Question on status of a few bugs in OpenJDK 6

[Vladimir Kozlov]

 > Could you please do me a favor and review "7032314: Allow to generate CallLeafNoFPNode in IdealKit",
 > see if it's safe to  be applied it to HS20? Just this one, independent of other loopPredicate-related fixes.

Yes, it is safe if you mean next changes:

http://cr.openjdk.java.net/~kvn/7032314/webrev

I don't see and remember any bugs related to this so it should be safe. It was just code refactoring.

Vladimir

On 3/8/12 10:31 AM, Krystal Mok wrote:
> Hi Vladimir,
>
> Inline:
>
> On Fri, Mar 9, 2012 at 2:04 AM, Vladimir Kozlov <vladimir.kozlov at oracle.com <mailto:vladimir.kozlov at oracle.com>> wrote:
>
>     Hi, Kris
>
>     As I know, only 2 bugs from these affect JDK6.
>
> Got it. That's reassuring, thanks a lot :-)
>
>     First is 5091921 but the fix is too big to backport it to jdk6 and it also rely on new code in HS21 VM which is only
>     present in JDK7
>
> So it was too big...I did see that it relies on a new loopPredicate.cpp file, with later patches to that file, too.
>
>     (we stop delivering new VM into jdk6 updates after HS20 VM).
>
> Yes, I know. We're still using JDK6 in production, and somehow we need to patch the VM a little bit for a couple of
> features, so we've been using HSX20 as the base.
>
>     Second bug 7044738 was backported into product jdk6u28. I don't know if OpenJDK6 community took it.
>
> As of now, nope. HS20-b12 in OpenJDK 6 update 24 doesn't have that yet.
>
>     The rest is bug tail of 5091921 and related changes so they do not affect jdk6.
>
> Could you please do me a favor and review "7032314: Allow to generate CallLeafNoFPNode in IdealKit", see if it's safe to
> be applied it to HS20? Just this one, independent of other loopPredicate-related fixes.
>
>     Regards,
>     Vladimir
>
> Thanks,
> Kris Mok
>
>
>     On 3/8/12 3:37 AM, Krystal Mok wrote:
>
>         Hi all,
>
>         Guess I'm asking on the wrong list, but I don't know which list I should be sending this to for OpenJDK 6-only
>           issues.
>         The jdk6-dev list is mostly silent now, doesn't seem to be the right place, neither.
>         Maybe I should be asking the sustaining team?
>
>         I was looking at what changes went into recent OpenJDK 6 releases. Turns out OpenJDK 6 build 23 is the closest
>         version
>         to JDK 6 update 25, and OpenJDK 6b24 is the closest version to 6u30. Reading through the release changes [1][2],
>         though,
>         tells that:
>         1. The loop optimization bug that crashes the VM is fixed:
>            7070134: Hotspot crashes with sigsegv from PorterStemmer
>         2. A few other related bugs aren't included in OpenJDK 6 yet, as of now:
>            5091921: Sign flip issues in loop optimizer
>            7052494: Eclipse test fails on JDK 7 b142
>            7004535: Clone loop predicate during loop unswitch
>            7068051: SIGSEGV in PhaseIdealLoop::build_loop___late_post on T5440
>            7044738: Loop unroll optimization causes incorrect result
>            7077439: Possible reference through NULL in loopPrdicate.cpp:726
>
>         I suppose some of these fixes are actually in the product JDK 6u29+ already, like 7044738.
>
>         So, questions:
>         * Could anyone help identify whether these bugs affect OpenJDK 6 or not?
>         * If they do, what are the plans for porting the fixes back to OpenJDK 6?
>         * And what is the general plan for future maintence of OpenJDK 6?
>         * Is there any place in the public that we can track what's going to be backported into OpenJDK 6?
>         * Will it sort of EOL along with the product JDK 6?
>
>         Thanks,
>         Kris Mok
>
>         [1]: https://blogs.oracle.com/kto/__resource/OpenJDK6-B23-Changes.__html
>         <https://blogs.oracle.com/kto/resource/OpenJDK6-B23-Changes.html>
>         [2]: https://blogs.oracle.com/__openjdk6releases/resource/__OpenJDK6-B24-Changes.html
>         <https://blogs.oracle.com/openjdk6releases/resource/OpenJDK6-B24-Changes.html>
>
>