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From:	Rugxulo <rugxulo AT gmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: CWSDPMI r5 test update status?
Date:	Mon, 22 Dec 2008 23:03:41 -0800 (PST)
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Hi,

On Dec 22, 6:30 pm, "Charles Sandmann" <cwsd DOT  DOT  DOT  AT earthlink DOT net> wrote:
> > Just wondering if the CWSDPMI r5 test update will be promoted to release
> > anytime soon.
>
> There have been no reported problems with the r5 update, but I have been
> too busy to deal with it recently. If you need it, grab the test release
> and start using it. Trivial updates to 8 year old software usually aren't
> urgent.

The SSE thing is only an issue for pure DOS since modern OSes
(Win98SE, Linux 2.4) do it for you. The advantage of having CWSDPMI do
it for us is that a). we don't have to manually do it ourselves in
every single app, b). we can use the standard "ring 3" CWSDSTUB
without worrying about crashing the machine, and c). virtual memory!!
(Previously I was manually turning it on myself and using D3X, which
is stub only and only ring 0 without virtual memory.)

I'm not a math guru at all, and GCC / DJGPP doesn't really generate
SSE automatically so far, so really you have to hand-code your SSE
(like Matt Mahoney did for PAQ8). It can bring noticeable speedups,
just slightly hard to understand, IMHO. (But bigger registers,
independent of FPU, etc. vs. MMX. Besides, don't new Core 2s / Phenoms
have bigger SSE bandwidth, e.g. 256 bits now?? So SSE should be faster
now. And they say MMX is deprecated, no float doubles like SSE2, only
integers. So it's considered less useful.)

I'm trying to package up a new paq8o8z update, but as always, it's
such a wimpy port, so caveat emptor. Besides, nobody but me seems to
care anyways. (What, recompressing .JPGs in FreeDOS isn't fun?)    ;-)

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