Operation

IF AddressSize = 16
THEN use ES:DI for DestReg
ELSE (* AddressSize = 32 *) use ES:EDI for DestReg;
FI;
IF byte type of instruction
THEN
(ES:DestReg) AL;
IF DF = 0
THEN DestReg DestReg + 1;
ELSE DestReg DestReg - 1;
FI;
ELSE IF OperandSize = 16
THEN
(ES:DestReg) AX;
IF DF = 0
THEN DestReg DestReg + 2;
ELSE DestReg DestReg - 2;
FI;
ELSE (* OperandSize = 32 *)
(ES:DestReg) EAX;
IF DF = 0
THEN DestReg DestReg + 4;
ELSE DestReg DestReg - 4;
FI;
FI;
FI;

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