Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751203AbXAFHa4 (ORCPT ); Sat, 6 Jan 2007 02:30:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751207AbXAFHaz (ORCPT ); Sat, 6 Jan 2007 02:30:55 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:2063 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751206AbXAFHay (ORCPT ); Sat, 6 Jan 2007 02:30:54 -0500 Date: Fri, 5 Jan 2007 17:17:36 +0000 From: Pavel Machek To: Segher Boessenkool Cc: Albert Cahalan , akpm@osdl.org, linux-kernel@vger.kernel.org, s0348365@sms.ed.ac.uk, bunk@stusta.de, mikpe@it.uu.se, torvalds@osdl.org Subject: Re: kernel + gcc 4.1 = several problems Message-ID: <20070105171735.GA4745@ucw.cz> References: <787b0d920701032311l2c37c248s3a97daf111fe88f3@mail.gmail.com> <27e6f108b713bb175dd2e77156ef61d0@kernel.crashing.org> <787b0d920701040904i553e521fsb290acf5059f0b62@mail.gmail.com> <8069085182dff3b0e63a661d81804dbb@kernel.crashing.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8069085182dff3b0e63a661d81804dbb@kernel.crashing.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 673 Lines: 22 Hi! > >IMHO you should play such games with "g++ -O9", but > >that's > >a discussion for a different mailing list. > > For a different mailing list indeed; let me just point > out > that for certain important quite common cases it's an > ~50% > overall speedup. Hmm, what code was that? 'signed int does not wrap around' does not seem to provide _that_ much info... Pavel -- Thanks for all the (sleeping) penguins. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/