From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3390 invoked by alias); 16 Nov 2014 19:04:58 -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 3368 invoked by uid 48); 16 Nov 2014 19:04:54 -0000 From: "segher at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug inline-asm/63900] memory constrains needlessly doing memory clobber Date: Sun, 16 Nov 2014 19:04:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: inline-asm X-Bugzilla-Version: 4.9.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: segher 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 cc resolution everconfirmed bug_severity 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: 2014-11/txt/msg01436.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63900 Segher Boessenkool changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |NEW Last reconfirmed| |2014-11-16 CC| |segher at gcc dot gnu.org Resolution|INVALID |--- Ever confirmed|0 |1 Severity|normal |enhancement --- Comment #3 from Segher Boessenkool --- Reopened; this is a perfectly valid missed optimisation. Nothing here does a "full memory clobber"; instead, CSE simply doesn't know how to handle a three-byte datum.