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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/106776] Unexpected use-after-free warning
Date: Sat, 22 Oct 2022 01:08:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106776

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Before PRE
=20
[/opt/compiler-explorer/gcc-12.2.0/include/c++/12.2.0/bits/stl_tree.h:1061:=
28]
__position =3D{v} {CLOBBER(eol)};
  [/app/example.cpp:25:62] _4 =3D [/app/example.cpp:25:10]
&[/app/example.cpp:25:62] [/app/example.cpp:25:62] MEM[(struct pair *)SR.16=
3_98
+ 32B].second;
  [/app/example.cpp:14:23] _57 =3D MEM[(int *)_3];
  [/app/example.cpp:14:21] _58 =3D _57 + -1;
  [/app/example.cpp:14:30] MEM[(int *)_3] =3D _58;
  [/app/example.cpp:14:17] if (_58 =3D=3D 0)
    goto <bb 9>; [33.00%]
  else
    goto <bb 10>; [67.00%]

  <bb 9> [local count: 335388518]:
  MEM[(int *)_3] =3D{v} {CLOBBER};
  [/app/example.cpp:14:45] operator delete (_3, 4);

  <bb 10> [local count: 1016328849]:
  [/opt/compiler-explorer/gcc-12.2.0/include/c++/12.2.0/bits/stl_pair.h:185=
:12]
D.26938 =3D{v} {CLOBBER};
  [/app/example.cpp:25:37] D.26938 =3D{v} {CLOBBER(eol)};
  [/app/example.cpp:14:23] _54 =3D MEM[(int *)_3];

So it is not PRE causing the issue ... Look further back.=