;
;      CPE 221 Assembly Example
;
;      This program adds a scalar value to all the elements in one
;      array and stores that in another array.
;
;      int main()
;      {
;        const int size = 10;
;        int x[size] = {100, 3, -1, 2, 4, 4, 2, -1, 3, 100};
;        int y[size] = {-53, 247, 95, -7, 481, 91, -33, 1500, 29 -83};
;        int z[size];
;        int i;
;        for (i = 0; i < size; i++)
;          z[i] = x[i] + y[i];
;      }
;
       AREA SUM_ARRAYS, CODE, READONLY
       la    r29, loop
       la    r28, done
       la    r10, array1  ; pointer to first element of array1
       la    r11, array2  ; pointer to first element of array2
       la    r12, array3  ; pointer to first element of array3
       ld    r1, size     ; holds size of arrays
       ld    r2, i        ; holds loop counter
loop:  sub   r3, r2, r1   ; compute i - size
       brpl   r28, r3     ; if i - size >= 0, done
       ld     r3, 0(r10)  ; r3 = array1[i]
       ld     r4, 0(r11)  ; r4 = array2[i]
       add    r4, r4, r3  ; r4 = array1[i] + array2[i]
       st     r4, 0(r12)  ; Store result in array3.
       addi   r10, r10, 4 ; update r10 to point to next element of array1
       addi   r11, r11, 4 ; update r11 to point to next element of array2
       addi   r12, r12,   ; update r12 to point to next element of array3
       addi   r2, r2, 1   ; i++
       br     r29
done:  stop
       END
size:   .dc  10
i:      .dc    0
array1: .dc  100, 3, -1, 2, 4, 4, 2, -1, 3, 100 
array2: .dc  -53, 247, 95, -7, 481, 91, -33, 1500, 29, -83
array3: .dw	10