Part 2: Memory Location Suppose A, X, Y, and Z are four computer memory location

Question

Part 2: Memory Location
Suppose A, X, Y, and Z are four computer memory locations that hold different values. Write a simple machine language program to compute A = X + Y - Z.
The computer has two registers (R1 and R2) dedicated to arithmetic operations and only the following operations:

LOAD R, M copy the value from memory location M (M is one of A, X, Y, or Z) into register R (R is either R1 or R2)
STORE R, M copy the value from register R into memory location M
ADD add the values of R1 and R2 together and store the result in R1
SUB subtract the value of R2 from R1 and store the result in R1
SWAP exchange the values stored in R1 and R2
HALT stop program execution
Write a sequence of instructions using only these operations to perform the computation and then stop program execution. Explain your reasoning.

Explanation / Answer

Load R1,X Load R2,0 ADD R2,R1 load R1,y Add R2,r1 load r1,z sub r2,z store R2,A Halt

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