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arXiv · 2010.03993

The Improved GP 2 Compiler

Graham Campbell·Jack Romo·Detlef Plump
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Abstract

GP 2 is a rule-based programming language based on graph transformation rules which aims to facilitate program analysis and verification. Writing efficient programs in such a language is challenging because graph matching is expensive. GP 2 addresses this problem by providing rooted rules which, under mild conditions, can be matched in constant time. Recently, we implemented a number of changes to Bak's GP 2-to-C compiler in order to speed up graph programs. One key improvement is a new data structure for dynamic arrays called BigArray. This is an array of pointers to arrays of entries, successively doubling in size. To demonstrate the speed-up achievable with the new implementation, we present a reduction program for recognising binary DAGs which previously ran in quadratic time but now runs in linear time when compiled with the new compiler.

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Graham Campbell, Jack Romo, Detlef Plump. 2020-10-06. The Improved GP 2 Compiler. https://arxiv.org/abs/2010.03993

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