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From: Falk Hueffner (falk.hueffnerstudent.uni-tuebingen.de)
Date: Thu Jan 03 2002 - 16:26:00 CST
Jay Estabrook <Jay.Estabrookcompaq.com> writes:
> On Thu, Jan 03, 2002 at 08:25:54PM +0100, Falk Hueffner wrote:
> > I'm currently working on optimizing the ffmpeg divx engine, which
> > is for example used in mplayer, for Alpha/MVI (I think a PC164 has
> > MVI, too?).
> Sorry, PC164 doesn't support the MVI instructions, nor does LX164.
> Are you thinking of the BWX instructions (byte/word)? Then yes, any
> machine with EV56 or later CPU supports those, which includes PC164.
Hmm, too bad, as its name implies, it is quite useful for Video :)
(Though it is missing byte/wordwise addition and subtraction
badly. Does anybody have an idea how to emulate this efficiently?) But
many of the improvements don't actually require it, and I've
conditionalized it with amask, so it should still show some speedup.
The BWX extension isn't quite as important, since I try to handle
quads in parallel.
BTW, does anybody know how to communicate the scheduling class of an
asm to gcc? For example, it groups all the perrs together, which is
hardly optimal :(
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