c - Printing bigger number in NASM -

i'm starting learning assembly , i've encountered little problem. i'm trying code program takes 2 integers , prints bigger one. want using printf , scanf c. unfortunately wrote returns second value , keep wondering why. here's code:

extern printf extern scanf global main  section .text main: push rbp                     ;input of first number     mov rdi, fmt     mov rsi, number1     xor rax, rax     call scanf                      ;input of second number     mov rdi, fmt     mov rsi, number2     xor rax, rax     call scanf                      ;comparing numbers     mov rdx, qword [number1]     cmp rdx, qword [number2]     jl _1issmaller     jge _2issmaller  _1issmaller:            ;1st number smaller     mov rdi, fmt_out     mov rsi, qword [number1]     xor rax, rax     call printf     jmp _exit   _2issmaller:            ;2nd number smaller     mov rdi, fmt_out     mov rsi, qword [number2]     xor rax, rax     call printf     jmp _exit   _exit:  pop rbp  mov rax, 0 mov rbx, 1 int 80h  section .data fmt db "%d", 0 fmt_out db "smaller number: %d", 10, 0 number1 dd 0 number2 dd 0 

is there can me? in advance

you have defined numbers (number1 , number2) dwords dd in .data-section, you're referencing them qwords cmp.

so result quite unpredictable/depending on memory layout.