_atomic_cas_8_up
_atomic_cas_8_fn = _atomic_cas_8_up;
extern uint8_t _atomic_cas_8_up(volatile uint8_t *, uint8_t, uint8_t);
static uint8_t _atomic_cas_8_up(volatile uint8_t *, uint8_t, uint8_t);
_atomic_cas_8_up;