[Bug tree-optimization/69728] New: [6 Regression] internal compiler error: in outer_projection_mupa, at graphite-sese-to-poly.c:1175

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69728

            Bug ID: 69728
           Summary: [6 Regression] internal compiler error: in
                    outer_projection_mupa, at graphite-sese-to-poly.c:1175
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
                CC: spop at gcc dot gnu.org
  Target Milestone: ---

The following testcase ICEs for me on aarch64 with -O3 -floop-interchange.

int a[1];
int b, c, d, e;
void
fn1 ()
{
  d = 9;
  for (; c; c++)
    {
      ++d;
      b = 8;
      for (; b; b--)
        {
          if (d)
            break;
          a[b] = e;
        }
    }
}

mycrash.c:4:1: internal compiler error: in outer_projection_mupa, at
graphite-sese-to-poly.c:1175
 fn1 ()
 ^~~
0x1068f68 outer_projection_mupa
        $SRC/gcc/graphite-sese-to-poly.c:1175
0x1068f68 add_loop_schedule
        $SRC/gcc/graphite-sese-to-poly.c:1223
0x106af92 build_schedule_loop
        $SRC/gcc/graphite-sese-to-poly.c:1263
0x106aeae build_schedule_loop_nest
        $SRC/gcc/graphite-sese-to-poly.c:1319
0x106af71 build_schedule_loop
        $SRC/gcc/graphite-sese-to-poly.c:1257
0x106aeae build_schedule_loop_nest
        $SRC/gcc/graphite-sese-to-poly.c:1319
0x106bd2f build_original_schedule
        $SRC/gcc/graphite-sese-to-poly.c:1337
0x106bd2f build_poly_scop(scop*)
        $SRC/gcc/graphite-sese-to-poly.c:1368
0x105582c graphite_transform_loops()
        $SRC/gcc/graphite.c:319
0x10559a4 graphite_transforms
        $SRC/gcc/graphite.c:356
0x10559a4 execute
        $SRC/gcc/graphite.c:433
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.


This is with ISL 0.15