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Galois Tech Talk: Don Stewart, "Stream Fusion for Haskell Arrays"

Galois, Inc
421 SW 6th Ave. Suite 300
Portland, OR 97204, US (map)



Just a quick note about next week's Galois Tech Talk. Now that Galois has completed its move into downtown Portland, and a shiny new, centrally located, office space, we're opening up our tech talk series a bit more widely. If you're in Portland, and interested in functional programming and formal methods, drop by!

TITLE: Stream Fusion for Haskell Arrays

speaker: Don Stewart DATE: Tuesday, July 15th, 10.30am sharp.

Galois, Inc. 421 SW 6th Ave. Suite 300 (3rd floor of the Commonwealth Building) Portland, Oregon


Arrays have traditionally been an awkward data structure for Haskell programmers. Despite the large number of array libraries available, they have remained relatively awkward to use in comparison to the rich suite of purely functional data structures, such as fingertrees or finite maps. Arrays have simply not been first class citizens in the language.

In this talk we'll begin with a survey of the more than a dozen array types available, including some new matrix libraries developed in the past year. I'll then describe a new efficient, pure, and flexible array library for Haskell with a list like interface, based on work in the Data Parallel Haskell project, that employs stream fusion to dramatically reduce the cost of pure arrays. The implementation will be presented from the ground up, along with a discussion of the entire compilation process of the library, from source to assembly.


Galois (http://galois.com) has been holding weekly technical seminars for several years on topics from functional programming, formal methods, compiler and language design, to cryptography, and operating system construction, with talks by many figures from the programming language and formal methods communities.

The talks are open and free. If you're planning to attend, dropping a note to [email protected] is appreciated, but not required. If you're interested in giving a talk, Don's always looking for new speakers.