[Bug c/104446] New: [9/10/11/12 Regression] ICE in trunc_int_for_mode, at explow.cc:59

["gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104446

            Bug ID: 104446
           Summary: [9/10/11/12 Regression] ICE in trunc_int_for_mode, at
                    explow.cc:59
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

With file ./gcc.target/i386/pr65588.c :


$ gcc-12-20220206 -c pr65588.c -O2 -m32 -mrtd -finstrument-functions
during RTL pass: combine
pr65588.c: In function 't':
pr65588.c:10:19: internal compiler error: in trunc_int_for_mode, at
explow.cc:59
   10 | int t () { a = 0; }
      |                   ^
0x8b5d13 trunc_int_for_mode(long, machine_mode)
        ../../gcc/explow.cc:59
0x8b5d28 trunc_int_for_mode(poly_int<1u, long>, machine_mode)
        ../../gcc/explow.cc:86
0x8aa928 gen_int_mode(poly_int<1u, long>, machine_mode)
        ../../gcc/emit-rtl.cc:542
0xbc3d78 for_each_inc_dec_find_inc_dec
        ../../gcc/rtlanal.cc:3711
0xbc3d78 for_each_inc_dec(rtx_def*, int (*)(rtx_def*, rtx_def*, rtx_def*,
rtx_def*, rtx_def*, void*), void*)
        ../../gcc/rtlanal.cc:3750
0x17597af try_combine
        ../../gcc/combine.cc:3346
0x175f3cc combine_instructions
        ../../gcc/combine.cc:1269
0x175f3cc rest_of_handle_combine
        ../../gcc/combine.cc:14922
0x175f3cc execute
        ../../gcc/combine.cc:14967