[Bug c++/108792] New: [10/11/12/13 Regression] ICE in reset_sched_cycles_in_current_ebb, at sel-sched.cc:7147

["gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108792

            Bug ID: 108792
           Summary: [10/11/12/13 Regression] ICE in
                    reset_sched_cycles_in_current_ebb, at
                    sel-sched.cc:7147
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Started with r10 between 20191110 and 20191117 (one week before pr97972),
at -O2+ and with special option -march=amdfam10 :

Testcase was derived from
llvm-project-llvmorg-14.0.6/openmp/libomptarget/test/mapping/declare_mapper_nested_default_mappers_complex_structure.cpp


$ cat z1.cc
class A {
public:
  A() {
    a = 1;
    b = 2;
  }
  void show() {
    __builtin_printf ("\n");
    __builtin_printf ("%d %d\n", a, b);
  }
  int a;
  int b;
};
class B {
public:
  B() {
    arr = new A[2];
    len = 2;
  }
  void show() {
    for (int i = 0; i < len; i++)
      arr[i].show();
  }
  A *arr;
  int len;
};
void foo (void) {
  B *x = new B[2];
  for (int i = 0; i < 2; i++)
    x[i].show();
  return;
}


$ gcc-13-20230212 -c z1.cc -O2 -fnon-call-exceptions -fprofile-generate
-fsel-sched-pipelining -fselective-scheduling2
$
$ gcc-13-20230212 -c z1.cc -O2 -fnon-call-exceptions -fprofile-generate
-fsel-sched-pipelining -fselective-scheduling2 -march=amdfam10
during RTL pass: sched2
z1.cc: In member function 'void B::show()':
z1.cc:23:3: internal compiler error: in reset_sched_cycles_in_current_ebb, at
sel-sched.cc:7147
   23 |   }
      |   ^
0x11f60c5 reset_sched_cycles_in_current_ebb
        ../../gcc/sel-sched.cc:7147
0x11f60c5 sel_region_target_finish
        ../../gcc/sel-sched.cc:7220
0x11f60c5 sel_region_finish
        ../../gcc/sel-sched.cc:7276
0x11f60c5 sel_sched_region(int)
        ../../gcc/sel-sched.cc:7645
0x11f62f9 run_selective_scheduling()
        ../../gcc/sel-sched.cc:7720
0x11d2475 rest_of_handle_sched2
        ../../gcc/sched-rgn.cc:3743
0x11d2475 execute
        ../../gcc/sched-rgn.cc:3890