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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug d/103040] gdc.dg/torture/pr101273.d FAILs
Date: Tue, 02 Nov 2021 10:31:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103040

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, I've tried that through:
struct S { S () : x (0) { impl =3D this; } int x; S *impl; ~S () {} };

S
foo ()
{
  S ret;
  return ret;
}

S
bar ()
{
  return S ();
}

int
main ()
{
  S a =3D foo ();
  S b =3D bar ();
  if (a.impl !=3D &a || b.impl !=3D &b)
    __builtin_abort ();
}
but for C++ we don't miscompile that, though indeed starting with the above
mentioned commit at -O1 ealias info changes:
-ESCAPED =3D &a
-ESCAPED =3D &b
-ESCAPED =3D { ESCAPED NONLOCAL a b }
+ESCAPED =3D { }
-a =3D { ESCAPED NONLOCAL a } same as _1
-b =3D { ESCAPED NONLOCAL b } same as _2
+a =3D { NONLOCAL a } same as _1
+b =3D { NONLOCAL b } same as _2
-_1 =3D { ESCAPED NONLOCAL a }
-_2 =3D { ESCAPED NONLOCAL b }
+_1 =3D { NONLOCAL a }
+_2 =3D { NONLOCAL b }
-ESCAPED, points-to non-local, points-to vars: { D.2419 D.2421 } (escaped)
+ESCAPED, points-to vars: { }
-_1, points-to non-local, points-to escaped, points-to NULL, points-to vars=
: {
D.2419 } (escaped)
-_2, points-to non-local, points-to escaped, points-to NULL, points-to vars=
: {
D.2421 } (escaped)
+_1, points-to non-local, points-to NULL, points-to vars: { D.2419 }
+_2, points-to non-local, points-to NULL, points-to vars: { D.2421 }=