Question

2.  Suppose we have 3 arrays A, B, and C, array A’s base address is in $S3, B’s base address is in $S4, C’s base address is in $S5. You can only use two temporal registers $t0 and $t1. Convert the following code into MIPS assembly language code. Suppose every array element occupies 1 word in MIPS (32 bits).

A[21] = B[0] + C[16];

Answer 1

   lw $t0, ($s4) # t0= B[0]
   #calculate offset and fetch C[16]
   li $t1, 16
   mul $t1, $t1, 4
   add $t1, $t1, $s5
   lw $t1, ($t1) #t1 = C[16]
  
   #add t0 and t1 and store in t0
   add $t0, $t0, $t1
  
   #calculate offset for A[21]
   li $t1, 21
   mul $t1, $t1, 4
   add $t1, $t1, $s3
  
   #store tthe value from t0 into A[21]
   sw $t0, ($t1)