[Bug c++/98331] New: [9/10/11 Regression] ICE in haifa_luid_for_non_insn, at haifa-sched.c:7845

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98331

            Bug ID: 98331
           Summary: [9/10/11 Regression] ICE in haifa_luid_for_non_insn,
                    at haifa-sched.c:7845
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Following combination of options affects several files from
gcc/testsuite at -O2+, e.g. pr69589_0.C, builtin_unreachable-1.c,
devirt-52.C, ... (regression date depends on testfile) :


$ g++-11-20201213 -c pr69589_0.C -g -O2 -m32 -fopenmp -fprofile-generate
pr69589_0.C: In member function 'Z<S, B<S> > C<int>::m8() const':
pr69589_0.C:22:1: warning: no return statement in function returning non-void
[-Wreturn-type]
   22 | }
      | ^
during RTL pass: sched2
pr69589_0.C:22:1: internal compiler error: in haifa_luid_for_non_insn, at
haifa-sched.c:7845
0x1556e06 haifa_luid_for_non_insn
        ../../gcc/haifa-sched.c:7845
0x155d809 sched_init_insn_luid(rtx_insn*)
        ../../gcc/haifa-sched.c:8977
0x155de2a sched_init_luids(vec<basic_block_def*, va_heap, vl_ptr>)
        ../../gcc/haifa-sched.c:9006
0x155e0dc haifa_sched_init()
        ../../gcc/haifa-sched.c:7382
0xc46d1a schedule_insns()
        ../../gcc/sched-rgn.c:3514
0xc473fd schedule_insns()
        ../../gcc/sched-rgn.c:3508
0xc473fd rest_of_handle_sched2
        ../../gcc/sched-rgn.c:3746
0xc473fd execute
        ../../gcc/sched-rgn.c:3882

---

pr69589_0.C: In member function 'Z<S, B<S> > C<int>::m8() const':
pr69589_0.C:22:1: warning: no return statement in function returning non-void
[-Wreturn-type]
   22 | }
      | ^
during RTL pass: expand
pr69589_0.C:22:1: internal compiler error: Segmentation fault
0xf86f4f crash_signal
        ../../gcc/toplev.c:327
0xaa7913 rtl_verify_bb_pointers
        ../../gcc/cfgrtl.c:2780
0xaa7913 rtl_verify_flow_info_1
        ../../gcc/cfgrtl.c:2832
0xaa84b2 rtl_verify_flow_info
        ../../gcc/cfgrtl.c:3076
0xa8879a verify_flow_info()
        ../../gcc/cfghooks.c:267
0x19920e6 checking_verify_flow_info
        ../../gcc/cfghooks.h:212
0x19920e6 try_optimize_cfg
        ../../gcc/cfgcleanup.c:3009
0x1992513 cleanup_cfg(int)
        ../../gcc/cfgcleanup.c:3174
0xa85841 execute
        ../../gcc/cfgexpand.c:6884