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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/107887] New: (bool0 > bool1) | bool1 is not
 optimized to bool0 | bool1
Date: Sun, 27 Nov 2022 18:59:44 +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: 13.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
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=3D107887

            Bug ID: 107887
           Summary: (bool0 > bool1) | bool1 is not optimized to bool0 |
                    bool1
           Product: gcc
           Version: 13.0
            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 max(_Bool aa, _Bool bb)
{
  bool t =3D aa > bb;
  return t | bb;
}
```
This should be optimized to just `return aa | bb;`
I accidently found this while working on PR 101805 .

The original testcase which I found it:
```
int ii(_Bool aa, _Bool bb)
{
  int c;
  int a =3D aa;
  int b =3D bb;
  if (a > b)
    c =3D a;
  else
    c =3D b;
  if (c)
    return 100;
  return c;
}
```=