TTEST Test transaction state This instruction writes the depth of the transaction to the destination register, or the value 0 otherwise. 1 1 0 1 0 1 0 1 0 0 1 0 0 0 1 1 0 0 1 1 0 0 0 1 0 1 1 TTEST <Xt> if !IsFeatureImplemented(FEAT_TME) then UNDEFINED; constant integer t = UInt(Rt); <Xt> Is the 64-bit name of the general-purpose destination register, encoded in the "Rt" field. if !IsTMEEnabled() then UNDEFINED; X[t, 64] = (TSTATE.depth)<63:0>;