Cinder JIT: Efficient Type Representation Using Bitsets and Semilattices

The Cinder JIT compiler employs a clever type representation, treating types as sets (even lattices) and choosing a compact bitset representation. This article delves into how Cinder leverages bitsets and semilattice structures for efficient type information handling, covering basic type representation, type unions, and specialization. By encoding type information into bitsets, Cinder effectively represents type unions and allows for finer-grained type distinctions. Furthermore, Cinder introduces a specialization mechanism to track the specific value of individual objects, further improving compiler optimization efficiency. The article also discusses the Bottom type and details on generating the type lattice.