Add Keccak #65
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Add Keccak #65
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Rebase on top of #81 |
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When `split_heuristic_preprocess_naive_interleaving` is enabled, SLOTHY preprocesses the input by naively reordering instructions according to their depths in the computational flow graph. This commit introduces another naive interleaving strategy "alternate" which will make SLOTHY alternate evenly between instructions tagged with `interleaving_class=0/1`. This is useful when two sequential blocks of code are to be interleaved as evenly as possible, which is common in scalar/Neon hybrids.
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WIP adding Keccak via SLOTHY.
Right now this is a hybrid 4x Keccak (2 scalar, 2 Neon). I de-interleaved the previous manual-interleaved code and optimized it via SLOTHY. There is still a lot of potential for refactoring.
In the current state (slothy-optimizer/pqax@c69030c), the results look as follow:
For reference:
The 6624 is already quite a bit faster than the 7288 reported in https://kannwischer.eu/papers/2022_armv8keccak.pdf
This is still slower than the 1x scalar one in the same paper which was 1418; 1418*4=5672)
Related to slothy-optimizer/pqax#6