From owner-freebsd-current@FreeBSD.ORG Wed Mar 9 09:43:47 2005 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A349B16A4CE for ; Wed, 9 Mar 2005 09:43:47 +0000 (GMT) Received: from smtpout.mac.com (smtpout.mac.com [17.250.248.45]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3481F43D1F for ; Wed, 9 Mar 2005 09:43:47 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from mac.com (smtpin01-en2 [10.13.10.146]) by smtpout.mac.com (Xserve/MantshX 2.0) with ESMTP id j299hjJg013551; Wed, 9 Mar 2005 01:43:45 -0800 (PST) Received: from [192.168.1.6] (pool-68-161-53-96.ny325.east.verizon.net [68.161.53.96]) (authenticated bits=0)j299hhMg002439; Wed, 9 Mar 2005 01:43:44 -0800 (PST) In-Reply-To: <20050309092749.GA72315@stud.fit.vutbr.cz> References: <20050309092749.GA72315@stud.fit.vutbr.cz> Mime-Version: 1.0 (Apple Message framework v619.2) Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: <7b51c88b50f4f6b9244a901d05a5c284@mac.com> Content-Transfer-Encoding: 7bit From: Charles Swiger Date: Wed, 9 Mar 2005 04:43:42 -0500 To: Divacky Roman X-Mailer: Apple Mail (2.619.2) cc: current@freebsd.org Subject: Re: amd64 default CFLAGS X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Mar 2005 09:43:47 -0000 On Mar 9, 2005, at 4:27 AM, Divacky Roman wrote: > why is it necessary (if its at all) to have this: > -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx -mno-3dnow in default CFLAGS > for amd64 > architecture? > > does it serve anypurpose? sse is used in amd64 code so I dont see why > we > disables gcc to use it.. gcc-3.4.x for AMD64 apparently has a number of code generation bugs and trying to do MMX or SSE on the AMD64 platform is not going to be entirely reliable until those issues get worked out. -- -Chuck