[Bug c/82849] New: [8 Regression] ICE on valid code since r254379

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82849

            Bug ID: 82849
           Summary: [8 Regression] ICE on valid code since r254379
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org
  Target Milestone: ---

We divide by zero here:

  1425        if (single_exit (loop)->count () > profile_count::zero ())
  1426          trip_count = latch_edge->count ().to_gcov_type ()
  1427                       / single_exit (loop)->count ().to_gcov_type ();

$ ./xgcc -B.
/home/marxin/Programming/gcc/gcc/testsuite/gfortran.dg/eoshift_5.f90  -O2
-fmodulo-sched
during RTL pass: sms
/home/marxin/Programming/gcc/gcc/testsuite/gfortran.dg/eoshift_5.f90:182:0:

 end program main

internal compiler error: Floating point exception
0xc0fd1f crash_signal
        ../../gcc/toplev.c:324
0x143b536 sms_schedule
        ../../gcc/modulo-sched.c:1426
0x143cd6f execute
        ../../gcc/modulo-sched.c:3342