Simple loop in NASM from C

Question

Im trying to work with nasm from C and just having a hard time with the basics of nasm. Im trying to convert a simple while loop like this

while(j < k)
{k = k + 1;
 j = j + 2;
 count = count + 1;
}

I know that it will look something like

Loopee:

????
add dword [k], 1
add dword [j], 2
add dword [count], 1

but I'm not sure how to structure the while loop where it only loops until j is no longer less than k.

Have you seen this link? [assembly to compare two numbers](http://stackoverflow.com/questions/1123396/assembly-to-compare-two-numbers) — Tamerz, Apr 27 '15 at 20:56
Write it in C first, then use your compiler to generate asm (e.g. `gcc -S ...`), then use the generated asm as a template for your own code. — Paul R, Apr 27 '15 at 21:04
In order to write assembly code, you must first understand the processor instruction set. Here's a **[link](http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-manual-325462.html)** to the documentation. It's only 3400 pages, so you should be able to finish reading it by tomorrow :) — user3386109, Apr 27 '15 at 21:17

score 2 · Answer 1 · answered Apr 27 '15 at 20:54

2

A while loop is just like an IF statement, except that at the bottom of the body you unconditionally jump back to the IF (the start of the loop).

answered Apr 27 '15 at 20:54

Scott Hunter

1 Answers1