From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id C4718385481F; Wed, 17 Mar 2021 21:23:12 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C4718385481F From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/99637] bit_cast doesn't work with padding bits and it should Date: Wed, 17 Mar 2021 21:23:12 +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: 11.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: redi at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: 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: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Mar 2021 21:23:12 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99637 --- Comment #4 from Jonathan Wakely --- I think the relevant sentence is "Each bit of the value representation of t= he result is equal to the corresponding bit in the object representation of fr= om." For one of the bits in the result, there is no corresponding bit in the obj= ect representation of from. So the result cannot be created.=