Date: Fri, 18 Aug 2006 12:05:21 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: "Sean M." <sigma_zk@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: GCC - Optimal Optimization Message-ID: <20060818170521.GC74158@dan.emsphone.com> In-Reply-To: <20060818161057.60674.qmail@web52309.mail.yahoo.com> References: <20060818161057.60674.qmail@web52309.mail.yahoo.com>
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In the last episode (Aug 18), Sean M. said: > With GCC 3.4.4, what are the best CFLAGS to use for an AMD Duron ~1000 > MHz? By "best" I mean creating the fastest programs that exploit fully > all of the architecture's features, without creating a "noticible" > increase in size. To date I've been using > CFLAGS="-O3 -march=athlon-xp -mfp-math=sse -funroll-loops -pipe > -ffast-math" There is no magic set of flags, else they would already be the default :) Each program will have its own "best" set of flags. See http://www.coyotegulch.com/products/acovea/index.html for some analyses of options in gcc 3.4 and 4.0. -- Dan Nelson dnelson@allantgroup.com
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