[Bug rtl-optimization/79985] New: ICE in code_motion_path_driver, at sel-sched.c:6580

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79985

            Bug ID: 79985
           Summary: ICE in code_motion_path_driver, at sel-sched.c:6580
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: ppc64le-linux-gnu

I spotted following ICE on trunk:

$ cat memmove.i
long a;
int b;
void
c ()
{
  __asm("" : "=r"(a) : "0"(c));
  __asm("" : "=r"(b));
}

$ ppc64le-linux-gnu-gcc -fselective-scheduling -O3 -fselective-scheduling
memmove.i -c
memmove.i: In function ‘c’:
memmove.i:8:1: internal compiler error: in code_motion_path_driver, at
sel-sched.c:6580
 }
 ^
0x9ceac0 code_motion_path_driver
        .././../gcc/sel-sched.c:6580
0x9ceeb3 move_op
        .././../gcc/sel-sched.c:6704
0x9ceeb3 move_exprs_to_boundary
        .././../gcc/sel-sched.c:5227
0x9ceeb3 schedule_expr_on_boundary
        .././../gcc/sel-sched.c:5440
0x9d2741 fill_insns
        .././../gcc/sel-sched.c:5582
0x9d2741 schedule_on_fences
        .././../gcc/sel-sched.c:7356
0x9d2741 sel_sched_region_2
        .././../gcc/sel-sched.c:7494
0x9d5319 sel_sched_region_1
        .././../gcc/sel-sched.c:7536
0x9d5319 sel_sched_region(int)
        .././../gcc/sel-sched.c:7637
0x9d5cf9 run_selective_scheduling()
        .././../gcc/sel-sched.c:7713
0x9b58fd rest_of_handle_sched
        .././../gcc/sched-rgn.c:3708
0x9b58fd execute
        .././../gcc/sched-rgn.c:3818