tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/SupportFunctions/arm_fill_f32.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_f32.c
   9 *
  10 * Description:  Fills a constant value into a floating-point 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  * @defgroup Fill Vector Fill
  49  *
  50  * Fills the destination vector with a constant value.
  51  *
  52  * <pre>
  53  *      pDst[n] = value;   0 <= n < blockSize.
  54  * </pre>
  55  *
  56  * There are separate functions for floating point, Q31, Q15, and Q7 data types.
  57  */
  58
  59 /**
  60  * @addtogroup Fill
  61  * @{
  62  */
  63
  64 /**
  65  * @brief Fills a constant value into a floating-point vector.
  66  * @param[in]       value input value to be filled
  67  * @param[out]      *pDst points to output vector
  68  * @param[in]       blockSize length of the output vector
  69  * @return none.
  70  *
  71  */
  72
  73
  74 void arm_fill_f32(
  75   float32_t value,
  76   float32_t * pDst,
  77   uint32_t blockSize)
  78 {
  79   uint32_t blkCnt;                               /* loop counter */
  80
  81 #ifndef ARM_MATH_CM0_FAMILY
  82
  83   /* Run the below code for Cortex-M4 and Cortex-M3 */
  84   float32_t in1 = value;
  85   float32_t in2 = value;
  86   float32_t in3 = value;
  87   float32_t in4 = value;
  88
  89   /*loop Unrolling */
  90   blkCnt = blockSize >> 2u;
  91
  92   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  93    ** a second loop below computes the remaining 1 to 3 samples. */
  94   while(blkCnt > 0u)
  95   {
  96     /* C = value */
  97     /* Fill the value in the destination buffer */
  98     *pDst++ = in1;
  99     *pDst++ = in2;
 100     *pDst++ = in3;
 101     *pDst++ = in4;
 102
 103     /* Decrement the loop counter */
 104     blkCnt--;
 105   }
 106
 107   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
 108    ** No loop unrolling is used. */
 109   blkCnt = blockSize % 0x4u;
 110
 111 #else
 112
 113   /* Run the below code for Cortex-M0 */
 114
 115   /* Loop over blockSize number of values */
 116   blkCnt = blockSize;
 117
 118 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
 119
 120
 121   while(blkCnt > 0u)
 122   {
 123     /* C = value */
 124     /* Fill the value in the destination buffer */
 125     *pDst++ = value;
 126
 127     /* Decrement the loop counter */
 128     blkCnt--;
 129   }
 130 }
 131
 132 /**
 133  * @} end of Fill group
 134  */