RFR: 8327652: S390x: Implements SLP support [v7]

[Lutz Schmidt]

On Wed, 27 Mar 2024 13:24:39 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> ... I think that classical benchmarks didn't show a significant performance impact, but I don't remember exactly, either. ...

Yes, you need "long" strings (>= 32 characters) for the vector code to kick in. Once it kicks in, there is a performance improvement. Hard to say which applications might benefit. For too short strings I do not expect a visible performance penalty. It's just a shift and a branch. 

Let the maintainers decide.

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PR Comment: https://git.openjdk.org/jdk/pull/18162#issuecomment-2023244461