https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Thomas de Bock from comment #18) > (In reply to Jason Merrill from comment #17) > > As I commented at > > > > https://inbox.sourceware.org/gcc-patches/75ff8af8-af03-42fa-b68b- > > e6c16a34c...@redhat.com/ > > > > we could optimize the dynamic_cast to type_info::operator== instead of > > vtable comparison. > > I agree having dynamic_cast be optimized to type_info::operator== when it > can (and when optimizations are enabled) would be good. Like I said though I > also think having an optimal optimization that just checks vtables ptrs is > important to have available behind some compiler flags as well. With <typeinfo> being included, that option would already exist, -D__GXX_MERGED_TYPEINFO_NAMES=1
