Comperio
7th March 2006 04:35 UTC

What is 'nop'?
In help files for 2.15, the changelog mentioned that documentation was added for NOP

When you look it up, it says nop "does nothing". So why is it even there?

Dashus
7th March 2006 05:19 UTC

It's a delay; I'm not sure what instructions in NSIS might require a delay but 'nop' in assembly is designed to waste a clock cycle (or more depending on the processor). More accurately 'nop' is short for 'no op' or 'no operation'.

onad
7th March 2006 12:16 UTC

see

http://forums.winamp.com/showthread.php?postid=1865751

search is your friend ;0)

Comm@nder21
7th March 2006 16:07 UTC

its just to make things more confusing ^^

example:

Goto +3
Nop

is exactly the same as:

Goto +2

{_trueparuex^}
7th March 2006 21:03 UTC

?LOL?
Does anyone know a practical use for this?

Edit: Hmm maybe this haves an effect to the progressbar when used in section. The progressbar goes with the lines right?

Comm@nder21
7th March 2006 21:04 UTC

not at the moment :)

think, kichik knew one.

it's used inside NSIS too, for some commands...

kichik
7th March 2006 21:58 UTC

Actually, Nop came before me, I didn't add it. But I can tell what it can used for. As trueparuex said, it can be used to control the progress bar. It's also useful for debugging. If you edit the code in memory and you want some instruction not to execute, you can replace it with Nop. It can also be used to waste time, though Sleep is probably better at that.

It's not exactly used inside NSIS. You can say it's used for Goto, but I'd say it's actually the other way around. A Nop is the same as Goto 0.

dandaman32
8th March 2006 02:29 UTC

In English:

It's a command that does nothing.

I've used it as a placeholder for 'Reboot' and such when developing installers that need to reboot the system.

-dandaman32