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  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.  */
  103.