From owner-freebsd-amd64@FreeBSD.ORG Tue Jul 19 18:48:32 2005 Return-Path: X-Original-To: freebsd-amd64@freebsd.org Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9D21716A41F for ; Tue, 19 Jul 2005 18:48:32 +0000 (GMT) (envelope-from etoll@vipstructures.com) Received: from rodan.vipstructures.com (rodan.vipstructures.com [66.195.71.71]) by mx1.FreeBSD.org (Postfix) with ESMTP id 467E743D45 for ; Tue, 19 Jul 2005 18:48:31 +0000 (GMT) (envelope-from etoll@vipstructures.com) Received: from localhost (localhost.vipstructures.com [127.0.0.1]) by rodan.vipstructures.com (Postfix) with ESMTP id 41C111EE83D for ; Tue, 19 Jul 2005 14:48:31 -0400 (EDT) Received: from mothra.vipstructures.com (mothra.vipstructures.com [192.168.1.3]) by rodan.vipstructures.com (Postfix) with ESMTP id 103001EE83A for ; Tue, 19 Jul 2005 14:48:30 -0400 (EDT) X-MimeOLE: Produced By Microsoft Exchange V6.0.6487.1 content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Tue, 19 Jul 2005 14:50:03 -0400 Message-ID: <9BC86C67C3AF7646B9C5382020457A944E4DA4@VIP10-WIN2K> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: better optimization flags for opteron (amd64)// -ffast-math and -O3 are not friends Thread-Index: AcWMdoSlV9FGfr6URuC4oLOS3HrZ9gAG23Dg From: "Toll, Eric" To: Subject: RE: better optimization flags for opteron (amd64)// -ffast-math and -O3 are not friends X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Jul 2005 18:48:32 -0000 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...)