o

chisel3.util

log2Ceil

object log2Ceil

Compute the log2 of a Scala integer, rounded up. 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 log2Ceil(n + 1).

Note: can return zero, and should not be used in cases where it may generate unsupported zero-width wires.

Source
Math.scala
Example:

  1. log2Ceil(1)  // returns 0
log2Ceil(2)  // returns 1
log2Ceil(3)  // returns 2
log2Ceil(4)  // returns 2
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