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Index > Main > FPU: Load constant floating point value

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flona



Joined: 05 Nov 2008
Posts: 7
Location: Germany
flona
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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Post 14 Jan 2009, 21:16
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17271
Location: In your JS exploiting you and your system
revolution
Code:
value dd 123.456 ;or DQ/DT if you want more precision.
...
fld [value]    
Post 14 Jan 2009, 21:41
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
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.
Post 14 Jan 2009, 22:56
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17271
Location: In your JS exploiting you and your system
revolution
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    
Post 14 Jan 2009, 23:02
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flona



Joined: 05 Nov 2008
Posts: 7
Location: Germany
flona
Very Happy thank you Exclamation

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Post 15 Jan 2009, 13:01
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