RFR: 8159063: aarch64: optimise unaligned array copy long

[Vladimir Kozlov]

Please, hold on pushing this RFE into jdk 9. We are post FC and it needs 
approval.

Thanks,
Vladimir

On 6/8/16 8:25 AM, Edward Nevill wrote:
> Hi,
>
> Please review the following webrev
>
> http://cr.openjdk.java.net/~enevill/8159063/webrev
>
> JIRA Issue: https://bugs.openjdk.java.net/browse/JDK-8159063
>
> This webrev optimises the code generate for copy array long to ensure
> that loads/stores are always done on 128 bit boundaries.
>
> This can be switched on/off with -XX:+/-AvoidUnalignedAccesses which is
> set by default for those partners where there is a benefit.
>
> The following is my test case.
>
> http://cr.openjdk.java.net/~enevill/8159063/ArrayCopyAligned.java
>
> To run do
>
> java ArrayCopyAligned <iters> <start> <end> <step>
>
> This shows the results for partners A and B with the parameters 10 0
> 1024 32.
>
> http://cr.openjdk.java.net/~enevill/8159063/arraycopy.pdf
>
> OK to push to jdk8u now (and later to jdk9)?
>
> Thanks,
> Ed.
>
>