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Floating point value (FPU)

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Fresco
Grandmaster Cheater

Reputation: 4

Joined: 07 Nov 2010
Posts: 600

Posted: Sun Mar 11, 2012 11:49 am Post subject: Floating point value (FPU)

I need to store a double value in to an address.

I've been suggested to:

Code:

mov [eax],first part //Write Double
mov [eax+4],second part //Write Double

It works but it's not what I'm looking for, so I've changed it in to this:

Code:

fld [double_value] //Push in TOS (FPU) value of double_value
fstp [eax] //Pop from TOS (FPU) value of double_value and store value of double_value into eax
//the result will be [eax] = first part of double_value
//[eax+4] = second part of double_value

This also works, but it doesn't store just everything, I'll make an example:
value to write (IN FPU)
4040000040400000
value stored
4040000040400000
------------------------
value to write (IN FPU)
4040ABCD4040EF12
value stored
404000004040EF12
------------------------
How can i fix that ?
What am I doing wrong ?
_________________

... Fresco

Kavvman
Master Cheater

Reputation: 2

Joined: 17 Apr 2004
Posts: 316

Posted: Sun Mar 11, 2012 12:49 pm Post subject:

fstp qword ptr [dest] _________________ ...

Fresco
Grandmaster Cheater

Reputation: 4

Joined: 07 Nov 2010
Posts: 600

Posted: Mon Mar 12, 2012 7:33 am Post subject:

thanks ... it workd
even though

Code:

fld qword ptr [label] // in order to make it work i had to put "qword ptr" prefix here too
fstp qword ptr [destination pointer]

just in case others bump into this post:
byte ptr = 1 byte
word ptr = 2 bytes
dword ptr = 4 bytes
qword ptr = 8 bytes

float = 4 bytes
double = 8 bytes
_________________

... Fresco

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