[Bug tree-optimization/35043] New: ICE in tree-data-ref because signed_type_for_types returns NULL

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

1510      type = signed_type_for_types (TREE_TYPE (chrec_a), TREE_TYPE
(chrec_b));
1511      chrec_a = chrec_convert (type, chrec_a, NULL_TREE);

(gdb) p type
$4 = (tree) 0x0

and we then ICE in

#0  0x000000000064bc08 in fold_convert (type=0x0, arg=0x2aad7d1bb570)
    at /space/rguenther/src/svn/trunk/gcc/fold-const.c:2496

(gdb) call debug_tree (chrec_a)
 <integer_cst 0x2aad7d1bb570 type <integer_type 0x2aad7d1ae0c0 bit_size_type>
constant invariant 1>
(gdb) call debug_tree (chrec_b)
 <integer_cst 0x2aad7d1bb390 type <integer_type 0x2aad7d1ae0c0 bit_size_type>
constant invariant 0>


-- 
           Summary: ICE in tree-data-ref because signed_type_for_types
                    returns NULL
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
GCC target triplet: ia64-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35043