Using any of the assembly language instructions shown in Figure 6.5, translate t

Question

Using any of the assembly language instructions shown in Figure 6.5, translate the following algorithmic operations into assembly language code. Show all necessary .DATA pseudo-ops. You may put in whatever initial values you want for a, b, c, and n.

A) Set a to the value of (c + 1) (b c)

B) if b < 0 then Set c to the value of 1 Set c to the value of c + c

C) Set c to the value of 0 for a = 1 to n do if a < 6 then Set c to the value of c + a else Set c to the value of c a Set c to the value of c b

FIGURE 6.5 Binary Op CodeOperation Meaning CON(X) R R-CON(X) 0-CON(X) 0001 0010 0011 0100 0101 0110 0111 LOADX STORE X CLEARX ADD X INCREMENT X SUBTRACTX DECREMENT X COMPAREX CON(X) + 1 CON(X) R-CON(X) R if CONX)>R then GT-1 ese0 ifCOn(X) = R then EQ 1 else 0 1000 1001 1010 1011 1100 1101 JUMP X JUMPGT X JUMPEQX JUMPLT X JUMPNEQX Get the next instruction from memory ocationX Get the next instruction from memory location X if G-1 Get the next instruction from memory location X if EQ 1 Get the next instruction from memory location X if LT 1 Get the next instruction from memory location X if EQ 0 Input an integervalue from the standard input device and store into memory cell X Output, in decimal notation, the value stored in memory cell X Stop program execution. INX 1110 OUT X

Explanation / Answer

1.

.data

a DB 0

b DB 4

c DB 10

.code

LOAD b, r1

LOAD c,r2

SUBTACT r1,r2 ; b = b-c

ADD r2,1 ; c=c+1

SUBTACT r2,r1 ; c = c+1 - (b-c)

STORE r2,a ; store result in a

2.

.data

b DB 100

c DB 10

.code

LOAD b,r1

COMPARE r1,0

JUMPLT LT

JUMP GE

LT:

STORE -1,c

JUMP EXIT

GE:

ADD c,c

EXIT:

3.

.data

a DB 0

b DB 4

c DB 10

n DB 5

.code

STORE 0,c ; set c to 0

;now iterate from 1 to n

LOOP:

COMPARE a,n ; loop exit condition

JUMPGT EXIT ; if a>n then jump to EXIT

COMPARE a,6

JUMPLT LT

JUMP GE

LT:

ADD c,a ; c = c+a

ADD a,1 ; increment a

JUMP LOOP

GE:

SUBTACT c,a ; c=c-a

ADD a,1 ; increment a

JUMP LOOP

EXIT:

SUBTACT c,b ; set c to c-b

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