memcpy.c

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/*
 *                               POK header
 * 
 * The following file is a part of the POK project. Any modification should
 * made according to the POK licence. You CANNOT use this file or a part of
 * this file is this part of a file for your own project
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2009 POK team 
 *
 * Created by julien on Thu Jan 15 23:34:13 2009 
 */


#include <libc.h>

void* memcpy (void*        to,
              const void*  from,
              size_t       n)
{
#ifdef __i386__
  int d0;
  int d1;
  int d2;

  __asm__ __volatile__(
                       "rep ; movsl\n\t"
                       "testb $2,%b4\n\t"
                       "je 1f\n\t"
                       "movsw\n"
                       "1:\ttestb $1,%b4\n\t"
                       "je 2f\n\t"
                       "movsb\n"
                       "2:"
                       : "=&c" (d0), "=&D" (d1), "=&S" (d2)
                       :"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from)
                       : "memory");
#else
  char *cto = (char *)to;
  const char *cfrom = (const char *)from;

  for (; n > 0; n--)
  {
       *cto++ = *cfrom++;
  }
#endif
  return (to);
}