If your module includes substantial amounts of “C” code, then the task of converting and porting it might be easy, or it might be hard, or it might be next to impossible, depending entirely upon the code.   If you are simply doing “bit-twiddling, very fast,” then the code to do this might have little more to worry its little head about than, “exactly how long is an int?”   But if your code is interacting with the operating system or with some aspect of the external environment, you might be obliged to do things in several different ways, once for each type of environment you intend to support.

I suggest that you begin by carefully defining your problem, your example or examples, and setting appropriate-to-you boundaries around it.   Then, systematically search the prior-art within CPAN (e.g. within the Sys:: modules) that are representative of what you intend to do.   This might not be a task that can be defined “categorically,” nor with too broad of a brush with respect to operating-system platforms.   But useful and recently-maintained examples of prior art do exist.