_atomic_cas_16_up
_atomic_cas_16_fn = _atomic_cas_16_up;
extern uint16_t _atomic_cas_16_up(volatile uint16_t *, uint16_t, uint16_t);
static uint16_t _atomic_cas_16_up(volatile uint16_t *, uint16_t, uint16_t);
_atomic_cas_16_up;