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A Framework for Assignment Motion Based Program Transformations

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Part of the Lecture Notes in Computer Science book series (LNCS, volume 1539)

Abstract

In this chapter we present a general framework for assignment motion based program transformations that covers all the applications considered in Chapter 6: PDCE, PFCE, PRAE and UPRE. Within this framework the interleaving of admissible assignment motions and eliminations can be investigated in a general setting. Section 7.1 presents the foundation for this framework. The instances of the framework, motion-elimination couples, combine assignment motions with eliminations. As the presence of second order effects requires to apply the component transformations repeatedly, this process raises the following questions of primary interest:
  • Is the process confluent, i. e. is the final result independent from the application order? Section 7.2 is devoted to this question.

  • What are the additional costs (compared to the elementary transformations) in terms of computational complexity? This question is addressed in Section 7.3.

Section 7.4 finally considers UPRE as a more ambitious application for reasoning within the framework.

Keywords

Basic Block Elementary Transformation Program Point Expression Motion Program Path 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

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