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 5296638618F9; Fri,  6 Nov 2020 16:09:26 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5296638618F9
From: "amacleod at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: =?UTF-8?B?W0J1ZyB0cmVlLW9wdGltaXphdGlvbi85NzczN10gWzExIFJlZ3Jl?=
 =?UTF-8?B?c3Npb25dIElDRSBhdCAtT3MgYW5kIGFib3ZlOiB0cmVlIGNoZWNrOiBleHBl?=
 =?UTF-8?B?Y3RlZCBjbGFzcyDigJh0eXBl4oCZLCBoYXZlIOKAmGV4Y2VwdGlvbmFs4oCZ?=
 =?UTF-8?B?IChlcnJvcl9tYXJrKSBpbiB1c2VsZXNzX3R5cGVfY29udmVyc2lvbl9wLCBh?=
 =?UTF-8?B?dCBnaW1wbGUtZXhwci5jOjg4?=
Date: Fri, 06 Nov 2020 16:09:26 +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: 11.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: amacleod at redhat dot com
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: DUPLICATE
X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 11.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_status resolution
Message-ID: <bug-97737-4-jsI1JCosta@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-97737-4@http.gcc.gnu.org/bugzilla/>
References: <bug-97737-4@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: Fri, 06 Nov 2020 16:09:26 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97737

Andrew Macleod <amacleod at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #3 from Andrew Macleod <amacleod at redhat dot com> ---
This is actually the same issue as 97741.  The iL is being changed and we l=
ose
info.  The first thing visited is:

e_4 =3D PHI <1(2), e_3(7)>

and the incoming edge from bb7 is determined to be undefined, so we fold e_=
4 to
1
but later on the undefined edge becomes defined due a "harmless" constant in
unreachable code being propagated.

The end result is now:

<bb 2> :
  b =3D 1;
  a.0_1 =3D a;
  e_10 =3D 1 / a.0_1;
  if (e_10 =3D=3D 0)
    goto <bb 3>; [INV]
  else
    goto <bb 4>; [INV]

  <bb 3> :
  c.1_2 =3D c;

  <bb 4> :
  return;

*** This bug has been marked as a duplicate of bug 97741 ***=