Cheat Engine

hhhuut · Posted: Wed Jan 13, 2016 2:45 pm Post subject:

What is the value stored in "[rcx+10b4]"?

Because if it's always lower than the one stored in xmm0 (211.0), then of course it always jumps at "jg" ...

Noobrzor · Posted: Wed Jan 13, 2016 2:53 pm Post subject:

I meant it always jumps at JG whether xmm0 or rcx+10b is float 111 or float 333.

I said it, I believe - "When [rcx+000010B4] and therefore xmm0 (I had tested whether the xmm0 returns correct with a separate registersymbol and viewed in cheat engine) is EITHER above or below amountY: "

akumakuja28 · Posted: Wed Jan 13, 2016 3:32 pm Post subject:

Comiss is a brain breaker sometimes.

But use jb and ja instead of jl, jg

Jump below, jb

Jump above, ja

++METHOS · Posted: Wed Jan 13, 2016 3:35 pm Post subject:

Use ja/jb.

Noobrzor · Posted: Wed Jan 13, 2016 3:55 pm Post subject:

Unbelieveable coincidence. I had just tried doing exactly that, and it worked perfectly - whether I used down to negative float values or not.
I had been searching on float comparisons, and I found someone referring to comiss'es as to be used with jg and jl, not ja and jb.
Any way, both above responses had been problem-solving.

So, it seems for signed normal integers you need jg and jl, but for floats ja and jb are all right? How come this difference?

ParkourPenguin · Posted: Wed Jan 13, 2016 3:58 pm Post subject:

From this reference:

Noobrzor · Posted: Wed Jan 13, 2016 4:02 pm Post subject:

I see, thanks a lot for clearing it up.

To sum it up, cmp is different from comiss, and floats are different than normal integers in a way that JA and JB from comiss understands negative values inherently from floats with comiss, but in CMP it still is required to use JG and JL for negative values, yes?

ParkourPenguin · Posted: Wed Jan 13, 2016 4:25 pm Post subject:

I wouldn't word it exactly that way. More so:
comiss is an instruction used for a signed comparison of single-precision floating point numbers. It sets the ZF, PF, and CF flags.
cmp is an instruction used to compare two bytes/words/dwords. It is used for signed and unsigned comparisons of integers and sets a bunch of flags.
AFAIK it's just a coincidence that comiss sets the same flags that are checked after a cmp of unsigned integers.

Noobrzor · Posted: Wed Jan 13, 2016 4:45 pm Post subject:

Oh, I see. Thanks a lot for your help and time.