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

[Severin Gehwolf]

On Fri, 2016-04-22 at 11:11 +0200, Severin Gehwolf wrote:
> Hi,
> 
> Could somebody please review and approve this fix for JDK8u Zero? 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/webr
> ev.01/
> 
> Once the April CPU patches hit JDK 9 trees we need to make sure this
> gets properly forward-ported. Unfortunately this hasn't happened yet
> (or maybe it didn't reach jdk9/hs yet).

NVM. It looks like it's in jdk9/dev now. The webrev should be the same,
though.

> Thoughts?
> 
> Thanks,
> Severin