From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 13793 invoked by alias); 10 Nov 2013 19:42:25 -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 13742 invoked by uid 48); 10 Nov 2013 19:42:22 -0000 From: "ktietz at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/42970] Missed unused function return value elimination Date: Sun, 10 Nov 2013 19:42:00 -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: 4.5.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: ktietz at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: jamborm at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc 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: 2013-11/txt/msg00971.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42970 Kai Tietz changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ktietz at gcc dot gnu.org --- Comment #1 from Kai Tietz --- This testcase seems to be invalid ... The function quantum_gate_counter is visible out-side of the current TU. So nobody can predict that return-type isn't used by external users. So optimization can be done. By adding static to the prototype of quantum_gate_counter for making it visible only to local TU, things getting optimized as desired.