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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/99641] [11 Regression] opt30.adb, opt49.adb and
 loop_optimization3.adb fail to build at m32
Date: Thu, 18 Mar 2021 10:32:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99641

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|ada                         |middle-end
   Target Milestone|---                         |11.0
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |ebotcazou at gcc do=
t gnu.org

--- Comment #2 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
The offset calculation in native_encode_initializer is incorrect:

              if (index && TREE_CODE (index) =3D=3D RANGE_EXPR)
                {
                  if (!tree_fits_shwi_p (TREE_OPERAND (index, 0))
                      || !tree_fits_shwi_p (TREE_OPERAND (index, 1)))
                    return 0;
                  pos =3D (tree_to_shwi (TREE_OPERAND (index, 0)) - min_ind=
ex)
                        * fieldsize;
                  count =3D (tree_to_shwi (TREE_OPERAND (index, 1))
                           - tree_to_shwi (TREE_OPERAND (index, 0)));
                }
              else if (index)
                {
                  if (!tree_fits_shwi_p (index))
                    return 0;
                  pos =3D (tree_to_shwi (index) - min_index) * fieldsize;
                }

It must not be done in HOST_WIDE_INT but in sizetype instead, like in e.g.
get_inner_reference or get_ref_base_and_extent.=