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From:	Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Cross Platform Incompatabilites? - code fragments
Date:	18 Feb 2004 14:55:24 GMT
Organization:	Aachen University of Technology (RWTH)
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Eli Zaretskii <eliz AT elta DOT co DOT il> wrote:
> > From: Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
> > Newsgroups: comp.os.msdos.djgpp
> > Date: 18 Feb 2004 10:48:11 GMT
> > 
> > My memory may be failing me here, but I do seem to recall exactly that
> > having been the case, at least once in the past.  Windows 9x seemed to
> > re-set the FPU control word of a running DJGPP program in mid-stream,
> > or at least allow that to happen, if some other process tramps over
> > it.  I.e. it fails to guarantee keeping an FPU control word change
> > alive over the duration of a DOS process.

> I thought about something like that, but this could only have effect
> on programs that trigger exceptions, no?

It's explicitly been reported to affect the FPU precision control,
too.  

In the meantime, I've found at least one possible reference to
this to back up what I remembered only so vaguely:

	http://www.wrotniak.net/works/testfpu/

Mr. Wrotniak explicitly mentions McAfee's vshield.exe as one culprit
causing such effects.

-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.

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