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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/103562] Jitted code produces incorrect result when
 returning 3-member struct from internal function
Date: Mon, 06 Dec 2021 22:13:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103562

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #1)
> So there's fishy the [return slot optimization].
RSO should be fine there, that is what you get even with the C code version
from GCC (-O2 -fno-inline):

;; Function deref (deref, funcdef_no=3D0, decl_uid=3D1982, cgraph_uid=3D1,
symbol_order=3D0)

struct my_struct deref (struct my_struct * ptr)
{
  <bb 2> [local count: 1073741824]:
  <retval> =3D *ptr_2(D);
  return <retval>;

}

;; Function get_a (get_a, funcdef_no=3D1, decl_uid=3D1985, cgraph_uid=3D2,
symbol_order=3D1)

long int get_a (struct my_struct * s)
{
  struct my_struct D.1993;
  long int _4;

  <bb 2> [local count: 1073741824]:
  D.1993 =3D deref (s_2(D)); [return slot optimization]
  _4 =3D D.1993.a;
  return _4;

}=