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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/111432] New: `bool & (a|1)` is not optimized
 to just `bool`
Date: Sat, 16 Sep 2023 04:11:36 +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: 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=3D111432

            Bug ID: 111432
           Summary: `bool & (a|1)` is not optimized to just `bool`
           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
foo3(int c, int bb)
{
  if ((bb & ~3)!=3D0) __builtin_unreachable();
  return (bb & (c|3));
}
int
foo_bool(int c, _Bool bb)
{
  return (bb & (c|7));
}
```
foo3 should be optimized to just `return bb`, likewise for foo_bool.

Note LLVM does this.=