From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 10895 invoked by alias); 3 Jul 2015 18:42:23 -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 10851 invoked by uid 48); 3 Jul 2015 18:42:18 -0000 From: "hjl.tools at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/66334] cleanup block fails to initialize EBX Date: Fri, 03 Jul 2015 18:42:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 6.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: hjl.tools at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 6.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: 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: 2015-07/txt/msg00301.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66334 --- Comment #8 from H.J. Lu --- (In reply to Vladimir Makarov from comment #7) > I've looked at this. Insn 34 is transformed into > > ebx=ebx > > as pseudo 87 gets ebx. At the very end. LRA removes the useless insn. > Therefore there is no insn setting ebx. > > H.J., is it really a problem? The problem is although ebx, which is used for PIC, is callee saved, but ebx has junk when called from BUILT_IN_UNWIND_RESUME. LRA should reinitialize it.