lib/main/CMSIS/DSP/Source/SupportFunctions/arm_fill_q31.c

   1 /* ----------------------------------------------------------------------
   2  * Project:      CMSIS DSP Library
   3  * Title:        arm_fill_q31.c
   4  * Description:  Fills a constant value into a Q31 vector
   5  *
   6  * $Date:        27. January 2017
   7  * $Revision:    V.1.5.1
   8  *
   9  * Target Processor: Cortex-M cores
  10  * -------------------------------------------------------------------- */
  11 /*
  12  * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
  13  *
  14  * SPDX-License-Identifier: Apache-2.0
  15  *
  16  * Licensed under the Apache License, Version 2.0 (the License); you may
  17  * not use this file except in compliance with the License.
  18  * You may obtain a copy of the License at
  19  *
  20  * www.apache.org/licenses/LICENSE-2.0
  21  *
  22  * Unless required by applicable law or agreed to in writing, software
  23  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
  24  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  25  * See the License for the specific language governing permissions and
  26  * limitations under the License.
  27  */
  28
  29 #include "arm_math.h"
  30
  31 /**
  32  * @ingroup groupSupport
  33  */
  34
  35 /**
  36  * @addtogroup Fill
  37  * @{
  38  */
  39
  40 /**
  41  * @brief Fills a constant value into a Q31 vector.
  42  * @param[in]       value input value to be filled
  43  * @param[out]      *pDst points to output vector
  44  * @param[in]       blockSize length of the output vector
  45  * @return none.
  46  *
  47  */
  48
  49 void arm_fill_q31(
  50   q31_t value,
  51   q31_t * pDst,
  52   uint32_t blockSize)
  53 {
  54   uint32_t blkCnt;                               /* loop counter */
  55
  56
  57 #if defined (ARM_MATH_DSP)
  58
  59   /* Run the below code for Cortex-M4 and Cortex-M3 */
  60   q31_t in1 = value;
  61   q31_t in2 = value;
  62   q31_t in3 = value;
  63   q31_t in4 = value;
  64
  65   /*loop Unrolling */
  66   blkCnt = blockSize >> 2U;
  67
  68   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  69    ** a second loop below computes the remaining 1 to 3 samples. */
  70   while (blkCnt > 0U)
  71   {
  72     /* C = value */
  73     /* Fill the value in the destination buffer */
  74     *pDst++ = in1;
  75     *pDst++ = in2;
  76     *pDst++ = in3;
  77     *pDst++ = in4;
  78
  79     /* Decrement the loop counter */
  80     blkCnt--;
  81   }
  82
  83   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  84    ** No loop unrolling is used. */
  85   blkCnt = blockSize % 0x4U;
  86
  87 #else
  88
  89   /* Run the below code for Cortex-M0 */
  90
  91   /* Loop over blockSize number of values */
  92   blkCnt = blockSize;
  93
  94 #endif /* #if defined (ARM_MATH_DSP) */
  95
  96   while (blkCnt > 0U)
  97   {
  98     /* C = value */
  99     /* Fill the value in the destination buffer */
 100     *pDst++ = value;
 101
 102     /* Decrement the loop counter */
 103     blkCnt--;
 104   }
 105 }
 106
 107 /**
 108  * @} end of Fill group
 109  */