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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/110637] New: (type)(zeroonep !=/== 0) should
 be optimized as (type)zeroonep/zeroonep^1 earlier than vrp
Date: Wed, 12 Jul 2023 07:25:56 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110637

            Bug ID: 110637
           Summary: (type)(zeroonep !=3D/=3D=3D 0) should be optimized as
                    (type)zeroonep/zeroonep^1 earlier than vrp
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
int f(int t)
{
 t &=3D 1;
 return t !=3D 0;
}
```
Currently this only gets optimized at -O2 (due to VRP) to:
  _4 =3D t_1(D) & 1;
  return _4;

Likewise for:
```
int g(int t)
{
 t &=3D 1;
 return t =3D=3D 0;
}
```

This was originally how I was going to solve PR 110539 but when we should
optimize to those gets in the way of other optimizations so I decided to fi=
x PR
110539 a different way.=