tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/SupportFunctions/arm_fill_q15.c

   1 /* ----------------------------------------------------------------------
   2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
   3 *
   4 * $Date:        17. January 2013
   5 * $Revision:    V1.4.1
   6 *
   7 * Project:          CMSIS DSP Library
   8 * Title:                arm_fill_q15.c
   9 *
  10 * Description:  Fills a constant value into a Q15 vector.
  11 *
  12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
  13 *
  14 * Redistribution and use in source and binary forms, with or without
  15 * modification, are permitted provided that the following conditions
  16 * are met:
  17 *   - Redistributions of source code must retain the above copyright
  18 *     notice, this list of conditions and the following disclaimer.
  19 *   - Redistributions in binary form must reproduce the above copyright
  20 *     notice, this list of conditions and the following disclaimer in
  21 *     the documentation and/or other materials provided with the
  22 *     distribution.
  23 *   - Neither the name of ARM LIMITED nor the names of its contributors
  24 *     may be used to endorse or promote products derived from this
  25 *     software without specific prior written permission.
  26 *
  27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38 * POSSIBILITY OF SUCH DAMAGE.
  39 * -------------------------------------------------------------------- */
  40
  41 #include "arm_math.h"
  42
  43 /**
  44  * @ingroup groupSupport
  45  */
  46
  47 /**
  48  * @addtogroup Fill
  49  * @{
  50  */
  51
  52 /**
  53  * @brief Fills a constant value into a Q15 vector.
  54  * @param[in]       value input value to be filled
  55  * @param[out]      *pDst points to output vector
  56  * @param[in]       blockSize length of the output vector
  57  * @return none.
  58  *
  59  */
  60
  61 void arm_fill_q15(
  62   q15_t value,
  63   q15_t * pDst,
  64   uint32_t blockSize)
  65 {
  66   uint32_t blkCnt;                               /* loop counter */
  67
  68 #ifndef ARM_MATH_CM0_FAMILY
  69
  70   /* Run the below code for Cortex-M4 and Cortex-M3 */
  71
  72   q31_t packedValue;                             /* value packed to 32 bits */
  73
  74
  75   /*loop Unrolling */
  76   blkCnt = blockSize >> 2u;
  77
  78   /* Packing two 16 bit values to 32 bit value in order to use SIMD */
  79   packedValue = __PKHBT(value, value, 16u);
  80
  81   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  82    ** a second loop below computes the remaining 1 to 3 samples. */
  83   while(blkCnt > 0u)
  84   {
  85     /* C = value */
  86     /* Fill the value in the destination buffer */
  87     *__SIMD32(pDst)++ = packedValue;
  88     *__SIMD32(pDst)++ = packedValue;
  89
  90     /* Decrement the loop counter */
  91     blkCnt--;
  92   }
  93
  94   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  95    ** No loop unrolling is used. */
  96   blkCnt = blockSize % 0x4u;
  97
  98 #else
  99
 100   /* Run the below code for Cortex-M0 */
 101
 102   /* Loop over blockSize number of values */
 103   blkCnt = blockSize;
 104
 105 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
 106
 107   while(blkCnt > 0u)
 108   {
 109     /* C = value */
 110     /* Fill the value in the destination buffer */
 111     *pDst++ = value;
 112
 113     /* Decrement the loop counter */
 114     blkCnt--;
 115   }
 116 }
 117
 118 /**
 119  * @} end of Fill group
 120  */