arm_copy_f32.c

00001 /* ----------------------------------------------------------------------------    
00002 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.    
00003 *    
00004 * $Date:        17. January 2013 
00005 * $Revision:    V1.4.1  
00006 *    
00007 * Project:      CMSIS DSP Library    
00008 * Title:        arm_copy_f32.c    
00009 *    
00010 * Description:  Copies the elements of a floating-point 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  * @defgroup copy Vector Copy    
00049  *    
00050  * Copies sample by sample from source vector to destination vector.    
00051  *    
00052  * <pre>    
00053  *  pDst[n] = pSrc[n];   0 <= n < blockSize.    
00054  * </pre>    
00055  *   
00056  * There are separate functions for floating point, Q31, Q15, and Q7 data types.     
00057  */
00058 
00059 /**    
00060  * @addtogroup copy    
00061  * @{    
00062  */
00063 
00064 /**    
00065  * @brief Copies the elements of a floating-point vector.     
00066  * @param[in]       *pSrc points to input vector    
00067  * @param[out]      *pDst points to output vector    
00068  * @param[in]       blockSize length of the input vector   
00069  * @return none.    
00070  *    
00071  */
00072 
00073 
00074 void arm_copy_f32(
00075   float32_t * pSrc,
00076   float32_t * pDst,
00077   uint32_t blockSize)
00078 {
00079   uint32_t blkCnt;                               /* loop counter */
00080 
00081 #ifndef ARM_MATH_CM0_FAMILY
00082 
00083   /* Run the below code for Cortex-M4 and Cortex-M3 */
00084   float32_t in1, in2, in3, in4;
00085 
00086   /*loop Unrolling */
00087   blkCnt = blockSize >> 2u;
00088 
00089   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
00090    ** a second loop below computes the remaining 1 to 3 samples. */
00091   while(blkCnt > 0u)
00092   {
00093     /* C = A */
00094     /* Copy and then store the results in the destination buffer */
00095     in1 = *pSrc++;
00096     in2 = *pSrc++;
00097     in3 = *pSrc++;
00098     in4 = *pSrc++;
00099 
00100     *pDst++ = in1;
00101     *pDst++ = in2;
00102     *pDst++ = in3;
00103     *pDst++ = in4;
00104 
00105     /* Decrement the loop counter */
00106     blkCnt--;
00107   }
00108 
00109   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.    
00110    ** No loop unrolling is used. */
00111   blkCnt = blockSize % 0x4u;
00112 
00113 #else
00114 
00115   /* Run the below code for Cortex-M0 */
00116 
00117   /* Loop over blockSize number of values */
00118   blkCnt = blockSize;
00119 
00120 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
00121 
00122   while(blkCnt > 0u)
00123   {
00124     /* C = A */
00125     /* Copy and then store the results in the destination buffer */
00126     *pDst++ = *pSrc++;
00127 
00128     /* Decrement the loop counter */
00129     blkCnt--;
00130   }
00131 }
00132 
00133 /**    
00134  * @} end of BasicCopy group    
00135  */