RFR: 8294073: Performance improvement for message digest implementations

[Aleksey Shipilev]

On Wed, 21 Sep 2022 15:14:22 GMT, Xue-Lei Andrew Fan <xuelei at openjdk.org> wrote:

> But you let me convinced that this may not be worthy of the effort.

Let's think about it and not discount it right away. 1% improvement on OpenJDK scale is still quite significant, if we can show the non-interpreter modes benefit from it. Maybe older X86 and AArch64 are our targets, since it is not guaranteed to have SHA hardware intrinsics?

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PR: https://git.openjdk.org/jdk/pull/10365