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Date: Thu, 20 Mar 2014 20:46:22 -0400
From: James Cloos <>
To: Bill Cox <>
Subject: Re: [PHC] Supporting AVX2/SSE2 or not with a single binary

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

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.

James Cloos <>         OpenPGP: 1024D/ED7DAEA6

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