[foreign-memaccess+abi] RFR: Performance improvement to unchecked segment ofNativeRestricted [v2]

[Radoslaw Smogura]

On Sat, 16 Jan 2021 14:59:41 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> > Hi. I've added the benchmarks:
> 
> > 
> 
> >     * benchmarks used by me;
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> > 
> 
> >     * added a new benchmarks to `LoopOverNonConstant` to compare performance of this approach with existing methods for getting values.
> 
> 
> 
> It's strange to see the performances of global segment to be worse than that of a regular segment?

Indeed. I can't understand this (I'll make additional research). I suspect that's because the access is indexed (so global memory is treated as big array), or it's more about test itself - there's additional additions and we use longs instead of ints.

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PR: https://git.openjdk.java.net/panama-foreign/pull/437