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  21 
  22 LOOP INVARIANT COMPUTATIONS
  23 
  24 Loop-invariant is any part of a computation within a loop that does not depend
  25 on the loop variables and whose value does not change as long as control stays
  26 within the loop. Loop-invarians assignments may be moved out of the loop
  27 entirely. There may be some situations where you know the value won't vary, but
  28 the compiler is playing it safe in case of side-effects. "Computation" here
  29 doesn't mean just arithmetic; array indexing, calls to pure functions are all
  30 possible candidates for moving out of the loop.