RFR: 8277617: Adjust AVX3Threshold for copy/fill stubs

[Sandhya Viswanathan]

On Wed, 1 Dec 2021 03:38:00 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> > @DamonFool There are jmh tests for Arraycopy in test/micro/org/openjdk/bench/java/lang/Arraycopy.java.
> 
> So how about posting the detailed perf data before and after this patch? Thanks.

Before:
Benchmark                                    Mode  Cnt   Score   Error  Units
ArrayCopy.arrayCopyObject                    avgt    5  19.538 ± 0.073  ns/op
ArrayCopy.arrayCopyObjectNonConst            avgt    5  20.513 ± 0.104  ns/op
ArrayCopy.arrayCopyObjectSameArraysBackward  avgt    5  15.919 ± 0.652  ns/op
ArrayCopy.arrayCopyObjectSameArraysForward   avgt    5  15.669 ± 0.359  ns/op

After:
Benchmark                                    Mode  Cnt   Score   Error  Units
ArrayCopy.arrayCopyObject                    avgt    5  16.957 ± 0.584  ns/op
ArrayCopy.arrayCopyObjectNonConst            avgt    5  17.221 ± 0.036  ns/op
ArrayCopy.arrayCopyObjectSameArraysBackward  avgt    5  12.952 ± 0.068  ns/op
ArrayCopy.arrayCopyObjectSameArraysForward   avgt    5  13.562 ± 0.124  ns/op

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PR: https://git.openjdk.java.net/jdk/pull/6512