GATE | GATE-CS-2015 (Set 1) | Question 65

For computers based on three-address instruction formats, each address field can be used to specify which of the following:

S1: A memory operand
S2: A processor register
S3: An implied accumulator register

(A) Either S1 or S2
(B) Either S2 or S3
(C) Only S2 and S3
(D) All of S1, S2 and S3


Answer: (A)

Explanation: In Three address instruction format, each operand specifies either a memory address or a register. See

http://homepage.cs.uiowa.edu/~ghosh/1-19-06.pdf

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