Hoopl: Dataflow Optimization Made Simple by Norman Ramsey, João Dias, and Simon Peyton Jones.
We present Hoopl, a Haskell library that makes it easy for compiler writers to implement program transformations based on dataflow analyses. The compiler writer must identify (a) logical assertions on which the transformation will be based; (b) a representation of such assertions, which should form a lattice of finite height; (c) transfer functions that approximate weakest preconditions or strongest postconditions over the assertions; and (d) rewrite functions whose soundness is justified by the assertions. Hoopl uses the algorithm of Lerner, Grove, and Chambers (2002), which can compose very simple analyses and transformations in a way that achieves the same precision as complex, handwritten ``super-analyses.'' Hoopl will be the workhorse of a new back end for the Glasgow Haskell Compiler (version 6.12, forthcoming).
A continuation of work previously mentioned on LtU here. Original people, new language. More purity, more goodness. Sinfully, there does not yet seem to be a hackage package.