RFR: 8282664: Unroll by hand StringUTF16 and StringLatin1 polynomial hash loops [v13]

[Vladimir Ivanov]

On Sun, 13 Nov 2022 19:50:46 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> ... several challenges were brought up to the table, including how to deal with all the different contingencies that might be the result of a safepoint, including deoptimization.

FTR if the intrinsic is represented as a stand-alone stub, there's no need to care about deoptimization. (In such cases, deopts happen on return from the stub.) It wouldn't be allowed to be a leaf call anymore, but a safepoint check and an OOP map would do the job.

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