arm_copy_q15.c

00001 /* ----------------------------------------------------------------------    
00002 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.    
00003 *    
00004 * $Date:        19. March 2015
00005 * $Revision:    V.1.4.5  
00006 *    
00007 * Project:      CMSIS DSP Library    
00008 * Title:        arm_copy_q15.c    
00009 *    
00010 * Description:  Copies the elements of a Q15 vector.   
00011 *    
00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
00013 *  
00014 * Redistribution and use in source and binary forms, with or without 
00015 * modification, are permitted provided that the following conditions
00016 * are met:
00017 *   - Redistributions of source code must retain the above copyright
00018 *     notice, this list of conditions and the following disclaimer.
00019 *   - Redistributions in binary form must reproduce the above copyright
00020 *     notice, this list of conditions and the following disclaimer in
00021 *     the documentation and/or other materials provided with the 
00022 *     distribution.
00023 *   - Neither the name of ARM LIMITED nor the names of its contributors
00024 *     may be used to endorse or promote products derived from this
00025 *     software without specific prior written permission.
00026 *
00027 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00028 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00029 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00030 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
00031 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00032 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00033 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00034 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00035 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00036 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
00037 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00038 * POSSIBILITY OF SUCH DAMAGE.   
00039 * -------------------------------------------------------------------- */
00040 
00041 #include "arm_math.h"
00042 
00043 /**    
00044  * @ingroup groupSupport    
00045  */
00046 
00047 /**    
00048  * @addtogroup copy    
00049  * @{    
00050  */
00051 /**    
00052  * @brief Copies the elements of a Q15 vector.     
00053  * @param[in]       *pSrc points to input vector    
00054  * @param[out]      *pDst points to output vector    
00055  * @param[in]       blockSize length of the input vector   
00056  * @return none.    
00057  *    
00058  */
00059 
00060 void arm_copy_q15(
00061   q15_t * pSrc,
00062   q15_t * pDst,
00063   uint32_t blockSize)
00064 {
00065   uint32_t blkCnt;                               /* loop counter */
00066 
00067 #ifndef ARM_MATH_CM0_FAMILY
00068 
00069   /* Run the below code for Cortex-M4 and Cortex-M3 */
00070 
00071   /*loop Unrolling */
00072   blkCnt = blockSize >> 2u;
00073 
00074   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
00075    ** a second loop below computes the remaining 1 to 3 samples. */
00076   while(blkCnt > 0u)
00077   {
00078     /* C = A */
00079     /* Read two inputs */
00080     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
00081     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
00082 
00083     /* Decrement the loop counter */
00084     blkCnt--;
00085   }
00086 
00087   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.    
00088    ** No loop unrolling is used. */
00089   blkCnt = blockSize % 0x4u;
00090 
00091 
00092 #else
00093 
00094   /* Run the below code for Cortex-M0 */
00095 
00096   /* Loop over blockSize number of values */
00097   blkCnt = blockSize;
00098 
00099 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
00100 
00101   while(blkCnt > 0u)
00102   {
00103     /* C = A */
00104     /* Copy and then store the value in the destination buffer */
00105     *pDst++ = *pSrc++;
00106 
00107     /* Decrement the loop counter */
00108     blkCnt--;
00109   }
00110 }
00111 
00112 /**    
00113  * @} end of BasicCopy group    
00114  */