Co-dfns

Co-dfns is a compiler for a subset of Dyalog APL developed by Aaron Hsu, designed to target and run on GPUs. The implementation is notable for its use of vectors to represent trees. While the implementation is extremely terse and largly uncommented, the code is described in detail in Hsu's doctors thesis, wherein he also claims that the performance and maintainability of the compiler could not be achieved with any language other than APL.