Express the statement X= (A*B)-(C*D)-E in the assembly language of each of 0- me

Question

Express the statement X= (A*B)-(C*D)-E in the assembly language of each of 0- memory address machine, 3-register address machine with 3 registers R1,R2,R3, and 2-memory-register-address machine with three registers R1,R2, R3. Your solution should use a minimum number of statements and a minimum number of memory accesses. Compute the number of memory accesses for data and for instructions using the following assumptions: Each memory access is of length one memory word; Opcode and any number of modes and register addresses require only one memory word.

Explanation / Answer

MOV R1,[0]

MOV R2,[0]

MOV R3,[0]

MOV A,R1 ; A=R1

MOV B,R2 ; B=R2

MULT A,B ; A=A*B

MOV C,R3 ;C=R3

MOV D, R1

MOV E, R2

MULT C,D ; C=C*D

SUB C,E ; C=C-E (C=(C*D)-E)

SUB A,C ; A=A-C (A=(A*B)-(C*D)-E)

MOV X, A ; X=A (X=(A*B)-(C*D)-E)

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