From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18557 invoked by alias); 27 Jan 2012 23:12:56 -0000 Received: (qmail 18537 invoked by uid 22791); 27 Jan 2012 23:12:55 -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, 27 Jan 2012 23:12:43 +0000 From: "joseph at codesourcery dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/52023] _Alignof (double) yields wrong value on x86 Date: Fri, 27 Jan 2012 23:30:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: joseph at codesourcery dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: 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: 2012-01/txt/msg03225.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023 --- Comment #10 from joseph at codesourcery dot com 2012-01-27 23:12:38 UTC --- I don't think the test programs here are strictly conforming - the offset could be bigger than the alignment, and alignments are values "representing the number of bytes between successive addresses at which a given object can be allocated" which I don't think necessarily have literally to count bytes (they may be some other less direct encoding of alignment requirements that satisfies the requirements of 6.2.8). But I think the bug is correct; alignof should return the least ABI alignment requirement for a type, which is the biggest requirement that the compiler can actually rely on when given a pointer to that type.