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PostPosted: Sun May 15, 2005 12:15 am 

Joined: Wed Oct 13, 2004 7:26 am
Posts: 348
Hi, I've just finished vectorization of the Adler32 algorithm. this algorithm is part of zlib and also libmhash (in a slightly different implementation but basically the same).

I got a 2-2.5x speed increase from this, I believe I could get a bit more out of it, but I describe the process in more detail in this paper: ... ltivec.pdf

Comments, suggestions welcome.

I will look into other parts of zlib, and also the runtime Altivec detection so that it will use the proper version automatically.


PostPosted: Wed May 18, 2005 11:06 pm 

Joined: Thu Nov 18, 2004 11:48 am
Posts: 110
The same algorithm is present in ffmpeg and could enjoy your optimization, pretty nice paper btw =)

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