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  1. /* ----------------------------------------------------------------------
  2.  * Project:      CMSIS DSP Library
  3.  * Title:        arm_fill_f32.c
  4.  * Description:  Fills a constant value into a floating-point 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.  * @defgroup Fill Vector Fill
  37.  *
  38.  * Fills the destination vector with a constant value.
  39.  *
  40.  * <pre>
  41.  *      pDst[n] = value;   0 <= n < blockSize.
  42.  * </pre>
  43.  *
  44.  * There are separate functions for floating point, Q31, Q15, and Q7 data types.
  45.  */
  46.  
  47. /**
  48.  * @addtogroup Fill
  49.  * @{
  50.  */
  51.  
  52. /**
  53.  * @brief Fills a constant value into a floating-point 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.  
  62. void arm_fill_f32(
  63.   float32_t value,
  64.   float32_t * pDst,
  65.   uint32_t blockSize)
  66. {
  67.   uint32_t blkCnt;                               /* loop counter */
  68.  
  69. #if defined (ARM_MATH_DSP)
  70.  
  71.   /* Run the below code for Cortex-M4 and Cortex-M3 */
  72.   float32_t in1 = value;
  73.   float32_t in2 = value;
  74.   float32_t in3 = value;
  75.   float32_t in4 = value;
  76.  
  77.   /*loop Unrolling */
  78.   blkCnt = blockSize >> 2U;
  79.  
  80.   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  81.    ** a second loop below computes the remaining 1 to 3 samples. */
  82.   while (blkCnt > 0U)
  83.   {
  84.     /* C = value */
  85.     /* Fill the value in the destination buffer */
  86.     *pDst++ = in1;
  87.     *pDst++ = in2;
  88.     *pDst++ = in3;
  89.     *pDst++ = in4;
  90.  
  91.     /* Decrement the loop counter */
  92.     blkCnt--;
  93.   }
  94.  
  95.   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  96.    ** No loop unrolling is used. */
  97.   blkCnt = blockSize % 0x4U;
  98.  
  99. #else
  100.  
  101.   /* Run the below code for Cortex-M0 */
  102.  
  103.   /* Loop over blockSize number of values */
  104.   blkCnt = blockSize;
  105.  
  106. #endif /* #if defined (ARM_MATH_DSP) */
  107.  
  108.  
  109.   while (blkCnt > 0U)
  110.   {
  111.     /* C = value */
  112.     /* Fill the value in the destination buffer */
  113.     *pDst++ = value;
  114.  
  115.     /* Decrement the loop counter */
  116.     blkCnt--;
  117.   }
  118. }
  119.  
  120. /**
  121.  * @} end of Fill group
  122.  */
  123.