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Re: allowed uses of non-baseline CPU extensions




On Thu, Oct 05, 2017 at 09:12:05AM +0100, Simon McVittie wrote:
> On Thu, 05 Oct 2017 at 03:52:56 +0200, Adam Borowski wrote:

> > So, let's list packages that want non-baseline:
> > * multiple variants: package src:x provides x-unoptimized, x-sse3 and
> >   x-avx1048576.  Clearly legitimate and a good idea.
> 
> For libraries this is perhaps better done via hwcaps
> (like /usr/lib/i386-linux-gnu/cmov/libfoo.so.0 being an i686 version of
> /usr/lib/i386-linux-gnu/libfoo.so.0 before the baseline moved to i686),
> although that doesn't solve anything for non-library executables.

Unfortunately it looks like hwcaps are supported only on a limited set of
archs, and in particular not on amd64 (hence there is no sse3 or avx hwcap).
See ld.so(8) and sysdeps/x86_64/dl-procinfo.c in src:glibc.

-- 
⢀⣴⠾⠻⢶⣦⠀  Sébastien Villemot
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