From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8628 invoked by alias); 3 Jan 2015 00:23:43 -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 8590 invoked by uid 48); 3 Jan 2015 00:23:39 -0000 From: "gcc-bugzilla at contacts dot eelis.net" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/64476] New: std::uninitialized_copy tests assignability the wrong way, resulting in performance pessimization Date: Sat, 03 Jan 2015 00:23:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Version: 5.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: gcc-bugzilla at contacts dot eelis.net X-Bugzilla-Status: UNCONFIRMED 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_id short_desc product version bug_status bug_severity priority component assigned_to reporter Message-ID: 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: 2015-01/txt/msg00079.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64476 Bug ID: 64476 Summary: std::uninitialized_copy tests assignability the wrong way, resulting in performance pessimization Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: gcc-bugzilla at contacts dot eelis.net It does: typedef typename iterator_traits<_InputIterator>::reference _RefType; const bool __assignable = is_assignable<_ValueType1, _RefType>::value; but should do: typedef typename iterator_traits<_ForwardIterator>::reference _RefType; const bool __assignable = is_assignable<_RefType, _ValueType1>::value;