From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8789 invoked by alias); 26 Sep 2014 00:35:19 -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 8753 invoked by uid 48); 26 Sep 2014 00:35:14 -0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/63375] reordering of reads across fences Date: Fri, 26 Sep 2014 00:35:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 4.9.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia 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 component 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: 2014-09/txt/msg02445.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63375 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2014-09-26 Component|rtl-optimization |tree-optimization Ever confirmed|0 |1 --- Comment #2 from Andrew Pinski --- >A read within the region of code enclosed by barriers is being moved out of the regions. Actually no. What is happening is a volatile read is being changed into a non volatile one. This is happening during early SRA. Also this does not happen if val was a global variable rather than a stack variable.