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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] [11/12/13/14 Regression]
 (a==0)&(b==0) into `(a|b) == 0` optimization sometimes gets in the way of
 other optimizations
Date: Sat, 23 Sep 2023 20:14:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111542

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note IOR with !=3D 0 has the same issue.
Full testcase:
```
_Bool f_and(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;
}


_Bool f_or(int x,int y)
{
  _Bool a =3D x !=3D 0;
  _Bool b =3D y !=3D 0;
  _Bool t =3D a | b;
  return t | !a;
}
```

Match pattern:
```
(for bitop (bit_ior bit_and)
     cmp1  (eq      ne     )
     cmp2  (ne      eq     )
 (simplify
  (bitop:c
   (cmp1 @1 integer_zerop)
   (cmp2 (bit_ior:c @0 @1) integer_zerop))
  { constant_boolean_node (bitop =3D=3D BIT_IOR_EXPR, type); }))
```=