Below is an example code Only touch the matrix mul subroutine to write a code that multiplies two n n matrices text global main set LED BASE, 0 x 4 1 2 1 0 0 0 0 set SSD BASE, 0 x 4 3 C 1 0 0 0 0 set C ZERO, 0 x 0 0 0 0 0 0 0 0 set MATRIX N , 3 R 1 2 ( n ) main BL init LED turn off all the LEDs BL disable 7 seg turn it off BL init var R 1 2 has n You can use it as a global variable to get n BL LED 0 0 0 1 turn on the rightmost LED BL init matrix B matrix mul you should implement this subroutine main done B check answer check answer done B matrix end matrix mul R 0 R 1 1 , R 1 4 are available Don't touch R 1 2 , R 1 5 Place the results in the stack See the slides B main done init LED LDR R 0 , LED BASE MOV R 1 , 0 STR R 1 , R 0 BX LR LED 0 0 0 1 LDR R 0 , LED BASE MOV R 1 , 1 STR R 1 , R 0 BX LR LED 1 0 0 1 wrong LDR R 0 , LED BASE MOV R 1 , 9 STR R 1 , R 0 BX LR LED 1 1 1 1 correct LDR R 0 , LED BASE MOV R 1 , 1 5 STR R 1 , R 0 BX LR init var LDR R 0 , C ZERO LDR R 1 , C ZERO LDR R 2 , C ZERO LDR R 3 , C ZERO LDR R 4 , C ZERO LDR R 5 , C ZERO LDR R 6 , C ZERO LDR R 7 , C ZERO LDR R 8 , C ZERO LDR R 9 , C ZERO LDR R 1 0 , C ZERO LDR R 1 1 , C ZERO LDR R 1 2 , MATRIX N BX LR disable 7 seg LDR R 0 , SSD BASE MOV R 1 , 0 x 0 0 STR R 1 , R 0 BX LR init matrix LDR R 0 , C ZERO LDR R 1 , C ZERO LDR R 2 , C ZERO MOV R 0 , 2 MOV R 1 , 3 MOV R 2 , 4 PUSH R 0 PUSH R 1 PUSH R 2 MOV R 0 , 5 MOV R 1 , 6 MOV R 2 , 7 PUSH R 0 PUSH R 1 PUSH R 2 MOV R 0 , 1 MOV R 1 , 3 MOV R 2 , 5 PUSH R 0 PUSH R 1 PUSH R 2 MOV R 0 , 4 MOV R 1 , 6 MOV R 2 , 8 PUSH R 0 PUSH R 1 PUSH R 2 MOV R 0 , 2 MOV R 1 , 3 MOV R 2 , 7 PUSH R 0 PUSH R 1 PUSH R 2 MOV R 0 , 2 MOV R 1 , 7 MOV R 2 , 5 PUSH R 0 PUSH R 1 PUSH R 2 BX LR check answer LDR R 0 , SP , 3 2 CMP R 0 , 2 2 BNE wrong answer LDR R 0 , SP , 2 8 CMP R 0 , 4 9 BNE wrong answer LDR R 0 , SP , 2 4 CMP R 0 , 5 7 BNE wrong answer LDR R 0 , SP , 2 0 CMP R 0 , 4 6 BNE wrong answer LDR R 0 , SP , 1 6 CMP R 0 , 9 7 BNE wrong answer LDR R 0 , SP , 1 2 CMP R 0 , 1 1 7 BNE wrong answer LDR R 0 , SP , 8 CMP R 0 , 2 0 BNE wrong answer LDR R 0 , SP , 4 CMP R 0 , 5 0 BNE wrong answer LDR R 0 , SP CMP R 0 , 5 4 BNE wrong answer B correct answer correct answer BL LED 1 1 1 1 B check answer done wrong answer BL LED 1 0 0 1 B check answer done matrix end end

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Question: Below is an example code. Only touch the matrix _ mul subroutine to write a code that multiplies two n * n matrices. . text

Below is an example code. Only touch the "matrix

_

mul" subroutine to write a code that multiplies two n

*

n matrices.

