[Bug target/100736] New: ICE: unrecognizable insn

["asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100736

            Bug ID: 100736
           Summary: ICE: unrecognizable insn
           Product: gcc
           Version: 12.0
            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: powerpc-*-linux-gnu

gcc-12.0.0-alpha20210523 snapshot (g:c01c4331112aaf45f0de20ed8883dbeab83ed896)
ICEs when compiling the following testcase, reduced from
gcc/testsuite/gcc.target/powerpc/bcd-4.c, w/ -mvsx -mpower8-vector
-ffinite-math-only:

typedef __attribute__ ((altivec (vector__))) unsigned char v;

int
foo (v a, v b)
{
  return __builtin_vec_bcdsub_ge (a, b, 0);
}

% powerpc-e300c3-linux-gnu-gcc-12.0.0 -mvsx -mpower8-vector -ffinite-math-only
-c ktvdviry.c
ktvdviry.c: In function 'foo':
ktvdviry.c:7:1: error: unrecognizable insn:
    7 | }
      | ^
(insn 10 9 13 2 (set (reg:SI 119 [ _5 ])
        (ge:SI (reg:CCFP 106 6)
            (const_int 0 [0]))) "ktvdviry.c":6:10 -1
     (nil))
during RTL pass: vregs
ktvdviry.c:7:1: internal compiler error: in extract_insn, at recog.c:2770
0x6912fa _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.0_alpha20210523/work/gcc-12-20210523/gcc/rtl-error.c:108
0x69131a _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.0_alpha20210523/work/gcc-12-20210523/gcc/rtl-error.c:116
0x68f987 extract_insn(rtx_insn*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.0_alpha20210523/work/gcc-12-20210523/gcc/recog.c:2770
0xaf6de1 instantiate_virtual_regs_in_insn
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.0_alpha20210523/work/gcc-12-20210523/gcc/function.c:1609
0xaf6de1 instantiate_virtual_regs
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.0_alpha20210523/work/gcc-12-20210523/gcc/function.c:1983
0xaf6de1 execute
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.0_alpha20210523/work/gcc-12-20210523/gcc/function.c:2032