[Bug target/106933] New: [13 Regression] ICE in extract_insn, at recog.cc:2791 (error: unrecognizable insn)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106933

            Bug ID: 106933
           Summary: [13 Regression] ICE in extract_insn, at recog.cc:2791
                    (error: unrecognizable insn)
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: x86_64-unknown-linux-gnu

gcc 13.0.0 20220911 snapshot (g:0ea5e3f4542832b8da016b152695e64a2a386309) ICEs
when compiling the following testcase w/ -O2:

short int
bar (void);

__int128
empty (void)
{
}

__attribute__ ((simd)) int
foo (__int128 *p)
{
  int a = 0x80000000;

  *p = empty ();

  return *p == (a < bar ());
}

% x86_64-unknown-linux-gnu-gcc-13.0.0 -O2 -c ylbcgrld.c
ylbcgrld.c: In function 'foo.simdclone.2':
ylbcgrld.c:17:1: error: unrecognizable insn:
   17 | }
      | ^
(insn 73 72 74 3 (set (reg:CCZ 17 flags)
        (compare:CCZ (reg:V1TI 20 xmm0 [orig:82 D.2028 ] [82])
            (const_int 1 [0x1]))) "ylbcgrld.c":16:13 -1
     (expr_list:REG_DEAD (reg:V1TI 20 xmm0 [orig:82 D.2028 ] [82])
        (nil)))
during RTL pass: cprop_hardreg
ylbcgrld.c:17:1: internal compiler error: in extract_insn, at recog.cc:2791
0x730822 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/var/tmp/portage/sys-devel/gcc-13.0.0_p20220911/work/gcc-13-20220911/gcc/rtl-error.cc:108
0x73083e _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/var/tmp/portage/sys-devel/gcc-13.0.0_p20220911/work/gcc-13-20220911/gcc/rtl-error.cc:116
0x72edc3 extract_insn(rtx_insn*)
       
/var/tmp/portage/sys-devel/gcc-13.0.0_p20220911/work/gcc-13-20220911/gcc/recog.cc:2791
0xe4dc0b extract_constrain_insn(rtx_insn*)
       
/var/tmp/portage/sys-devel/gcc-13.0.0_p20220911/work/gcc-13-20220911/gcc/recog.cc:2690
0xe58de6 copyprop_hardreg_forward_1
       
/var/tmp/portage/sys-devel/gcc-13.0.0_p20220911/work/gcc-13-20220911/gcc/regcprop.cc:826
0xe59fbf execute
       
/var/tmp/portage/sys-devel/gcc-13.0.0_p20220911/work/gcc-13-20220911/gcc/regcprop.cc:1408