|Version 5 (modified by chak, 10 years ago) (diff)|
Closure conversion as part of vectorisation
TODO Describe the treatment of higher-order functions and closure conversion here. The relevant paper is http://www.cse.unsw.edu.au/~chak/papers/LCK06.html. The approach is described in more detail in http://opus.kobv.de/tuberlin/volltexte/2006/1286/.
Closure-converted types as indexed-types
One option for implementing closure-conversion is to represent closure-converted types as an indexed type whose type index is the original type and to combine that indexed type in a type class with methods for converting between closure-converted and vanilla terms. The details are under indexed closure conversion. There are two potential benefits for this approach: (1) we will probably have to do something similar for vectorisation anyway - see the requirements of vectorisation? - and (2) it seems that we need less bookkeeping (e.g., the name of a closure converted data type is just the indexed type with the original data type as its index). However, there are problems, too; in particular, as we currently don't have class contexts and polytypes as type indexes.
From the Skype discussion, 16 Mar 07
For each function f::ty, create a closure-converted function fc::ty', where ty' is the closure-converted verion of ty. Optimisation: make fc=f, if the code for fc will be identical to that of f.
For each data type T, create a closure-converted data type Tc, whose constructors use Clo instead of ->. Optimisation: if Tc is identical to T, don't create a new data type.