lib/main/CMSIS/DSP/Source/SupportFunctions/arm_fill_q7.c

   1 /* ----------------------------------------------------------------------
   2  * Project:      CMSIS DSP Library
   3  * Title:        arm_fill_q7.c
   4  * Description:  Fills a constant value into a Q7 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 Q7 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_q7(
  50   q7_t value,
  51   q7_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   /*loop Unrolling */
  63   blkCnt = blockSize >> 2U;
  64
  65   /* Packing four 8 bit values to 32 bit value in order to use SIMD */
  66   packedValue = __PACKq7(value, value, value, value);
  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     *__SIMD32(pDst)++ = packedValue;
  75
  76     /* Decrement the loop counter */
  77     blkCnt--;
  78   }
  79
  80   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  81    ** No loop unrolling is used. */
  82   blkCnt = blockSize % 0x4U;
  83
  84 #else
  85
  86   /* Run the below code for Cortex-M0 */
  87
  88   /* Loop over blockSize number of values */
  89   blkCnt = blockSize;
  90
  91 #endif /* #if defined (ARM_MATH_DSP) */
  92
  93   while (blkCnt > 0U)
  94   {
  95     /* C = value */
  96     /* Fill the value in the destination buffer */
  97     *pDst++ = value;
  98
  99     /* Decrement the loop counter */
 100     blkCnt--;
 101   }
 102 }
 103
 104 /**
 105  * @} end of Fill group
 106  */