[Bug target/107786] New: [13 Regression] ICE in extract_insn, at recog.cc:2791 since r13-4151-gacbb5ef06ee978

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107786

            Bug ID: 107786
           Summary: [13 Regression] ICE in extract_insn, at recog.cc:2791
                    since r13-4151-gacbb5ef06ee978
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: ptomsich at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: riscv64-unknown-linux-gnu

The following crashes now:

$ cat riscv.c
int c;

int main() {
  for (;;) {
    char h = c * 100;
    if (h)
      break;
  }
}

$ /dev/shm/objdir2/gcc/xgcc -B /dev/shm/objdir2/gcc/ riscv.c -O2 -S
riscv.c: In function ‘main’:
riscv.c:9:1: error: unrecognizable insn:
    9 | }
      | ^
(jump_insn 37 36 15 2 (set (pc)
        (if_then_else (ne (reg:SI 14 a4 [147])
                (const_int 0 [0]))
            (label_ref 18)
            (pc))) "riscv.c":6:8 -1
     (int_list:REG_BR_PROB 355222868 (nil))
 -> 18)
during RTL pass: split2
riscv.c:9:1: internal compiler error: in extract_insn, at recog.cc:2791
0x13ef4be _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/marxin/Programming/gcc2/gcc/rtl-error.cc:108
0x13ef4ff _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/marxin/Programming/gcc2/gcc/rtl-error.cc:116
0x139e8a7 extract_insn(rtx_insn*)
        /home/marxin/Programming/gcc2/gcc/recog.cc:2791
0x139e563 extract_insn_cached(rtx_insn*)
        /home/marxin/Programming/gcc2/gcc/recog.cc:2680
0xf3dd44 cleanup_subreg_operands(rtx_insn*)
        /home/marxin/Programming/gcc2/gcc/final.cc:3054
0x139ff38 split_insn
        /home/marxin/Programming/gcc2/gcc/recog.cc:3420
0x13a00b8 split_all_insns()
        /home/marxin/Programming/gcc2/gcc/recog.cc:3488
0x13a2022 execute
        /home/marxin/Programming/gcc2/gcc/recog.cc:4457
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.