[Bug target/65676] New: ICE: in extract_insn, at recog.c:2343 (unrecognizable insn) with -mavx512f -funsigned-char and __builtin_ia32_pmovsxwq512_mask()

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65676

            Bug ID: 65676
           Summary: ICE: in extract_insn, at recog.c:2343 (unrecognizable
                    insn) with -mavx512f -funsigned-char and
                    __builtin_ia32_pmovsxwq512_mask()
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz

Created attachment 35235
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35235&action=edit
reduced testcase

Compiler output:
$ gcc testcase.c -mavx512f -funsigned-char
testcase.c: In function 'foo':
testcase.c:7:1: error: unrecognizable insn:
 }
 ^
(insn 8 7 9 2 (set (reg:QI 90)
        (const_int 255 [0xff])) testcase.c:6 -1
     (nil))
testcase.c:7:1: internal compiler error: in extract_insn, at recog.c:2343
0xbd2e38 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /mnt/svn/gcc-trunk/gcc/rtl-error.c:110
0xbd2ec8 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /mnt/svn/gcc-trunk/gcc/rtl-error.c:118
0xb89698 extract_insn(rtx_insn*)
        /mnt/svn/gcc-trunk/gcc/recog.c:2343
0x962e67 instantiate_virtual_regs_in_insn
        /mnt/svn/gcc-trunk/gcc/function.c:1598
0x962e67 instantiate_virtual_regs
        /mnt/svn/gcc-trunk/gcc/function.c:1966
0x962e67 execute
        /mnt/svn/gcc-trunk/gcc/function.c:2015
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r221818 - ICE