From: Brian Hurt <bhurt@spnz.org>
To: Erik de Castro Lopo <ocaml-erikd@mega-nerd.com>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] doing MMX through ocaml
Date: Thu, 17 Nov 2005 21:06:33 -0600 (CST) [thread overview]
Message-ID: <Pine.LNX.4.63.0511172104210.24132@localhost.localdomain> (raw)
In-Reply-To: <20051118104926.3d9ffdc0.ocaml-erikd@mega-nerd.com>
On Fri, 18 Nov 2005, Erik de Castro Lopo wrote:
> Jonathan Roewen wrote:
>
>> And since MMX deals solely with integers, the Val_long/Long_val macros
>> could be implemented by a simple extra MMX instruction or two, right?
>
> All Pentium III and later processors have the SSE instruction
> set which is like MMX, but for 32 bit floats. Pentium IV and
> latter also has SSE2 which is 64 bit floats.
>
> Personally, I find SSE and SSe2 far more interesting than MMX.
I'm pretty sure you need at least SSE for MPEG. The core function is an
8x8 2D FFT. You *might* be able to do in fixed point (and thus in MMX),
but the SSE version would be a lot easier to get right.
A run time code generator would be interesting...
Brian
next prev parent reply other threads:[~2005-11-18 3:01 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-17 21:13 Jonathan Roewen
2005-11-17 21:47 ` Oliver Bandel
2005-11-17 21:57 ` Jonathan Roewen
2005-11-17 22:16 ` Damien Bobillot
2005-11-17 22:43 ` Daniel Bünzli
2005-11-17 22:55 ` Jonathan Roewen
2005-11-18 1:26 ` Vincenzo Ciancia
2005-11-18 10:04 ` [Caml-list] " Alessandro Baretta
2005-11-17 22:55 ` Damien Bobillot
2005-11-17 23:01 ` Vincenzo Ciancia
2005-11-17 23:49 ` [Caml-list] " Erik de Castro Lopo
2005-11-18 1:52 ` Grégory Guyomarc'h
2005-11-18 3:06 ` Brian Hurt [this message]
2005-11-18 3:29 ` Jonathan Roewen
2005-11-18 19:22 ` Ken Rose
2005-11-21 9:11 ` Sebastian Egner
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