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Manipulating accumulative functions by swapping call-time and return-time computations*

Part of: JFP Research Articles

Published online by Cambridge University Press:  08 May 2012

AKIMASA MORIHATA ,
KAZUHIKO KAKEHI ,
ZHENJIANG HU  and
MASATO TAKEICHI
AKIMASA MORIHATA
Affiliation:
Tohoku University, Sendai, Japan (e-mail: [email protected])
KAZUHIKO KAKEHI
Affiliation:
University of Tokyo, Tokyo, Japan
ZHENJIANG HU
Affiliation:
National Institute of Informatics, Chiyoda, Tokyo, Japan
MASATO TAKEICHI
Affiliation:
National Institution for Academic Degrees and University Evaluation, Kodaira-shi, Tokyo, Japan
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Abstract

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Functional languages are suitable for transformational developments of programs. However, accumulative functions, or in particular tail-recursive functions, are known to be less suitable for manipulation. In this paper, we propose a program transformation named “IO swapping” that swaps call-time and return-time computations. It moves computations in accumulative parameters to results and thereby enables interesting transformations. We demonstrate effectiveness of IO swapping by several applications: deforestation, higher order removal, program inversion, and manipulation of circular programs.

Type
Articles
Information
Journal of Functional Programming , Volume 22 , Issue 3 , May 2012 , pp. 275 - 299
Copyright
Copyright © Cambridge University Press 2012

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