Date: Thu, 1 Jul 1999 20:12:36 -0400 From: Randall Hopper <aa8vb@ipass.net> To: Frode Vatvedt Fjeld <frodef@acm.org>, "Daniel J. O'Connor" <darius@dons.net.au>, Geff Hanoian <boing@kusanagi.boing.com> Cc: freebsd-stable@freebsd.org, multimedia@freebsd.org Subject: Re: MMX Message-ID: <19990701201236.A5532@ipass.net> In-Reply-To: <2hwvwnqh7g.fsf@dslab7.cs.uit.no>; from Frode Vatvedt Fjeld on Tue, Jun 29, 1999 at 03:17:23PM %2B0200 References: <XFMail.990630103147.darius@dons.net.au> <199906300229.TAA06545@kusanagi.boing.com> <2hwvwnqh7g.fsf@dslab7.cs.uit.no> <XFMail.990630103147.darius@dons.net.au> <2hwvwnqh7g.fsf@dslab7.cs.uit.no>
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Frode Vatvedt Fjeld:
|What is the preferred way for my application to determine if the CPU
|is MMX-capable?
Daniel J. O'Connor:
|Use some MMX instructions and see if you catch a SIGILL or not? :)
Geff Hanoian:
| __asm __volatile(
| ".byte 0x0f, 0xa2;"
Seems like this would be perfect for the sysctl MIB. We have a few
CPU-related ones already:
> sysctl -a | grep -i cpu
kern.ccpu: 1948
hw.ncpu: 1
What about:
hw.cpu.has_mmx: 1
hw.cpu.has_3dnow: 1
hw.cpu.has_sse: 0
In leiu of that, I believe I recall reading that the SIGILL approach works
on FreeBSD. Seems like Roger Hardiman uses/used MMX on FreeBSD for some of
his signal processing work. You might chat with him.
Randall
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