• The numbers will be passed into the procedure in $a0, $a1, $a2, $a3.
• Your procedure should return the numbers in order on the stack, such that the lowest number is at the lowest point on the stack (the last value pushed on).
• Make sure that you do not destroy values in registers that the caller expects to remain in tact.

The following algorithm outline may be useful:

• Push on stack any information that you will change and the caller expects will remain in tact.
• $t0 = maximum of $a0,$a1,$a2,$a3
• t0 = maximum of $a0 and $a1
  $t4 = minimum of $a0 and $a1
• t0 = maximum of $t0 and $a2
  $t5 = minimum of $t0 and $a2
• t0 = maximum of $t0 and $a3
  $t6 = minimum of $t0 and $a3
• $t1 = maximum of $t4, $t5, $t6
• t1 = maximum of $t4 and $t5
  $t4 = minimum of $t4 and $t5
• t1 = maximum of $t1 and $t6
  $t5 = minimum of $t1 and $t6
• $t2 = maximum of $t4, $t5
• $t3 = minimum of $t4, $t5
• Pop off stack any information pushed on at the start of the procedure.
• Push sorted values onto stack.
• Return.