.

text

.

global main

.

set LED

_

BASE,

0

41210000

.

set SSD

_

BASE,

0

43

10000

.

set C

_

ZERO,

0

00000000

.

set MATRIX

_

, 3

/ /

12 (

)

main:

BL init

_

LED

/ /

turn off all the LEDs.

BL disable

_7

seg

/ /

turn it off.

BL init

_

var

/ /

12

has n

.

You can use it as a global variable to get n

.

BL LED

_0001 / /

turn on the rightmost LED.

BL init

_

matrix

B matrix

_

mul

/ /

you should implement this subroutine.

main

_

done:

B check

_

answer

check

_

answer

_

done:

B matrix

_

end

matrix

_

mul:

/ /

0

~ R

11,

14

are available. Don't touch R

12,

15 .

Place the results in the stack. See the slides.

B main

_

done

init

_

LED:

LDR R

0, =

LED

_

BASE

MOV R

1,

0

STR R

1, [

0]

BX LR

LED

_0001

LDR R

0, =

LED

_

BASE

MOV R

1,

1

STR R

1, [

0]

BX LR

LED

_1001

/ /

wrong

LDR R

0, =

LED

_

BASE

MOV R

1,

9

STR R

1, [

0]

BX LR

LED

_1111

/ /

correct

LDR R

0, =

LED

_

BASE

MOV R

1,

15

STR R

1, [

0]

BX LR

init

_

var:

LDR R

0, =

_

ZERO

LDR R

1, =

_

ZERO

LDR R

2, =

_

ZERO

LDR R

3, =

_

ZERO

LDR R

4, =

_

ZERO

LDR R

5, =

_

ZERO

LDR R

6, =

_

ZERO

LDR R

7, =

_

ZERO

LDR R

8, =

_

ZERO

LDR R

9, =

_

ZERO

LDR R

10, =

_

ZERO

LDR R

11, =

_

ZERO

LDR R

12, =

MATRIX

_

BX LR

disable

_7

seg:

LDR R

0, =

SSD

_

BASE

MOV R

1,

0

00

STR R

1, [

0]

BX LR

init

_

matrix:

LDR R

0, =

_

ZERO

LDR R

1, =

_

ZERO

LDR R

2, =

_

ZERO

MOV R

0,

2

MOV R

1,

3

MOV R

2,

4

PUSH

{

0}

PUSH

{

1}

PUSH

{

2}

MOV R

0,

5

MOV R

1,

6

MOV R

2,

7

PUSH

{

0}

PUSH

{

1}

PUSH

{

2}

MOV R

0,

1

MOV R

1,

3

MOV R

2,

5

PUSH

{

0}

PUSH

{

1}

PUSH

{

2}

MOV R

0,

4

MOV R

1,

6

MOV R

2,

8

PUSH

{

0}

PUSH

{

1}

PUSH

{

2}

MOV R

0,

2

MOV R

1,

3

MOV R

2,

7

PUSH

{

0}

PUSH

{

1}

PUSH

{

2}

MOV R

0,

2

MOV R

1,

7

MOV R

2,

5

PUSH

{

0}

PUSH

{

1}

PUSH

{

2}

BX LR

check

_

answer:

LDR R

0, [

,

32]

CMP R

0,

22

BNE wrong

_

answer

LDR R

0, [

,

28]

CMP R

0,

49

BNE wrong

_

answer

LDR R

0, [

,

24]

CMP R

0,

57

BNE wrong

_

answer

LDR R

0, [

,

20]

CMP R

0,

46

BNE wrong

_

answer

LDR R

0, [

,

16]

CMP R

0,

97

BNE wrong

_

answer

LDR R

0, [

,

12]

CMP R

0,

117

BNE wrong

_

answer

LDR R

0, [

,

8]

CMP R

0,

20

BNE wrong

_

answer

LDR R

0, [

,

4]

CMP R

0,

50

BNE wrong

_

answer

LDR R

0, [

]

CMP R

0,

54

BNE wrong

_

answer

B correct

_

answer

correct

_

answer:

BL LED

_1111

B check

_

answer

_

done

wrong

_

answer:

BL LED

_1001

B check

_

answer

_

done

matrix

_

end:

.

end

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