Three Address Instructions

     Three address instructions computer needs three register address fields. The register address field may be a processor register or a memory operand. Cyber 170 computer needs three address instructions .

ADD R1, R2, R3

The above instruction denotes the operations,

R1 <-- R2 + R3 (arithmetic addition)

Where

         R2, R3 = Source registers

         R1 = Destination register

For Example:

           ADD R1, A, B
           R1M[A] + M[B]
 

     As shown, it is clear that in the instruction 3 addresses  are specified. In the above instruction one register address and two memory addresses are specified. Example of computer using this type of instructions Cyber 170.

 

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