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Subject: Re: [Q] Looking for an emulation for CMOV* instructions.
To: rth@twiddle.net (Richard Henderson)
Date: Fri, 11 Jan 2002 23:07:21 +0000 (GMT)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox),
        Ronald.Wahl@informatik.tu-chemnitz.de (Ronald Wahl),
        linux-kernel@vger.kernel.org
In-Reply-To: <20020111141850.A9873@twiddle.net> from "Richard Henderson" at Jan 11, 2002 02:18:50 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> > It means the compiler for -m686 shouldn't have assumed cmov was available
> 
> Eh?  -march=i686 *asserts* that cmov is available.

So why is it called "i686" when the intel i686 machine definition says
its optional ? Its just the naming that seems odd

> What's the point of optimizing an IF to a cmov if I have
> to insert another IF to see if I can use cmov?

I've always wondered. Intel made the instruction optional yet there isnt
an obvious way to do runtime fixups on it
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