[Bug tree-optimization/114251] New: [14 regression] ICE when building python-3.12.2's Hacl_Hash_SHA2.c (tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.cc:85)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114251

            Bug ID: 114251
           Summary: [14 regression] ICE when building python-3.12.2's
                    Hacl_Hash_SHA2.c (tree check: expected class ‘type’,
                    have ‘exceptional’ (error_mark) in
                    useless_type_conversion_p, at gimple-expr.cc:85)
           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: ---

Created attachment 57625
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57625&action=edit
Hacl_Hash_SHA2.i

```
$ gcc -c Hacl_Hash_SHA2.i -O2 -march=znver2 -fprofile-generate
during GIMPLE pass: slp
./Modules/_hacl/Hacl_Hash_SHA2.c: In function ‘sha512_update’:
./Modules/_hacl/Hacl_Hash_SHA2.c:269:24: internal compiler error: tree check:
expected class ‘type’, have ‘exceptional’ (error_mark) in
useless_type_conversion_p, at gimple-expr.cc:85
0x55e2e7432cd4 tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        /usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/tree.cc:9005
0x55e2e65ba852 tree_class_check(tree_node*, tree_code_class, char const*, int,
char const*)
        /usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/tree.h:3767
0x55e2e65ba852 useless_type_conversion_p(tree_node*, tree_node*)
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/gimple-expr.cc:85
0x55e2e7e82a8e verify_gimple_assign_binary
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/tree-cfg.cc:4305
0x55e2e7e2bf9b verify_gimple_in_cfg(function*, bool, bool)
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/tree-cfg.cc:5599
0x55e2e7ca5a38 execute_function_todo
        /usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/passes.cc:2088
0x55e2e7ca5a38 do_per_function
        /usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/passes.cc:1687
0x55e2e7ca5a38 execute_todo
        /usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/passes.cc:2142
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-14.0.9999/work/gcc-14.0.9999/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,rust --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo Hardened
14.0.9999 p, commit c8305c9bdf09abe3e2f89783fe62f2e4049468fa'
--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 --enable-valgrind-annotations --disable-vtable-verify
--disable-libvtv --with-zstd --with-isl --disable-isl-version-check
--enable-default-pie --enable-host-pie --enable-host-bind-now
--enable-default-ssp --disable-fixincludes --with-build-config='bootstrap-O3
bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240305 (experimental)
8776468d9e57ace5f832c1368243a6dbce9984d5 (Gentoo Hardened 14.0.9999 p, commit
c8305c9bdf09abe3e2f89783fe62f2e4049468fa)
```