[jdk17u] RFR: 8271567: AArch64: AES Galois CounterMode (GCM) interleaved implementation using vector instructions

[Andrew Haley]

On Mon, 25 Oct 2021 14:11:26 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

> I'd be happy with "include the patch but disable the intrinsic by default". That poses a pretty low risk for users who don't need this but, as you say, should a big difference for apps that need AES GCM -- enough for them to want it despite the limited upstream baking time.

There's no point simply turning off acceleration for safety because this patch includes a partial rewrite of the code that gets executed even when the new accelerator is disabled, so it'd add risk without improving anything: a very bad bargain.
What I'll do instead is alter the patch to leave the old code unchanged when AES/GCM acceleration is disabled.

This is a bit of a "Physician, heal thyself!" moment -- it's what I'm forever asking back-porters to do for JDK 11u. Oops, my bad.

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PR: https://git.openjdk.java.net/jdk17u/pull/87