Re: Compression...
Re: Compression...
- Subject: Re: Compression...
- From: Glen Low <email@hidden>
- Date: Sat, 6 Mar 2004 15:02:09 +0800
All:
On 06/03/2004, at 2:00 PM, email@hidden wrote:
There was an OS X update which brought in compression which
used Altivec - I think it was one of the later 10.2.x updates. I
remember
afterwards that creating compressed .dmg images using Disk Copy
suddenly was much faster than before, but tools like bzip etc were
unchanged.
That's interesting. I had a look at the gzip sources some time ago and
there's apparently a section (IIRC "longest match") that would work
well in a SIMD architecture. The gzip sources already have an
optimization for Pentium MMX, but it'd be interesting if Apple or
someone else wrote (or had written) an optimization for Altivec. Note
that gzip is available as independent open source as well as part of
Darwin, so anyone contributing would benefit the entire community and a
good place Altivec would make a difference besides the usual
numerical/engineering/graphics application.
Cheers, Glen Low
---
pixelglow software | simply brilliant stuff
www.pixelglow.com
cc'ed the Altivec mailing list in case any of them know better about
this than me. (Quite likely!)
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