Bug ID: JDK-8078438 Interpreter should support conditional card marks (UseCondCardMark) on x86 and aarch64

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JDK 9
9 b72Fixed

noreg-other comments: when pushing this change I forgot to hg add the test originally enclosed. It will be added as part of JDK-8078438.
19-06-2015
Updated webrev: http://cr.openjdk.java.net/~shade/8078438/webrev.03/ Testing: * builds fine on Linux x86_64 * eyeballing generated code on x86_64, still the same: http://cr.openjdk.java.net/~shade/8078438/perf.txt * JPRT fastdebug on all platforms * hotspot jtreg with -XX:-UseCondCardMark on all platforms * hotspot jtreg with -XX:+UseCondCardMark on all platforms
06-05-2015
It does not seem a good idea to commit this before JDK-8079315 is fixed, as this widens the possibility for failure. Marked as blocker.
06-05-2015
See the extended discussion on hotspot-gc-dev: http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-April/013105.html It would seem this will require more work to make UseCondCardMark code correct.
01-05-2015
The interpreter code in question affects card marking, which is GC. The GC group is currently reviewing this change on the thread and has provided good comments. This isn't a runtime change.
29-04-2015
Coleen: It's not clear to me why this RFE was moved to the GC team. Are we expected to take some action here?
29-04-2015
I moved this to the gc category and reset it so GC bug triage sees it.
28-04-2015
Updated webrev (merged JDK-8078609, plus a sanity test): http://cr.openjdk.java.net/~shade/8078438/webrev.02/
24-04-2015
Performance assessment shows the intended improvements: http://cr.openjdk.java.net/~shade/8078438/perf.txt
23-04-2015
Updated webrev: http://cr.openjdk.java.net/~shade/8078438/webrev.01/
23-04-2015
Initial webrev: http://cr.openjdk.java.net/~shade/8078438/webrev.00/
22-04-2015

Blocks :	JDK-8079315 - UseCondCardMark broken in conjunction with CMS precleaning on x86
Duplicate :	JDK-8078609 - AARCH64: Interpreter should support conditional card marks (UseCondCardMark)
Relates :	JDK-8129332 - Missing test case for JDK-8078438
Relates :	JDK-8129324 - SPARC: Interpreter should support conditional card marks
Relates :	JDK-8076987 - C1 should support conditional card marks (UseCondCardMark)
Relates :	JDK-8078609 - AARCH64: Interpreter should support conditional card marks (UseCondCardMark)