lib/main/CMSIS/DSP/Source/SupportFunctions/arm_copy_f32.c

   1 /* ----------------------------------------------------------------------
   2  * Project:      CMSIS DSP Library
   3  * Title:        arm_copy_f32.c
   4  * Description:  Copies the elements of a floating-point 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  * @defgroup copy Vector Copy
  37  *
  38  * Copies sample by sample from source vector to destination vector.
  39  *
  40  * <pre>
  41  *      pDst[n] = pSrc[n];   0 <= n < blockSize.
  42  * </pre>
  43  *
  44  * There are separate functions for floating point, Q31, Q15, and Q7 data types.
  45  */
  46
  47 /**
  48  * @addtogroup copy
  49  * @{
  50  */
  51
  52 /**
  53  * @brief Copies the elements of a floating-point vector.
  54  * @param[in]       *pSrc points to input vector
  55  * @param[out]      *pDst points to output vector
  56  * @param[in]       blockSize length of the input vector
  57  * @return none.
  58  *
  59  */
  60
  61
  62 void arm_copy_f32(
  63   float32_t * pSrc,
  64   float32_t * pDst,
  65   uint32_t blockSize)
  66 {
  67   uint32_t blkCnt;                               /* loop counter */
  68
  69 #if defined (ARM_MATH_DSP)
  70
  71   /* Run the below code for Cortex-M4 and Cortex-M3 */
  72   float32_t in1, in2, in3, in4;
  73
  74   /*loop Unrolling */
  75   blkCnt = blockSize >> 2U;
  76
  77   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  78    ** a second loop below computes the remaining 1 to 3 samples. */
  79   while (blkCnt > 0U)
  80   {
  81     /* C = A */
  82     /* Copy and then store the results in the destination buffer */
  83     in1 = *pSrc++;
  84     in2 = *pSrc++;
  85     in3 = *pSrc++;
  86     in4 = *pSrc++;
  87
  88     *pDst++ = in1;
  89     *pDst++ = in2;
  90     *pDst++ = in3;
  91     *pDst++ = in4;
  92
  93     /* Decrement the loop counter */
  94     blkCnt--;
  95   }
  96
  97   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  98    ** No loop unrolling is used. */
  99   blkCnt = blockSize % 0x4U;
 100
 101 #else
 102
 103   /* Run the below code for Cortex-M0 */
 104
 105   /* Loop over blockSize number of values */
 106   blkCnt = blockSize;
 107
 108 #endif /* #if defined (ARM_MATH_DSP) */
 109
 110   while (blkCnt > 0U)
 111   {
 112     /* C = A */
 113     /* Copy and then store the results in the destination buffer */
 114     *pDst++ = *pSrc++;
 115
 116     /* Decrement the loop counter */
 117     blkCnt--;
 118   }
 119 }
 120
 121 /**
 122  * @} end of BasicCopy group
 123  */