[Bug target/78227] New: ICE: unrecognizable insn: in extract_insn, at recog.c:2311 with -mavx512bw

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78227

            Bug ID: 78227
           Summary: ICE: unrecognizable insn: in extract_insn, at
                    recog.c:2311 with -mavx512bw
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu
             Build: x86_64-pc-linux-gnu

Created attachment 39974
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39974&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -mavx512bw testcase.c         
testcase.c: In function 'foo':
testcase.c:7:1: error: unrecognizable insn:
 }
 ^
(insn 8 7 9 2 (set (reg:V32HI 87 [ _2 ])
        (unspec:SI [
                (reg:V32HI 90)
                (reg:V32HI 89)
            ] UNSPEC_MASKED_GT)) "testcase.c":6 -1
     (nil))
testcase.c:7:1: internal compiler error: in extract_insn, at recog.c:2311
0xb62d03 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.c:108
0xb62d9b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /repo/gcc-trunk/gcc/rtl-error.c:116
0xb18967 extract_insn(rtx_insn*)
        /repo/gcc-trunk/gcc/recog.c:2311
0x8ca4bd instantiate_virtual_regs_in_insn
        /repo/gcc-trunk/gcc/function.c:1581
0x8ca4bd instantiate_virtual_regs
        /repo/gcc-trunk/gcc/function.c:1948
0x8ca4bd execute
        /repo/gcc-trunk/gcc/function.c:1997
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.

$ x86_64-pc-linux-gnu-gcc -v                   
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-241681-checking-yes-rtl-df-extra-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--without-cloog --without-ppl --without-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-241681-checking-yes-rtl-df-extra-nographite-amd64
Thread model: posix
gcc version 7.0.0 20161029 (experimental) (GCC)