FPU: Load constant floating point value

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flona

Joined: 05 Nov 2008
Posts: 7
Location: Germany

flona 14 Jan 2009, 21:16

Hello,
I was wondering if there's a way to load a constant FP to st0. The following code doesn't work:

Code:

fld 123.456

thanks

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My english is not very well. Pardon.

14 Jan 2009, 21:16

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20759
Location: In your JS exploiting you and your system

revolution 14 Jan 2009, 21:41

Code:

value dd 123.456 ;or DQ/DT if you want more precision.
...
fld [value]

14 Jan 2009, 21:41

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7103
Location: Slovakia

vid 14 Jan 2009, 22:56

if you REALLY want to have it in one place, and 32bit precision is enough, easiest you can do is probably something like

Code:

push dword 123.456   ;FASM supports this
fld [esp]    ;FLD from stack
add esp, 4   ;remove value from stack

but i would suggest revolution's version.

14 Jan 2009, 22:56

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20759
Location: In your JS exploiting you and your system

revolution 14 Jan 2009, 23:02

One thing to note with vid's suggestion is that you need a type override.

Code:

push dword 123.456
fld dword [esp]    ;add the operand size override
add esp, 4

14 Jan 2009, 23:02

flona

Joined: 05 Nov 2008
Posts: 7
Location: Germany

flona 15 Jan 2009, 13:01

thank you

_________________
My english is not very well. Pardon.

15 Jan 2009, 13:01

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