Print Page - Strange FPU Command? Undocumented?

Title: Strange FPU Command? Undocumented?
Post by: johnsa on July 02, 2008, 06:29:55 PM

So I was looking at some disassembly from some C# code... and found this line...

0000007b DF F1 fcomip st,st(1)

So... I know of ficomp .. and i can't see any fcom instruction in the intel reference with the bytes DF F1.. am I missing something? :)

Title: Re: Strange FPU Command? Undocumented?
Post by: johnsa on July 02, 2008, 06:33:56 PM

Ignore me... I'm on flu medication and this post is complete junk... :)

Title: Re: Strange FPU Command? Undocumented?
Post by: vanjast on July 24, 2008, 09:39:38 PM

OK :bg

Title: Re: Strange FPU Command? Undocumented?
Post by: sinsi on August 01, 2008, 01:51:40 PM

hey vanjast, nice website. Ice cream vans, lol
I reckon the better picture is http://www.vanjast.com/Duxford/P51FerociousFreddie.JPG though...

Title: Re: Strange FPU Command? Undocumented?
Post by: herge on August 31, 2008, 05:32:31 PM

hi sinsi:

Is Duxford in England and south of Cambridge just off the M11
and home of Imperial War Museum.
They have a static Concorde aircraft on display.

Regards herge

Title: Re: Strange FPU Command? Undocumented?
Post by: PBrennick on September 01, 2008, 01:59:50 PM

Johnsa,

Don't be embarrassed. I have done worse and had to beg Hutch to remove the thread (a year or so ago as I recall). I wanted to crawl under a rock.

Use the attached Opcode Listview, it helps. The Pentium II version is ordered both ways in separate listviews making it easy to pinpoint an opcode.

-- Paul

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General Forums => The Laboratory => Topic started by: johnsa on July 02, 2008, 06:29:55 PM