Compare a and b

comparator.asm

    BITS 64
                       
    section .data
        a dd -3
        b dd -3
        msg1 db 'A is bigger', 0xa
        msg1l equ $-msg1
        msg2 db 'B is bigger', 0xa
        msg2l equ $-msg2
        msg3 db 'A == B', 0xa
        msg3l equ $-msg3
        
        
    section .text
        global _start
        
    _start:          
            mov eax, [a]
            mov ebx, [b]
            
            cmp eax, ebx
            jg bigger
            cmp eax, ebx
            jl less
        
            mov eax, 4            ; equal
            mov ebx, 1
            mov ecx, msg3
            mov edx, msg3l
            int 0x80
            jmp endif
            
    bigger:
            mov eax, 4
            mov ebx, 1
            mov ecx, msg1
            mov edx, msg1l
            int 0x80
            jmp endif
    less:
            mov eax, 4
            mov ebx, 1
            mov ecx, msg2
            mov edx, msg2l 
            int 0x80
            jmp endif
    endif:        
            mov eax, 1
            int 0x80