1
GATE CSE 2023
Numerical
+1
-0.33

Consider a 3-stage pipelined processor having a delay of 10 ns (nanoseconds), 20 ns, and 14 ns, for the first, second, and the third stages, respectively. Assume that there is no other delay and the processor does not suffer from any pipeline hazards. Also assume that one instruction is fetched every cycle.

The total execution time for executing 100 instructions on this processor is ___________ ns.

Your input ____
2
GATE CSE 2022
Numerical
+1
-0.33

A processor X1 operating at 2 GHz has a standard 5-stage RISC instruction pipeline having a base CPI (cycles per instruction) of one without any pipeline hazards. For a given program P that has 30% branch instructions, control hazards incur 2 cycles stall for every branch. A new version of the processor X2 operating at same clock frequency has an additional branch predictor unit (BPU) that completely eliminates stalls for correctly predicted branches. There is neither any savings nor any additional stalls for wrong predictions. There are no structural hazards and data hazards for X1 and X2. If the BPU has a prediction accuracy of 90%, the speed up (rounded off to two decimal places) obtained by X2 over X1 in executing P is ____________.

Your input ____
3
GATE CSE 2012
MCQ (Single Correct Answer)
+1
-0.3
Register renaming is done in pipelined processors
A
as an alternative to register allocation at compile time
B
for efficient access to function parameters and local variables
C
to handle certain kinds of hazards
D
as part of address translation
4
GATE CSE 2003
MCQ (Single Correct Answer)
+1
-0.3
For a pipelined $$CPU$$ with a single $$ALU$$, consider the following situations
$$1.\,\,\,\,\,$$ The $$j+1$$ instruction uses the result of the $$j$$-$$th$$ instruction as an operand
$$2.\,\,\,\,\,$$ The execution of a conditional jump instruction
$$3.\,\,\,\,\,$$ The $$j$$-$$th$$ and $$j+1$$ instruction require the $$ALU$$ at the same time

Which of the above can cause a hazard?

A
$$1$$ and $$2$$ only
B
$$2$$ and $$3$$ only
C
$$3$$ only
D
ALL the three
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