[Bug tree-optimization/54098] [4.8 Regression] ICE on valid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54098

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-07-26
   Target Milestone|---                         |4.8.0
            Summary|[tree-vrp] ICE on valid     |[4.8 Regression] ICE on
                   |code                        |valid code
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-26 
09:00:10 UTC ---
Confirmed, mine.

Program received signal SIGSEGV, Segmentation fault.
0x0000000000e03ca0 in compare_values_warnv (val1=0x0, val2=0x7ffff70bef00, 
    strict_overflow_p=0x7fffffffd83b "")
    at /space/rguenther/src/svn/trunk/gcc/tree-vrp.c:1148
1148      gcc_assert (POINTER_TYPE_P (TREE_TYPE (val1))
(gdb) p val1
$1 = (tree) 0x0

lhs_vr is undefined in vrp_visit_phi_node at

7671      if (edges > 0
7672          && gimple_phi_num_args (phi) > 1
7673          && edges == old_edges)
7674        {
7675          int cmp_min = compare_values (lhs_vr->min, vr_result.min);
7676          int cmp_max = compare_values (lhs_vr->max, vr_result.max);