ROHD-HCL implements a set of one hot encoder and decoders.
For example, we have an encoder BinaryToOneHot class, and a couple of implementations of decoder classes like CaseOneHotToBinary and a more performant TreeBinaryToOneHot. The OneHotToBinary default constructor will select an implementation based on the width of the input.
The encoders take a Logic bit-vector, with the constraint that only a single bit is set to '1' and outputs the bit position in binary.
The decoders take a Logic input representing the bit position to be set to '1', and returns a Logic bit-vector with that bit position set to '1', and all others set to '0'