[aarch64-port-dev ] RFR(T): 8226222: [JVMCI] Export AArch64 field VM_Version::_psr_info.dczid_el0

[Vladimir Kozlov]

This is purely JVMCI changes for aarch64 code which is not present in JDK8u and is not requires in graal-jvmci-8.
But GraalVM would support jdk11u soon where this code is present. My question was about to have versioned code in 
graal-jvmci for JDK 11u.

On other hand I am perfectly fine to have this change only in latest JDK (jdk 14). As Pengfei correctly pointed we would 
not do any Graal update in 11u.

Pengfei, to you need sponsor to push your changes?

Thanks,
Vladmir

On 6/18/19 1:02 AM, Pengfei Li (Arm Technology China) wrote:
> Hi,
> 
>>> This looks fine to me. We can push it into jdk/jdk (which is jdk 14 now).
>>> I am not sure where we should backport this. Doug, what do you think?
>>
>> I’m not familiar with the OpenJDK backport decision making process so I’m
>> not exactly sure what you’re asking me.
> 
> Thanks for your review.
> 
> I just read the JDK Update Guidance[1] and JDK Release Process[2]. According to the rules, this patch should be backported only to jdk11u. But as this change is just a support of Graal compiler optimization and latest Graal code won't be synced with jdk11u any more,  I don't think we have the need to do the backport. On the other hand, the Graal compiler has the ability to check the existence of a given field and give up optimization if required field is not present. So I think there should be no compatibility issue between the Graal compiler and multiple JDK versions, even if we don't do the backport.
> 
> [1] https://wiki.openjdk.java.net/display/JDKUpdates/JDK+Updates+Guidance
> [2] http://openjdk.java.net/jeps/3
> 
> --
> Thanks,
> Pengfei
>