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add floating point division code
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Robin Müller 2022-12-21 01:17:36 +01:00
parent 14fa1bad92
commit 472bfa9964
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1 changed files with 15 additions and 0 deletions
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15
src/time/cuc.rs
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@ -76,6 +76,8 @@ pub fn fractional_part_from_subsec_ns(
// TODO: Floating point division might actually be faster option, but requires additional // TODO: Floating point division might actually be faster option, but requires additional
// code on small embedded systems.. // code on small embedded systems..
let fractional_part = ns * 100000 / ((sec_as_ns * 100000 + resolution) / resolution); let fractional_part = ns * 100000 / ((sec_as_ns * 100000 + resolution) / resolution);
// Floating point division.
//let fractional_part = (ns as f64 / ((sec_as_ns as f64) / resolution as f64)).floor() as u32;
Some(FractionalPart(res, fractional_part as u32)) Some(FractionalPart(res, fractional_part as u32))
} }
@ -930,4 +932,17 @@ mod tests {
// Assert that the maximum resolution can be reached // Assert that the maximum resolution can be reached
assert_eq!(fractions.1, 2_u32.pow(3 * 8) - 2); 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)
// });
// }
} }