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Could we make scalar replacement work?
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Classroom Contents
Current State of JVM Escape Analysis and Downstream Optimizations
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- 1 Intro
- 2 Overview
- 3 What is Escape Analysis?
- 4 Partial Escape Analysis
- 5 EA Consuming Optimizations
- 6 Hotspot C2 EA and optimizations
- 7 Example of non escaping objects
- 8 Limitations of scalar replacement
- 9 How common is this issue?
- 10 Simple change to the experiment
- 11 Could we make scalar replacement work?
- 12 Considering the previous example...
- 13 Stack allocate if scalar replacement fails
- 14 What if C2 had stack allocation?
- 15 How did we implement this in C2
- 16 Bax.ackNode to the rescue
- 17 We had to...
- 18 GC roat scanning of stack allocated objects
- 19 Overlapping live object ranges
- 20 Current Limitations
- 21 Performance improvements
- 22 When and where can we see this patch?
- 23 Next steps
