Date: Fri, 6 Apr 2007 15:47:59 -0500 From: "Nikolas Britton" <nikolas.britton@gmail.com> To: "Ed Schouten" <ed@fxq.nl> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Do we need this junk? Message-ID: <ef10de9a0704061347q7f98a47aj634faa3e34d923e2@mail.gmail.com> In-Reply-To: <20070406201749.GF6950@hoeg.nl> References: <ef10de9a0704050258l4ea754b3n99a1239a81b844a0@mail.gmail.com> <20070405103708.GC842@turion.vk2pj.dyndns.org> <ef10de9a0704050839g7b873dabw5a5e211140781781@mail.gmail.com> <20070405.140109.39240822.imp@bsdimp.com> <ef10de9a0704060715s6b5957daq2fe8a465362e3446@mail.gmail.com> <20070406142326.GC6950@hoeg.nl> <ef10de9a0704060731l71186e1duea689617af407f4b@mail.gmail.com> <20070406153500.GE6950@hoeg.nl> <ef10de9a0704061243o6c7d3118neb702b7c925db97a@mail.gmail.com> <20070406201749.GF6950@hoeg.nl>
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On 4/6/07, Ed Schouten <ed@fxq.nl> wrote: > * Nikolas Britton <nikolas.britton@gmail.com> wrote: > > The legacy bits don't upset me, what upsets me is sacrificing > > performance so we can support a minority of legacy systems. IIRC? we > > could recode the Kernel for SSE2 math if the processor was guaranteed > > to have that SSE2. SSE2 adds 214 new instructions to the existing x86 > > instruction set. > > But SSE2 isn't even used in kernel space, not even on AMD64. As far as I > can see, the only exception I can see is pagezero. Just take a look at > src/sys/conf/kern.mk. If it's not even possible to use SSE2 in > kernelspace on amd64, why would it be possible to do so on i386? > Doesn't Apple use SSE2/3 in the kernel? IIRC Mac OS X (Darwin) running on a white box PC won't even boot if it's missing.
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