Question

I am trying to find online the usage of the assembly language function “je”. I read that je means jump if equal and that is exactly what I want. What is the actual usage of this function, or in other words, how to I type this function to check a value and jump if it is equal to something?

Please let me know.

BTW, I am using NASM if that makes a difference.

Answer 1

Let’s say you want to check if EAX is equal to 5, and perform different actions based on the result of that comparison. An if-statement, in other words.

  ; ... some code ...

  cmp eax, 5
  je .if_true
  ; Code to run if comparison is false goes here.
  jmp short .end_if
.if_true:
  ; Code to run if comparison is true goes here.
.end_if:

  ; ... some code ...