Day 4

Question 1

Let r1 be holding some number x .

Save in r2 the remainder of the division of x by 8.

Answer 1

andi r2, r1, 7

Question 2

How can you multiply two numbers x and y?

Answer 2

Question 3

What is the idea behind counting the number of ones in a number?

Answer 3

perform shl 32 times, if the number is negative - increase the counter of ones.

Question 4

what is the idea behind moving through an array of 2048 number and changing them to their absolute values?

Answer 4

• set register to 2048 and decrease it by 1 with every iteration. stop in zero.
• if the number is positive: brpl, go to the next iteration
• else, perform the neg instruction.