[Bug tree-optimization/79409] New: [7 Regression] [graphite] ICE in outermost_loop_in_sese, at sese.c:300 w/ -fgraphite-identity -ftree-loop-distribution -O1 (or above)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79409

            Bug ID: 79409
           Summary: [7 Regression] [graphite] ICE in
                    outermost_loop_in_sese, at sese.c:300 w/
                    -fgraphite-identity -ftree-loop-distribution -O1 (or
                    above)
           Product: gcc
           Version: 7.0
            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-7.0.0-alpha20170205 snapshot ICEs when compiling the following snippet w/
-O1 (-O2, -O3, -Ofast) -fgraphite-identity -ftree-loop-distribution:

struct
{
  int bz;
} od, ka[2];
int fw;

void
pc (void)
{
  for (od.bz = 0; od.bz < 2; ++od.bz)
    {
      ++fw;
      ka[0] = ka[1];
    }
}

% gcc-7.0.0-alpha20170205 -O1 -fgraphite-identity -ftree-loop-distribution -c
ady9pcky.c
ady9pcky.c: In function 'pc':
ady9pcky.c:8:1: internal compiler error: in outermost_loop_in_sese, at
sese.c:300
 pc (void)
 ^~