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Add CUC impl #4

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muellerr merged 28 commits from add_cuc_time_impl into main 2023-01-09 11:14:42 +01:00
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1 changed files with 24 additions and 27 deletions
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51
src/time/cuc.rs
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@ -877,29 +877,39 @@ mod tests {
#[test]
fn fractional_part_formula() {
let fractional_part =
7843137 / (10_u64.pow(9) / fractional_res_to_div(FractionalResolution::FourMs) as u64);
assert_eq!(fractional_part, 2);
fractional_part_from_subsec_ns(FractionalResolution::FourMs, 7843138).unwrap();
assert_eq!(fractional_part.1, 2);
}
#[test]
fn fractional_part_formula_2() {
let fractional_part =
12000000 / (10_u64.pow(9) / fractional_res_to_div(FractionalResolution::FourMs) as u64);
assert_eq!(fractional_part, 3);
fractional_part_from_subsec_ns(FractionalResolution::FourMs, 12000000).unwrap();
assert_eq!(fractional_part.1, 3);
}
#[test]
fn fractional_part_formula_3() {
let one_fraction_with_width_two_in_ns = 10_u64.pow(9) / (2_u32.pow(8 * 2) - 1) as u64;
assert_eq!(one_fraction_with_width_two_in_ns, 15259);
let hundred_fractions_and_some = 100 * one_fraction_with_width_two_in_ns + 7000;
let fractional_part = hundred_fractions_and_some
/ (10_u64.pow(9) / fractional_res_to_div(FractionalResolution::FifteenUs) as u64);
assert_eq!(fractional_part, 100);
let hundred_and_one_fractions = 101 * one_fraction_with_width_two_in_ns;
let fractional_part = hundred_and_one_fractions
/ (10_u64.pow(9) / fractional_res_to_div(FractionalResolution::FifteenUs) as u64);
assert_eq!(fractional_part, 101);
let one_fraction_with_width_two_in_ns =
10_u64.pow(9) as f64 / (2_u32.pow(8 * 2) - 1) as f64;
assert_eq!(one_fraction_with_width_two_in_ns.ceil(), 15260.0);
let hundred_fractions_and_some =
(100.0 * one_fraction_with_width_two_in_ns).floor() as u64 + 7000;
let fractional_part = fractional_part_from_subsec_ns(
FractionalResolution::FifteenUs,
hundred_fractions_and_some,
)
.unwrap();
assert_eq!(fractional_part.1, 100);
// Using exactly 101.0 can yield values which will later be rounded down to 100
let hundred_and_one_fractions =
(101.001 * one_fraction_with_width_two_in_ns).floor() as u64;
let fractional_part = fractional_part_from_subsec_ns(
FractionalResolution::FifteenUs,
hundred_and_one_fractions,
)
.unwrap();
assert_eq!(fractional_part.1, 101);
}
#[test]
@ -934,17 +944,4 @@ mod tests {
// Assert that the maximum resolution can be reached
assert_eq!(fractions.1, 2_u32.pow(3 * 8) - 2);
}
// extern crate test;
// use test::Bencher;
//
// #[bench]
// fn speed_test(b: &mut Bencher) {
// let ns = 10_u32.pow(9) - 1;
// let sec_as_ns = ns + 1;
// let resolution = 2_u32.pow(3 * 8) - 1;
// b.iter(|| {
// ns * 100000 / ((sec_as_ns * 100000 + resolution) / resolution)
// });
// }
}