From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6071 invoked by alias); 31 Mar 2011 16:16:05 -0000 Received: (qmail 6055 invoked by uid 22791); 31 Mar 2011 16:16:04 -0000 X-SWARE-Spam-Status: No, hits=-2.8 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; Thu, 31 Mar 2011 16:16:01 +0000 From: "burnus at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/48390] Multiple setting to restricted pointer variable not optimized away X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: burnus at gcc dot gnu.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-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 Date: Thu, 31 Mar 2011 16:49:00 -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 X-SW-Source: 2011-03/txt/msg03361.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48390 --- Comment #1 from Tobias Burnus 2011-03-31 16:15:56 UTC --- For the C case: If "ptr" is also "restrict", the "*a = 1" is optimized away. Ditto for Fortran, if "ptr" is not a POINTER but a normal variable. In case of Fortran, the a/b/c cannot alias with ptr as none of has the TARGET attribute. I would expect the same for C99 as a/b/c are "restrict" but maybe I am wrong about the C99 semantics.