[Bug target/82983] New: [8 Regression] ICE in extract_insn, at recog.c:2305 w/ GFMI

["marxin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82983

            Bug ID: 82983
           Summary: [8 Regression] ICE in extract_insn, at recog.c:2305 w/
                    GFMI
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jkoval at gcc dot gnu.org, kyukhin at gcc dot gnu.org
  Target Milestone: ---

Following ICEs:

$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/gfni-4.c
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/gfni-4.c: In
function ‘avx512vl_test’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/gfni-4.c:16:1:
error: unrecognizable insn:
 }
 ^
(insn 9 8 10 2 (set (reg:V16QI 91 [ _5 ])
        (unspec:V16QI [
                (reg:V16QI 90 [ _4 ])
                (reg:V16QI 88 [ _2 ])
                (const_int 3 [0x3])
            ] UNSPEC_GF2P8AFFINEINV))
"/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/gfni-4.c":14 -1
     (nil))
during RTL pass: vregs
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/gfni-4.c:16:1:
internal compiler error: in extract_insn, at recog.c:2305
0xeb6add _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc/rtl-error.c:108
0xeb6b1e _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc/rtl-error.c:116
0xe58259 extract_insn(rtx_insn*)
        ../../gcc/recog.c:2305
0xb57803 instantiate_virtual_regs_in_insn
        ../../gcc/function.c:1591
0xb58cdd instantiate_virtual_regs
        ../../gcc/function.c:1959
0xb58dac execute
        ../../gcc/function.c:2008

It's compiled with -mtune=generic -march=x86-64