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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109138] wrong code at -O1 and above on
 x86_64-linux-gnu
Date: Wed, 15 Mar 2023 06:07:38 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109138

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2023-03-15
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
reassoc1 introduces the unconditional use of an unitialized variable.

From:
  <bb 3> [local count: 1014686025]:
  if (d_5(D) !=3D 0)
    goto <bb 5>; [5.50%]
  else
    goto <bb 4>; [94.50%]

  <bb 4> [local count: 1073741824]:
  a.1_1 =3D a;
  if (a.1_1 =3D=3D 0)
    goto <bb 3>; [94.50%]
  else
    goto <bb 5>; [5.50%]

To:

  a.1_1 =3D a;
  _12 =3D (unsigned int) d_5(D);
  _4 =3D _12 | a.1_1;
  _3 =3D _4 =3D=3D 0;
  if (_3 !=3D 0)
    goto <bb 3>; [94.50%]
  else
    goto <bb 4>; [5.50%]=