RFR: 8209093 - JEP 340: One AArch64 Port, Not Two

[David Holmes]

Hi Bob,

On 18/09/2018 11:17 PM, Bob Vandette wrote:
> I only did some basic testing of the hard-float abi.  Bell SW has offered to do more extensive testing
> as part of this JEP.
> 
> I have no way of knowing if any of the other profiles are being used but I would think it’s
> worth keeping them in the event that someone wants to try to build/test these other configurations.
> 
> The goal of this JEP is to eliminate the arm64 port and not cause any other changes in behavior.

Sorry I was under the mistaken impression that all of the Oracle ARM 
port was being removed, but it is only the 64-bit part.

That said it would concern me greatly if people are still building for 
anything older than ARMv7 with MP support! The work I'm doing to always 
act as-if MP is not only potentially inefficient on a uniprocessor, but 
for ARM variants without MP support, potentially it won't even run if 
instructions don't exist. I need to look into this further.

Thanks,
David

> Bob.
> 
> 
>> On Sep 17, 2018, at 10:53 PM, David Holmes <david.holmes at oracle.com> wrote:
>>
>> Hi Bob,
>>
>> On 18/09/2018 2:20 AM, Bob Vandette wrote:
>>> Please review the changes related to JEP 340 which remove the second 64-bit ARM port
>>> from the JDK.
>>> http://cr.openjdk.java.net/~bobv/8209093/webrev.01
>>> I’ve testing building the remaining 32 and 64 bit ARM ports including the minimal, client and server VMs.
>>> I’ve run specJVM98 on the three 32-bit ARM VMs.
>>
>> Did you test all the ARM related abi-profiles? It seems to me they were only for Oracle's ARM32 port and may have never been used otherwise. I would have expected all that stuff to be removed.
>>
>> Cheers,
>> David
>>
>>> I also verified that Linux x64 builds.
>>> Bob.
>