An efficient representation for sparse sets

  • Authors:
  • Preston Briggs;Linda Torczon

  • Affiliations:
  • Rice Univ., Houston, TX;Rice Univ., Houston, TX

  • Venue:
  • ACM Letters on Programming Languages and Systems (LOPLAS)
  • Year:
  • 1993

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Abstract

Sets are a fundamental abstraction widely used in programming. Many representations are possible, each offering different advantages. We describe a representation that supports constant-time implementations of clear-set, add-member, and delete-member. Additionally, it supports an efficient forall iterator, allowing enumeration of all the members of a set in time proportional to the cardinality of the set.We present detailed comparisons of the costs of operations on our representation and on a bit vector representation. Additionally, we give experimental results showing the effectiveness of our representation in a practical application: construction of an interference graph for use during graph-coloring register allocation.While this representation was developed to solve a specific problem arising in register allocation, we have found it useful throughout our work, especially when implementing efficient analysis techniques for large programs. However, the new representation is not a panacea. The operations required for a particular set should be carefully considered before this representation, or any other representation, is chosen.