Question

# Question 2 for HW 3 use MPLAB IDE
# Your solution should implement the following loop:
#   for (i = 0; i < X; i++) {
#       A = A + X;
#       B = B - X;
#       if (A == B)
#           break;        ## break exits loop early
#   }

        
    .global    main
    .data

### THESE VARIABLES ARE SIMPLY GIVEN VALUES TO START
###   WITH--CHANGE THEIR VALUES AND VERIFY YOUR PROGRAM
###   WORKS APPROPRIATELY IN ALL CASES
A:  .int    1
B:  .int    100
X:  .int    20
        
    .text
    .set       noreorder
    .ent       main

main:
    # Load variables into registers
    lw  $t0, A
    lw  $t1, B
    lw  $t2, X
    
    # Implement loop described above
    # Make sure final values for A and B are in memory
    #   (but you don't necessarily have to update memory
    #    in every loop iteration)
        
# This code simply loops infinitely
spin:   
    j          spin
    nop

    .end        main 

Answer 1

Tge required code is as below

        
    .global    main
    .data

### THESE VARIABLES ARE SIMPLY GIVEN VALUES TO START
###   WITH--CHANGE THEIR VALUES AND VERIFY YOUR PROGRAM
###   WORKS APPROPRIATELY IN ALL CASES
A:  .int    1
B:  .int    100
X:  .int    20
        
    .text
    .set       noreorder
    .ent       main

main:
    # Load variables into registers
    lw  $t0, A

    lw  $t1, B

    lw  $t2, X 

move $t3,$0  #i =0

    l1: bge $t3,$t2,done  # for condition
        
      add $t0,$t0,$t2  # A =A+X
       sub $t1,$t1,$t2  #B =B-X 
       beq $t0,$t1,done # if A=B exit for
       addi $t3,$t3,1  #i++ 

    j          l1
​​​​

    nop
done:

# store variables from registers

sw $t0, A

sw $t1, B

sw $t2, X

   
    .end        main