[Bug tree-optimization/97725] New: ICE at -Os and above: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.c:87

["zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97725

            Bug ID: 97725
           Summary: ICE at -Os and above: tree check: expected class
                    ‘type’, have ‘exceptional’ (error_mark) in
                    useless_type_conversion_p, at gimple-expr.c:87
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

[555] % 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/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20201105 (experimental) [master revision
8f565d255a3:fff11f1136a:35c125cb6ac47fa97aa5ee22f987a38e63adad08] (GCC)
[556] %
[556] % gcctk -O1 -c small.c
[557] %
[557] % gcctk -Os -c small.c
during GIMPLE pass: evrp
small.c: In function ‘main’:
small.c:25:1: internal compiler error: tree check: expected class ‘type’, have
‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.c:87
   25 | }
      | ^
0x5fdbc9 tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        ../../gcc-trunk/gcc/tree.c:9802
0x9bb5c3 tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        ../../gcc-trunk/gcc/tree.h:3436
0x9bb5c3 useless_type_conversion_p(tree_node*, tree_node*)
        ../../gcc-trunk/gcc/gimple-expr.c:87
0xd514f0 verify_gimple_phi
        ../../gcc-trunk/gcc/tree-cfg.c:5013
0xd514f0 verify_gimple_in_cfg(function*, bool)
        ../../gcc-trunk/gcc/tree-cfg.c:5342
0xc0102e execute_function_todo
        ../../gcc-trunk/gcc/passes.c:2039
0xc01f12 execute_todo
        ../../gcc-trunk/gcc/passes.c:2093
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[558] %
[558] % cat small.c
int a;
unsigned b;

int main() {
  if (a) {
    goto L1;
    while (1)
      while (1) {
        long e = -1L, g;
        int f, h, i;
      L1:
        a = f;
      L2:
        g = e;
        f = h || g;
        e = ~(f & b);
        if (i || g < -1L) {
          ~(g || 0);
          break;
        }
        goto L2;
      }
  }
  return 0;
}