# void swap( int array[], int from, int to) {
#   int temp;
#   temp = array[from];
#   array[from] = array[ to];
#   array[to] = temp;
# }

.data
array1:   .space 20  # 20 bytes which is five ints
array2:   .space 20  # 20 bytes
array3:   .word 5, 6, 7, 8, -1

.text
main:
  la    $a0, array3
  addi  $a1, $zero, 1
  addi  $a2, $zero, 2
  jal   swap
  nop
  j     end
# Assume that array address is in $a0, from in $a1, and to in $a2
# Since this is a leaf method, we dont worry about the stack.
swap:
  sll   $t0, $a1, 2       # from * 4 in t0
  sll   $t1, $a2, 2       # to * 4 in t1
  add   $t2, $a0, $t0     # Address of array[from] in $t2
  add   $t3, $a0, $t1     # Address of array[ to] in $t3
  lw    $t4, 0($t2)       # Value of array[from] into $t4
  lw    $t5, 0($t3)       # Value of array[to] into $t5
  sw    $t4, 0($t3)       # Value from $t4 into array[to]
  sw    $t5, 0($t2)       # Value from $t5 into array[from]
  jr    $ra
end:
  nop