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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/109691] New: Takes until forwprop2 to remove
 !a sometimes
Date: Tue, 02 May 2023 05:06:03 +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: internal-improvement, 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=3D109691

            Bug ID: 109691
           Summary: Takes until forwprop2 to remove !a sometimes
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: internal-improvement, 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:
```
int f(_Bool c, int a, int b)
{
        _Bool d =3D c;
        d =3D !d;
        if (d !=3D 0) return a;
        return b;
}
```

It takes until forwprop2 now to remove all of the code before the condition=
al.
In GCC 4.9.0, we used to do it almost all the way in forwprop1; with just o=
ne
assignment added.

I noticed this while looking into PR 67628 but it is not exactly an issue t=
here
so filing it seperately.=