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Re: FPU emulator unsafe for SMP?

To: Dominic Sweetman <>
Subject: Re: FPU emulator unsafe for SMP?
From: Florian Lohoff <>
Date: Wed, 20 Feb 2002 10:30:12 +0100
Cc: Jun Sun <>, "Kevin D. Kissell" <>,
In-reply-to: <>
Organization: rfc822 - pure communication
References: <> <> <> <> <002b01c1b607$6afbd5c0$10eca8c0@grendel> <> <00af01c1b9a2$c0d6d5f0$10eca8c0@grendel> <> <>
User-agent: Mutt/1.3.27i
On Wed, Feb 20, 2002 at 08:27:19AM +0000, Dominic Sweetman wrote:
> It may be heretical... but the lazy FPU context switch was invented
> for 16MHz CPUs using a write-through cache and non-burst memory, where
> saving 16 x 64-bit registers took 6us or so (and quite a bit less,
> later, to read them back).  Call it 8us.

We are still running on good ol Decstations *snief* Going the way to
make it SMP only like others archs seem to do it would be good.

Florian Lohoff                     +49-5201-669912
Nine nineth on september the 9th              Welcome to the new billenium

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