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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: hs25
Affects Version/s: None
Component/s: hotspot
Labels:
- sqe-8-noreglabel-backlog-startfresh

Subcomponent:
compiler
Resolved In Build:
b15
CPU:

x86

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8006494	8	Vladimir Kozlov	P4	Resolved	Fixed	b74
JDK-8017872	7u45	Vladimir Kozlov	P4	Closed	Fixed	b01
JDK-8006378	7u40	Vladimir Kozlov	P4	Closed	Fixed	b10
JDK-8006057	hs24	Vladimir Kozlov	P4	Resolved	Fixed	b29

New x86 processors enhanced the operation of the REP MOVSB and REP STOSB instructions. A processors supports these enhancements if CPUID.(EAX=07H, ECX=0H):EBX[bit 9] is 1 (ERMS bit). VM uses stosq/stosd instructions to zero new java objects, replace them with fast-string stosb instructions when they are available. Note: we can't use REP MOVSB for arraycopy because it is not JMM compliant (not atomic and out of order).

backported by

JDK-8006057 use fast-string instructions on x86 for zeroing

Resolved

JDK-8006494 use fast-string instructions on x86 for zeroing

Resolved

JDK-8006378 use fast-string instructions on x86 for zeroing

Closed

JDK-8017872 use fast-string instructions on x86 for zeroing

Closed

relates to

JDK-8005419 Improve intrinsics code performance on x86 by using AVX2

Resolved

Assignee:: Vladimir Kozlov

Reporter:: Vladimir Kozlov

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Created:: 2012-12-26 15:55

Updated:: 2013-06-25 21:11

Resolved:: 2013-01-03 17:07

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