lib/main/CMSIS/DSP/Source/SupportFunctions/arm_copy_q15.c

   1 /* ----------------------------------------------------------------------
   2  * Project:      CMSIS DSP Library
   3  * Title:        arm_copy_q15.c
   4  * Description:  Copies the elements of 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 copy
  37  * @{
  38  */
  39 /**
  40  * @brief Copies the elements of a Q15 vector.
  41  * @param[in]       *pSrc points to input vector
  42  * @param[out]      *pDst points to output vector
  43  * @param[in]       blockSize length of the input vector
  44  * @return none.
  45  *
  46  */
  47
  48 void arm_copy_q15(
  49   q15_t * pSrc,
  50   q15_t * pDst,
  51   uint32_t blockSize)
  52 {
  53   uint32_t blkCnt;                               /* loop counter */
  54
  55 #if defined (ARM_MATH_DSP)
  56
  57   /* Run the below code for Cortex-M4 and Cortex-M3 */
  58
  59   /*loop Unrolling */
  60   blkCnt = blockSize >> 2U;
  61
  62   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  63    ** a second loop below computes the remaining 1 to 3 samples. */
  64   while (blkCnt > 0U)
  65   {
  66     /* C = A */
  67     /* Read two inputs */
  68     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
  69     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
  70
  71     /* Decrement the loop counter */
  72     blkCnt--;
  73   }
  74
  75   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  76    ** No loop unrolling is used. */
  77   blkCnt = blockSize % 0x4U;
  78
  79
  80 #else
  81
  82   /* Run the below code for Cortex-M0 */
  83
  84   /* Loop over blockSize number of values */
  85   blkCnt = blockSize;
  86
  87 #endif /* #if defined (ARM_MATH_DSP) */
  88
  89   while (blkCnt > 0U)
  90   {
  91     /* C = A */
  92     /* Copy and then store the value in the destination buffer */
  93     *pDst++ = *pSrc++;
  94
  95     /* Decrement the loop counter */
  96     blkCnt--;
  97   }
  98 }
  99
 100 /**
 101  * @} end of BasicCopy group
 102  */