From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-382951-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 26544 invoked by alias); 8 Feb 2012 19:12:02 -0000
Received: (qmail 26533 invoked by uid 22791); 8 Feb 2012 19:12:01 -0000
X-SWARE-Spam-Status: No, hits=-2.0 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,SUBJ_OBFU_PUNCT_FEW,SUBJ_OBFU_PUNCT_MANY
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; Wed, 08 Feb 2012 19:11:42 +0000
From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/52175] New: [4.7 regression] ICE in maybe_record_trace_start after invalid dbr_schedule transformation
Date: Wed, 08 Feb 2012 19:12:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rsandifo 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: <bug-52175-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-02/txt/msg00885.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D52175

             Bug #: 52175
           Summary: [4.7 regression] ICE in maybe_record_trace_start after
                    invalid dbr_schedule transformation
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rsandifo@gcc.gnu.org


Created attachment 26618
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=3D26618
Testcase

The attached testcase fails on MIPS targets (e.g. mipsisa64-elf
and mips64-linux-gnu) when compiled with -O2 -g:

foo.c: In function =E2=80=98foo=E2=80=99:
foo.c:25:1: internal compiler error: in maybe_record_trace_start, at
dwarf2cfi.c:2231
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

The problem is that dbr_schedule is applying its PLUS/MINUS
optimisation to a stack adjustment: that is, it fills a
delay slot with a stack adjustment that is only valid on
one edge, then inserts the opposite adjustment on the
other edge.

This is related to PR51471.  We shouldn't do this
adjustment for frame-related instructions.