[Bug tree-optimization/79977] New: [7 Regression] [graphite] ICE in outermost_loop_in_sese, at sese.c:300 w/ -O2 -floop-nest-optimize

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79977

            Bug ID: 79977
           Summary: [7 Regression] [graphite] ICE in
                    outermost_loop_in_sese, at sese.c:300 w/ -O2
                    -floop-nest-optimize
           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-alpha2017030 snapshot ICEs when compiling the following snippet w/
-O2 -floop-nest-optimize:

int uo[3];
int di;

void
i7 (int mp)
{
  int l4;

 wh:
  while (l4 > 1)
    {
      for (di = 0; di < 2; ++di)
        uo[di] = 0;

      for (di = 0; di < 3; ++di)
        {
          uo[di] = 0;
          if (mp != 0)
            goto wh;
        }

      --l4;
    }
}

% gcc-7.0.0-alpha20170305 -O2 -floop-nest-optimize -c wllzygh3.c
wllzygh3.c: In function 'i7':
wllzygh3.c:5:1: internal compiler error: in outermost_loop_in_sese, at
sese.c:300
 i7 (int mp)
 ^~