Date: Tue, 19 Jul 2005 14:50:03 -0400 From: "Toll, Eric" <etoll@vipstructures.com> To: <freebsd-amd64@freebsd.org> Subject: RE: better optimization flags for opteron (amd64)// -ffast-math and -O3 are not friends Message-ID: <9BC86C67C3AF7646B9C5382020457A944E4DA4@VIP10-WIN2K>
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15834270 =3D g++ dual operon 242's @ 1.6Ghz ea. default compile > -----Original Message----- > From: owner-freebsd-amd64@freebsd.org=20 > [mailto:owner-freebsd-amd64@freebsd.org] On Behalf Of=20 > Olexandr Konovalenko > Sent: Tuesday, July 19, 2005 11:26 AM > To: freebsd-amd64@freebsd.org > Subject: Re: better optimization flags for opteron (amd64)//=20 > -ffast-math and -O3 are not friends >=20 > hi! >=20 > I found that on my system combination of -ffast-math AND -O3=20 > is slower than -O0 on AMD64 (interestingly it is true for=20 > Xeon EM64 as well), how can it be? Also true for Opteron. My Score was: 15834270 =3D g++ dual operon 242's @ 1.6 default compile options, -O3 was 14944704 Interesting program, now *who/what* can beat the score of: 20152707 ???? (Post cpu specs please, I like to see an SMP Opteron 248 score...)
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