reactos/lib/string/i386/memset.s

   1 /*
   2  * $Id$
   3  */
   4
   5 /*
   6  * void *memset (void *src, int val, size_t count)
   7  */
   8
   9 .globl  _memset
  10
  11 _memset:
  12         push    %ebp
  13         mov     %esp,%ebp
  14         push    %edi
  15         mov     0x8(%ebp),%edi
  16         movzb   0xc(%ebp),%eax
  17         mov     0x10(%ebp),%ecx
  18         cld
  19         cmp     $16,%ecx
  20         jb      .L1
  21         mov     $0x01010101,%edx
  22         mul     %edx
  23         mov     %ecx,%edx
  24         test    $3,%edi
  25         je      .L2
  26         mov     %edi,%ecx
  27         and     $3,%ecx
  28         sub     $5,%ecx
  29         not     %ecx
  30         sub     %ecx,%edx
  31         rep     stosb
  32         mov     %edx,%ecx
  33 .L2:
  34         shr     $2,%ecx
  35         rep     stosl
  36         mov     %edx,%ecx
  37         and     $3,%ecx
  38 .L1:
  39         test    %ecx,%ecx
  40         je      .L3
  41         rep     stosb
  42 .L3:
  43         pop     %edi
  44         mov     0x8(%ebp),%eax
  45         leave
  46         ret
  47