[msvalkon]

I don't really understand where the downvotes come from? I find the readability concerns legitimate, and would like to understand why compression algorithm developers feel like this is OK? Is it just the math heavy background? Can't think of any real benefits to this style.

[throwaway2048]

If you don't understand the underlying mathematical algorithms its using, no amount of explicit varible names are going to help you. If you do, the concise structure makes things straightforward. The code is not meant to be read alone and understood, the papers published along with it need to be understood first.

[rimantas]

Exactly. Not all code can be understandable to layman with zero effort.

[dang]

I suspect the downvotes are because code readability is a complex, subtle topic that often gets reduced to flamewars by people who are sure they know ‘the’ right way to do things.

Code readability is relative to the reader, the programming language, and the conventions of a codebase. That's a lot of things to be relative to! Knowing that ought to put speed bumps on the way to dismissing code one isn't familiar with.

I remember having a reaction years ago on seeing some of P.J. Plauger's C++ standard library code. I think I burst out laughing and said I'd fire anyone who wrote code like that for me. Years of subsequent experience have brought multiple layers of understanding how wrong I was.