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MPLR 2019
Sun 20 - Fri 25 October 2019 Athens, Greece
co-located with SPLASH 2019
Mon 21 Oct 2019 11:00 - 11:30 at Room 1 - Virtual machines

On-stack replacement (OSR) is a common technique employed by dynamic compilers to reduce program warm-up time. OSR allows switching from interpreted to compiled code during the execution of this code. The main targets are long running loops, which need to be represented explicitly, with dedicated information about condition and body, to be optimized at run time. Bytecode interpreters, however, represent control flow implicitly via unstructured jumps and thus do not exhibit the required high-level loop representation. To enable OSR also for jump-based—often called unstructured—languages, we propose the partial reconstruction of loops in order to explicitly represent them in a bytecode interpreter. Besides an outline of the general idea, we implemented our approach in Sulong, a bytecode interpreter for LLVM bitcode, which allows the execution of C/C++. We conducted an evaluation with a set of C benchmarks, which showed speed-ups in warm-up of up to 9x for certain benchmarks. This facilitates execution of programs with long-running loops in rarely called functions, which would yield significant slowdown without OSR. While shown with a prototype implementation, the overall idea of our approach is generalizable for all bytecode interpreters.

Mon 21 Oct

mplr-2019-papers
11:00 - 12:30: MPLR 2019 - Virtual machines at Room 1
mplr-2019-papers11:00 - 11:30
Talk
Raphael MosanerJohannes Kepler University Linz, David LeopoldsederJohannes Kepler University Linz, Manuel RiggerETH Zurich, Roland SchatzJohannes Kepler University Linz, Hanspeter MössenböckJKU Linz, Austria
Pre-print
mplr-2019-papers11:30 - 12:00
Talk
Fabio NiephausHasso Plattner Institute, University of Potsdam, Tim FelgentreffOracle Labs, Potsdam, Robert HirschfeldHasso-Plattner-Institut (HPI), Germany
DOI Pre-print
mplr-2019-papers12:00 - 12:30
Talk
Robbert Gurdeep SinghUniversiteit Gent, Belgium, Christophe ScholliersUniversiteit Gent, Belgium
DOI Authorizer link Pre-print