CMSIS DSP Software Library: arm_fill_q15.c Source File

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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:        15. July 2011
    00005 * $Revision:    V1.0.10
    00006 *
    00007 * Project:      CMSIS DSP Library
    00008 * Title:        arm_fill_q15.c
    00009 *
    00010 * Description:  Fills a constant value into a Q15 vector.
    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 * Version 0.0.7  2010/06/10
    00030 *    Misra-C changes done
    00031 * -------------------------------------------------------------------- */
    00032
    00033 #include "arm_math.h"
    00034
    00053 void arm_fill_q15(
    00054   q15_t value,
    00055   q15_t * pDst,
    00056   uint32_t blockSize)
    00057 {
    00058   uint32_t blkCnt;                               /* loop counter */
    00059
    00060 #ifndef ARM_MATH_CM0
    00061
    00062   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00063
    00064   q31_t packedValue;                             /* value packed to 32 bits */
    00065
    00066
    00067   /*loop Unrolling */
    00068   blkCnt = blockSize >> 2u;
    00069
    00070   /* Packing two 16 bit values to 32 bit value in order to use SIMD */
    00071   packedValue = __PKHBT(value, value, 16u);
    00072
    00073   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00074    ** a second loop below computes the remaining 1 to 3 samples. */
    00075   while(blkCnt > 0u)
    00076   {
    00077     /* C = value */
    00078     /* Fill the value in the destination buffer */
    00079     *__SIMD32(pDst)++ = packedValue;
    00080     *__SIMD32(pDst)++ = packedValue;
    00081
    00082     /* Decrement the loop counter */
    00083     blkCnt--;
    00084   }
    00085
    00086   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00087    ** No loop unrolling is used. */
    00088   blkCnt = blockSize % 0x4u;
    00089
    00090 #else
    00091
    00092   /* Run the below code for Cortex-M0 */
    00093
    00094   /* Loop over blockSize number of values */
    00095   blkCnt = blockSize;
    00096
    00097 #endif /* #ifndef ARM_MATH_CM0 */
    00098
    00099   while(blkCnt > 0u)
    00100   {
    00101     /* C = value */
    00102     /* Fill the value in the destination buffer */
    00103     *pDst++ = value;
    00104
    00105     /* Decrement the loop counter */
    00106     blkCnt--;
    00107   }
    00108 }
    00109

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