АКОС КВИЗ №2

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АКОС КВИЗ №2

Lectures 3 - 5

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КНАД 1

КНАД 2

ЭАД 1

ЭАД 2

ЭАД 3

ВСН

Other:

Task 1 (1 pt): Look at Picture 1. It can be seen that the block of RISC-V assembly code follows the operation on registers defined in magenta color under the comment above. Now look at Picture 2. Describe, which operation does the block of code in that picture describe? Write it down in the format that follows the commented operation in Picture one.

Notation: (you can use it as is) x5, x6, x7 for registers. | for "or", ^ for "xor", & for "and", ~ for "not", A>> for the right arithmetic shift, L>> for right logical shift, << for left shift, + for addition, - for subtraction, * for multiplication, / for division. // for integer division, % for modulus division.

1 point

Task 2 (2 pts): Briefly explain the difference between .ascii and .asciz directives.

Look at the attached picture: which of the following orders of directives correspond to the given order of characters in memory (assume the Big-Endian byte ordering):

(a)

.data

.ascii "Hello"

.asciz "Hello"

(b)

.data

.asciz "Hello"

.ascii "Hello"

2 points

Task 3 (1 pt): Take a look at the macro `print_val_int(%val)`, defined in the attached picture. As you can see, it is devoted to printing the integer immediate value `val`. Which line of code should be changed and how, so that the given macro will now print the value of `%val` in binary format?

1 point

Task 4 (1 pt): Let's imagine that we are executing some program on RISC-V, and the Program Counter (PC) is currently set to 0xDEADBEEF, i.e. the address of the first executed base-type (4 byte-long) instruction. After the first instruction execution is completed, and we switch to the execution of the very next instruction, the stored value of PC becomes ..?🤔

1 point

Uh, maybe 0xTASTYBEEF? I dunno, I actually just want to have a break already 🍽

I guess, 0xDEADFFF3 is the new value, PC stores

My assumption is that the PC now points to 0xDEADBEF3

I am sure, it turns to 0xFFFFFFFF

Oh, I know, I know! The new address, PC points to is 0xDEADB33F

Clear selection

Task 5 (1 pt): Does the following RISC-V assembly program result in a dead loop? (assume that the x5 register is initially 0)

1 point

My assumption is that it doesn't

Oh, it actually won't execute at all! It contains an error!

Well, I guess, it does

Clear selection

Task 6 (1 pt): Write a single-line macro (name it AND56) for the operation of: x6 = x5 & x6 (bitwise "and"), using .eqv directive.

1 point

Task 7 (1 pt): Select the option, in which all of the defined instruction types (formats) are correctly specified.

1 point

4️⃣

3️⃣

2️⃣

1️⃣

Clear selection

Task 8 (1 pt): Which of the following statements about branch instructions are NOT true?

1 point

Unsigned branch instructions cannot be used to create nested loops

Branch instructions add a 12-bit signed immediate to PC (Program counter)

A branch instruction cannot be an unconditional branch, as branching decision has to necessarily be taken based upon some condition

blt, bgtz, blez are all assuming strict inequalities (<, > rather than <= or >=) when branching

Branch instructions are PC-relative

Task 9 (1 pt): Will `muli x5, x5, 16` instruction work? Provide a valid instruction (or sequence of instructions) which will result in the desired value of `x5` register, if you think that the given instruction is invalid. Briefly explain your answer.

1 point

✨BONUS✨ (1 bp) : Feedback! How do you find this quiz? Is there anything to improve (in general)? Feel free to suggest some cool stuff to implement :)

0 points

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