21. Using registers

• 
       # Instruction    # Meaning in pseudocode
  
       # copy register:
       move $t1, $t2    # $t1 = $t2
  
       # load immediate: load constant into register (16-bit)
       li $t1, 42       # $t1 = 42
       li $t1, 'k'      # $t1 = 0x6B
  
       # load address into register
       la $t1, label    # $t1 = label