[Bug tree-optimization/82421] New: [8 Regression] [graphite] ICE: tree check: expected ssa_name, have integer_cst in get_rename, at graphite-isl-ast-to-gimple.c:1127

["asolokha at gmx dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82421

            Bug ID: 82421
           Summary: [8 Regression] [graphite] ICE: tree check: expected
                    ssa_name, have integer_cst in get_rename, at
                    graphite-isl-ast-to-gimple.c:1127
           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-alpha20171001 snapshot (r253330) ICEs when compiling the following
snippet w/ -O1 -floop-nest-optimize:

int pc;

void
qy (int l9)
{
  int tw = 4;
  int fb[tw];

  while (l9 < 1)
    {
      int dr;

      pc = fb[2];
      for (dr = 0; dr < tw; ++dr)
        fb[dr] = 0;
      ++l9;
    }
}

% gcc-8.0.0-alpha20171001 -O1 -floop-nest-optimize -c gqnwitc4.c
during GIMPLE pass: graphite
gqnwitc4.c: In function 'qy':
gqnwitc4.c:4:1: internal compiler error: tree check: expected ssa_name, have
integer_cst in get_rename, at graphite-isl-ast-to-gimple.c:1127
 qy (int l9)
 ^~