[Bug rtl-optimization/110393] New: ICE at -O3 with "-fselective-scheduling2 -fPIC": in move_op_ascend, at sel-sched.cc:6150

[zhendong.su at inf dot ethz.ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110393

            Bug ID: 110393
           Summary: ICE at -O3 with "-fselective-scheduling2 -fPIC": in
                    move_op_ascend, at sel-sched.cc:6150
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

It appears to be a regression from 12.*, and affects 13.* and later.

Compiler Explorer: https://godbolt.org/z/Tqsbhv461

[629] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230623 (experimental) [master r14-924-gd709841ae0f] (GCC)
[630] %
[630] % gcctk -O3 -fselective-scheduling2 -fPIC small.c
during RTL pass: sched2
small.c: In function ‘main’:
small.c:40:1: internal compiler error: in move_op_ascend, at sel-sched.cc:6150
   40 | }
      | ^
0x7d606f move_op_ascend
        ../../gcc-trunk/gcc/sel-sched.cc:6150
0x7d606f move_op_ascend
        ../../gcc-trunk/gcc/sel-sched.cc:6142
0xf85287 code_motion_path_driver
        ../../gcc-trunk/gcc/sel-sched.cc:6648
0xf85dd9 move_op
        ../../gcc-trunk/gcc/sel-sched.cc:6702
0xf85dd9 move_exprs_to_boundary
        ../../gcc-trunk/gcc/sel-sched.cc:5223
0xf85dd9 schedule_expr_on_boundary
        ../../gcc-trunk/gcc/sel-sched.cc:5436
0xf8834f fill_insns
        ../../gcc-trunk/gcc/sel-sched.cc:5578
0xf8834f schedule_on_fences
        ../../gcc-trunk/gcc/sel-sched.cc:7353
0xf8834f sel_sched_region_2
        ../../gcc-trunk/gcc/sel-sched.cc:7491
0xf8a568 sel_sched_region_1
        ../../gcc-trunk/gcc/sel-sched.cc:7533
0xf8bb86 sel_sched_region(int)
        ../../gcc-trunk/gcc/sel-sched.cc:7634
0xf8bb86 sel_sched_region(int)
        ../../gcc-trunk/gcc/sel-sched.cc:7619
0xf8bd29 run_selective_scheduling()
        ../../gcc-trunk/gcc/sel-sched.cc:7720
0xf6d42d rest_of_handle_sched2
        ../../gcc-trunk/gcc/sched-rgn.cc:3743
0xf6d42d execute
        ../../gcc-trunk/gcc/sched-rgn.cc:3890
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[631] %
[631] % cat small.c
extern void r();
struct a {
  int b : 21;
  int c : 17;
  volatile int d : 3;
  int e;
} l;
int f, j, m, n, o;
volatile struct a g;
static struct a h, k;
static int i;
int main() {
  int p, u, v;
q:
  if (m) {
    r();
    if (j) {
      k.b = 0;
      goto s;
    }
  }
  h.d;
t:
  u = f * (i || g.b | k.e);
  v = (f || 0) * (l.c - (5000000000 & u));
  if (v) {
    if (k.c)
      goto q;
  s:
    if (u)
      goto w;
  }
  short a = p;
  o = -a * n;
  h.d = 0 > h.d;
  p = o;
  goto t;
w:
  return 0;
}