[Bug tree-optimization/83922] New: [8 Regression] ICE: Segmentation fault (in contains_struct_check)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83922

            Bug ID: 83922
           Summary: [8 Regression] ICE: Segmentation fault (in
                    contains_struct_check)
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

gcc-8.0.0-alpha20180114 snapshot (r256677) ICEs when compiling the following
snippet w/ -O1 -ftree-loop-vectorize:

int j4;

void
k1 (int ak)
{
  while (ak < 1)
    {
      int ur;

      for (ur = 0; ur < 2; ++ur)
        {
          ++j4;
          if (j4 != 0)
            j4 = 0;
        }

      ++ak;
    }
}

% gcc-8.0.0-alpha20180114 -O1 -ftree-loop-vectorize -c iagj4cra.c
during GIMPLE pass: vect
iagj4cra.c: In function 'k1':
iagj4cra.c:4:1: internal compiler error: Segmentation fault
 k1 (int ak)
 ^~
0xc9520f crash_signal
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180114/work/gcc-8-20180114/gcc/toplev.c:325
0xef9f4e contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180114/work/gcc-8-20180114/gcc/tree.h:3240
0xef9f4e vect_set_loop_condition_masked
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180114/work/gcc-8-20180114/gcc/tree-vect-loop-manip.c:739
0xefb553 vect_set_loop_condition(loop*, _loop_vec_info*, tree_node*,
tree_node*, tree_node*, bool)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180114/work/gcc-8-20180114/gcc/tree-vect-loop-manip.c:928
0xef1d9d vect_transform_loop(_loop_vec_info*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180114/work/gcc-8-20180114/gcc/tree-vect-loop.c:8891
0xf0e1be vectorize_loops()
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180114/work/gcc-8-20180114/gcc/tree-vectorizer.c:740