From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/5114 Path: news.gmane.org!not-for-mail From: Rich Felker Newsgroups: gmane.linux.lib.musl.general Subject: Re: Broken GCC versions: 4.8.2 and 4.9.0 Date: Sun, 11 May 2014 17:20:30 -0400 Message-ID: <20140511212030.GY26358@brightrain.aerifal.cx> References: <20140511010503.GA6502@brightrain.aerifal.cx> <20140511181020.0a8b66f1@free-electrons.com> <20140511161943.GR26358@brightrain.aerifal.cx> <20140511190320.GV26358@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1399843287 25710 80.91.229.3 (11 May 2014 21:21:27 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 11 May 2014 21:21:27 +0000 (UTC) Cc: Thomas Petazzoni , musl@lists.openwall.com To: James Cloos Original-X-From: musl-return-5119-gllmg-musl=m.gmane.org@lists.openwall.com Sun May 11 23:21:21 2014 Return-path: Envelope-to: gllmg-musl@plane.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1WjbBR-0003GL-6r for gllmg-musl@plane.gmane.org; Sun, 11 May 2014 23:21:21 +0200 Original-Received: (qmail 17581 invoked by uid 550); 11 May 2014 21:21:20 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 17573 invoked from network); 11 May 2014 21:21:20 -0000 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Original-Sender: Rich Felker Xref: news.gmane.org gmane.linux.lib.musl.general:5114 Archived-At: On Sun, May 11, 2014 at 04:08:37PM -0400, James Cloos wrote: > >>>>> "RF" == Rich Felker writes: > > RF> I've tested it on gcc.godbolt.org and others have tested with local > RF> gcc 4.8.2 and 4.9.0, probably distro-provided (I didn't ask). > > I just tried debian-sid's 4.9. That does show the bug. As does their > gcc-snapshot version (a 4.10 pre). > > Perhaps the distro(s) which have the bug with 4.8.2 backported the commit > where the bug first occurs? Sounds plausible. Maybe that will help find the offending commit. > RF> I wonder if the broken GCC is using isl/cloog > > I use the graphite optimizer on my Gentoo box (which generated the > assembly I quoted). The graphite code is only used when one or more > of -floop-interchange -floop-strip-mine -floop-block are specified. > > Testing with those options doesn't change the results. OK, ruled that out then. Rich