stream-fusion

Faster Haskell lists using stream fusion http://hackage.haskell.org/trac/ghc/ticket/915

Latest on Hackage:0.1.2.5

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BSD3 licensed by Duncan Coutts, Don Stewart
Stream fusible lists

Faster lists using stream fusion.

The abstract from the paper:

This paper presents an automatic deforestation system, \emph{stream
fusion}, based on equational transformations, that fuses a wider
range of functions than existing short-cut fusion systems. In
particular, stream fusion is able to fuse zips, left folds and
functions over nested lists, including list comprehensions. A
distinguishing feature of the framework is its simplicity: by
transforming list functions to expose their structure, intermediate
values are eliminated by general purpose compiler optimisations.

We have reimplemented the Haskell standard List library on top of
our framework, providing stream fusion for Haskell lists. By
allowing a wider range of functions to fuse, we see an increase in
the number of occurrences of fusion in typical Haskell programs. We
present benchmarks documenting time and space improvements.

Building:

$ runhaskell Setup.lhs configure --prefix=/home/dons
$ runhaskell Setup.lhs build
$ runhaskell Setup.lhs install

Use:

import Data.List.Stream

and use as you would for normal lists.
Compile with ghc -O2 for best results.
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