Date: Sun, 21 Nov 2004 00:11:59 +0100 From: Gert Cuykens <gert.cuykens@gmail.com> To: Peter Wemm <peter@wemm.org> Cc: freebsd-amd64@freebsd.org Subject: Re: cputype FX-53 Message-ID: <ef60af090411201511909b766@mail.gmail.com> In-Reply-To: <200411201335.02738.peter@wemm.org> References: <ef60af0904111923143b6e9355@mail.gmail.com> <200411201335.02738.peter@wemm.org>
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On Sat, 20 Nov 2004 13:35:02 -0800, Peter Wemm <peter@wemm.org> wrote: > On Friday 19 November 2004 11:14 pm, Gert Cuykens wrote: > > > > Hi whats the cputype of a FX-53 please > > You don't need to set CPUTYPE yet. If you really want to, you could use > any of "k8", "opteron" or "athlon64". The "k8" label is probably what > you should use, if you really want to set something since that is the > fundamental cpu core type that is shared across all the > athlon64/opteron family at this point in time. There will be a k9 and > k10 core at some point and it is probably safe to assume that they'll > be different enough in features or optimizer strategies to merit a new > gcc optimizer target. > > For 64 bit intel cpus, you can use "nocona". > > At some point, not setting CPUTYPE will target the lowest common > features of both cpus, eg: no SSE3, no 3dnow, etc. But for now, gcc > doesn't use sse3 or 3dnow with the default settings. > > There is a small optimizer benefit to setting CPUTYPE="nocona" for intel > cpus though. It causes the gcc optimizer to use the pentium4 > insanely-long-pipeline optimizer strategies instead of something > suitable for the AMD cpus. It also seems to cause gcc to make extra > effort to avoid partial register pipeline stalls. > -- > Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com > "All of this is for nothing if we don't go to the stars" - JMS/B5 > ok thx did not understand much of it doh but i did understand i can fill in cputype="hot air conditioning device" and it will still work the same
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