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We describe a new compiler for Standard ML called TIL, that is based on four technologies: intensional polymorphism, tag-free garbage collection, conventional functional language optimization, and loop optimization. We use intensional polymorphism and tag-free garbage collection to provide specialized representations, even though SML is a polymorphic language. We use conventional functional language optimization to reduce the cost of intensional polymorphism, and loop optimization to generate good code for recursive functions. We present an example of TIL compiling an SML function to machine code, and compare the performance of TIL code against that of a widely used compiler, Standard ML of New Jersey.

We describe a type system and typed semantics that use a hierarchy of monads to describe and delimit a variety of effects, including non-termination, exceptions, and state, in a call-by-value functional language. The type system and semantics can be used to organize and justify avariety of optimizing transformations in the presence of effects. In addition, we describe a simple monad inferencing algorithm that computes the minimum effect for each subexpression of a program, and provides more accurate effects information than local syntactic methods.

. This work presents the Brisk Machine, a machine model for the implementation of functional languages. It is especially designed to be flexible and dynamic, so that it can support a uniform and efficient implementation of multiple paradigms such as computational mobility, dynamic loading and linking, and logic programming. The Brisk Machine is based on the STG Machine, though its model is simplified and adapted so that the various paradigms it supports can be accommodated easily without interference between them. 1 Introduction Many different machine models have been proposed as intermediate forms in the compilation of functional languages, to act as the target of the front end of compilers and as a starting point for code generation. The resulting models tend to be complicated though, partly due to the effort to optimise them in a particular setting. The Brisk 1 Machine has been designed as a target for Haskell compilation which is flexible enough to support a number of different ...