WFIT Wait for interrupt with timeout This instruction is a hint instruction that indicates that the PE can enter a low-power state and remain there until either a local timeout event or a wakeup event occurs. For more information, see Wait For Interrupt. As described in Wait For Interrupt, the execution of a WFIT instruction that would otherwise cause entry to a low-power state can be trapped to a higher Exception level. 1 1 0 1 0 1 0 1 0 0 0 0 0 0 1 1 0 0 0 1 0 0 0 0 0 0 1 WFIT <Xt> if !IsFeatureImplemented(FEAT_WFxT) then UNDEFINED; constant integer d = UInt(Rd); <Xt> Is the 64-bit name of the general-purpose source register, encoded in the "Rd" field. constant integer localtimeout = UInt(X[d, 64]); if Halted() && ConstrainUnpredictableBool(Unpredictable_WFxTDEBUG) then ExecuteAsNOP(); Hint_WFI(localtimeout, WFxType_WFIT);