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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/111542] New: [11/12/13/14 Regression]
Date: Fri, 22 Sep 2023 18:51:13 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111542

            Bug ID: 111542
           Summary: [11/12/13/14 Regression]
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
_Bool f(int x,int y)
{
  _Bool a =3D x =3D=3D 0;
  _Bool b =3D y =3D=3D 0;
  _Bool t =3D a & b;
  return t & !a;
}

```

This used to optimize to 0 in GCC 6 but starting with GCC 7, we get:
```
  _5 =3D x_2(D) | y_3(D);
  _6 =3D _5 =3D=3D 0;
  _1 =3D x_2(D) !=3D 0;
  _7 =3D _1 & _6;
```=