reactos/ntoskrnl/rtl/i386/memcpy.c

   1 /* $Id: memcpy.c,v 1.2 2002/09/07 15:13:06 chorns Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/rtl/i386/memcpy.c
   6  * PROGRAMMER:      Hartmut Birr
   7  * UPDATE HISTORY:
   8  */
   9
  10 /* INCLUDES *****************************************************************/
  11
  12 #include <ntoskrnl.h>
  13 #include <string.h>
  14
  15 #define NDEBUG
  16 #include <internal/debug.h>
  17
  18 /* FUNCTIONS *****************************************************************/
  19
  20 #undef memcpy
  21 void *memcpy (void *to, const void *from, size_t count)
  22 {
  23   __asm__( \
  24         "or     %%ecx,%%ecx\n\t"\
  25         "jz     .L1\n\t"        \
  26         "cld\n\t"               \
  27         "rep\n\t"               \
  28         "movsb\n\t"             \
  29         ".L1:\n\t"
  30           :
  31           : "D" (to), "S" (from), "c" (count));
  32   return to;
  33 }
  34