[vlc-devel] commit: Add a CPU capability for ARM NEON ( Rémi Denis-Courmont )

[Måns Rullgård]

"Rémi Denis-Courmont" <remi at remlab.net> writes:

> Le dimanche 6 septembre 2009 21:09:24 Måns Rullgård, vous avez écrit :
>> git at videolan.org (git version control) writes:
>> > vlc | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Sat Sep  5
>> > 16:56:25 2009 +0300| [600d29043eed8f9c3e848dddb79bb0e2e9a0a391] |
>> > committer: Rémi Denis-Courmont
>> >
>> > Add a CPU capability for ARM NEON
>> >
>> > Currently, detection is done at build time. Feel free to add run-time
>> > detect if you know how.
>>
>> Runtime detection is not possible in any sensible way.  I've discussed
>> various options with ARM, and we had some ideas for how to make life
>> easier for apps that need to know.  Unfortunately, I haven't had time
>> to do much yet.
>
> It seemed to me more like a toolchain problem; I cannot configure
> gcc to accept inline NEON assembly, while otherwise generating plain
> ARM machine code. On PPC and x86, we simply check whether one
> instruction triggers SIGILL.

Catching SIGILL isn't such a good idea in general, but if it works for
you, oh well.

-- 
Måns Rullgård
mans at mansr.com