mftb
tb = mftb();
while (tb > mftb())
static inline u_quad_t mftb(void);
tb = mftb();
tb = mftb();
while (tb > mftb())
tb = mftb();
while (tb > mftb())
tb = mftb();
uint64_t now = mftb();
cpu->cpu_spl_tb[ipl][ci->ci_cpl] = mftb();
__func__, tf, mftb(), tf->tf_srr0, tf->tf_srr1,
const uint64_t now = mftb();
ci->ci_lastintr = ci->ci_lasttb = mftb();
tb = mftb();
tb = mftb();
tb = mftb();
tb = (u_int)(mftb() & 0x7fffffff);
cycles = mftb() - cycles;
cycles = mftb();
tb = mftb();
while (tb > mftb())
static inline u_quad_t mftb(void);
tb = mftb();
static inline u_quad_t mftb(void);
tb = mftb();
uint64_t tb = mftb();
tb = mftb();
static inline uint64_t mftb(void);