[Bug rtl-optimization/106303] New: ICE on valid code at -O3 with -fno-inline-small-functions on x86_64-linux-gnu: in extract_insn, at recog.cc:2791

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106303

            Bug ID: 106303
           Summary: ICE on valid code at -O3 with
                    -fno-inline-small-functions on x86_64-linux-gnu: in
                    extract_insn, at recog.cc:2791
           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: ---

[557] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-sanitizers
--enable-languages=c,c++ --disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20220714 (experimental) [master r13-1696-g29f40a8047f] (GCC)
[558] %
[558] % gcctk -O3 -fno-inline-small-functions small.c
small.c: In function ‘k’:
small.c:17:1: error: unrecognizable insn:
   17 | }
      | ^
(insn 55 58 66 7 (set (reg:V1TI 90 [ D.2002 ])
        (mem/c:TI (symbol_ref:DI ("j") [flags 0x2] <var_decl 0x7ff1682b7c60 j>)
[2 j+0 S16 A128])) -1
     (nil))
during RTL pass: subreg3
small.c:17:1: internal compiler error: in extract_insn, at recog.cc:2791
0x722c42 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc-trunk/gcc/rtl-error.cc:108
0x722c5e _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc-trunk/gcc/rtl-error.cc:116
0x721191 extract_insn(rtx_insn*)
        ../../gcc-trunk/gcc/recog.cc:2791
0x1d4e347 decompose_multiword_subregs
        ../../gcc-trunk/gcc/lower-subreg.cc:1555
0x1d4f1cd execute
        ../../gcc-trunk/gcc/lower-subreg.cc:1820
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.
[559] %
[559] % cat small.c
struct a {
  int b;
  int c;
  int d;
  int e;
} i, j;
int f, g, h;
struct a k() {
  while (f)
    i = j;
  if (g) {
    for (; h; h++)
      i = j;
    return j;
  }
  return i;
}
int main() {
  k();
  return 0;
}