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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/114253] False positive maybe-uninitialized
 with std::optional and ternary
Date: Thu, 07 Mar 2024 03:21:36 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 8.3.0
X-Bugzilla-Keywords: diagnostic, missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P3
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Message-ID: <bug-114253-4-3S6Zk5mnil@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-114253-4@http.gcc.gnu.org/bugzilla/>
References: <bug-114253-4@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114253

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
  <bb 6> [local count: 1073741824]:
  # pid_16 =3D PHI <pid_25(4), pid_24(D)(5)>
  # pid$4_26 =3D PHI <pid$4_10(4), 0(5)>
  kill_pid (0);
  goto <bb 8>; [100.00%]

  <bb 7> [count: 0]:
<L13>:
  goto <bb 15>; [100.00%]

  <bb 8> [local count: 1073741824]:
  _12 =3D VIEW_CONVERT_EXPR<bool>(pid$4_26);
  if (_12 !=3D 0)
    goto <bb 9>; [33.00%]
  else
    goto <bb 16>; [67.00%]

  <bb 9> [local count: 354334800]:
  kill_pid (pid_16);
  goto <bb 11>; [100.00%]

```

Funny if we turn off SRA we get:
```
  <bb 8> [local count: 354334800]:
  _2 =3D MEM[(int &)&pid];
  kill_pid (_2);
  goto <bb 10>; [100.00%]

  <bb 9> [count: 0]:
<L14>:
  goto <bb 14>; [100.00%]

  <bb 10> [local count: 536870912]:
  kill_pid (_2);

  <bb 17> [local count: 536870912]:
  goto <bb 12>; [100.00%]
```

(note bb9/bb17 here looks to be landing pads for EH).=