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LOOP INVARIANT COMPUTATIONS

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