src/string/i386/memset.s

   1 .global memset
   2 .type memset,@function
   3 memset:
   4         mov 12(%esp),%ecx
   5         cmp $62,%ecx
   6         ja 2f
   7
   8         mov 8(%esp),%dl
   9         mov 4(%esp),%eax
  10         test %ecx,%ecx
  11         jz 1f
  12
  13         mov %dl,%dh
  14
  15         mov %dl,(%eax)
  16         mov %dl,-1(%eax,%ecx)
  17         cmp $2,%ecx
  18         jbe 1f
  19
  20         mov %dx,1(%eax)
  21         mov %dx,(-1-2)(%eax,%ecx)
  22         cmp $6,%ecx
  23         jbe 1f
  24
  25         shl $16,%edx
  26         mov 8(%esp),%dl
  27         mov 8(%esp),%dh
  28
  29         mov %edx,(1+2)(%eax)
  30         mov %edx,(-1-2-4)(%eax,%ecx)
  31         cmp $14,%ecx
  32         jbe 1f
  33
  34         mov %edx,(1+2+4)(%eax)
  35         mov %edx,(1+2+4+4)(%eax)
  36         mov %edx,(-1-2-4-8)(%eax,%ecx)
  37         mov %edx,(-1-2-4-4)(%eax,%ecx)
  38         cmp $30,%ecx
  39         jbe 1f
  40
  41         mov %edx,(1+2+4+8)(%eax)
  42         mov %edx,(1+2+4+8+4)(%eax)
  43         mov %edx,(1+2+4+8+8)(%eax)
  44         mov %edx,(1+2+4+8+12)(%eax)
  45         mov %edx,(-1-2-4-8-16)(%eax,%ecx)
  46         mov %edx,(-1-2-4-8-12)(%eax,%ecx)
  47         mov %edx,(-1-2-4-8-8)(%eax,%ecx)
  48         mov %edx,(-1-2-4-8-4)(%eax,%ecx)
  49
  50 1:      ret
  51
  52 2:      movzbl 8(%esp),%eax
  53         mov %edi,12(%esp)
  54         imul $0x1010101,%eax
  55         mov 4(%esp),%edi
  56         test $15,%edi
  57         mov %eax,-4(%edi,%ecx)
  58         jnz 2f
  59
  60 1:      shr $2, %ecx
  61         rep
  62         stosl
  63         mov 4(%esp),%eax
  64         mov 12(%esp),%edi
  65         ret
  66
  67 2:      xor %edx,%edx
  68         sub %edi,%edx
  69         and $15,%edx
  70         mov %eax,(%edi)
  71         mov %eax,4(%edi)
  72         mov %eax,8(%edi)
  73         mov %eax,12(%edi)
  74         sub %edx,%ecx
  75         add %edx,%edi
  76         jmp 1b