lib/sdk/crt/mem/i386/memset_asm.s

   1
   2 #include <asm.inc>
   3 #include <ks386.inc>
   4
   5 /*
   6  * void *memset (void *src, int val, size_t count)
   7  */
   8
   9 PUBLIC _memset
  10 .code
  11
  12 FUNC _memset
  13         FPO 0, 3, 4, 1, 1, FRAME_NONFPO
  14         push ebp
  15         mov ebp, esp
  16         push edi
  17         mov edi, [ebp + 8]
  18         movzx eax, byte ptr [ebp + 12]
  19         mov ecx, [ebp + 16]
  20         cld
  21         cmp ecx, 16
  22         jb .L1
  23         mov edx, HEX(01010101)
  24         mul edx
  25         mov edx, ecx
  26         test edi, 3
  27         je .L2
  28         mov ecx, edi
  29         and ecx, 3
  30         sub ecx, 5
  31         not ecx
  32         sub edx, ecx
  33         rep stosb
  34         mov ecx, edx
  35 .L2:
  36         shr ecx, 2
  37         rep stosd
  38         mov ecx, edx
  39         and ecx, 3
  40 .L1:
  41         test ecx, ecx
  42         je .L3
  43         rep stosb
  44 .L3:
  45         pop edi
  46         mov eax, [ebp + 8]
  47         leave
  48         ret
  49 ENDFUNC
  50
  51 END