Question

How many memory operations are required to perform an add operation on a 3-address architecture if each operand specifies an indirect memory reference?  

Answer 1

Since the operand is indirect memory reference, accessing each operand will require 2 memory operations .

One memory operation to get the address of memory location where the data is stored and second memory operation to get data from memory location. So total of 4 memory operations to get the 2 operand for ADD operation.

And one more memory operation is required to perform ADD operation.

So total # of memory operation required is 5.

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