RFR: 8282664: Unroll by hand StringUTF16 and StringLatin1 polynomial hash loops

[Piotr Tarsa]

On Fri, 28 Oct 2022 20:43:04 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> Porting to aarch64 and other platforms can be done as follow-ups and shouldn't block integration.

I'm not an expert in JVM internals, but there's an already seemingly working String.hashCode intrinsification that's ISA independent: https://github.com/openjdk/jdk/pull/6658 It operates on higher level than direct assembly instructions, i.e. it operates on the ISA-independent vector nodes, so that all hardware platforms that support vectorization would get speedup (i.e. x86-64, x86-32, arm32, arm64, etc), therefore reducing manual work to get all of them working. I wonder why that pull request got no visible interest?

Forgive me if I got something wrong :)

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PR: https://git.openjdk.org/jdk/pull/10847