Cheat Engine

[Dr.Disrespect]

I have difficulties understanding the following opcode: fmul, fstp, etc.

I have done some research, and found something called:floating-point register stack, such as ST0, ST1, etc. Also, in CE, under "FPURegisters", there is an "Extended" tag in the drop down list, which shows something like this:
69.08
Nan
Nan
Nan
Nan
2097152.00
10000.00
3125029.00

Question 1: So, is the stack above only for floating-point registers? It's different from the "x86 stack" we usually talk about, right?

Question 2: how does the values got pushed onto such stack?

Question 3: what does " fmul dword ptr [ebp-01]" actually do? It indicates a dword pointer, and multiply to what? Where does the data come from, and after the computation, where does the result go?

Question 4: what are the relationships between FPU registers and XMM registers?

I'm just confused....

[ParkourPenguin]

Q1 & Q2: http://forum.cheatengine.org/viewtopic.php?t=604329

Q3: that instruction multiplies the value on the top of the fpu stack by the single-precision floating point value located at the address ebp-1 and stores the result at the top of the fpu stack.

Q4: They both work with IEEE 754 floating point values in different ways. Besides that general statement, you'd be better off looking at how each works independently.

[Dr.Disrespect]