ROHD HCL comes with a Count component. The detailed API docs are available here.
A Count will count all one(1)/zero(0) within a given Logic bus.
It takes a binary Logic bus and counts all one or zero within the bus. A Count function without any constructor arguments will only count all Ones (1).
That is to say, by default a Count will go for counting with a countOne which is set as true by default.
The boolean countOne is optional. Only Logic bus is mandatory argument.
This will return a Logic value labeled as countOne for 1 and countZero for 0. The value is a result of count of all occurrence parsed (with countOne as 1 or 0) through the entire Logic bus.
To count all ones just pass in the bus with countOne as true. By default countOne is true.
To count all zeros just pass in the bus with countOne as false.