From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id E57E1385742A; Tue,  5 Jul 2022 09:15:43 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E57E1385742A
From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/106157] [13 Regression] ICE verify_ssa failed
 since r13-1268-g8c99e307b20c502e
Date: Tue, 05 Jul 2022 09:15:43 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: aldyh at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 13.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-106157-4-Vz6bp1yzVQ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-106157-4@http.gcc.gnu.org/bugzilla/>
References: <bug-106157-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 05 Jul 2022 09:15:44 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106157

--- Comment #1 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Silly question...

In the lto1 that ICEs, we have the following in
a.ltrans0.ltrans.094t.fixup_cfg3 (i.e. before DOM even comes into the pictu=
re):

  // Local variable
  struct VideoFrame videoFrame;
...
...
...
  <bb 2> [local count: 1073741824]:
  _5 =3D MEM[(struct VideoThumbnailer *)this_1(D)].m_MaintainAspectRatio;
  _6 =3D (int) _5;
  _7 =3D MEM[(struct VideoThumbnailer *)this_1(D)].m_ThumbnailSize;
  _12 =3D &MEM[(struct VideoFrame &)&videoFrame].frameData;
  __pos_13 =3D MEM[(struct vector *)&videoFrame + 8B].D.4741._M_impl._M_sta=
rt;
  _14 =3D MEM[(struct vector *)&videoFrame + 8B].D.4741._M_impl._M_finish;
  if (__pos_13 !=3D _14)
    goto <bb 3>; [70.00%]
  else
    goto <bb 4>; [30.00%]

Aren't we reading from videoFrame before it's set?=