Date: Mon, 7 Jan 2002 14:51:24 -0700 From: Nate Williams <nate@yogotech.com> To: John Baldwin <jhb@FreeBSD.ORG> Cc: Nate Williams <nate@yogotech.com>, arch@FreeBSD.ORG, Dan Eischen <eischen@vigrid.com> Subject: Re: Request for review: getcontext, setcontext, etc Message-ID: <15418.6236.977377.975054@caddis.yogotech.com> In-Reply-To: <XFMail.020107134817.jhb@FreeBSD.org> References: <15418.5641.919327.356015@caddis.yogotech.com> <XFMail.020107134817.jhb@FreeBSD.org>
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> >> > Also, forgive my ignorance, but why are we using fnsave instead of > >> > fsave? From my reading of the x86 manuals, it would seem that there is > >> > the possibility of getting bogus FPU results with fnsave (vs. fsave) > >> > since by using fsave, we give the FPU a chance to finish up the current > >> > FPU operations before we save the state? I could see where they might > >> > be a race where we might end up storing intermediate results of the FPU > >> > in some instances. > >> > > >> > Or, is there something else I'm missing? (The reason I ask is that the > >> > JDK uses fsave to be 'safe', but maybe it's not buying us anything other > >> > than warm fuzzies. :) > >> > >> I don't know :-) That's what it was using when John Birrell was > >> maintaining libc_r. I can always change it... > > > > How about it John? Why the use of 'fnsave' when storing FPU context > > vs. using fsave? > > Hmm, wrong John. You want jb@ I believe. :) Right, sorry John. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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