Cheat Engine

phckr · How do I cheat? Reputation: 0 Joined: 21 Jan 2020 Posts: 2

Using "find out what writes to this address", I find the same instruction writes to two separate addresses, the X coordinate and the Y coordinate. Using "find out which addresses this instruction accesses", it shows X, but not Y. The instruction enables movement on the X and Y axis, and executes constantly. To further test this I made a code injection comparing the contents of r14, the instruction's register, to the address of Y. Again, they never match.

My aim is to disable movement on the Y axis only.

ParkourPenguin · Posted: Tue Jan 04, 2022 3:00 pm Post subject:

movups means "move unaligned packed singles". Basically, it moves all 4 floats in xmm0 into the specified address at the same time.

You can effectively disable movement on the y-coordinate at that injection point by copying the relevant value in memory into the register before writing the register to memory.
I'm assuming the y-coordinate is the second element in the vector register.

If you have SSE4.1, this is easy with insertps:

phckr · How do I cheat? Reputation: 0 Joined: 21 Jan 2020 Posts: 2

xmm0 contained two doubles, so insertps didn't work properly.
Why then is movups being used with two doubles?
this got it to work:

ParkourPenguin · Posted: Tue Jan 04, 2022 9:32 pm Post subject:

The only logical reason I can think of is that movups was introduced in SSE while movupd was introduced in SSE2. Maybe the compiler was targeting SSE only.
Might also just be a weird compiler oddity.

I'm glad you got it to work.