# Example of passing an array into a function

main:
    #prolog
    push $ra

    la  $a0, array          #v0 = sumOf(array,10);
    li  $a1, 10
    jal sumOf

    move $a0, $v0           #printf("%d",v0);
    li $v0, 1
    syscall
                

    li $v0, 0
    #epilog
    pop $ra
    jr $ra

#int sumOf(int a[], int n)
#{
#   int i;  int sum = 0;
#   for (i = 0; i < n; i++) sum += a[i];
#   return sum;
#}

#int sumOf(int a[], int n)
#{
#   int i = 0;  
#   int sum = 0;
#   
# for:
#   if i >= n goto end_for
#   sum = sum + a[i];
#   i = i + 1;
#   goto for
# end_for
#   return sum;
#}

sumOf:
    #prolog
    push $ra
 
    li      $t0, 0              #$t0 is i; i = 0
    li      $t1, 0              #$t0 is sum; sum = 0;
    li      $t2, 4              #$t0 is sizeof(int)
for:
    bge     $t0, $a1, end_for   #if i >= n goto end_for
    
    mul     $t3, $t0, $t2       #offset = i * 4
    
    add     $t4, $a0, $t3       #t4 = address of a + offset
    lw      $v0, ($t4)          #$v0 = a[i]
    add     $t1, $t1, $v0       #sum = sum + a[i]
    addi    $t0, $t0, 1         # i = i + 1
    j       for                 #goto for
end_for:
    move    $v0, $t1            #set return value
    #epilog
    pop     $ra
    jr      $ra
    
   .data
array:
    .word 5, 4, 7, 6, 8, 9, 1, 2, 3, 0