3. We want to code a single instruction that

inverts bits 5 and 6 in BL without changing any

other bits. Which of the following does the job?

(a) XOR bl,60h

(b) OR bl,60h

(c) AND bl,60h

(d) ADD bl,60h

W e w a n t t o c o d e

a single instruction that

inverts bits 5 and 6 in BL without changing any

other bits. Which of the following does the job?

(a)

XOR bl,60h

(b)

OR bl,60h

(c)

AND bl,60h

(d)

ADD bl,60h

4.

G i v e n t h e f o l l o w i n g

H i g h L e v e l

L a n g u a g e s t a t e m e n t s .

M a i n ( )

{

I n t a = 1 4

;

I n t b = 3 0

;

S U B T ( a , b )

}

S U B T ( i n t x , i n t y )

{

R e t u r n ( y

-

x)

}

A s s u m e t h a t p a r a m e t e r s a r e p a s s e d o n

t o

t h e

s t a c k a n d t h e c a l l e e ( C a l l e d p r o g r a m )

c l e a n s t h e s t a c k . W

r i t e t h e c o d e f o r

S U B T

w h e n i t i s c o m p i l e d i n t o A s s e m b l y

L a n g u a g e

.

H I N T : D r a w t h e S t a c k F r a m e

f i r s t t o s e e h o w i t l o o k s l i k e .