[FFmpeg-cvslog] r17543 - trunk/libavcodec/x86/cpuid.c

[Michael Niedermayer]

On Tue, Feb 24, 2009 at 11:18:48AM +0800, Zuxy Meng wrote:
> Hi,
> 
> "ReimarD?ffinger" <Reimar.Doeffinger at stud.uni-karlsruhe.de> ???? 
> news:20090223165111.GA13666 at 1und1.de...
> > On Mon, Feb 23, 2009 at 04:53:40PM +0100, zuxy wrote:
> >> Author: zuxy
> >> Date: Mon Feb 23 16:53:39 2009
> >> New Revision: 17543
> >>
> >> Log:
> >> Remove CPUID availability check on AMD64 as it's architectural.
> >
> > Do you actually have a reference for that?
> > My architecture reference manuals state no such thing, which is why it
> > was done like this (not that I expect any CPU to not support it).
> > The statements on SSE etc. support are a bit ambiguous, too, but the
> > CPUID description is the one that sound like you absolutely have to
> > check for it always...
> 
> Long mode support itself is reported thru CPUID, and an AMD64 kernel won't 
> ever boot if it can't detect the existence of CPUID.
> 

> Besides, GCC thinks it's architectural.

GCC didnt design x86_64/AMD64 only intel and amd can decide what is
part of their architecture.

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are too smart to engage in politics are punished by being
governed by those who are dumber. -- Plato 
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