Mnemonic: SET1 reg/mem,CL/immediate

          SET1 r/m8,imm3 : 0F 1C [mod:000:r/m] imm  (5/14 clocks)
          SET1 r/m16,CL  : 0F 15 [mod:000:r/m]      (4/13 clocks)
          SET1 r/m16,imm4: 0F 1D [mod:000:r/m] imm  (5/14 clocks)
          SET1 CY        : F9   (NEC nomenclature for Intel's STC)
          SET1 DIR       : FD   (NEC nomenclature for Intel's STD)