NPTEL Computer Architecture Week 3 Assignment Answers 2024

NPTEL Computer Architecture Week 3 Assignment Answers 2024

1. A/an _____________ is a unique identifier for each machine instruction.

• stack pointer
• source register
• opcode
• None of the options

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2. For a store instruction, which of the following information is missing?

• source register
• destination register
• offset
• all of the options

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3. Under which flag condition does the ARM instruction addle perform addition?

• (Z = 1) OR (N = 1)
• (Z = 1) AND (N = 0)
• (Z = 0) OR (N = 0)
• (Z = 1) OR (N = 0)

Answer :- 

4. In the ARM ISA, the frame pointer register (fp) points to the top of the _______________.

• activation block
• stack
• L1 cache
• main memory

Answer :- 

5. How many bits are used to encode the instruction type (opcode) in the SimpleRisc ISA?

• 4
• 5
• 6
• 7

Answer :- 

6. Consider the following ARM assembly code sequence.

    mov r0, #8
    mov r1, #8
    mul r4, r0, r0
    mla r3, r4, r0, r1

What is the final value of r3?

• 8² + 8
• 8³ + 8
• 8⁴
• 8³

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7. Which of the following ARM assembly instructions computes r1= r2 + r3*4?

• add r1, r2, r3, asl #2
• add r1, r2, r3, asr #2
• add r1, r2, r3, lsr #2
• add r1, r2, r3, lsl #2

Answer :- 

8. In the ARM ISA, which of the following expressions is computed by the instruction “bic r1, r2, r3” ?

• r1 ← ~ r2 OR (r3)
• r1 ← r2 OR (~r3)
• r1 ← ~ r2 AND (r3)
• r1 ← r2 AND (~r3)

Answer :- 

9. Which of the following ARM instructions sets CPSR flags?

• cmn
• teq
• adds
• All of the options

Answer :- 

10. Which of the following instructions is not an unconditional branch instruction?

• bl
• b
• bx
• None of the options

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