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HotSpot JIT “Optimization”
I noticed Scala ticket #1377 the other day. Even though I think the bug is valid, it’s for different reasons to the ones supplied by the reporter. I had my doubts that the casts would have any...
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Local variables scope in HotSpot
Assume the following code: public void foo() { C c = new C(); bar(c.baz); // assume that baz does not reference c } I was under the impression that HotSpot would not garbage collect c before the local...
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32-bit or 64-bit JVM? How about a Hybrid?
Before x86-64 came along, the decision on whether to use 32-bit or 64-bit mode for architectures that supported both was relatively simple: use 64-bit mode if the application requires the larger...
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Load unsigned and better Compressed Oops
The HotSpot engineers are constantly working on improving performance. I noticed two interesting commits recently: Vladimir Kozlov improved Compressed Oops so that it doesn’t need to do...
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