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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/88280] missing folding of logical and bitwise
 AND
Date: Thu, 12 Oct 2023 17:16:40 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88280

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Match pattern:
```
(for cmp (eq      ne     )
     bop (bit_ior bit_and)
 (bop:c (cmp @0 integer_zerop) (cmp@2 (bit_and:c @0 @1) integer_zerop))
 @2)
```

testcase that shows the issue (of the swapped order of the ifs)
```
_Bool f0(int a, int b)
{
  if (a =3D=3D 0) return 1;
  return (a & b) =3D=3D 0; // (a=3D=3D0) | ((a &b) =3D=3D 0) -> ((a &b) =3D=
=3D 0)
}

_Bool f0_(int a, int b)
{
  if ((a & b) =3D=3D 0) return 1;
  return a =3D=3D 0; // ((a &b) =3D=3D 0) | (a=3D=3D0)  -> ((a &b) =3D=3D 0)
}

_Bool f1(int a, int b)
{
  if (a !=3D 0)  return  (a & b) !=3D 0;
  return 0; // (a!=3D0) & ((a & b) !=3D 0) -> ((a & b) !=3D 0)
}

_Bool f1_(int a, int b)
{
  if ((a & b) !=3D 0)  return a  !=3D 0;
  return 0; // ((a & b) !=3D 0) & (a!=3D0) -> ((a & b) !=3D 0)
}
```=