Design, Implementation, and Evaluation of Optimizations in a Just-In-Time Compiler Kazuaki Ishizaki, Motohiro Kawahito, et al
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Outline Introduction
Introduction Advantage and Disadvantage of Java
Regular Compiler Looses the Portability and Reusability of Code.
JIT Compiler Translation occurs when new method is called.
Array-Bound Elimination (Cont.)
CSE (Cont.) CSE (Cont.)
Result - Overall Conclusion
Design,
Implementation
, and Evaluation of Optimizations in a Just-In-Time Compiler
Kazuaki Ishizaki,
Motohiro Kawahito
, et al.
IBM Tokyo Research Laboratory
Presentation By:
Allen Chu
Outline
Introduction
Motivation
JIT Optimizations
Exception
Elimination
,
Common Subexpression Elimination
Type
Inclusion Test
Result
Conclusion
Introduction
Advantage
and Disadvantage of Java
Safety (Array-Bound Check)
Reusability and Portability
But It Is Slow
Compiler
for Java
Compiler (byte code to native code)
Just-In-Time Compiler
Motivation
Regular Compiler Looses the Portability and Reusability of Code.
Goal for JIT Compiler
Preserve
Safety and Reusability
Translation Time of JIT Compiler + Execution Time of Native Code <= Running Time on JVM
JIT Compiler
Translation occurs when new method is called.
Exception
Check Elimination
Null-Pointer Check Eliminated By Data Flow Analysis
Array-Bound Check Eliminated By Propagating the Information of Checked Exception in Data Flow Analysis
Keep Track of Indices and Range of Checked Indices.
Array-Bound Elimination (Cont.)
CSE
Scalar
Replacement Of Array Element
Consecutive Array Access Using Interior Pointer
Instance Variable Elimination
Replace “this.variable”
CSE (Cont.)
CSE (Cont.)
Type Inclusion Test
Result - “Compress”
Result - Overall
Conclusion
All Optimizations Do Not Improve Execution Speed All the Time
Overall Combined Optimizations Do Improve Execution.
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