RFR: 8333867: SHA3 performance can be improved

[Daniel Jeliński]

On Tue, 11 Jun 2024 17:39:29 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> There is no other use.. That array is there for the sole purpose of  holding the input as a long array before it gets xor-ed into the state.
>
> okay

Could you try using MethodHandles instead of b2lLittle? Similar to what's used in ChaCha20:
https://github.com/openjdk/jdk/blob/b77bd5fd6a6f7ddbed90300fba790da4fb683275/src/java.base/share/classes/com/sun/crypto/provider/ChaCha20Cipher.java#L132-L134

with MethodHandles you could drop longBuf, removing unnecessary allocation on the only platform where the intrinsic is implemented (MacOSX-aarch64)

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/19632#discussion_r1635309517