phc-discussions - Re: [PHC] Supporting AVX2/SSE2 or not with a single binary

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Message-ID: <m3eh1wl6o8.fsf@carbon.jhcloos.org>
Date: Thu, 20 Mar 2014 20:46:22 -0400
From: James Cloos <cloos@...loos.com>
To: Bill Cox <waywardgeek@...il.com>
Cc: discussions@...sword-hashing.net
Subject: Re: [PHC] Supporting AVX2/SSE2 or not with a single binary

AIUI, pixman has support for runtime detection of that sort (xorg
license).

Several of the audio/video codec libs should, too.

The vector sets provide a significant speed advantage for several crypto
routines.  As an example, IIRC, I recorded a speedup of 6x for poly1305
between the optimized C and avx2 versions.  And chacha20 saw about 4x.

-JimC
--
James Cloos <cloos@...loos.com>         OpenPGP: 1024D/ED7DAEA6