[Bug tree-optimization/112809] New: during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112809

            Bug ID: 112809
           Summary: during GIMPLE pass: bitintlower ICE: in
                    limb_access_type, at gimple-lower-bitint.cc:563 at -O1
                    and above
           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 56752
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56752&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O testcase.c 
during GIMPLE pass: bitintlower
testcase.c: In function 'foo':
testcase.c:6:1: internal compiler error: in limb_access_type, at
gimple-lower-bitint.cc:563
    6 | foo (void)
      | ^~~
0xd520e1 limb_access_type
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:563
0x2535e97 limb_access_type
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:559
0x2535e97 limb_access
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:578
0x2546609 lower_mergeable_stmt
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:2693
0x254af8d lower_stmt
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:5265
0x254d626 gimple_lower_bitint
        /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:6394
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-r14-6051-20231201105652-gb1fe98dee21-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-r14-6051-20231201105652-gb1fe98dee21-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231201 (experimental) (GCC)