[Bug target/103894] New: ICE: in emit_move_multi_word, at expr.c:3870 with -mno-sse2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103894

            Bug ID: 103894
           Summary: ICE: in emit_move_multi_word, at expr.c:3870 with
                    -mno-sse2
           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 52110
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52110&action=edit
reduced testcase

This seems to be a recent regression.

Compiler output:
$ x86_64-pc-linux-gnu-gcc -mno-sse2 testcase.c 
during RTL pass: reload
testcase.c: In function 'foo':
testcase.c:9:1: internal compiler error: in emit_move_multi_word, at
expr.c:3870
    9 | }
      | ^
0x6c6c3b emit_move_multi_word
        /repo/gcc-trunk/gcc/expr.c:3870
0xfa3d0b gen_move_insn(rtx_def*, rtx_def*)
        /repo/gcc-trunk/gcc/expr.c:4145
0x11ade8d curr_insn_transform
        /repo/gcc-trunk/gcc/lra-constraints.c:4214
0x11af026 lra_constraints(bool)
        /repo/gcc-trunk/gcc/lra-constraints.c:5161
0x1199994 lra(_IO_FILE*)
        /repo/gcc-trunk/gcc/lra.c:2336
0x114c429 do_reload
        /repo/gcc-trunk/gcc/ira.c:5932
0x114c429 execute
        /repo/gcc-trunk/gcc/ira.c:6118
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-r12-6173-20220102211314-g9ff206d3865-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/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
--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-r12-6173-20220102211314-g9ff206d3865-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20220102 (experimental) (GCC)