CMSIS DSP Software Library: arm_fill_q7.c Source File

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# arm_fill_q7.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_q7.c
    00009 *
    00010 * Description:  Fills a constant value into a Q7 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_q7(
    00054   q7_t value,
    00055   q7_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   /*loop Unrolling */
    00067   blkCnt = blockSize >> 2u;
    00068
    00069   /* Packing four 8 bit values to 32 bit value in order to use SIMD */
    00070   packedValue = __PACKq7(value, value, value, value);
    00071
    00072   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00073    ** a second loop below computes the remaining 1 to 3 samples. */
    00074   while(blkCnt > 0u)
    00075   {
    00076     /* C = value */
    00077     /* Fill the value in the destination buffer */
    00078     *__SIMD32(pDst)++ = packedValue;
    00079
    00080     /* Decrement the loop counter */
    00081     blkCnt--;
    00082   }
    00083
    00084   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00085    ** No loop unrolling is used. */
    00086   blkCnt = blockSize % 0x4u;
    00087
    00088 #else
    00089
    00090   /* Run the below code for Cortex-M0 */
    00091
    00092   /* Loop over blockSize number of values */
    00093   blkCnt = blockSize;
    00094
    00095 #endif /* #ifndef ARM_MATH_CM0 */
    00096
    00097   while(blkCnt > 0u)
    00098   {
    00099     /* C = value */
    00100     /* Fill the value in the destination buffer */
    00101     *pDst++ = value;
    00102
    00103     /* Decrement the loop counter */
    00104     blkCnt--;
    00105   }
    00106 }
    00107

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