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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/99308] [OOP] passing array of object as class(TYPE) to
 procedure  leads to incorrect length of array
Date: Mon, 01 Mar 2021 11:28:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99308

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
                 CC|                            |burnus at gcc dot gnu.org

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> ---
I think there are two errors:

(a) The value can be simplified at compile time as the size (8 or 2) is kno=
wn
at compile time, but isn't.

I wonder whether this only a problem for 'size' or also for 'ubound','lboun=
d'
or when doing
  var(:)%idx =3D 0  =E2=80=93 for the bounds of the generated do loop.


(b) The run-time version is wrong.

In my dump, (and output '2 2') I see for either variable

      parm.10.span =3D spcs->_vptr->_size;
      parm.10.dtype =3D {.elem_len=3D4, .rank=3D1, .type=3D5};
      D.3995 =3D stride.5;
      parm.10.dim[0].lbound =3D 1;
      parm.10.dim[0].ubound =3D 2;
      parm.10.dim[0].stride =3D NON_LVALUE_EXPR <D.3995>;
      parm.10.data =3D 0B;
      parm.10.offset =3D -NON_LVALUE_EXPR <D.3995>;
      D.3996 =3D &parm.10;
      D.3997 =3D (integer(kind=3D4)) MAX_EXPR <(D.3996->dim[0].ubound -
D.3996->dim[0].lbound) + 1, 0>;


Obviously, 'ubound =3D 2' is only valid for 'fuel' and not for 'spcs'.=