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From: Leo Famulari <leo@famulari.name>
To: Marius Bakke <mbakke@fastmail.com>
Cc: guix-devel@gnu.org
Subject: Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg.
Date: Sun, 27 Nov 2016 17:43:19 -0500	[thread overview]
Message-ID: <20161127224319.GA1254@jasmine> (raw)
In-Reply-To: <87wpfotwwk.fsf@kirby.i-did-not-set--mail-host-address--so-tickle-me>

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On Sun, Nov 27, 2016 at 10:50:35PM +0100, Marius Bakke wrote:
> Leo Famulari <leo@famulari.name> writes:
> > I'm not sure, but the comment seems to indicate that we don't want to
> > use it:
> >
> > ;; According to
> > ;; http://sourceforge.net/projects/libjpeg-turbo/ ,
> > ;; "libjpeg-turbo is a derivative of libjpeg that
> > ;; uses MMX, SSE, SSE2, and NEON SIMD instructions
> > ;; to accelerate baseline JPEG compression/
> > ;; decompression", so we had better not use it
> 
> SSE is pentium III, and SSE2 was introduced in Pentium IV. MMX is even
> older. Are we really committed to supporting 15+ year old hardware?

See this earlier thread:

http://lists.gnu.org/archive/html/guix-devel/2016-07/msg01534.html

I think it's fine to use libjpeg-turbo if it can run on those older
processors, or if we decide to drop support for them.

> The NEON SIMD instruction seems to be ARM-specific and is available at
> least on Cortex A8, which is an ARMv7 design.

The extremely popular Cortex A7 [0] also has NEON SIMD.

[0] Allwinner A20

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  parent reply	other threads:[~2016-11-27 22:43 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-27 20:17 [PATCH 1/2] gnu: Add libjpeg-turbo Tobias Geerinckx-Rice
2016-11-27 20:17 ` [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg Tobias Geerinckx-Rice
2016-11-27 20:56   ` Leo Famulari
2016-11-27 21:02     ` Tobias Geerinckx-Rice
2016-11-27 21:41       ` Leo Famulari
2016-11-27 21:50         ` Marius Bakke
2016-11-27 22:28           ` Marius Bakke
2016-11-27 22:44             ` Leo Famulari
2016-11-27 22:43           ` Leo Famulari [this message]
2016-11-27 23:15         ` Tobias Geerinckx-Rice
2016-11-27 23:20           ` Tobias Geerinckx-Rice
2016-11-27 23:42             ` Leo Famulari
2016-11-27 23:27           ` Leo Famulari
2016-11-27 20:55 ` [PATCH 1/2] gnu: Add libjpeg-turbo Leo Famulari
2016-11-27 21:12   ` Tobias Geerinckx-Rice
2016-11-27 21:36     ` Leo Famulari

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