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Would be good to test this here, there is an optimised nthash (32-bits) see https://github.com/RagnarGrootKoerkamp/minimizers/blob/master/src/par/nthash.rs#L56 and https://curiouscoding.nl/posts/fast-minimizers/
Another note:
On another node, you really don't need the massive hardcoded 2D tables that are in the original C++ source.
Instead, simply precompute the roll-0, and the roll-(k%31) and roll-(k%33) tables for the current k. (And possibly cache them in a NtHasher object with constant k.)
May then also be useful in ska/sparrowhawk for bloom filter with hashes
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