X-Spam-Check-By: sourceware.org Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Subject: RE: possible compiler optimization error Date: Thu, 28 Jun 2007 16:11:18 -0400 Message-ID: In-Reply-To: <46840F0E.9EA8612B@dessent.net> References: <46840F0E.9EA8612B@dessent.net> From: "Frederich, Eric P21322" To: X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id l5SKBVH1007256 > -----Original Message----- > From: cygwin-owner@cygwin.com On Behalf Of Brian Dessent > Sent: Thursday, June 28, 2007 3:42 PM > To: cygwin@cygwin.com > Subject: Re: possible compiler optimization error > > > But both of these are too new to be in Cygwin's gcc 3.4.x so this is > kind of off-topic. > > Brian > To bring things back on topic. The programs I am porting from Solaris to Linux and Windows need to run on a variety of hardware. Without using -march and creating different libraries and binaries for each piece of hardware, what would a good set of compiler options be? You said that combining -march=i686 and -msse2 didn't make too much sense. So without setting -march, what all should I be setting? On my laptop with CPU-Z I see MMX, SSE, and SSE2. On my Opteron Linux box I obviously see a lot more when I cat /proc/cpuinfo. If I just use what is common between them, -mmmx, -msse, and -msse2 I should be free of floating point errors and hopefully get some performance increase. Should I be using -mmmx if I'm also using -msse and -msse2? I am comfortable locking out users without sse and sse2 since most of our users are using computers that are no more than 2 or 3 years old. Again, thanks a lot for your help. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/