[Bug rtl-optimization/110390] New: ICE on valid code on x86_64-linux-gnu with sel-scheduling: in av_set_could_be_blocked_by_bookkeeping_p, at sel-sched.cc:3609

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110390

            Bug ID: 110390
           Summary: ICE on valid code on x86_64-linux-gnu with
                    sel-scheduling: in
                    av_set_could_be_blocked_by_bookkeeping_p, at
                    sel-sched.cc:3609
           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/Gd15nnhrv

[571] % 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)
[572] %
[572] % gcctk -O2 -fno-tree-dce -fsel-sched-pipelining -fno-dce -fno-tree-ter
-fno-gcse -fno-ssa-phiopt -fno-tree-dse -fno-if-conversion -fno-thread-jumps
-fselective-scheduling2 -fno-guess-branch-probability small.c
during RTL pass: sched2
small.c: In function ‘main’:
small.c:23:1: internal compiler error: in
av_set_could_be_blocked_by_bookkeeping_p, at sel-sched.cc:3609
   23 | }
      | ^
0x7d6356 av_set_could_be_blocked_by_bookkeeping_p
        ../../gcc-trunk/gcc/sel-sched.cc:3609
0x7d6356 code_motion_process_successors
        ../../gcc-trunk/gcc/sel-sched.cc:6386
0x7d6356 code_motion_path_driver
        ../../gcc-trunk/gcc/sel-sched.cc:6608
0xf857a9 code_motion_process_successors
        ../../gcc-trunk/gcc/sel-sched.cc:6342
0xf857a9 code_motion_path_driver
        ../../gcc-trunk/gcc/sel-sched.cc:6608
0xf857a9 code_motion_process_successors
        ../../gcc-trunk/gcc/sel-sched.cc:6342
0xf857a9 code_motion_path_driver
        ../../gcc-trunk/gcc/sel-sched.cc:6608
0xf86858 find_used_regs
        ../../gcc-trunk/gcc/sel-sched.cc:3272
0xf86858 collect_unavailable_regs_from_bnds
        ../../gcc-trunk/gcc/sel-sched.cc:1586
0xf86858 find_best_reg_for_expr
        ../../gcc-trunk/gcc/sel-sched.cc:1649
0xf893ac fill_vec_av_set
        ../../gcc-trunk/gcc/sel-sched.cc:3784
0xf893ac fill_ready_list
        ../../gcc-trunk/gcc/sel-sched.cc:4014
0xf893ac find_best_expr
        ../../gcc-trunk/gcc/sel-sched.cc:4374
0xf893ac fill_insns
        ../../gcc-trunk/gcc/sel-sched.cc:5535
0xf893ac schedule_on_fences
        ../../gcc-trunk/gcc/sel-sched.cc:7353
0xf893ac 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
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.
[573] %
[573] % cat small.c
int a, b, c, d, e, f;
extern void k();
int main() {
  int h = 6, i;
j:
  if (b)
    h = 0;
  if (c) {
    k();
    goto l;
  }
  int m = i = 0;
  for (; i < 2; i++)
    ;
  long n = a;
l:
  d = ~m || n ^ (a & f);
  m = f;
  f = ~(n && h | e) && a;
  if (h && a)
    goto j;
  return 0;
}