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

Simon Nash simon at cjnash.com
Thu Sep 20 11:48:48 UTC 2018

On 19/09/2018 07:44, David Holmes wrote:
> 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
My build for arm-sflt needs to run on ARMv5 uniprocessor maschines and my build for arm-vfp-hflt needs to run on ARMv7 
uniprocessor machines. Is the work you are doing that could cause problems with this included in JDK11 or just JDK12?


>> 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.

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