arm_copy_q15.c

00001 /* ----------------------------------------------------------------------
00002  * Project:      CMSIS DSP Library
00003  * Title:        arm_copy_q15.c
00004  * Description:  Copies the elements of a Q15 vector
00005  *
00006  * $Date:        27. January 2017
00007  * $Revision:    V.1.5.1
00008  *
00009  * Target Processor: Cortex-M cores
00010  * -------------------------------------------------------------------- */
00011 /*
00012  * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
00013  *
00014  * SPDX-License-Identifier: Apache-2.0
00015  *
00016  * Licensed under the Apache License, Version 2.0 (the License); you may
00017  * not use this file except in compliance with the License.
00018  * You may obtain a copy of the License at
00019  *
00020  * www.apache.org/licenses/LICENSE-2.0
00021  *
00022  * Unless required by applicable law or agreed to in writing, software
00023  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
00024  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00025  * See the License for the specific language governing permissions and
00026  * limitations under the License.
00027  */
00028 
00029 #include "arm_math.h"
00030 
00031 /**
00032  * @ingroup groupSupport
00033  */
00034 
00035 /**
00036  * @addtogroup copy
00037  * @{
00038  */
00039 /**
00040  * @brief Copies the elements of a Q15 vector.
00041  * @param[in]       *pSrc points to input vector
00042  * @param[out]      *pDst points to output vector
00043  * @param[in]       blockSize length of the input vector
00044  * @return none.
00045  *
00046  */
00047 
00048 void arm_copy_q15(
00049   q15_t * pSrc,
00050   q15_t * pDst,
00051   uint32_t blockSize)
00052 {
00053   uint32_t blkCnt;                               /* loop counter */
00054 
00055 #if defined (ARM_MATH_DSP)
00056 
00057   /* Run the below code for Cortex-M4 and Cortex-M3 */
00058 
00059   /*loop Unrolling */
00060   blkCnt = blockSize >> 2U;
00061 
00062   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
00063    ** a second loop below computes the remaining 1 to 3 samples. */
00064   while (blkCnt > 0U)
00065   {
00066     /* C = A */
00067     /* Read two inputs */
00068     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
00069     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
00070 
00071     /* Decrement the loop counter */
00072     blkCnt--;
00073   }
00074 
00075   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
00076    ** No loop unrolling is used. */
00077   blkCnt = blockSize % 0x4U;
00078 
00079 
00080 #else
00081 
00082   /* Run the below code for Cortex-M0 */
00083 
00084   /* Loop over blockSize number of values */
00085   blkCnt = blockSize;
00086 
00087 #endif /* #if defined (ARM_MATH_DSP) */
00088 
00089   while (blkCnt > 0U)
00090   {
00091     /* C = A */
00092     /* Copy and then store the value in the destination buffer */
00093     *pDst++ = *pSrc++;
00094 
00095     /* Decrement the loop counter */
00096     blkCnt--;
00097   }
00098 }
00099 
00100 /**
00101  * @} end of BasicCopy group
00102  */
00103