AARCH64 support for lworld

Dmitry Samersoff dms at samersoff.net
Tue Oct 23 08:36:48 UTC 2018


As soon as lw1 is out ...

Is there a webrev of changes between lw1 and plain hotspot?


On 03.09.2018 11:33, Tobias Hartmann wrote:
> Hi Dmitry,
> we use the "repo-valhalla" affects and fix version for value type related bugs/enhancements, so it
> would make sense if you create an enhancement in this category and also add the label "lworld".
> Great that you plan to port this work to Aarch64!
> Some background information from the JIT side: The current implementation should be platform
> independent except for the calling convention changes. These are:
> 1) Pass value types as fields (-XX:+ValueTypePassFieldsAsArgs)
> 2) Return value types as fields (-XX:+ValueTypeReturnedAsFields)
> 3) Special entry point for nullable value types (JDK-8209134)
> 1) and 2) are currently disabled and need to be reworked for value types. I plan to work on this in
> the near future but you can safely ignore these for now (you will most likely get some build
> failures due to interface changes though that you need to fix). 3) was added just recently with
> (JDK-8209134) and should be straight forward to port.
> Here is a webrev of all the hotspot changes we did:
> http://cr.openjdk.java.net/~thartmann/valhalla/hs_changes/
> Unfortunately, it's very outdated but I will hopefully find some time to update it soon.
> Best regards,
> Tobias
> On 03.09.2018 09:46, Dmitry Samersoff wrote:
>> Hello Everybody,
>> I started implementation of AARCH64 support for lworld.
>> I'm on very early stage so any advices are highly appreciated.
>> Should I file a CR for this task somewhere? What is correct way to do it?
>> -Dmitry

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