.section        .rodata
scn_fmt:
        .string "%d%d%d%d"
pnt_fmt:
        .string "%d\n"

        .data
sum:    .int    0

        .text
        .global process
process:
        pushl   %ebp
        movl    %esp, %ebp

loop_start_:
        leal    -4(%esp), %eax
        pushl   %eax
        leal    -4(%esp), %eax
        pushl   %eax
        leal    -4(%esp), %eax
        pushl   %eax
        leal    -4(%esp), %eax
        pushl   %eax
        pushl   $scn_fmt
        call    scanf
        addl    $20, %esp
        cmpl    $4, %eax
        jnz     finish_

        movl    $0, %eax
        addl    -12(%esp), %eax /* b1 */
        subl    -16(%esp), %eax /* a1 */

        addl    -4(%esp), %eax /* b2 */
        subl    -8(%esp), %eax /* a2 */

        /* addl    %eax, sum */

        movl    -12(%esp), %ecx
        cmpl    -4(%esp), %ecx /* b1 - b2 */
        jl      take_b2_
cnt1_:
        subl    %ecx, %eax

        movl    -16(%esp), %ecx
        cmpl    -8(%esp), %ecx /* a1 - a2 */
        jg      take_a2_
cnt2_:

        addl    %ecx, %eax

        cmpl    $0, %eax
        jg      add_sum_
        jmp     loop_start_

finish_:
        pushl   sum
        pushl   $pnt_fmt
        call    printf
        addl    $8, %esp

        popl    %ebp
        ret

take_b2_:
        movl    -4(%esp), %ecx
        jmp     cnt1_

take_a2_:
        movl    -8(%esp), %ecx
        jmp     cnt2_

add_sum_:
        addl    %eax, sum
        jmp     loop_start_