Bitwise Operations

Question 1

ands and its alias

Answer 1

sets or clears N and Z flags according to the result
tst is an alias for ands stored in xzr

Question 2

The use of bitmasking

Answer 2

Setting certain bits in a number

Question 3

Bit Clear’s logical equivalent

Answer 3

AND NOT

Question 4

Alias of mvn

Answer 4

orn with xzr

Question 5

Logical Shift Left

Answer 5

0 is shifted into rightmost bit
Shifted out bits are lost

Question 6

Logical Shift right

Answer 6

0 is shifted into leftmost bit
Shifted out bits are lost

Question 7

(T/F)LSR is division by power of two and LSL is multiplication by power of two

Answer 7

TRUE

Question 8

Arithmetic Shift RIght

Answer 8

Sign bit is duplicated when shifting
Preserves sign when dividing by power of two

Question 9

Rotate Right

Answer 9

Bits shifted out on the right are inserted on the left

Question 10

Sign Extend Byte(sxtb)

Answer 10

Sign extends bit 7 into bits 8-31

Question 11

Sign extend Halfword(sxth)

Answer 11

Sign-extends bit 15 to bits 16-31

Question 12

Signed extend word(sxtw)

Answer 12

sign extends bit 31 into bits 32-63

Question 13

Unsigned extend byts(uxtb)

Answer 13

Zero-extends bits 8-31

Question 14

Unsigned Extend Halfword(uxth)

Answer 14

Zero-extends bits 16-31