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Statically Unrolling Recursion to Improve Opportunities for Parallelism

Deshpande, Neil Ashish; Edwards, Stephen A.

We present an algorithm for unrolling recursion in the Haskell functional language. Adapted from a similar algorithm proposed by Rugina and Rinard for imperative languages, it essentially inlines a function in itself as many times as requested. This algorithm aims to increase the available parallelism in recursive functions, with an eye toward its eventual application in a Haskell-to-hardware compiler. We first illustrate the technique on a series of examples, then describe the algorithm, and finally show its Haskell source, which operates as a plug-in for the Glasgow Haskell Compiler.

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Academic Units
Computer Science
Publisher
Department of Computer Science, Columbia University
Series
Columbia University Computer Science Technical Reports, CUCS-011-12
Published Here
July 26, 2012