RFR(s): 8154210: Zero: Better byte behaviour

[Coleen Phillimore]

This looks good.  Sorry, I thought I'd fixed this but apparently not 
correctly.
I'll sponsor it.

Coleen


On 4/22/16 8:42 AM, Severin Gehwolf wrote:
> Hi,
>
> [new thread for JDK 9].
>
> Could somebody please review this Zero-only fix for jdk9/dev? The April
> CPU patches for OpenJDK broke this (bug 8132051). Please see the bug
> for details.
>
> The fixes are:
> - Fix the jump table which is used for Zero release builds, since
>    JDK-8132051 introduced a new bytecode _fast_zputfield.
> - Make sure that results, which are a subword of a stack slot
>    (possibly narrowed) are always at the lowest address.
>
> The fix was originally written by Andrew Haley.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8154210
> webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8154210/webrev.02/
>
> Once reviewed and pushed, we'd need a similar fix[2] for JDK 8u Zero
> which is currently broken too. I think this fix needs to get pushed to
> jdk9/dev directly since jdk9/hs does not have the CPU fixes yet.
>
> Thoughts?
>
> Thanks,
> Severin
>
> [1] http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8154210/webrev.01/