[Bug fortran/33636] Rejects valid use of vector subscript in derived type parameter

["fxcoudert at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from fxcoudert at gcc dot gnu dot org  2007-10-10 11:23 -------
The problem is that we try simplification in find_array_section() because the
vector subscript is EXPR_ARRAY, which is not necessarily constant (in this
case, the values in the constructor depend on variable i). So, the check for
constantness needs to call gfc_is_constant_expr(), as in the patch below.

(This was hidden on 64-bit machines because there, expressions "i", "i+1" and
"i-1" have to be converted to integer(8), which means the vector subscript
isn't an EXPR_ARRAY but and EXPR_FUNCTION. Thus, we bailed out of the
simplification business.)



Index: expr.c
===================================================================
--- expr.c      (revision 129054)
+++ expr.c      (working copy)
@@ -1165,7 +1165,7 @@ find_array_section (gfc_expr *expr, gfc_
        {
          gcc_assert (begin);

-         if (begin->expr_type != EXPR_ARRAY)
+         if (begin->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (begin))
            {
              t = FAILURE;
              goto cleanup;


-- 

fxcoudert at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |fxcoudert at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2007-10-03 12:27:28         |2007-10-10 11:23:10
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33636