On Sat, 12 Nov 2022 02:08:19 GMT, Vladimir Ivanov <vliva...@openjdk.org> wrote:
> Also, I'd like to note that C2 auto-vectorization support is not too far away > from being able to optimize hash code computations. At some point, I was able > to achieve some promising results with modest tweaking of SuperWord pass: > https://github.com/iwanowww/jdk/blob/superword/notes.txt > http://cr.openjdk.java.net/~vlivanov/superword.reduction/webrev.00/ Intriguing. How far off is this - and do you think it'll be able to match the efficiency we see here with a memoized coefficient table etc? If we turn this intrinsic into a stub we might also be able to reuse the optimization in other places, including from within the VM (calculating String hashCodes happen in a couple of places, including String deduplication). So I think there are still a few compelling reasons to go the manual route and continue on this path. ------------- PR: https://git.openjdk.org/jdk/pull/10847
