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From: "Chris January" <chris AT atomice DOT net>
To: <cygwin AT cygwin DOT com>
Subject: RE: Bug fix to /proc/cpuinfo implementation
Date: Wed, 23 Jun 2004 18:07:16 +0100
Message-ID: <010c01c45944$8940ccb0$0207a8c0@avocado>
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> Hi
> 
> I hope I email to correct mailing list...
> 
> It seems that '/proc/cpuinfo' doesn't report 3dnow and 
> 3dnowext support correctly.
> 
> Because I had been using it for recognizing processor 
> features I looked briefly into fhandler_proc.cc (taken 
> freshly from cvs) and I think I fixed the problem. The 
> changed file compiles and *should* correctly detect presence 
> of 3dnow instruction support (by using AMD's 0x8000..1 
> extended function). I haven't have time to test it (= figure out how
> build+install process actually works) because I decided to 
> write my own
> cpuid detection routines from scratch instead.

Actually nearly all of the processor feature flags are wrong for AMD
processors. This is a known bug. Your patch looks to be going about the
right way to fix it. I'll try to add the rest of the AMD flags in.

Chris


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