tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/SupportFunctions/arm_copy_f32.c

   1 /* ----------------------------------------------------------------------------
   2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
   3 *
   4 * $Date:        17. January 2013
   5 * $Revision:    V1.4.1
   6 *
   7 * Project:          CMSIS DSP Library
   8 * Title:                arm_copy_f32.c
   9 *
  10 * Description:  Copies the elements of a floating-point vector.
  11 *
  12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
  13 *
  14 * Redistribution and use in source and binary forms, with or without
  15 * modification, are permitted provided that the following conditions
  16 * are met:
  17 *   - Redistributions of source code must retain the above copyright
  18 *     notice, this list of conditions and the following disclaimer.
  19 *   - Redistributions in binary form must reproduce the above copyright
  20 *     notice, this list of conditions and the following disclaimer in
  21 *     the documentation and/or other materials provided with the
  22 *     distribution.
  23 *   - Neither the name of ARM LIMITED nor the names of its contributors
  24 *     may be used to endorse or promote products derived from this
  25 *     software without specific prior written permission.
  26 *
  27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38 * POSSIBILITY OF SUCH DAMAGE.
  39 * ---------------------------------------------------------------------------- */
  40
  41 #include "arm_math.h"
  42
  43 /**
  44  * @ingroup groupSupport
  45  */
  46
  47 /**
  48  * @defgroup copy Vector Copy
  49  *
  50  * Copies sample by sample from source vector to destination vector.
  51  *
  52  * <pre>
  53  *      pDst[n] = pSrc[n];   0 <= n < blockSize.
  54  * </pre>
  55  *
  56  * There are separate functions for floating point, Q31, Q15, and Q7 data types.
  57  */
  58
  59 /**
  60  * @addtogroup copy
  61  * @{
  62  */
  63
  64 /**
  65  * @brief Copies the elements of a floating-point vector.
  66  * @param[in]       *pSrc points to input vector
  67  * @param[out]      *pDst points to output vector
  68  * @param[in]       blockSize length of the input vector
  69  * @return none.
  70  *
  71  */
  72
  73
  74 void arm_copy_f32(
  75   float32_t * pSrc,
  76   float32_t * pDst,
  77   uint32_t blockSize)
  78 {
  79   uint32_t blkCnt;                               /* loop counter */
  80
  81 #ifndef ARM_MATH_CM0_FAMILY
  82
  83   /* Run the below code for Cortex-M4 and Cortex-M3 */
  84   float32_t in1, in2, in3, in4;
  85
  86   /*loop Unrolling */
  87   blkCnt = blockSize >> 2u;
  88
  89   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  90    ** a second loop below computes the remaining 1 to 3 samples. */
  91   while(blkCnt > 0u)
  92   {
  93     /* C = A */
  94     /* Copy and then store the results in the destination buffer */
  95     in1 = *pSrc++;
  96     in2 = *pSrc++;
  97     in3 = *pSrc++;
  98     in4 = *pSrc++;
  99
 100     *pDst++ = in1;
 101     *pDst++ = in2;
 102     *pDst++ = in3;
 103     *pDst++ = in4;
 104
 105     /* Decrement the loop counter */
 106     blkCnt--;
 107   }
 108
 109   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
 110    ** No loop unrolling is used. */
 111   blkCnt = blockSize % 0x4u;
 112
 113 #else
 114
 115   /* Run the below code for Cortex-M0 */
 116
 117   /* Loop over blockSize number of values */
 118   blkCnt = blockSize;
 119
 120 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
 121
 122   while(blkCnt > 0u)
 123   {
 124     /* C = A */
 125     /* Copy and then store the results in the destination buffer */
 126     *pDst++ = *pSrc++;
 127
 128     /* Decrement the loop counter */
 129     blkCnt--;
 130   }
 131 }
 132
 133 /**
 134  * @} end of BasicCopy group
 135  */