From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27595 invoked by alias); 2 Dec 2014 15:54:24 -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 27571 invoked by uid 48); 2 Dec 2014 15:54:20 -0000 From: "dmalcolm at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/64003] valgrind complains about get_attr_length_nobnd in insn-attrtab.c from i386.md Date: Tue, 02 Dec 2014 15:54:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 5.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dmalcolm 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-Flags: X-Bugzilla-Changed-Fields: attachments.created 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: 2014-12/txt/msg00235.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64003 --- Comment #10 from dmalcolm at gcc dot gnu.org --- Created attachment 34167 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34167&action=edit Log from gdb session, with a conditional breakpoint to trap uninitialized reads This is a log of a gdb session debugging cc1 compiling the reproducer from comment #7, using the instrumentation patch from comment #8. I put a breakpoint on: fancy_element::operator int () const with condition that result == 0xabababab to handle reads of uninitialized elements from insn_lengths[]. I took a backtrace both times that the conditional breakpoint occurred.