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  1. /* ----------------------------------------------------------------------
  2.  * Project:      CMSIS DSP Library
  3.  * Title:        arm_fill_q15.c
  4.  * Description:  Fills a constant value into a Q15 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 Q15 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_q15(
  50.   q15_t value,
  51.   q15_t * pDst,
  52.   uint32_t blockSize)
  53. {
  54.   uint32_t blkCnt;                               /* loop counter */
  55.  
  56. #if defined (ARM_MATH_DSP)
  57.  
  58.   /* Run the below code for Cortex-M4 and Cortex-M3 */
  59.  
  60.   q31_t packedValue;                             /* value packed to 32 bits */
  61.  
  62.  
  63.   /*loop Unrolling */
  64.   blkCnt = blockSize >> 2U;
  65.  
  66.   /* Packing two 16 bit values to 32 bit value in order to use SIMD */
  67.   packedValue = __PKHBT(value, value, 16U);
  68.  
  69.   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  70.    ** a second loop below computes the remaining 1 to 3 samples. */
  71.   while (blkCnt > 0U)
  72.   {
  73.     /* C = value */
  74.     /* Fill the value in the destination buffer */
  75.     *__SIMD32(pDst)++ = packedValue;
  76.     *__SIMD32(pDst)++ = packedValue;
  77.  
  78.     /* Decrement the loop counter */
  79.     blkCnt--;
  80.   }
  81.  
  82.   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  83.    ** No loop unrolling is used. */
  84.   blkCnt = blockSize % 0x4U;
  85.  
  86. #else
  87.  
  88.   /* Run the below code for Cortex-M0 */
  89.  
  90.   /* Loop over blockSize number of values */
  91.   blkCnt = blockSize;
  92.  
  93. #endif /* #if defined (ARM_MATH_DSP) */
  94.  
  95.   while (blkCnt > 0U)
  96.   {
  97.     /* C = value */
  98.     /* Fill the value in the destination buffer */
  99.     *pDst++ = value;
  100.  
  101.     /* Decrement the loop counter */
  102.     blkCnt--;
  103.   }
  104. }
  105.  
  106. /**
  107.  * @} end of Fill group
  108.  */
  109.