https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94218
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #4) > "This can make __builtin_setjmp and __builtin_longjmp more efficient than > their library counterparts in some cases, but it can also cause incorrect > and mysterious behavior when mixing with code that uses the full register > set." CET is considered register set differences.