blockSize >> 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 = A + B */
    00073     /* Add and then store the results in the destination buffer. */
    00074     *pDst++ = __QADD(*pSrcA++, *pSrcB++);
    00075     *pDst++ = __QADD(*pSrcA++, *pSrcB++);
    00076     *pDst++ = __QADD(*pSrcA++, *pSrcB++);
    00077     *pDst++ = __QADD(*pSrcA++, *pSrcB++);
    00078
    00079     /* Decrement the loop counter */
    00080     blkCnt--;
    00081   }
    00082
    00083   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00084    ** No loop unrolling is used. */
    00085   blkCnt = blockSize % 0x4u;
    00086
    00087   while(blkCnt > 0u)
    00088   {
    00089     /* C = A + B */
    00090     /* Add and then store the results in the destination buffer. */
    00091     *pDst++ = __QADD(*pSrcA++, *pSrcB++);
    00092
    00093     /* Decrement the loop counter */
    00094     blkCnt--;
    00095   }
    00096 }
    00097

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