RFR: 8256488: [aarch64] Use ldpq/stpq instead of ld4/st4 for small copies in StubGenerator::copy_memory

[Andrew Haley]

On 24/11/2020 13:08, Andrew Haley wrote:
> On 24/11/2020 10:19, Evgeny Astigeevich wrote:
>> The microbenchmarks are ArrayCopy* microbenchmarks which are a part of OpenJDK: https://github.com/openjdk/jdk/tree/master/test/micro/org/openjdk/bench/java/lang
> 
> Sorry, my mistake. I'll try this now.

Trying on ThunderX 2, it seems that the differences between ldpq/stpq and ld4/st4
are too small to be statistically significant before and after this patch. For
that reason, I don't object.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671