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From: Marius Bakke <mbakke@fastmail.com>
To: Leo Famulari <leo@famulari.name>, Tobias Geerinckx-Rice <me@tobias.gr>
Cc: guix-devel@gnu.org
Subject: Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled	libjpeg.
Date: Sun, 27 Nov 2016 22:50:35 +0100	[thread overview]
Message-ID: <87wpfotwwk.fsf@kirby.i-did-not-set--mail-host-address--so-tickle-me> (raw)
In-Reply-To: <20161127214119.GB30774@jasmine>

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Leo Famulari <leo@famulari.name> writes:

> On Sun, Nov 27, 2016 at 10:02:35PM +0100, Tobias Geerinckx-Rice wrote:
>> Leo,
>> 
>> On 27/11/16 21:56, Leo Famulari wrote:
>> > Will this work on nachines that don't support SSE? My understanding is
>> > that we don't wish to require it.
>> 
>> Why wouldn't it?
>> 
>> I don't often use Icecat, but when I do... I don't see why it would
>> require SSE by default. ;-) And it's not like we ever patched it to use
>> IJG's libjpeg to begin with.
>
> 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?

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

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  reply	other threads:[~2016-11-27 21:50 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 [this message]
2016-11-27 22:28           ` Marius Bakke
2016-11-27 22:44             ` Leo Famulari
2016-11-27 22:43           ` Leo Famulari
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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