RFR: 8261553: Efficient mask generation using BMI2 BZHI instruction [v2]

[Claes Redestad]

On Thu, 11 Feb 2021 12:22:29 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> Hi Claes,
> 
> Here is the JMH performance data over CLX for arraycopy benchmarks:
> http://cr.openjdk.java.net/~jbhateja/8261553/JMH_PERF_CLX_BASELINE.txt
> http://cr.openjdk.java.net/~jbhateja/8261553/JMH_PERF_CLX_WITH_OPTS.txt
> 
> Regards,
> Jatin

Thanks! Eyeballing the results it looks like a mixed bag. There even seems to be a few regressions such as this: 

o.o.b.java.lang.ArrayCopyUnalignedSrc.testLong                   1200     N/A   avgt    2     61.663           ns/op
--> 
o.o.b.java.lang.ArrayCopyUnalignedSrc.testLong                   1200     N/A   avgt    2     74.160           ns/op

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PR: https://git.openjdk.java.net/jdk/pull/2522