; CFG example
bits 64

    SECTION .data
; empty

    SECTION .text
global _start
_start:
    mov     rbx, 3  ; a
    mov     rcx, 2  ; b

    cmp     rbx, rcx    ; a-b
    je      equal
    ja      greater
    jb      smaller

equal:
    mov     rax, 0
    jmp     return
greater:
    mov     rax, 1
    jmp     return
smaller:
    mov     rax, -1

return:
    ; sys_exit(42)
    mov     rdi,rax ; system call return value
    mov     rax,60  ; system call number (sys_exit)
    syscall