[Bug target/82420] ICE with -malign-int and -m68000

["mikpelinux at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82420

--- Comment #3 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Still ICEs in gcc-12:

> gcc/xgcc -Bgcc -march=68000 -malign-int -S /tmp/pr82420.c
during RTL pass: expand
/tmp/pr82420.c: In function 'f':
/tmp/pr82420.c:3:4: internal compiler error: Segmentation fault
    3 |  a /= 3;
      |    ^~
0x95fe3f crash_signal
        /tmp/gcc-12-20210711/gcc/toplev.c:328
0x6c30a2 assign_temp(tree_node*, int, int)
        /tmp/gcc-12-20210711/gcc/function.c:976
0x67e321 emit_push_insn(rtx_def*, machine_mode, tree_node*, rtx_def*, unsigned
int, int, rtx_def*, poly_int<1u, long>, rtx_def*, rtx_def*, int, rtx_def*,
bool)
        /tmp/gcc-12-20210711/gcc/expr.c:4621
0x559c98 emit_library_call_value_1(int, rtx_def*, rtx_def*, libcall_type,
machine_mode, int, std::pair<rtx_def*, machine_mode>*)
        /tmp/gcc-12-20210711/gcc/calls.c:5595
0x86de22 emit_library_call_value(rtx_def*, rtx_def*, libcall_type,
machine_mode, rtx_def*, machine_mode, rtx_def*, machine_mode)
        /tmp/gcc-12-20210711/gcc/rtl.h:4390
0x86de22 expand_binop(machine_mode, optab_tag, rtx_def*, rtx_def*, rtx_def*,
int, optab_methods)
        /tmp/gcc-12-20210711/gcc/optabs.c:2172
0x86f9e6 sign_expand_binop(machine_mode, optab_tag, optab_tag, rtx_def*,
rtx_def*, rtx_def*, int, optab_methods)
        /tmp/gcc-12-20210711/gcc/optabs.c:2304
0x665e44 expand_divmod(int, tree_code, machine_mode, rtx_def*, rtx_def*,
rtx_def*, int, optab_methods)
        /tmp/gcc-12-20210711/gcc/expmed.c:5271
0x66fdad expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /tmp/gcc-12-20210711/gcc/expr.c:9473
0x57296a expand_gimple_stmt_1
        /tmp/gcc-12-20210711/gcc/cfgexpand.c:3980
0x57296a expand_gimple_stmt
        /tmp/gcc-12-20210711/gcc/cfgexpand.c:4041
0x577392 expand_gimple_basic_block
        /tmp/gcc-12-20210711/gcc/cfgexpand.c:6083
0x579196 execute
        /tmp/gcc-12-20210711/gcc/cfgexpand.c:6809
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.

The SEGV occurs because emit_library_call_value_1 () [calls.c line 5595] calls
emit_push_insn () with NULL_TREE for TYPE, emit_push_insn () in this test case
needs to call assign_temp () [expr.c line 4621] with the given TYPE, but
assign_temp () fundamentally requires a non-NULL_TREE TYPE.