[Bug target/104462] New: ICE: in extract_constrain_insn_cached, at recog.cc:2682 with -mavx512fp16 -mno-xsave

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104462

            Bug ID: 104462
           Summary: ICE: in extract_constrain_insn_cached, at
                    recog.cc:2682 with -mavx512fp16 -mno-xsave
           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: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 52389
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52389&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -mavx512fp16 -mno-xsave testcase.c 
testcase.c: In function 'foo':
testcase.c:9:1: error: insn does not satisfy its constraints:
    9 | }
      | ^
(insn 127 9 11 2 (set (reg:V8HF 23 xmm3 [orig:87 _8 ] [87])
        (xor:V8HF (reg:V8HF 21 xmm1 [orig:86 _7 ] [86])
            (reg:V8HF 20 xmm0 [104]))) "testcase.c":8:8 2830 {*xorv8hf3}
     (nil))
during RTL pass: shorten
testcase.c:9:1: internal compiler error: in extract_constrain_insn_cached, at
recog.cc:2682
0x7680ff _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:108
0x768185 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:118
0x7570ad extract_constrain_insn_cached(rtx_insn*)
        /repo/gcc-trunk/gcc/recog.cc:2682
0x1b25c07 insn_default_length(rtx_insn*)
        /repo/gcc-trunk/gcc/config/i386/i386.md:18585
0xfbce3c shorten_branches(rtx_insn*)
        /repo/gcc-trunk/gcc/final.cc:1105
0xfbcf3f rest_of_handle_shorten_branches
        /repo/gcc-trunk/gcc/final.cc:4380
0xfbcf3f execute
        /repo/gcc-trunk/gcc/final.cc:4409
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> 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-r12-7124-20220209171435-g59b31f0e2d1-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.1/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
--with-cloog --with-ppl --with-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-r12-7124-20220209171435-g59b31f0e2d1-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.1 20220209 (experimental) (GCC)