[Bug rtl-optimization/83530] New: [8 Regression] ICE in reset_sched_cycles_in_current_ebb, at sel-sched.c:7150

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83530

            Bug ID: 83530
           Summary: [8 Regression] ICE in
                    reset_sched_cycles_in_current_ebb, at sel-sched.c:7150
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-*-linux-gnu

gcc-8.0.0-alpha20171217 snapshot (r255766) ICEs when compiling the following
snippet w/ -O2 -fmodulo-sched -fselective-scheduling2 for 32-bit BE powerpc:

int vm, z0;
short int mz;

int
ny (void)
{
  int ch;

  for (ch = 0; ch < 6; ++ch)
    vm += ch / vm;

  return z0 + mz;
}

% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20171217 -O2 -fmodulo-sched
-fselective-scheduling2 -c l2lvoqjz.c                                           
during RTL pass: sched2
l2lvoqjz.c: In function 'ny':
l2lvoqjz.c:13:1: internal compiler error: in reset_sched_cycles_in_current_ebb,
at sel-sched.c:7150
 }
 ^
0xbeef28 reset_sched_cycles_in_current_ebb
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/sel-sched.c:7150
0xbeef28 sel_region_target_finish
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/sel-sched.c:7223
0xbeef28 sel_region_finish
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/sel-sched.c:7279
0xbeef28 sel_sched_region(int)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/sel-sched.c:7642
0xbef151 run_selective_scheduling()
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/sel-sched.c:7713
0xbc615d rest_of_handle_sched2
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/sched-rgn.c:3729
0xbc615d execute
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/sched-rgn.c:3873