CS501 Advance Computer Architecture Assignment 1 solution Fall 3rd November 2012

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CS501 Advance Computer Architecture Assignment 1 solution Fall 3rd November 2012





Q1. Write an SRC assembly language program to evaluate the following expression:

f = 4(k+32) + 16(g-h)

Note that your code should not change the source operands and also keep in mind that the SRC does not have a multiply instruction

Part b: 5 marks

Draw memory map table for the above program using the following scenario and assume that SRC uses 16-bit memory in this case.

.ORG 300 ; start the next line at address 300

k: .DW 1 ;

g: .DW 1 ;

h: .DW 1 ;

f: .DW 1 ;

;

.ORG 400 ; start the code at address 400

The code starts at address 400 and each instruction takes 16-bits in the memory.

Solution:

Write an SRC assembly language program to evaluate the following expression:

f = 4(k+32) + 16(g-h)

Note that your code should not change the source operands and also keep in mind that the SRC does not have a multiply instruction

Solution

ld R1,g

ld R3,h

sub R5,R3,R1

shl R4,R5,4

addi R7,R6,32

shl R8,R7,2

add R9,R8,R4

st R9,f

Part b: 5 marks

Draw memory map table for the above program using the following scenario and assume that SRC uses 16-bit memory in this case.



.ORG 300 ; start the next line at address 300

k: .DW 1 ;

g: .DW 1 ;

h: .DW 1 ;

f: .DW 1 ;

;



.ORG 400 ; start the code at address 400

The code starts at address 400 and each instruction takes 16-bits in the memory.



Solution

Memory Map

Memory Address
Memory Contents

300
unknown

304
unknown

308
unknown

312
unknown

…..


400
ld R1,g

402
ld R3,h

404
sub R4,R3,R1

406
shl R4,R5,4

408
addi R7,R6,32

410
shl R8,R7,2

412
add R9,R8,R4

414
st R9f