Date: Sat, 18 Mar 2000 11:00:22 -0800 From: "David O'Brien" <obrien@FreeBSD.ORG> To: =?iso-8859-1?Q?Thomas_K=F6llmann?= <koellmann@gmx.net> Cc: R Joseph Wright <rjoseph@nwlink.com>, freebsd-current@FreeBSD.ORG Subject: Re: gcc -Os optimisation broken (RELENG_4) Message-ID: <20000318110022.A60879@dragon.nuxi.com> In-Reply-To: <20000318031845.A1816@home.net>; from koellmann@gmx.net on Sat, Mar 18, 2000 at 03:18:45AM %2B0100 References: <20000317125045.A15480@schumann.cx> <Pine.BSF.4.21.0003170922440.9372-100000@mammalia.sea> <20000318031845.A1816@home.net>
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On Sat, Mar 18, 2000 at 03:18:45AM +0100, Thomas Köllmann wrote: > | Perhaps this is a bit off topic, but can the pentium optimisations be used > | for AMD K6 processors? > > I did a `make world' yesterday with > CFLAGS= -O2 -pipe -march=pentium > COPTFLAGS= -O2 -pipe -march=pentium ..snip.. > If it doesn't I'll probably try `-03 -pipe -march=pentium' come next What are people hoping to get by doing this? Are you actually doing a scientific performance evaluation between the various optimization options??? Are are people just being macho, and thinking they are getting all this non-existent performance increase? "-O" is the only globally safe optimization on FreeBSD. -O2, etc.. causes various problems for various people in various ports, and parts of /usr/src/. If people are using these options just for fun, that is fine, BUT if you experience *any* problems with compiling using -O2, etc.. don't bug this list -- go bug the GCC people. -- -- David (obrien@NUXI.com) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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