Question

Assembly Language

homework assignment has 2 parts which require 2 separate programs. Submit both source

code files .

Question 1 of 2. Integer arithmetic: [20 marks] Write an assembly language program that performs the following arithmetic operation on 4 integer numbers.

?????? = ((2∗?)+? )/(?+?)

1. Reserve memory for 4 integers and initialize them to numbers of your choice.

2. Reserve 4 bytes of memory for a single integer to store the result of the operation in a

READWRITE section of memory.

3. Load the numbers from memory and perform the above operation.

4. Store the result back into of memory.

For this part of the assignment, we shall work with 4 integers namely A, B, C, D. We can declare them as 4 separate variables or a single array with 4 numbers. We need to MULtiply the number A with 2 and then ADD the result to B. We also need to ADD C and D together to get the divisor. Following this we need to perform Signed DIVision of the two intermediate results in order to obtain the final result. This is an integer arithmetic operation, so division would not give you a floating-point result. All remainders are ignored. Division with a number higher than the dividend would result in 0. This follows traditional integer division as in C++.

Make sure your code works for any input number, not just the test cases. Your code will be tested on other test cases not listed here.

Please properly comment your code before submission.

Answer 1

.data
   #Declaring and Initializing A,B,C and D variables
   A:   .word   20
   B:   .word   24
   C:   .word   12
   D:   .word   4
   #Reserving space of 4 bytes to store the result of the operation
   result:   .space   4
   prompt:   .asciiz   "\nThe result is: "
  
.text
main:
   #Loading A,B,C and D variables from memory
   lw $t0,A
   lw $t1,B
   lw $t2,C
   lw $t3,D
      
   mul $t4,$t0,2           #Multiplying A by 2
   add $t4,$t4,$t1           #Adding B to the result in above operation
   add $t5,$t2,$t3           #Adding C and D variables
   div $t6,$t4,$t5           #Dividing ((2*A)+B) by (C+D)
  
   sw $t6,result           #Storing result into memory
  
   #Displaying the result to user
   li $v0,4
   la $a0,prompt
   syscall  
   li $v0,1
   move $a0,$t6
   syscall