Cheat Engine

alanze

Why ce6.4 doesn't display some MMX ensemble code correctly?
For example PFADD, PFMUL, all which start with "0F0F".

This is what I see in ce:

This should be displayed:

Dark Byte · Posted: Sun Mar 08, 2015 2:08 pm Post subject:

these bytes seem to be invalid according to my intel assembly documentation...

http://en.wikipedia.org/wiki/3DNow!

alanze · Posted: Sun Mar 08, 2015 5:38 pm Post subject:

The processor is old (2006 ?), a single-core 2.2ghz (amd athlon 64 3200+).
The game is not old, first released in 2013 as demo, then updated to full in 2014 and 2015.
The code is in d3dx9_43.dll, the game calls a function from it named 'D3DXVec3CatmullRom'
to help calculate the camera position in world (some vectors).

Dark Byte · Posted: Sun Mar 08, 2015 6:23 pm Post subject:

ah ok, it's the dx helper library from microsoft(the game may be new, but dx9 is old) that falls back to 3dnow because of your cpu

but yeah, ce doesn't currently implement it and not sure if i should. Games don't really implement game mechanics using 3dnow, but on the other hand it might be a useful injection point, but then again the entry of the function would be more meaningful (parameters)

alanze · Posted: Sun Mar 08, 2015 7:01 pm Post subject:

I now there is a lot of work to implement but I still recommend to do it because
people from time to time return to their old machines and play some classics like 'SanAndreas' or maybe 'nfsmw',
then at a certain point want to hack something.
So even if 3dnow is 'dying quick' people will still use it in the future, and besides all other debuggers support it,
why CE would remain behind in this category?

Rydian · Posted: Mon Mar 09, 2015 3:19 am Post subject:

It's not the game, specifically, but the age of the machine.
In general you can play older games on newer machines.

alanze · Posted: Mon Mar 09, 2015 11:41 am Post subject:

We can play (almost) any game on new machines,
but also we want to cheat on old machines, and a tool like CE is welcome.