asm gcc opti

        .file   "cc3.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   eax, 0
        mov   ebx, 0
        mov   al, (_x)
        mov   bl, (_y)
        add   ax, bx
        shr   ax, 1
        mov   (_r_1), ax

        mov   eax, 0
        mov   ebx, 0
        mov   al, [_x]
        mov   bl, [_y]
        mul   bx
        mov   bx, 30
        idiv  bx
        mov   bx, (_r_1)
        add   ax, bx

        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