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# arm_fill_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_fill_q15.c
    00009 *
    00010 * Description:  Processing function for the Q15 fill
    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
    00050 void arm_fill_q15(
    00051   q15_t value,
    00052   q15_t * pDst,
    00053   uint32_t blockSize)
    00054 {
    00055   uint32_t blkCnt;                               /* loop counter */
    00056   q31_t packedValue;                             /* value packed to 32 bits */
    00057
    00058
    00059   /*loop Unrolling */
    00060   blkCnt = blockSize >> 2u;
    00061
    00062   /* Packing two 16 bit values to 32 bit value in order to use SIMD */
    00063   packedValue = __PKHBT(value, value, 16u);
    00064
    00065   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00066    ** a second loop below computes the remaining 1 to 3 samples. */
    00067   while(blkCnt > 0u)
    00068   {
    00069     /* C = value */
    00070     /* Fill the value in the destination buffer */
    00071     *__SIMD32(pDst)++ = packedValue;
    00072     *__SIMD32(pDst)++ = packedValue;
    00073
    00074     /* Decrement the loop counter */
    00075     blkCnt--;
    00076   }
    00077
    00078   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00079    ** No loop unrolling is used. */
    00080   blkCnt = blockSize % 0x4u;
    00081
    00082   while(blkCnt > 0u)
    00083   {
    00084     /* C = value */
    00085     /* Fill the value in the destination buffer */
    00086     *pDst++ = value;
    00087
    00088     /* Decrement the loop counter */
    00089     blkCnt--;
    00090   }
    00091 }
    00092

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