From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 24763 invoked by alias); 21 Feb 2002 16:11:15 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 24718 invoked by uid 61); 21 Feb 2002 16:11:13 -0000 Date: Thu, 21 Feb 2002 08:26:00 -0000 Message-ID: <20020221161113.24717.qmail@sources.redhat.com> To: er@openoffice.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, mh@openoffice.org, nobody@gcc.gnu.org From: jakub@gcc.gnu.org Reply-To: jakub@gcc.gnu.org, er@openoffice.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, mh@openoffice.org, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org X-Mailer: gnatsweb 2.9.3 Subject: Re: optimization/4922: gcc-3.0.1 and 3.0.2 generate wrong code with -O2 X-SW-Source: 2002-02/txt/msg00545.txt.bz2 List-Id: Synopsis: gcc-3.0.1 and 3.0.2 generate wrong code with -O2 State-Changed-From-To: open->closed State-Changed-By: jakub State-Changed-When: Thu Feb 21 08:11:12 2002 State-Changed-Why: This is not a bug in gcc, but in your code. Code like: inline UINT16* RowPos() { return (UINT16*) &nAddress; } *RowPos() = (UINT16) nRow; does not obey aliasing rules (the code is accessing nAddress both as 32-bit integer and 16-bit integer). Please read info gcc about -fstrict-aliasing. http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4922