English Amiga Board Amiga Lore


Go Back   English Amiga Board > Coders > Coders. General

 
 
Thread Tools
Old 05 September 2017, 00:11   #1
Trachu
Registered User
 
Join Date: Dec 2015
Location: Poland
Posts: 164
Probably fastest decompression algorythm on amiga 500

Hello

I find it on some forum, and find it interesting enough to share this with you.

Someone has created its own LZ4 derivative optimised for Motorola 68000 with decompression speed 760kB per second, which is i believe the fastest there is on Amiga.

https://groups.google.com/forum/#!to...4c/oe1IWpuk8tE

Sometimes such fst decompression routine could be handy.
Trachu is offline  
AdSense AdSense  
Old 05 September 2017, 10:17   #2
chb
Registered User

 
Join Date: Dec 2014
Location: germany
Posts: 43
The author of the LZ4-packer (Stephane Dallongeville) presented it some time ago here at EAB: http://eab.abime.net/showpost.php?p=...8&postcount=17 . Unfortunately, his account is not active here anymore.

It's really a nice decompressor, really fast with a reasonable compression ratio.
chb is offline  
Old 06 September 2017, 17:18   #3
NorthWay
Registered User
 
Join Date: May 2013
Location: Grimstad / Norway
Posts: 362
Didn't the XPK suite have some tool to dump info about the implementations - IIRC there was one doing >800K/s?
NorthWay is offline  
Old 07 September 2017, 08:09   #4
temisu
Registered User

 
Join Date: Mar 2017
Location: Tallinn / Estonia
Posts: 17
Quote:
Originally Posted by NorthWay View Post
Didn't the XPK suite have some tool to dump info about the implementations - IIRC there was one doing >800K/s?
In the official pages there is this https://www.dstoecker.eu/xpkLibTest.txt

However it is made on 68060, so it is directly not usable. But I think we can see there that the speedy ones are not the best compression wise

There are some candidates though: FAST (no surprise there) and SLZ3 (which is a bit surprising). Maybe you can try those?
temisu is offline  
Old 07 September 2017, 09:17   #5
NorthWay
Registered User
 
Join Date: May 2013
Location: Grimstad / Norway
Posts: 362
My faint memory tells me this particular one stored the compressed data in reverse direction. I could be wrong about the speed of it.
NorthWay is offline  
AdSense AdSense  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fastest,Easiest,Cheapest way to transfer adf images between PC and Amiga(mostly 500) ikonsgr support.Hardware 129 14 September 2017 10:08
Amiga 500 Rev.6A VS Amiga 500 Plus with 2MB chip and ACA 500 turrican9 support.Hardware 0 24 December 2016 02:16
Fastest Amiga Games Djay Nostalgia & memories 73 09 June 2016 21:42
Fastest Amiga Driving Games exoticaga Nostalgia & memories 29 17 February 2016 22:32
de-interlace algorythm VermillioN request.UAE Wishlist 4 15 August 2004 05:50

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 01:51.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Page generated in 0.10474 seconds with 12 queries