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 00D293959C97; Wed, 16 Nov 2022 12:55:43 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 00D293959C97
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1668603344;
	bh=Y5KsKh9y3S278eb7P+6QEi2zJ6QDkhwHF0bMd68zSW4=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=VXtMiFFXA7Nd8If4l/TBmMmp5PdjcvYbtva0yatHVzDxvuMRmFsOQfhEBYc4d4XVy
	 WAPHBTFxBIxfpUL/ZiOFoLvZzpPU4V4n/nwtmnBO6cHZUnLDA2Ar99C8ydILEgdghp
	 LCJotqpfy66dA1Ui9htuh/vjHklULwjruvDr0/5k=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/107679] [13 Regression] ICE in maybe_register_def,
 at tree-into-ssa.cc:1914
Date: Wed, 16 Nov 2022 12:55:43 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 13.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: component assigned_to bug_status priority
Message-ID: <bug-107679-4-PT0StLXgBw@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-107679-4@http.gcc.gnu.org/bugzilla/>
References: <bug-107679-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107679

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|fortran                     |middle-end
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org
             Status|NEW                         |ASSIGNED
           Priority|P4                          |P3

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Kind-of, yes.  Somehow 'z' got marked for renaming, probably because we rem=
oved
a TREE_ADDRESABLE flag.  The SSA rewrite wants to replace

  <bb 2> [local count: 1073741824]:
  z =3D{v} {CLOBBER};
  return;

with an "uninitialized" def, but for PARM_DECLs the default def would be
the actual parameter value.  There's nothing wrong with clobbering 'z'
I think, just the into-ssa code isn't prepared for this - the fix would be
to create an anonymous default def in this case.=