ascon: improve performance of permutation#118
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newpavlov merged 2 commits intoRustCrypto:masterfrom Apr 20, 2026
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Use a slightly different substitution implementation that is slightly
more efficient. This does require that the function is now strictly
seperated in the three layers.
The assembly with `-C opt-level=2` shows no weird instructions,
`permute_12` without `soft-compact` is fully unrolled and from and to
arrays is skipped. With `soft-compat` it's not unrolled but does also
skip from and to arrays between the iterations.
Benchmarks with and without soft-compat are quite similair (to the
point I'm guessing I'm not even running it correctly).
Permutation/1 round time: [4.6049 ns 4.6597 ns 4.7094 ns]
change: [-17.040% -15.975% -14.976%] (p = 0.00 < 0.05)
Permutation/6 rounds time: [17.179 ns 17.301 ns 17.452 ns]
change: [-27.748% -26.520% -25.229%] (p = 0.00 < 0.05)
Permutation/8 rounds time: [23.835 ns 23.979 ns 24.109 ns]
change: [-24.968% -24.238% -23.588%] (p = 0.00 < 0.05)
Permutation/12 rounds time: [33.011 ns 33.458 ns 33.882 ns]
change: [-25.656% -24.646% -23.615%] (p = 0.00 < 0.05)
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Use a slightly different substitution implementation that is slightly more efficient. This does require that the function is now strictly seperated in the three layers.
The assembly with
-C opt-level=2shows no weird instructions,permute_12withoutsoft-compactis fully unrolled and from and to arrays is skipped. Withsoft-compatit's not unrolled but does also skip from and to arrays between the iterations.Benchmarks with and without soft-compat are quite similair (to the point I'm guessing I'm not even running it correctly).