[Bug target/106577] New: [13 Regression] during RTL pass: subreg3 ICE: in extract_insn, at recog.cc:2791 (unrecognizable insn) with -O -mavx

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106577

            Bug ID: 106577
           Summary: [13 Regression] during RTL pass: subreg3 ICE: in
                    extract_insn, at recog.cc:2791 (unrecognizable insn)
                    with -O -mavx
           Product: gcc
           Version: 13.0
            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 53429
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53429&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O -mavx testcase.c
testcase.c: In function 'foo':
testcase.c:4:1: error: unrecognizable insn:
    4 | }
      | ^
(insn 28 27 30 2 (parallel [
            (set (reg:TI 98)
                (and:TI (reg:V4SI 100)
                    (reg:TI 99)))
            (clobber (reg:CC 17 flags))
        ]) "testcase.c":3:8 -1
     (nil))
during RTL pass: subreg3
testcase.c:4:1: internal compiler error: in extract_insn, at recog.cc:2791
0x77b2c8 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:108
0x77b34b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /repo/gcc-trunk/gcc/rtl-error.cc:116
0x769bfd extract_insn(rtx_insn*)
        /repo/gcc-trunk/gcc/recog.cc:2791
0x24ab7b7 decompose_multiword_subregs
        /repo/gcc-trunk/gcc/lower-subreg.cc:1555
0x24ac8dd execute
        /repo/gcc-trunk/gcc/lower-subreg.cc:1820
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-r13-2009-20220810070724-gc16d9f78dc8-checking-yes-rtl-df-extra-nobootstrap-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
--disable-bootstrap --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-r13-2009-20220810070724-gc16d9f78dc8-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.0 20220810 (experimental) (GCC)