log2

  1. T log2(T val)
  2. T log2(T x)
    version(!LDC && GNU)
    T
    log2
    (
    T
    )
    (
    in T x
    )
    if (
    isFloatingPoint!T
    )
  3. T log2(T x)
  4. T log2(T x)

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