[Bug rtl-optimization/59743] New: [4.9 Regression] ICE: Segmentation fault

[trippels at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59743

            Bug ID: 59743
           Summary: [4.9 Regression] ICE: Segmentation fault
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org

reduced test case:

typedef union {
  long all;
  struct {
    int low;
    int high;
  } s;
} udwords;
int a, b, c, d;
void __udivmoddi4() {
  udwords r;
  d = __builtin_clz(0);
  r.s.low = 0;
  for (; d; --d) {
    r.s.high = r.s.high << 1 | r.s.low >> a;
    r.s.low = r.s.low << b >> 1;
    int s = -r.all;
    c = s;
    r.all--;
  }
}

 % g++ -O2 -c test.ii
test.ii: In function ‘void __udivmoddi4()’:
test.ii:20:1: internal compiler error: Segmentation fault
 }
 ^
0xb4f8df crash_signal
        ../../gcc/gcc/toplev.c:337
0xb056c9 reg_used_between_p(rtx_def const*, rtx_def const*, rtx_def const*)
        ../../gcc/gcc/rtlanal.c:753
0x103e6eb combine_reaching_defs
        ../../gcc/gcc/ree.c:734
0x103e6eb find_and_remove_re
        ../../gcc/gcc/ree.c:973
0x103e6eb rest_of_handle_ree
        ../../gcc/gcc/ree.c:1035
0x103e6eb execute
        ../../gcc/gcc/ree.c:1074
Please submit a full bug report,