text: /*****************************************************************************
   *
   * \file
   *
   * \brief generic 16-bit negate function
   *
   * Copyright (c) 2014 Atmel Corporation. All rights reserved.
   *
   * \asf_license_start
   *
   * \page License
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * 3. The name of Atmel may not be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * 4. This software may only be redistributed and used in connection with an
   *    Atmel microcontroller product.
   *
   * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
   * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * \asf_license_stop
   *
   ******************************************************************************/
   /**
   * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
   */
  
  
  #include "dsp.h"
  #include "preprocessor.h"
  
  #if defined(FORCE_ALL_GENERICS) || \
      defined(FORCE_GENERIC_VECT16_NEG) || \
      !defined(TARGET_SPECIFIC_VECT16_NEG)
  
  #define DSP16_NEGATE(x_num, data) \
    vect1[x_num] = -vect2[x_num];
  
  /*********************************************************************************************
   * This function is the ending function of the negate. It is used to negate the last items of a vector.
   *********************************************************************************************/
  #define DSP16_NEG_KERNEL_X_FCT(x_num, data)    \
  static void TPASTE2(dsp16_vect_neg_kernel_x, x_num)(dsp16_t *vect1, dsp16_t *vect2) \
  { \
    MREPEAT(x_num, DSP16_NEGATE, ""); \
  }
  /*********************************************************************************************/
  
  DSP16_NEG_KERNEL_X_FCT(0, "")
  DSP16_NEG_KERNEL_X_FCT(1, "")
  DSP16_NEG_KERNEL_X_FCT(2, "")
  DSP16_NEG_KERNEL_X_FCT(3, "")
  
  void dsp16_vect_neg(dsp16_t *vect1, dsp16_t *vect2, int size)
  {
    typedef void (*neg_kernel_opti_t)(dsp16_t *, dsp16_t *);
    static const neg_kernel_opti_t neg_end_kernel_opti[4] = {
      dsp16_vect_neg_kernel_x0,
      dsp16_vect_neg_kernel_x1,
      dsp16_vect_neg_kernel_x2,
      dsp16_vect_neg_kernel_x3
    };
    int n;
  
    for(n=0; n<size-3; n+=4)
    {
      DSP16_NEGATE(n, "");
      DSP16_NEGATE(n+1, "");
      DSP16_NEGATE(n+2, "");
      DSP16_NEGATE(n+3, "");
    }
  
    // Jump on different functions depending on the length of the vectors to compute
    neg_end_kernel_opti[size&0x3](&vect1[n], &vect2[n]);
  }
  
  #endif
  