From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6408 invoked by alias); 2 Sep 2011 20:58:22 -0000 Received: (qmail 6398 invoked by uid 22791); 2 Sep 2011 20:58:22 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 02 Sep 2011 20:58:08 +0000 From: "eric-bugs at omnifarious dot org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/50087] [C++0x] Weird optimization anomaly with constexpr Date: Fri, 02 Sep 2011 20:58:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: eric-bugs at omnifarious dot 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-Changed-Fields: CC Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 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 X-SW-Source: 2011-09/txt/msg00174.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50087 eric-bugs at omnifarious dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |eric-bugs at omnifarious | |dot org --- Comment #5 from eric-bugs at omnifarious dot org 2011-09-02 20:57:45 UTC --- I thought that perhaps it was expected behavior. I still think it's a missed optimization opportunity. A call of a constexpr function can clearly, in all cases, be reduced to a constant expression if the arguments are also constant expressions. So it seems like the optimizer should do this if it can. But it isn't a 'bug' exactly, just more of a 'it could do this better'.