19. Integer Multiplication

• Result of multiplication is a 64-bit number, stored in two 32-bit registers named "hi" and "lo"

  
       # Instruction      # Meaning in pseudocode
       mult $t1, $t2      # hi,lo = $t1 * $t2
       mflo $t0           # $t0 = lo
       mfhi $t3           # $t3 = hi
  
  

• There is a shortcut (macro instruction):

  
       mul $t0, $t1, $t2  # hi,lo = $t1 * $t2; $t0 = lo
  
  

  which expands to:

  
       mult $t1, $t2
       mflo $t0