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GATE | GATE-CS-2006 | Question 42
A CPU has a five-stage pipeline and runs at 1 GHz frequency. Instruction fetch happens in the first stage of the pipeline. A conditional branch instruction
computes the target address and evaluates the condition in the third stage of the pipeline. The processor stops fetching new instructions following a conditional branch until the branch outcome is known. A program executes 109 instructions out of which 20% are conditional branches. If each instruction takes one cycle to complete on average, the total execution time of the program is:
(A)
1.0 second
(B)
1.2 seconds
(C)
1.4 seconds
(D)
1.6 seconds
Answer
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