[Bug target/105993] New: [13 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1932 with -O -mxop

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105993

            Bug ID: 105993
           Summary: [13 Regression] ICE: RTL check: expected code 'reg',
                    have 'subreg' in rhs_regno, at rtl.h:1932 with -O
                    -mxop
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-checking, 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 53148
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53148&action=edit
reduced testcase

Note this might need a build with RTL checking enabled.

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O -mxop testcase.c 
during RTL pass: combine
testcase.c: In function 'foo':
testcase.c:14:1: internal compiler error: RTL check: expected code 'reg', have
'subreg' in rhs_regno, at rtl.h:1932
   14 | }
      | ^
0x772c96 rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
        /repo/gcc-trunk/gcc/rtl.cc:916
0xb925cf rhs_regno
        /repo/gcc-trunk/gcc/rtl.h:1932
0xb94e27 rhs_regno
        /repo/gcc-trunk/gcc/config/i386/sse.md:12506
0xb94e27 split_41
        /repo/gcc-trunk/gcc/config/i386/sse.md:23880
0x231fb05 combine_split_insns
        /repo/gcc-trunk/gcc/combine.cc:530
0x2327431 try_combine
        /repo/gcc-trunk/gcc/combine.cc:3561
0x232a694 combine_instructions
        /repo/gcc-trunk/gcc/combine.cc:1287
0x232a694 rest_of_handle_combine
        /repo/gcc-trunk/gcc/combine.cc:14976
0x232a694 execute
        /repo/gcc-trunk/gcc/combine.cc:15021
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-r13-1112-20220615134935-g49d14a841fd-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/13.0.0/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-r13-1112-20220615134935-g49d14a841fd-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.0 20220615 (experimental) (GCC)