arm_copy_f32.c

00001 /* ----------------------------------------------------------------------
00002  * Project:      CMSIS DSP Library
00003  * Title:        arm_copy_f32.c
00004  * Description:  Copies the elements of a floating-point 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  * @defgroup copy Vector Copy
00037  *
00038  * Copies sample by sample from source vector to destination vector.
00039  *
00040  * <pre>
00041  *  pDst[n] = pSrc[n];   0 <= n < blockSize.
00042  * </pre>
00043  *
00044  * There are separate functions for floating point, Q31, Q15, and Q7 data types.
00045  */
00046 
00047 /**
00048  * @addtogroup copy
00049  * @{
00050  */
00051 
00052 /**
00053  * @brief Copies the elements of a floating-point vector.
00054  * @param[in]       *pSrc points to input vector
00055  * @param[out]      *pDst points to output vector
00056  * @param[in]       blockSize length of the input vector
00057  * @return none.
00058  *
00059  */
00060 
00061 
00062 void arm_copy_f32(
00063   float32_t * pSrc,
00064   float32_t * pDst,
00065   uint32_t blockSize)
00066 {
00067   uint32_t blkCnt;                               /* loop counter */
00068 
00069 #if defined (ARM_MATH_DSP)
00070 
00071   /* Run the below code for Cortex-M4 and Cortex-M3 */
00072   float32_t in1, in2, in3, in4;
00073 
00074   /*loop Unrolling */
00075   blkCnt = blockSize >> 2U;
00076 
00077   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
00078    ** a second loop below computes the remaining 1 to 3 samples. */
00079   while (blkCnt > 0U)
00080   {
00081     /* C = A */
00082     /* Copy and then store the results in the destination buffer */
00083     in1 = *pSrc++;
00084     in2 = *pSrc++;
00085     in3 = *pSrc++;
00086     in4 = *pSrc++;
00087 
00088     *pDst++ = in1;
00089     *pDst++ = in2;
00090     *pDst++ = in3;
00091     *pDst++ = in4;
00092 
00093     /* Decrement the loop counter */
00094     blkCnt--;
00095   }
00096 
00097   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
00098    ** No loop unrolling is used. */
00099   blkCnt = blockSize % 0x4U;
00100 
00101 #else
00102 
00103   /* Run the below code for Cortex-M0 */
00104 
00105   /* Loop over blockSize number of values */
00106   blkCnt = blockSize;
00107 
00108 #endif /* #if defined (ARM_MATH_DSP) */
00109 
00110   while (blkCnt > 0U)
00111   {
00112     /* C = A */
00113     /* Copy and then store the results in the destination buffer */
00114     *pDst++ = *pSrc++;
00115 
00116     /* Decrement the loop counter */
00117     blkCnt--;
00118   }
00119 }
00120 
00121 /**
00122  * @} end of BasicCopy group
00123  */
00124