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Partial Redundancy Elimination on Predicated Code

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Static Analysis (SAS 2000)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 1824))

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Abstract

Partial redundancy elimination (PRE) is one of the most important and widespread optimizations in compilers. However, current PRE-techniques are inadequate to handle predicated code, i.e., programs where instructions are guarded by a 1-bit register that dynamically controls whether the effect of an instruction should be committed or nullified. In fact, to exclude corrupting the semantics they must be overly conservative making them close to useless. Since predicated code will be more and more common with the advent of the IA-64 architecture, we present here a family of PRE-algorithms tailored for predicated code. Conceptually, the core element of this family can be considered the counterpart of busy code motion of [17]. It can easily be tuned by two orthogonal means. First, by adjusting the power of a preprocess feeding it by information on predication. Second, by relaxing or strengthening the constraints on synthesizing predicates controlling the movability of computations. Together with extensions towards lazy code motion, this results in a family of PRE-algorithms spanning a range from tamed to quite aggressive algorithms, which is illustrated by various meaningful examples.

Part oft his work was done while the second author was working at CNRS/PRiSM Laboratory, University of Versailles, 78035 Versailles, France.

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Author information

Authors and Affiliations

  1. Universität Dortmund, D-44221, Dortmund, Germany

    Jens Knoop

  2. Intel Corp. – Microcomputer Software Lab,  

    Jean-François Collard

  3. Intel Corp. – Microprocessor Research Lab, Santa Clara, CA, 95052, USA

    Roy Dz-ching Ju

Authors
  1. Jens Knoop
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  2. Jean-François Collard
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  3. Roy Dz-ching Ju
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Editor information

Editors and Affiliations

  1. Department of Computer Science, University of California, Los Angeles, USA

    Jens Palsberg

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© 2000 Springer-Verlag Berlin Heidelberg

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Knoop, J., Collard, JF., Ju, R.Dc. (2000). Partial Redundancy Elimination on Predicated Code. In: Palsberg, J. (eds) Static Analysis. SAS 2000. Lecture Notes in Computer Science, vol 1824. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45099-3_14

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  • DOI: https://doi.org/10.1007/978-3-540-45099-3_14

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-67668-3

  • Online ISBN: 978-3-540-45099-3

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