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 ADC9E3858028; Wed,  7 Apr 2021 14:58:49 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org ADC9E3858028
From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/99959] New: missing -Wuninitialized for an esra
 variable with TREE_NO_WARNING
Date: Wed, 07 Apr 2021 14:58:49 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: msebor at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-99959-4@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: Wed, 07 Apr 2021 14:58:49 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99959

            Bug ID: 99959
           Summary: missing -Wuninitialized for an esra variable with
                    TREE_NO_WARNING
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: msebor at gcc dot gnu.org
  Target Milestone: ---

GCC fails to issue -Wuninitialized for the following test case derived from
pr99945.  The warning detects the uninitialized use but the SR.3 variable h=
as
the TREE_NO_WARNING bit set which suppresses it.

$ cat z.c && gcc -O2 -S -Wall -fdump-tree-esra=3D/dev/stdout z.c
void g (void)
{
  int i;

  void f (int *t)
  {
    __builtin_printf ("%i", i);   // missing -Wuninitialized
  }

  int t __attribute__ ((cleanup (f))) =3D 0;
}


;; Function f (f.0, funcdef_no=3D1, decl_uid=3D1947, cgraph_uid=3D1, symbol=
_order=3D0)

void f (int * t)
{
  int _3;

  <bb 2> :
  _3 =3D CHAIN.1_2(D)->i;
  __builtin_printf ("%i", _3);
  return;

}



;; Function g (g, funcdef_no=3D0, decl_uid=3D1943, cgraph_uid=3D2, symbol_o=
rder=3D1)

Created a replacement for FRAME.0 offset: 0, size: 32: SR.3D.1962
void g ()
{
  int SR.3;
  struct FRAME.g FRAME.0;
  int t;
  void * _3;
  int _8;

  <bb 2> :
  _3 =3D __builtin_dwarf_cfa (0);
  FRAME.0.FRAME_BASE.PARENT =3D _3;
  _8 =3D SR.3_10(D);
  __builtin_printf ("%i", _8);
  return;

}=