The following C++ code currently fails at -O2 -fnon-call-exceptions:
extern "C" void abort ();
int a[3];
int f ()
{
  int sum = 0;
  try
  {
    for (int i = 0; i < 3; ++i)
      sum += a[i];
  }
  catch (...)
  {
    abort ();
  }
  return sum;
}

I think someone forgets to cleanup the eh regions after unrolling:
t.cc: In function ‘int f()’:
t.cc:2: error: BB 0 last statement has incorrectly set region
t.cc:2: internal compiler error: verify_flow_info failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

-- 
           Summary: [4.1 Regression] ICE after cunrolling
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org,rakdver at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23626