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Type:
Enhancement
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Resolution: Unresolved
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Priority:
P3
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Affects Version/s: repo-valhalla
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Component/s: core-libs
Unsafe.compareAndSetFlatValueAsBytes is slow, due to:
1. Array var handles must specialize and hold layout as a constant for C2
2. Need minimum arrayLayout0 and newSpecialArray C2 intrinsics for hot compareAndSetFlatValueAsBytes
Old:
This issue's purpose is to keep track of a potential performance regression introduced withJDK-8351569 (and discovered while investigating JDK-8343420). JDK-8351569 introduced a new overloaded version of Unsafe::getAndSet that is not intrinsified (which is used by e.g. VarHandle::getAndSet). We should evaluate how much of a performance impact this can have and potentially intrinsify it or make it call the intrinsified version.
1. Array var handles must specialize and hold layout as a constant for C2
2. Need minimum arrayLayout0 and newSpecialArray C2 intrinsics for hot compareAndSetFlatValueAsBytes
Old:
This issue's purpose is to keep track of a potential performance regression introduced with
- causes
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JDK-8367346 [lworld] VarHandleTestMethodHandleAccessValue.java fails with a timeout
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- is blocked by
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- Resolved
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- relates to
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- Resolved
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- Resolved
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