lib/main/CMSIS/DSP/Source/SupportFunctions/arm_copy_q31.c

   1 /* ----------------------------------------------------------------------
   2  * Project:      CMSIS DSP Library
   3  * Title:        arm_copy_q31.c
   4  * Description:  Copies the elements of 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 copy
  37  * @{
  38  */
  39
  40 /**
  41  * @brief Copies the elements of a Q31 vector.
  42  * @param[in]       *pSrc points to input vector
  43  * @param[out]      *pDst points to output vector
  44  * @param[in]       blockSize length of the input vector
  45  * @return none.
  46  *
  47  */
  48
  49 void arm_copy_q31(
  50   q31_t * pSrc,
  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, in2, in3, in4;
  61
  62   /*loop Unrolling */
  63   blkCnt = blockSize >> 2U;
  64
  65   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  66    ** a second loop below computes the remaining 1 to 3 samples. */
  67   while (blkCnt > 0U)
  68   {
  69     /* C = A */
  70     /* Copy and then store the values in the destination buffer */
  71     in1 = *pSrc++;
  72     in2 = *pSrc++;
  73     in3 = *pSrc++;
  74     in4 = *pSrc++;
  75
  76     *pDst++ = in1;
  77     *pDst++ = in2;
  78     *pDst++ = in3;
  79     *pDst++ = in4;
  80
  81     /* Decrement the loop counter */
  82     blkCnt--;
  83   }
  84
  85   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  86    ** No loop unrolling is used. */
  87   blkCnt = blockSize % 0x4U;
  88
  89 #else
  90
  91   /* Run the below code for Cortex-M0 */
  92
  93   /* Loop over blockSize number of values */
  94   blkCnt = blockSize;
  95
  96 #endif /* #if defined (ARM_MATH_DSP) */
  97
  98   while (blkCnt > 0U)
  99   {
 100     /* C = A */
 101     /* Copy and then store the value in the destination buffer */
 102     *pDst++ = *pSrc++;
 103
 104     /* Decrement the loop counter */
 105     blkCnt--;
 106   }
 107 }
 108
 109 /**
 110  * @} end of BasicCopy group
 111  */