[Bug target/94438] New: [8/9/10 Regression] ICE: verify_gimple failed: position plus size exceeds size of referenced object in 'bit_field_ref' with -mavx512vbmi -mavx512vl

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94438

            Bug ID: 94438
           Summary: [8/9/10 Regression] ICE: verify_gimple failed:
                    position plus size exceeds size of referenced object
                    in 'bit_field_ref' with -mavx512vbmi -mavx512vl
           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 48161
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48161&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -mavx512vbmi -mavx512vl testcase.c 
testcase.c: In function 'foo':
testcase.c:4:1: error: position plus size exceeds size of referenced object in
'bit_field_ref'
    4 | foo (void)
      | ^~~
_8 = BIT_FIELD_REF <_7, 128, 0>;
during GIMPLE pass: veclower
testcase.c:4:1: internal compiler error: verify_gimple failed
0x102b7aa verify_gimple_in_cfg(function*, bool)
        /repo/gcc-trunk/gcc/tree-cfg.c:5459
0xeed15f execute_function_todo
        /repo/gcc-trunk/gcc/passes.c:1985
0xeedfac do_per_function
        /repo/gcc-trunk/gcc/passes.c:1640
0xeedfac execute_todo
        /repo/gcc-trunk/gcc/passes.c:2039
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/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r10-7475-20200331110822-g1ef979c6966-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-r10-7475-20200331110822-g1ef979c6966-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200331 (experimental) (GCC)