[Bug tree-optimization/113144] New: [14 regression] ICE when building dpkg-1.21.15 in verify_dominators (error: dominator of 9 should be 48, not 12)

["sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113144

            Bug ID: 113144
           Summary: [14 regression] ICE when building dpkg-1.21.15 in
                    verify_dominators (error: dominator of 9 should be 48,
                    not 12)
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
  Target Milestone: ---

Good morning!

Hit this when building dpkg-1.21.15:

```
$ gcc -c tarfn.i -O3 -march=znver2
tarfn.c: In function ‘tar_atosl’:
tarfn.c:195:1: error: dominator of 9 should be 48, not 12
during GIMPLE pass: vect
tarfn.c:195:1: internal compiler error: in verify_dominators, at
dominance.cc:1194
0x561a07fcf5ea verify_dominators(cdi_direction)
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/dominance.cc:1194
0x561a091d1199 checking_verify_dominators(cdi_direction)
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/dominance.h:76
0x561a091d1199 slpeel_tree_duplicate_loop_to_edge_cfg(loop*, edge_def*, loop*,
edge_def*, edge_def*, edge_def**, bool, vec<basic_block_def*, va_heap,
vl_ptr>*)
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/tree-vect-loop-manip.cc:1846
0x561a091d3b38 vect_do_peeling(_loop_vec_info*, tree_node*, tree_node*,
tree_node**, tree_node**, tree_node**, int, bool, bool, tree_node**)
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/tree-vect-loop-manip.cc:3307
0x561a091c2dd7 vect_transform_loop(_loop_vec_info*, gimple*)
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/tree-vect-loop.cc:11911
0x561a0920b2f2 vect_transform_loops
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/tree-vectorizer.cc:1006
0x561a0920b956 try_vectorize_loop_1
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/tree-vectorizer.cc:1152
0x561a0920b956 try_vectorize_loop
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/tree-vectorizer.cc:1182
0x561a0920bf74 execute
       
/usr/src/debug/sys-devel/gcc-14.0.0.9999/gcc-14.0.0.9999/gcc/tree-vectorizer.cc:1298
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
```

```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/14/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-14.0.0.9999/work/gcc-14.0.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/14
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/14/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl,df
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 14.0.0 p,
commit 2250dc0cc8c46999ad1c1d79b9aeed9056459bb6' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-multilib --with-multilib-list=m32,m64 --disable-fixed-point
--enable-targets=all --enable-libgomp --disable-libssp --disable-libada
--disable-cet --disable-systemtap --disable-valgrind-annotations
--disable-vtable-verify --disable-libvtv --with-zstd --without-isl
--enable-default-pie --enable-host-pie --disable-host-bind-now
--enable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231225 (experimental)
0beeddd6b1b1cb41104c4df925323e8fc0437ba8 (Gentoo 14.0.0 p, commit
2250dc0cc8c46999ad1c1d79b9aeed9056459bb6)
```