Loading...

XML

Word

Printable

Type: Sub-task
Resolution: Fixed
Priority: P4
Fix Version/s: 9
Affects Version/s: None
Component/s: core-libs
Labels:
None

Subcomponent:
java.lang.invoke

It seems that in addition to ~~JDK-8130920~~, getObject pays additional cost with C1:
http://cr.openjdk.java.net/~shade/8130923/ObjectTest.java

o.o.v.get.acc.ObjectTest.plain avgt 15 16.382 ± 0.009 ns/op
o.o.v.get.acc.ObjectTest.unsafe avgt 15 18.902 ± 0.009 ns/op
o.o.v.get.acc.ObjectTest.varHandle avgt 15 104.206 ± 5.003 ns/op

The disassembly shows additional Class.cast dance:
http://cr.openjdk.java.net/~shade/8130923/c1.perfasm
http://cr.openjdk.java.net/~shade/8130923/c2.perfasm

is blocked by

JDK-8131782 C1 Class.cast optimization breaks when Class is loaded from static final

Resolved

relates to

JDK-8135033 C1 should fast-path Object.class.isInstance(obj) to null check

Open

JDK-8131682 C1 should use multibyte nops everywhere

Resolved

JDK-8131782 C1 Class.cast optimization breaks when Class is loaded from static final

Resolved

JDK-8130920 C1 trouble in VarHandle.get tests

Resolved

Assignee:: Aleksey Shipilev

Reporter:: Aleksey Shipilev

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Created:: 2015-07-10 08:42

Updated:: 2017-01-30 05:29

Resolved:: 2016-05-19 04:48