10_3_gcc_O3.asm

                public strlen
strlen          proc near

arg_0           = dword ptr  8

                push    ebp
                mov     ebp, esp
                mov     ecx, [ebp+arg_0]
                mov     eax, ecx

loc_8048418:
                movzx   edx, byte ptr [eax]
                add     eax, 1
                test    dl, dl
                jnz     short loc_8048418
                not     ecx
                add     eax, ecx
                pop     ebp
                retn
strlen          endp