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Phrases Previous Year Questions (PYQs)
Phrases Organization Of A Computer PYQ
The time required for fetching and execution of one
simple machine instruction is known as
Go to Discussion
Solution
Consider the program below which uses
six temporary variables a, b, c, d, e, and f.
a = 10
b = 20
c = 30
d=a+c
f=c+c
b=c+e
e=b+f
d=5+e
return d+f
Assuming that all the above operations take their operands from registers, the minimum number of registers needed to execute this program without spilling is
Assuming that all the above operations
take their operands from registers, the minimum number of registers needed to execute
this program without spilling is
Go to Discussion
Solution
Detailed Register Allocation Analysis
Objective: Determine the minimum number of registers needed to execute the program without spilling.
Live Range Analysis:
- a: Line 1 → 4
- b: Line 6 → 7
- c: Line 3 → 6
- d: Line 8 → 9
- e: Line 7 → 8
- f: Line 5 → 9
Max live variables: 3 (after lines 6 and 7)
✅ Final Answer: 3 registers are required to execute the program without spilling.
Which
of the following components is not a part of an instruction formation in CPU
processing?
Go to Discussion
Solution
Instruction Formation in CPU Processing
Question: Which of the following is not a part of instruction formation?
Options:
- Opcode
- Register file
- Source operand
- Destination operand
✅ Correct Answer: Register File
Explanation:
- Opcode, Source operand, Destination operand — all are part of the instruction format.
- Register File — a hardware structure that stores registers, but it is not encoded into the instruction.
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