https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80728
--- Comment #4 from Alexander Monakov <amonakov at gcc dot gnu.org> --- ipa-reference.c has: /* Set of all interesting module statics. A bit is set for every module static we are considering. This is added to the local info when asm code is found that clobbers all memory. */ static bitmap all_module_statics; but I don't see where the code implementing the last statement in the comment is. I only see how indirect calls are handled (and I think barriers due to atomics and asms can be handled in a similar fashion).
