object log2Up

Compute the log2 of a Scala integer, rounded up, with min value of 1. Useful for getting the number of bits needed to represent some number of states (in - 1), To get the number of bits needed to represent some number n, use log2Up(n + 1). with the minimum value preventing the creation of currently-unsupported zero-width wires.

Note: prefer to use log2Ceil when in is known to be > 1 (where log2Ceil(in) > 0). This will be deprecated when zero-width wires is supported.

Source
Math.scala
Example:

  1. log2Up(1)  // returns 1
log2Up(2)  // returns 1
log2Up(3)  // returns 2
log2Up(4)  // returns 2
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