[aarch64-port-dev ] RFC: JEP - One AArch64 Port, Not Two

[Magnus Ihse Bursie]

On 2018-08-23 17:13, Bob Vandette wrote:
> As a follow-on to the previous thread  "ARM port consolidation” [1],
> please review and comment on this newly filed JEP that removes
> one of the two AArch64 ports from the JDK.
>
> JEP:
>
> https://bugs.openjdk.java.net/browse/JDK-8209093
Looks good! (Or as we say in Sweden: Äntligen! :-))

One question: I remember there were some guys from Linaro who compared 
aarch64 vs arm64 in microbenchmarks, and found that while aarch64 had 
the superior performance most of the time, there were some benchmarks 
where arm64 was fastest.

Has these been analyzed, and the performance on aarch64 brought in line 
with arm64?

> Here’s a prototype of the changes that would be done under this JEP.
>
> http://cr.openjdk.java.net/~bobv/8209093/webrev.00

Generally looks good. I have not looked at too much detail since it's 
just a prototype, but I noted that you just removed --with-cpu-port, 
instead of deprecating it. That needs to be fixed for the real deal.

/Magnus



>
>
> [1] http://mail.openjdk.java.net/pipermail/hotspot-dev/2018-June/032756.html
>
> Bob.
>
>
>
>