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From: John Baldwin <jhb@freebsd.org>
To: Jan Beich <jbeich@tormail.org>
Subject: Re: svn commit: r253802 - head/contrib/llvm/tools/clang/lib/Headers
Date: Tue, 30 Jul 2013 12:14:48 -0400
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 (bigwig.baldwin.cx); Tue, 30 Jul 2013 12:18:42 -0400 (EDT)
Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 src-committers@freebsd.org, Dimitry Andric <dim@freebsd.org>
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On Tuesday, July 30, 2013 9:33:51 am Jan Beich wrote:
> Dimitry Andric <dim@FreeBSD.org> writes:
> 
> > Author: dim
> > Date: Tue Jul 30 12:33:21 2013
> > New Revision: 253802
> > URL: http://svnweb.freebsd.org/changeset/base/253802
> >
> > Log:
> >   Pull in r186696 from upstream clang trunk:
> >   
> >     This patch implements __get_cpuid_max() as an inline and __cpuid()
> >     and __cpuid_count() as macros to be compatible with GCC's cpuid.h.
> [...]
> > +#define bit_SSE41       0x00080000
> > +#define bit_SSE42       0x00100000
> 
> GCC's spelling is different
> 
>   $ fgrep -r bit_SSE4 /usr/local/lib/gcc48/**/
>   /usr/local/lib/gcc48/**/cpuid.h:#define bit_SSE4_1        (1 << 19)
>   /usr/local/lib/gcc48/**/cpuid.h:#define bit_SSE4_2        (1 << 20)
>   /usr/local/lib/gcc48/**/cpuid.h:#define bit_SSE4a (1 << 6)

Note that this was a clean-room implementation, so I based this on the names 
in the Intel SDM.  I was actually hoping for discussion on the clang lists
perhaps along the lines of not supplying these constants at all, or only a
subset, etc.

-- 
John Baldwin