NPTEL Computer Architecture Week 5 Assignment Answers 2024

NPTEL Computer Architecture Week 5 Assignment Answers 2024

1. In the x86 ISA, the instruction movzx copies a smaller register to a larger register and ___________.

• Pads the MSB bits with the sign bit
• Pads the MSB bits with 0s
• Pads the LSB bits with the sign bit
• Pads the LSB bits with 0s

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2. In the x86 ISA, the size corresponding to the modifier dword (double word) is _________ bits.

• 8
• 16
• 32
• 64

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3. Which instruction is not a single-operand ALU instruction in x86?

• inc
• dec
• adc
• neg

Answer :- 

4. Select the correct statement/s for the compare (cmp) instruction in x86. Choose the most appropriate option.

• It does not have an explicit destination operand.
• It performs the comparison by subtracting the value of the second operand from the first operand.
• It sets the values of the flags.
• All of the options

Answer :- 

5. Select the correct statement for the not instruction in x86.

• It requires an explicit destination operand.
• It computes the 1’s complement of the source operand.
• It computes the 2’s complement of the source operand.
• It sets the values of the flags.

Answer :- 

6. In the x86 ISA, the instruction rep inst executes the instruction inst n times where n is the value stored in the ______________ register.

• eax
• ebx
• ecx
• edx

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7. Consider the following x86 assembly code sequence.

mov eax, 0xdeeddeed
shr eax, 4

What is the final value of eax?

• 0xdeed0000
• 0xdeeddee
• 0xfdeeddee
• 0xdeed

Answer :- 

8. Select the correct statement/s for the x86 ISA. Choose the most appropriate option.

• The ffree instruction frees the register specified as an operand.
• The finit instruction resets the FP unit, frees all the registers, and resets the stack pointer.
• Using ffree to free the entire stack is a slow solution.
• All of the options

Answer :- 

9. In the x86 ISA, the instruction std sets the ____________ to ___________.

• DF (direction flag), 1
• DF (direction flag), 0
• Z (zero flag), 1
• S (sign flag), 1

Answer :- 

10. In the x86 ISA, the stosd instruction transfers the contents of ____ to the memory address specified by _____.

• eax, edi
• edi, eax
• ebx, edi
• eax, esi

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