[Bug tree-optimization/113315] New: during GIMPLE pass: bitintlower0 ICE: in lower_mergeable_stmt, at gimple-lower-bitint.cc:2310 with _BitInt() used as array index

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113315

            Bug ID: 113315
           Summary: during GIMPLE pass: bitintlower0 ICE: in
                    lower_mergeable_stmt, at gimple-lower-bitint.cc:2310
                    with _BitInt() used as array index
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 57028
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57028&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc testcase.c 
during GIMPLE pass: bitintlower0
testcase.c: In function 'foo':
testcase.c:5:1: internal compiler error: in lower_mergeable_stmt, at
gimple-lower-bitint.cc:2310
    5 | foo (void)
      | ^~~
0xd7f264 lower_mergeable_stmt
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:2310
0x266953d lower_stmt
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:5320
0x266bf59 gimple_lower_bitint
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:6514
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-r14-7116-20240110185507-g52e809d5cf3-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/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-r14-7116-20240110185507-g52e809d5cf3-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20240110 (experimental) (GCC)