From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25276 invoked by alias); 6 Jan 2015 04:33:50 -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 25226 invoked by uid 48); 6 Jan 2015 04:33:41 -0000 From: "cubbi at cubbi dot org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/64497] std::scalbln does not round correctly for long doubles Date: Tue, 06 Jan 2015 04:33:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 4.8.2 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: cubbi at cubbi dot org 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: 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: 2015-01/txt/msg00280.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64497 Sergey Zubkov changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |cubbi at cubbi dot org --- Comment #5 from Sergey Zubkov --- FYI, cppreference got that phrasing from POSIX's "If the correct value would cause underflow, and is representable, a range error may occur and the correct value shall be returned.", which is a part of its optional IEC 60559 Floating-Point extension to the C standard: http://pubs.opengroup.org/onlinepubs/9699919799/functions/scalbln.html