[Bug rtl-optimization/84842] New: ICE in verify_target_availability, at sel-sched.c:1569

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84842

            Bug ID: 84842
           Summary: ICE in verify_target_availability, at sel-sched.c:1569
           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-alpha20180311 snapshot (r258438) ICEs when compiling the following
snippet w/ -mcpu=power8 -O1 -frename-registers -fschedule-insns2
-fselective-scheduling2 -ftrapv:

int ad;
double cm;

void
tn (int on, int zt, int rc)
{
  if (cm != 0.0)
    {
      while ((on + cm * ad * 2 / zt) < 1)
        zt = -rc;

      ad = cm / 2 + rc;
      ad = -on - ad;
    }
}

% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180311 -mcpu=power8 -O1
-frename-registers -fschedule-insns2 -fselective-scheduling2 -ftrapv -c
vvk0ahws.c
during RTL pass: sched2
vvk0ahws.c: In function 'tn':
vvk0ahws.c:15:1: internal compiler error: in verify_target_availability, at
sel-sched.c:1569
 }
 ^
0xc13856 verify_target_availability
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:1566
0xc13856 find_best_reg_for_expr
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:1679
0xc13856 fill_vec_av_set
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:3797
0xc13fd0 fill_ready_list
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:4027
0xc13fd0 find_best_expr
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:4387
0xc13fd0 fill_insns
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:5544
0xc163ee schedule_on_fences
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7361
0xc163ee sel_sched_region_2
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7499
0xc18bf1 sel_sched_region_1
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7541
0xc18bf1 sel_sched_region(int)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7642
0xc192c1 run_selective_scheduling()
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7718
0xbf012d rest_of_handle_sched2
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:3729
0xbf012d execute
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:3873