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Type: Enhancement
Resolution: Fixed
Priority: P3
Fix Version/s: 9
Affects Version/s: hs24
Component/s: hotspot
Labels:
None

Subcomponent:
compiler
Resolved In Build:
b29
CPU:

generic
OS:

generic

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8056400	emb-9	Roland Westrelin	P3	Resolved	Fixed	b29

When arraycopy is intrinsified, it is converted as calls to specialized stubs based on what's known from the context of the arraycopy. Right now, this is done at parsing. By using a new macro node for arraycopy that is expanded later, the compiler may be able to gather more data on the context of the arraycopy and make a better choice for the stub to call.

This also opens the door to other optimizations such as inlining small copies in a series of loads/stores.

This also impacts clone and Arrays.copyOf's implementations because they rely on the arraycopy stubs as well.

backported by

JDK-8056400 Implement arraycopy as a macro node

Resolved

relates to

JDK-8058746 escape analysis special case code for array copy broken by 7173584

Closed

JDK-6700100 optimize inline_native_clone() for small objects with exact klass.

Resolved

JDK-8058349 SPECjbb2005 1.4% performance regression on Linux with 9-b29

Resolved

JDK-8307683 Loop Predication should not hoist range checks with trap on success projection by negating their condition

Resolved

JDK-8060252 JDK-7173584 compiler changes regress SPECjvm2008 on SPARC

Closed

JDK-8055153 nsk/stress/jck60/jck60014 crashes on sparc

Closed

JDK-6912521 System.arraycopy works slower than the simple loop for little lengths

Resolved

JDK-6969165 remove char[] allocation in new String(char[] buf) if buf does not escape

Closed

(4 relates to)

Assignee:: Roland Westrelin

Reporter:: Roland Westrelin

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Created:: 2012-06-01 09:02

Updated:: 2023-05-31 05:36

Resolved:: 2014-08-11 06:44

Imported:: 17/Sep/12 1:27 AM

Indexed:: 19/Jul/12 6:25 PM

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