Date: Tue, 21 May 1996 17:18:32 +1000 From: Bruce Evans <bde@zeta.org.au> To: asami@cs.berkeley.edu, wollman@lcs.mit.edu Cc: current@FreeBSD.org Subject: Re: some more on fast bcopy Message-ID: <199605210718.RAA26825@godzilla.zeta.org.au>
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>> Another place that it may help (and may fool lmbench and the likes :)
>> is libc, do I need to the complicated FP state save/restore in there
>> too? Or can that be a simple fnsave/frstor?
>Don't forget that you can't make this the default because libc doesn't
>know what CPU it's running on.
There should be a sysctl or something to determine the cpu class. I want
one for the fpu class. Currently we have hw.floatingpoint, but I want more
than a binary value: { FPU_EMULATED_AND_BROKEN, FPU_EMULATED, FPU_COPROCESSOR,
FPU_CPU }, where FPU_PROCESSOR might need to be multi-valued, and FPU_CPU
says that the fpu behaviour is determined by the cpu class.
Bruce
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