This crate needs nightly. (for feature(asm))
OS: Ubuntu 18.04, CPU: AMD Ryzen 7 2700X, rustc 1.50.0-nightly (bb178237c 2020-12-25)
```
reference::mulmod_u64 time: [23.242 ns 23.255 ns 23.267 ns]
change: [+0.6678% +0.7357% +0.8097%] (p = 0.00 < 0.05)
Change within noise threshold.
Found 1 outliers among 100 measurements (1.00%)
1 (1.00%) high mild
mulmod_u64 time: [10.262 ns 10.270 ns 10.279 ns]
change: [-0.0325% +0.0948% +0.2124%] (p = 0.15 > 0.05)
No change in performance detected.
Found 7 outliers among 100 measurements (7.00%)
2 (2.00%) low mild
4 (4.00%) high mild
1 (1.00%) high severe
reference::mod_u128u64 time: [36.692 ns 36.708 ns 36.724 ns]
change: [-0.9907% -0.9083% -0.8310%] (p = 0.00 < 0.05)
Change within noise threshold.
mod_u128u64 time: [13.935 ns 13.943 ns 13.951 ns]
change: [-1.1197% -1.0431% -0.9694%] (p = 0.00 < 0.05)
Change within noise threshold.
```