cyc_to_ns
res = cyc_to_ns(1ULL, new_mult, new_shift);
ns = rd.epoch_ns + cyc_to_ns((cyc - rd.epoch_cyc) & rd.sched_clock_mask, rd.mult, rd.shift);
ns = rd.epoch_ns + cyc_to_ns((cyc - rd.epoch_cyc) & rd.sched_clock_mask, rd.mult, rd.shift);
res = cyc_to_ns(1ULL, new_mult, new_shift);
res = rd->epoch_ns + cyc_to_ns(cyc, rd->mult, rd->shift);