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Subject: Re: FPU precision & signal handlers (bug?)
To: paubert@iram.es (Gabriel Paubert)
Date: Wed, 6 Mar 2002 00:06:39 +0000 (GMT)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.4.33.0203051919280.7951-100000@gra-lx1.iram.es> from "Gabriel Paubert" at Mar 05, 2002 07:23:51 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> > Think about MMX and hopefully it makes sense then.
> 
> AFAIR MMX only mucks with tag and status words (and the exponent fields of
> the stack elements), but never depends on or modifies the control word.

Right but you don't want to end up in MMX mode by suprise in a
signal handler in library code. By the same argument you don't want to end
up in a weird maths more.

I don't think its a bug. I think its correct (but seriously underdocumented)
behaviour
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