Topic 9 theory

Question 1

Types of operations

Answer 1

Data transfer, Arithmetic, Logical, transfer of control

Question 2

What is required when performing data transfer

Answer 2

Location of source and operands, Length of data must be indicated, addressing mode to be used

Question 3

What are arithmetic shifts used for

Answer 3

Efficient ways to perform multiplication or division of signed integers by powers of two

Question 4

Memory alignment

Answer 4

Data in memory is byte-level accessible, bus controller only accepts starting address that are multiples of 4. otherwise, misalignment

Question 5

Clear bits by a mask

Answer 5

use 0 and AND operator

Question 6

Set bits by a mask

Answer 6

use 1 and ORR operator

Question 7

Invert bits by a mask

Answer 7

use 1 and XOR operator

Question 8

Rotate left in ARM

Answer 8

use Rotate right = 32 - rotate left