Subject: Re: Floating point emulation
To: Nathan J. Williams <email@example.com>
From: Peter Seebach <firstname.lastname@example.org>
Date: 11/05/2005 23:20:47
In message <email@example.com>, "Nathan J. Willia
>firstname.lastname@example.org (Peter Seebach) writes:
>> On some BSD somewhere, I was once told to use floating point emulation in
>> the kernel so that the kernel wouldn't have to save and restore floating
>> point registers as often when processing system calls.
>Right. By convention, the kernel isn't supposed to use hardware FP
>> The MATH_EMULATE stuff in options(4) seems to imply that this option
>> is useless unless your hardware lacks hardware floating point
>MATH_EMULATE is for the kernel to trap and emulate userspace FPU
>instructions on processor families that might or might not have FPUs,
>such as PowerPC or MIPS.
So the kernel already DTRT anyway? Or is this a separate option, such