Date: Thu, 16 Aug 2001 16:20:35 -0400 (EDT) From: Kenneth W Cochran <kwc@world.std.com> To: freebsd-stable@freebsd.org Subject: New kernel option CPU_ENABLE_SSE Message-ID: <200108162020.QAA14274@world.std.com>
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Hello -stable:
A new kernel config option CPU_ENABLE_SSE has appeared. :)
From recent cvsup of 15 August:
Edit src/sys/i386/conf/LINT
Add delta 1.749.2.77 2001.08.15.01.23.49 peter
So far I can't find any documentation about this feature
besides the brief comment in LINT, the release-notes mention
and the cvs log message (other pointers appreciated).
Questions:
Why might someone want to include this option (or not)?
Does this option entail a "cost?"
Assuming CPU_ENABLE_SSE is a Good Thing, why not make it
"default" with the "cpu I686_CPU" kernel config directive
(similar to F00F_HACK auto-include with I586_CPU)?
I guess my question "boils down" as "why not support it
automa{t,g}ically?" :) Either way is ok with me; I'm just
looking for an explanation and/or documentation.
Thanks,
-kc
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