This page shows all publications that appeared in the IASI annual research reports. Authors currently affiliated with the Institute are always listed with the full name.

You can browse through them using either the links of the following line or those associated with author names.

Show all publications of the year  2001, with author Renault S., in the category IASI Research Reports (or show them all):

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IASI Research Report n. 551    

Alberto Pettorossi, Maurizio Proietti, Renault S.

Derivation of efficient logic programs by specialization and reduction of nondeterminism

ABSTRACT

Program specialization is a program transformation methodology which improves program efficiency by exploiting the information about the input data which are available at compile time. We show that current techniques for program specialization based on partial evaluation do not perform well on nondeterministic logic programs. We then consider a set of transformation rules which extend the ones used for partial evaluation, and we propose a strategy for guiding the application of these extended rules so to derive very efficient specialized programs. The efficiency improvements which sometimes are exponential, are due to the reduction of nondeterminism and to the fact that the computations which are performed by the initial programs in different branches of the computation trees, are performed by the specialized programs within single branches. In order to reduce nondeterminism we also make use of mode information for guiding the unfolding process. To exemplify our technique, we show that we can automatically derive very efficient semideterministic matching programs and semideterministic parsers for regular languages. The derivations we have performed could not have been done by previously known partial evaluation techniques.