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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104543] [12 Regression] wrong code at -O3 on
 x86_64-linux-gnu
Date: Tue, 15 Feb 2022 07:14:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104543

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-02-15
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
>>From what I could tell it is the unroll and jam pass which is messing up.


-fno-loop-unroll-and-jam

  <bb 5> [local count: 542102826]:
  # c.4_21 =3D PHI <0(7), _9(23)>
  _7 =3D a[c.4_21];
  _8 =3D _7 ^ 1;
  a[c.4_21] =3D _8;
  _9 =3D c.4_21 + 1;
  _11 =3D b_lsm.13_13 + 1;
  if (_11 <=3D 2)
    goto <bb 22>; [83.33%]
  else
    goto <bb 8>; [16.67%]

  <bb 22> [local count: 451752355]:
  a[c.4_21] =3D _7;=