fastlog2

Library "fastlog2"

Description:
Returns the approximation of Log2 with the maximal error of: 0.000061011436

Reference:
anycodings.com/1questions/2553538/efficient-implementation-of-natural-logarithm-ln-and-exponentiation

fastlog2(x)
  Returns the approximation of Log2 with the maximal error of: 0.000061011436
  Parameters:
    x: float
  Returns: float, log2 of x