https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103510
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Funny there is a comment in the libgcc sources: /* This will segfault if the register hasn't been saved. */ Which has been there since day 1 of IA-64 ABI exception handling back in g:52a11cbfcf0cfb32628b6953588b6af4037ac0b6