Bitwise Operations

Question 1

What do bitwise logical instructions do?

Answer 1

They manipulate one or more bits in a register

Question 2

AND Truth Table

Answer 2

Insert

Question 3

What does a bitmask do?

Answer 3

It “masks out” all bits except where it has 0s e.g. insert

Question 4

Which forms exist for AND

Answer 4

64-bit/32-bit/immediate

Question 5

What flags does ands set or clear?

Answer 5

N and Z flags (V and C are always cleared)

Question 6

What is an alias for ands?

Answer 6

tst is an alias for ands

tst Xn, Xm
ands zxr, Xn, Xm

Question 7

Incusive OR Truth Table (orr)

Answer 7

Question 8

Which forms exist for ORR

Answer 8

32/64/imediate

Question 9

ORR can be used to ___ bits

Answer 9

set

Question 10

What is an alias for orr?

Answer 10

mov is an alias for orr

mov Xd, Xm
orr Xd, xzr, Xm

Question 11

EOR Truth Table

Answer 11

Question 12

Which forms exist for EOR

Answer 12

32/64/immediate

Question 13

What is EOR used for?

Answer 13

To toggle bits in a register

Question 14

Bit Clear is the same as _______
and its Truth Table

Answer 14

AND NOT

Question 15

Which forms exits for Bit Clear?

Answer 15

32/64

Question 16

What is Bit Clear used for?

Answer 16

To clear bits

Question 17

OR NOT Truth Table

Answer 17

Question 18

Which forms exist for OR NOT?

Answer 18

32/64

Question 19

NOT Truth Table

Answer 19

Question 20

How is NOT implemented?

Answer 20

Using mo_v_e _N_OT

Question 21

What is mvn an alias for?

Answer 21

For orn

mvn Xd, Xn, Xm
orn Xd, xzr, Xm

Question 22

EOR NOT Truth Table

Answer 22

Question 23

Logical Shift Left

Form

Use

Answer 23

Question 24

_L_ogical _S_hift _R_ight

Form

Use

Answer 24

Question 25

**_A**_rithmetic _**S**_hift _**R_**ight Form What is it called when sign bit is duplicated when shifting? Which one is the sign bit?

Answer 25

Question 26

**_R**_otate _**R_**ight Form Which bits are used?

Answer 26

Question 27

**_S**_igned E_**xt**_end _**B_**yte **_S**_igned E_**xt**_end _**H_**alfword **_S**_igned E_**xt**_end _**W_**ord Form Use

Answer 27

Question 28

**_U_**nsigned E**_xt_**end **B**yte **_U_**nsigned E**_xt_**end **_H_**alfword Form Use

Answer 28

Question 29

**_B_**it**_f_**ield **_I_**nsert Form

Answer 29

Question 30

**_B_**it**_f_**ield **_E_**xtract and Insert **_L_**ow **_U_**nsigned **_B_**it**_f_**ield **_E_**xtract **_S_**igned **_B_**it**_f_**ield **_E_**xtract Form

Answer 30