IF Instruction is LIDT
    THEN
         IF OperandSize = 16
              THEN
                    IDTR(Limit) ← SRC[0:15];
                    IDTR(Base) ← SRC[16:47] AND 00FFFFFFH;
              ELSE IF 32-bit Operand Size
                    THEN
                         IDTR(Limit) ← SRC[0:15];
                         IDTR(Base) ← SRC[16:47];
                    FI;
              ELSE IF 64-bit Operand Size (* In 64-Bit Mode *)
                    THEN
                         IDTR(Limit) ← SRC[0:15];
                         IDTR(Base) ← SRC[16:79];
                    FI;
         FI;
    ELSE (* Instruction is LGDT *)
         IF OperandSize = 16
              THEN
                    GDTR(Limit) ← SRC[0:15];
                    GDTR(Base) ← SRC[16:47] AND 00FFFFFFH;
              ELSE IF 32-bit Operand Size
                    THEN
                         GDTR(Limit) ← SRC[0:15];
                         GDTR(Base) ← SRC[16:47];
                    FI;
              ELSE IF 64-bit Operand Size (* In 64-Bit Mode *)
                    THEN
                         GDTR(Limit) ← SRC[0:15];
                         GDTR(Base) ← SRC[16:79];
                    FI;
         FI;
FI;