https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94603

            Bug ID: 94603
           Summary: ICE: in extract_insn, at recog.c:2343 (unrecognizable
                    insn) with -mno-sse2 and __builtin_ia32_movq128
           Product: gcc
           Version: 10.0
            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

Created attachment 48277
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48277&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -mno-sse2 testcase.c 
testcase.c: In function 'foo':
testcase.c:7:1: error: unrecognizable insn:
    7 | }
      | ^
(insn 7 6 8 2 (set (reg:V2DI 84)
        (vec_concat:V2DI (vec_select:DI (subreg:V2DI (reg:TI 85) 0)
                (parallel [
                        (const_int 0 [0])
                    ]))
            (const_int 0 [0]))) "testcase.c":6:10 -1
     (nil))
during RTL pass: vregs
testcase.c:7:1: internal compiler error: in extract_insn, at recog.c:2294
0x6d3efe _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.c:108
0x6d3f81 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /repo/gcc-trunk/gcc/rtl-error.c:116
0x6c3367 extract_insn(rtx_insn*)
        /repo/gcc-trunk/gcc/recog.c:2294
0xca8923 instantiate_virtual_regs_in_insn
        /repo/gcc-trunk/gcc/function.c:1607
0xca8923 instantiate_virtual_regs
        /repo/gcc-trunk/gcc/function.c:1977
0xca8923 execute
        /repo/gcc-trunk/gcc/function.c:2026
Please submit a full bug report,
with preprocessed source if appropriate.
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-r10-7691-20200412170534-g87be4cecfc6-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/10.0.1/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-r10-7691-20200412170534-g87be4cecfc6-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200412 (experimental) (GCC)

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