A compiler framework for speculative analysis and optimizations

Jin Lin, Tong Chen, Wei Chung Hsu, Pen Chung Yew, Roy Dz Ching Ju, Tin Fook Ngai, Sun Chan

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations

Abstract

Speculative execution, such as control speculation and data speculation, is an effective way to improve program performance. Using edge/path profile information or simple heuristic rules, existing compiler frameworks can adequately incorporate and exploit control speculation. However, very little has been done so far to allow existing compiler frameworks to incorporate and exploit data speculation effectively in various program transformations beyond instruction scheduling. This paper proposes a speculative SSA form to incorporate information from alias profiling and/or heuristic rules for data speculation, thus allowing existing program analysis frameworks to be easily extended to support both control and data speculation. Such a general framework is very useful for EPIC architectures that provide checking (such as advanced load address table (ALAT) [10]) on data speculation to guarantee the correctness of program execution. We use SSAPRE [21] as one example to illustrate how to incorporate data speculation in those important compiler optimizations such as partial redundancy elimination (PRE), register promotion, strength reduction and linear function test replacement. Our extended framework allows both control and data speculation to be performed on top of SSAPRE and, thus, enables more aggressive speculative optimizations. The proposed framework has been implemented on Intel's Open Research Compiler (ORC). We present experimental data on some SPEC2000 benchmark programs to demonstrate the usefulness of this framework and how data speculation benefits partial redundancy elimination.

Original languageEnglish (US)
Pages (from-to)289-299
Number of pages11
JournalACM SIGPLAN Notices
Volume38
Issue number5
DOIs
StatePublished - May 2003
EventProceedings of the ACM Sigplan 2003 Conference on Programming Language Design and Implementation - San Diego, CA, United States
Duration: Jun 9 2003Jun 11 2003

Keywords

  • Data speculation
  • Partial redundancy elimination
  • Register promotion
  • Speculative SSA form
  • Speculative weak update

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