From owner-freebsd-current Sun Feb 9 6:10:16 2003 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 F14CE37B401 for ; Sun, 9 Feb 2003 06:10:14 -0800 (PST) Received: from skywalker.creative.net.au (skywalker.creative.net.au [203.56.168.1]) by mx1.FreeBSD.org (Postfix) with SMTP id A793F43F3F for ; Sun, 9 Feb 2003 06:10:13 -0800 (PST) (envelope-from freebsd@skywalker.creative.net.au) Received: (qmail 64216 invoked by uid 1008); 9 Feb 2003 14:10:06 -0000 Date: Sun, 9 Feb 2003 22:10:06 +0800 From: Adrian Chadd To: David Schultz Cc: Terry Lambert , Ray Kohler , freebsd-current@FreeBSD.ORG Subject: Re: Compiling with high optimization? Message-ID: <20030209141006.GB33928@skywalker.creative.net.au> References: <20030208173756.GA56030@arkadia.nv.cox.net> <20030208232724.GA20435@HAL9000.homeunix.com> <3E459BF3.BB3FC381@mindspring.com> <20030209002542.GA20812@HAL9000.homeunix.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030209002542.GA20812@HAL9000.homeunix.com> User-Agent: Mutt/1.4i Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, Feb 08, 2003, David Schultz wrote: > Yes, the possibility of being bitten by compiler bugs is certainly > higher with higher optimization levels. Alpha with -O2 seems to > have been broken for years, and I have seen strange things happen > on IA64 as well. But the i386 code generators have received much > wider testing and debugging, so there is somewhat less danger there. Yet squid under i386 freebsd is .. well, finds -O bugs in gcc. We gave up trying -O under FreeBSD a long time ago. :-) (note: I've seen better performance gains by telling gcc exactly what CPU you have over -O65536 ..) Adrian -- Adrian Chadd learning is bad it just makes the people around you dumber (angryskul == alfred@irc) :( To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message