Gentoo Archives: gentoo-dev

From: Matt Turner <mattst88@g.o>
To: gentoo-dev@l.g.o
Subject: Re: [gentoo-dev] Re: New global USE flag "neon" for ARM NEON optimization(s)
Date: Fri, 23 Dec 2011 13:10:33
Message-Id: CAEdQ38FU+JX+Y9v-U5MuYMeCW4tJdvL6ucAUmPj4MQ7vs3ESuA@mail.gmail.com
In Reply to: [gentoo-dev] Re: New global USE flag "neon" for ARM NEON optimization(s) by Duncan <1i5t5.duncan@cox.net>
On Fri, Dec 23, 2011 at 4:26 AM, Duncan <1i5t5.duncan@×××.net> wrote:
> Samuli Suominen posted on Thu, 22 Dec 2011 21:03:41 +0200 as excerpted: > >> i'll add USE=neon to use.desc and punt the local descriptions if nobody >> objects >> >> media-libs/libpng: support ARM NEON cpu instruction set >> media-libs/vo-aacenc: Enable neon cpu instructions >> media-video/ffmpeg: Enables NEON optimizations for arm processors. >> media-video/libav: Enable NEON optimizations for arm processors. >> media-video/vlc: Enables NEON optimizations for arm processors. >> x11-libs/pixman: Enables NEON optimizations for ARM processors. > > For users not familiar with the ARM arch, neon is arguably more likely to > be associated with net-libs/neon.  Certainly that's what I would have > immediately thought, tho my only familiarity with the library is as a > dependency that IIRC used to trigger lots of subversion rebuilds, etc > (now days I don't even have subversion on the system, it's all git, but > according to equery d, neon is still required by musicbrainz). > > As such, to avoid confusion I'd suggest arch-neon or arm-neon (or armneon/ > archneon) if it's to be a global flag.
Ugh. NEON (the SIMD extensions) are turned on by the neon flag much more often than support for net-libs/neon is. Let's not rename USE flags like this.

Replies

Subject Author
[gentoo-dev] Re: New global USE flag "neon" for ARM NEON optimization(s) Duncan <1i5t5.duncan@×××.net>