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CZ3R0C · Posted: Fri Apr 20, 2007 9:40 am Post subject: [Help]Understanding fld st()

Lately I've been seeing alot of vac in GMS deleloping from manipulation of the opcode fld st(0). However it has come to my attention that hardley anyone that make these vacs know what exactly they are doing or changing. I don't exactly know what fld st(0) of even fld st(3) means so I was wondering if someone could shed some light on this op code.

Coramda · Posted: Fri Apr 20, 2007 10:53 am Post subject:

Actually everything that FLD does is Grab a float value, and pushes it on top of the FPU.

ST Meaning it'll load the argument into ST.

CZ3R0C · Posted: Fri Apr 20, 2007 10:55 am Post subject:

2nd question what is FPU? ST is a register right? Argument???not value?

appalsap · Posted: Fri Apr 20, 2007 10:56 am Post subject:

floating point unit, used to operate floating point numbers:

further reading

SXGuy · Posted: Fri Apr 20, 2007 12:13 pm Post subject:

appal, or someone should write a decent opcode tut, i dont mean, xor cmp's and stuff like that, i mean actuall explanations of things like this, ret, movsx, you know, the kinda opcodes we dont see as much.