reactos/lib/string/i386/memcpy.s

   1 /*
   2  * $Id$
   3  */
   4
   5 /*
   6  * void *memcpy (void *to, const void *from, size_t count)
   7  */
   8
   9 .globl  _memcpy
  10
  11 _memcpy:
  12         push    %ebp
  13         mov     %esp,%ebp
  14         push    %esi
  15         push    %edi
  16         mov     0x8(%ebp),%edi
  17         mov     0xc(%ebp),%esi
  18         mov     0x10(%ebp),%ecx
  19         cld
  20         cmp     $16,%ecx
  21         jb      .L1
  22         mov     %ecx,%edx
  23         test    $3,%edi
  24         je      .L2
  25 /*
  26  *  Make the destination dword aligned
  27  */
  28         mov     %edi,%ecx
  29         and     $3,%ecx
  30         sub     $5,%ecx
  31         not     %ecx
  32         sub     %ecx,%edx
  33         rep     movsb
  34         mov     %edx,%ecx
  35 .L2:
  36         shr     $2,%ecx
  37         rep     movsl
  38         mov     %edx,%ecx
  39         and     $3,%ecx
  40 .L1:
  41         test    %ecx,%ecx
  42         je      .L3
  43         rep     movsb
  44 .L3:
  45         pop     %edi
  46         pop     %esi
  47         mov     0x8(%ebp),%eax
  48         leave
  49         ret
  50