[Bug c/86123] New: [8/9 Regression] ICE in prepare_cmp_insn, at optabs.c:3967

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86123

            Bug ID: 86123
           Summary: [8/9 Regression] ICE in prepare_cmp_insn, at
                    optabs.c:3967
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Introduced between 20170924 and 20171008, at -O[gs123] :


$ cat z1.c
_Bool f1(_Complex unsigned x, _Complex unsigned y)
{
  _Complex unsigned t1 = x / y;
  _Bool t2 = (t1 != 0);
  return t2;
}
_Bool f2(_Complex unsigned x, _Complex unsigned y)
{
  _Complex unsigned t1 = x / y;
  _Bool t2 = (t1 == 0);
  return t2;
}


$ gcc-8-20170924 -c z1.c -O2
$
$ gcc-9-20180610 -c z1.c -O2
during RTL pass: expand
z1.c: In function 'f1':
z1.c:5:10: internal compiler error: in prepare_cmp_insn, at optabs.c:3967
   return t2;
          ^~
0x9b3ae3 prepare_cmp_insn
        ../../gcc/optabs.c:3967
0x9b3b65 emit_cmp_and_jump_insns(rtx_def*, rtx_def*, rtx_code, rtx_def*,
machine_mode, int, rtx_def*, profile_probability)
        ../../gcc/optabs.c:4113
0x76decb do_compare_rtx_and_jump(rtx_def*, rtx_def*, rtx_code, int,
machine_mode, rtx_def*, rtx_code_label*, rtx_code_label*, profile_probability)
        ../../gcc/dojump.c:1164
0x7e89a2 emit_store_flag_force(rtx_def*, rtx_code, rtx_def*, rtx_def*,
machine_mode, int, int)
        ../../gcc/expmed.c:6149
0x805c7f do_store_flag
        ../../gcc/expr.c:11582
0x805c7f expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        ../../gcc/expr.c:9299
0x7f6ef4 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../gcc/expr.c:9828
0x7052ce expand_expr
        ../../gcc/expr.h:279
0x7052ce expand_return
        ../../gcc/cfgexpand.c:3504
0x7052ce expand_gimple_stmt_1
        ../../gcc/cfgexpand.c:3607
0x7052ce expand_gimple_stmt
        ../../gcc/cfgexpand.c:3734
0x706243 expand_gimple_basic_block
        ../../gcc/cfgexpand.c:5762
0x70b5e6 execute
        ../../gcc/cfgexpand.c:6365