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Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpe
From: |
Leo Famulari |
Subject: |
Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg. |
Date: |
Sun, 27 Nov 2016 17:43:19 -0500 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Sun, Nov 27, 2016 at 10:50:35PM +0100, Marius Bakke wrote:
> Leo Famulari <address@hidden> 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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- [PATCH 1/2] gnu: Add libjpeg-turbo., Tobias Geerinckx-Rice, 2016/11/27
- [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Tobias Geerinckx-Rice, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Leo Famulari, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Tobias Geerinckx-Rice, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Leo Famulari, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Marius Bakke, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Marius Bakke, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Leo Famulari, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg.,
Leo Famulari <=
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Tobias Geerinckx-Rice, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Tobias Geerinckx-Rice, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Leo Famulari, 2016/11/27
- Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg., Leo Famulari, 2016/11/27
Re: [PATCH 1/2] gnu: Add libjpeg-turbo., Leo Famulari, 2016/11/27