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Effectiveness of cross-platform optimizations for a java just-in-time compiler

Published: 26 October 2003 Publication History

Abstract

This paper describes the system overview of our Java Just-In-Time (JIT) compiler, which is the basis for the latest production version of IBM Java JIT compiler that supports a diversity of processor architectures including both 32-bit and 64-bit modes, CISC, RISC, and VLIW architectures. In particular, we focus on the design and evaluation of the cross-platform optimizations that are common across different architectures. We studied the effectiveness of each optimization by selectively disabling it in our JIT compiler on three different platforms: IA-32, IA-64, and PowerPC. Our detailed measurements allowed us to rank the optimizations in terms of the greatest performance improvements with the smallest compilation times. The identified set includes method inlining only for tiny methods, exception check eliminations using forward dataflow analysis and partial redundancy elimination, scalar replacement for instance and class fields using dataflow analysis, optimizations for type inclusion checks, and the elimination of merge points in the control flow graphs. These optimizations can achieve 90% of the peak performance for two industry-standard benchmark programs on these platforms with only 34% of the compilation time compared to the case for using all of the optimizations.

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    cover image ACM Conferences
    OOPSLA '03: Proceedings of the 18th annual ACM SIGPLAN conference on Object-oriented programing, systems, languages, and applications
    October 2003
    430 pages
    ISBN:1581137125
    DOI:10.1145/949305
    • cover image ACM SIGPLAN Notices
      ACM SIGPLAN Notices  Volume 38, Issue 11
      Special Issue: Proceedings of the OOPSLA '03 conference
      November 2003
      417 pages
      ISSN:0362-1340
      EISSN:1558-1160
      DOI:10.1145/949343
      Issue’s Table of Contents
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    Published: 26 October 2003

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    Author Tags

    1. Java
    2. just-in-time compiler
    3. optimization

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