asm GAS no opti

        .file   "cc2.c"
        .intel_syntax noprefix
        .globl  _x
        .data
_x:
        .byte   45
        .globl  _y
_y:
        .byte   50
        .comm   _r_1, 2, 1
        .comm   _r_2, 2, 1
        .comm   _n, 4, 2
        .def    ___main;        .scl    2;      .type   32;     .endef
        .section .rdata,"dr"
LC0:
        .ascii "(x + y)/2 + (y * x)/30 = %d\12\0"
LC1:
        .ascii "%d\0"
        .text
        .globl  _main
        .def    _main;  .scl    2;      .type   32;     .endef
_main:
LFB6:
        .cfi_startproc
        push    ebp
        .cfi_def_cfa_offset 8
        .cfi_offset 5, -8
        mov     ebp, esp
        .cfi_def_cfa_register 5
        push    ebx
        and     esp, -16
        sub     esp, 16
        .cfi_offset 3, -12
        call    ___main
        mov     al, BYTE PTR _x
        movsx   dx, al
        mov     al, BYTE PTR _y
        cbw
        add     eax, edx
        mov     WORD PTR _r_1, ax
        mov     ax, WORD PTR _r_1
        mov     edx, eax
        shr     dx, 15
        add     eax, edx
        sar     ax
        mov     WORD PTR _r_1, ax
        mov     al, BYTE PTR _x
        movsx   dx, al
        mov     al, BYTE PTR _y
        cbw
        imul    ax, dx
        mov     WORD PTR _r_2, ax
        mov     dx, WORD PTR _r_2
        movsx   ecx, dx
        mov     eax, ecx
        sal     eax, 4
        add     eax, ecx
        mov     ebx, eax
        sal     ebx, 8
        add     eax, ebx
        sal     eax, 3
        add     eax, ecx
        shr     eax, 16
        sub     ax, dx
        add     eax, edx
        mov     ecx, eax
        sar     cx, 4
        mov     eax, edx
        sar     ax, 15
        mov     edx, ecx
        sub     dx, ax
        mov     eax, edx
        mov     WORD PTR _r_2, ax
        mov     ax, WORD PTR _r_1
        movsx   edx, ax
        mov     ax, WORD PTR _r_2
        cwde
        add     eax, edx
        mov     DWORD PTR [esp+4], eax
        mov     DWORD PTR [esp], OFFSET FLAT:LC0
        call    _printf
        mov     DWORD PTR [esp+4], OFFSET FLAT:_n
        mov     DWORD PTR [esp], OFFSET FLAT:LC1
        call    _scanf
        mov     ebx, DWORD PTR [ebp-4]
        leave
        .cfi_restore 5
        .cfi_def_cfa 4, 4
        .cfi_restore 3
        ret
        .cfi_endproc
LFE6:
        .def    _printf;        .scl    2;      .type   32;     .endef
        .def    _scanf; .scl    2;      .type   32;     .endef