| NaN Magic Bingo! [message #56807] |
Thu, 15 November 2007 12:28  |
Mort Canty
Messages: 134
Registered: March 2003
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Senior Member |
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Peter Mason schrieb:
> I'll add four cents to the kitty.
>
> .....
> I have noticed a rare floating-point bug with CISCO VPN Client
version > 4.x.
> With this client running and connected, I get the occasional
>floating-point
> corruption in my program. (A regular app, not some kind of network
> thing.)
> I'm pretty sure it's caused by VPN client although I don't know
>exactly how.
> My program is all in C - no IDL - but I would expect the same thing
>applies
> to any code that gets stuck into a serious amount of FP calculations.
>The problem seems fixed in CISCO VPN client version 5.
>
> Peter
>
>
It was the CISCO VPN client! Thank you Peter. That was the best four
cents I ever got! If you're ever anywhere near the town of Juelich,
Germany, let me know. I owe you a big, cold, German beer.
Mort
PS. CISCO -> The Cisco Kid (50's radio) -> Mexico -> Coyote ... David
was right, as usual.
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| Re: NaN Magic Bingo! [message #56845 is a reply to message #56807] |
Mon, 19 November 2007 13:07  |
Peter Mason
Messages: 145
Registered: June 1996
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Senior Member |
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Reimar Bauer wrote:
<...>
> Dear Peter
>
> thanks for pointing this out. Do you have knowledge on which platforms
> this trouble occure. Does the cisco code affect all platforms.
>
> cheers
> Reimar
Hi Reimar,
We only have Windows PCs here these days so I haven't tried it out on a Mac
or such. I've seen the bug occur with two different versions of CISCO VPN
Client 4.x, on Windows XP Professional and probably 2000. I haven't tried
Vista or checked out hardware (different CPUs). I have a hunch that the
bug is Intel-specific (e.g., the MMX registers sharing the same space with
the floating-point stack is always a worry) but I don't have anything to
support this hunch. I stopped worrying about it, really, when I couldn't
repeat the bug in VPN Client version 5.
Cheers
Peter
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