https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111246
--- Comment #7 from David Edelsohn <dje at gcc dot gnu.org> --- Have you reached out to Paul McKenney (now at Meta) who suggested the instruction sequences to implement the C/C++ memory for PowerPC? https://open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2745.html