From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 17149 invoked by alias); 24 Jul 2013 15:45:54 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 16891 invoked by uid 48); 24 Jul 2013 15:45:51 -0000 From: "rearnsha at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/57967] [4.7 regresssion] Incorrect code generated on ARM with -fexpensive-optimizations Date: Wed, 24 Jul 2013 15:45:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: rtl-optimization X-Bugzilla-Version: 4.6.3 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: rearnsha at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status cf_reconfirmed_on cf_known_to_work short_desc everconfirmed Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-07/txt/msg01133.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57967 Richard Earnshaw changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2013-07-24 Known to work| |4.8.2 Summary|Incorrect code generated on |[4.7 regresssion] Incorrect |ARM with |code generated on ARM with |-fexpensive-optimizations |-fexpensive-optimizations Ever confirmed|0 |1 --- Comment #3 from Richard Earnshaw --- This appears to be a bug in combine. My suspicion lies with the new 4-way combine code that was added around gcc-4.6. Note that gcc-4.6 is no-longer being maintained. The problem seems to be fixed in 4.8 so a bisect might indicate a fix.