Date: Mon, 04 Apr 2005 12:53:26 +0400 From: "Andrew P." <infofarmer@mail.ru> To: Dick Hoogendijk <dick@nagual.st> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: AMD64 optimization on FreeBSD 5.4 i386 Message-ID: <42510086.4000205@mail.ru> In-Reply-To: <20050404081350.GA9048@lothlorien.nagual.st> References: <20050404073532.GA13922@localhost> <20050404081350.GA9048@lothlorien.nagual.st>
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Dick Hoogendijk wrote: > On 04 Apr Bachelier Vincent wrote: > >>Does I compile with march=k8 under cflags ? >>for example: CFLAGS=-O2 -march=k8 -pipe >> CXXFLAGS=$CFLAGS >> >>Well, what do you think ? >>could I optimize more than CPUTYPE=k8 ? > > > Don't have an answer to /your/ question, but mine is related (I think). > Is it still advisable to have "-O -pipe" in /etc/make.conf? > I have a duron 800. Does the "-O2" flag give more errors or is it better > than using the -O? To quote the Handbook: ``The optimization -O2 is much slower, and the optimization difference between -O and -O2 is normally negligible.'' The only reason one would want to use -O2 would be perfectionism, I think :) Best wishes, Andrew P.
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