Skip to content

div with differently sized denominators #799

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 10 commits into from
Jun 3, 2025
Merged

div with differently sized denominators #799

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
10 commits
Select commit Hold shift + click to select a range
c31e4bd
Implement `div_rem` for smaller sized denominators
erik-3milabs Mar 31, 2025
d5ecfb0
Implement `div_rem` for larger denominators
erik-3milabs Mar 31, 2025
3ba68da
Clean up `Uint::rem_mixed` test
erik-3milabs Mar 31, 2025
1e5f607
Implement `Uint::div` traits
erik-3milabs Mar 31, 2025
4f07ae4
Implement `Int::div` traits
erik-3milabs Mar 31, 2025
6599d07
Implement `Int::div_uint` traits
erik-3milabs Mar 31, 2025
ec06add
Update `Uint::div` benchmarks
erik-3milabs Mar 31, 2025
026f563
Clean up `bench_division`
erik-3milabs Jun 2, 2025
4bbf257
Annotate if-statement in `Uint::div_rem`
erik-3milabs Jun 2, 2025
8fa31a2
Fix fmt
erik-3milabs Jun 2, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
80 changes: 56 additions & 24 deletions benches/uint.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -219,15 +219,35 @@ fn bench_division(c: &mut Criterion) {
let mut rng = make_rng();
let mut group = c.benchmark_group("wrapping ops");

group.bench_function("div/rem, U256/U128, full size", |b| {
group.bench_function("div/rem, U256/U128", |b| {
b.iter_batched(
|| (U256::random(&mut rng), NonZero::<U128>::random(&mut rng)),
|(x, y)| x.div_rem(&y),
BatchSize::SmallInput,
)
});

group.bench_function("div/rem, U256/U128 (in U256)", |b| {
b.iter_batched(
|| {
let x = U256::random(&mut rng);
let y_half = U128::random(&mut rng);
let y: U256 = (y_half, U128::ZERO).into();
(x, NonZero::new(y).unwrap())
},
|(x, y)| black_box(x.div_rem(&y)),
|(x, y)| x.div_rem(&y),
BatchSize::SmallInput,
)
});

group.bench_function("div/rem, U256/U128 (in U512)", |b| {
b.iter_batched(
|| {
let x = U256::random(&mut rng);
let y: U512 = U128::random(&mut rng).resize();
(x, NonZero::new(y).unwrap())
},
|(x, y)| x.div_rem(&y),
BatchSize::SmallInput,
)
});
Expand All @@ -239,20 +259,39 @@ fn bench_division(c: &mut Criterion) {
let y: U256 = (U128::MAX, U128::ZERO).into();
(x, NonZero::new(y).unwrap())
},
|(x, y)| black_box(x.div_rem_vartime(&y)),
|(x, y)| x.div_rem_vartime(&y),
BatchSize::SmallInput,
)
});

group.bench_function("rem, U256/U128", |b| {
b.iter_batched(
|| (U256::random(&mut rng), NonZero::<U128>::random(&mut rng)),
|(x, y)| x.rem(&y),
BatchSize::SmallInput,
)
});

group.bench_function("rem, U256/U128 (in U256)", |b| {
b.iter_batched(
|| {
let x = U256::random(&mut rng);
let y: U256 = U128::random(&mut rng).resize();
(x, NonZero::new(y).unwrap())
},
|(x, y)| x.rem(&y),
BatchSize::SmallInput,
)
});

group.bench_function("rem, U256/U128, full size", |b| {
group.bench_function("rem, U256/U128 (in U512)", |b| {
b.iter_batched(
|| {
let x = U256::random(&mut rng);
let y_half = U128::random(&mut rng);
let y: U256 = (y_half, U128::ZERO).into();
let y: U512 = U128::random(&mut rng).resize();
(x, NonZero::new(y).unwrap())
},
|(x, y)| black_box(x.rem(&y)),
|(x, y)| x.rem(&y),
BatchSize::SmallInput,
)
});
Expand All @@ -264,7 +303,7 @@ fn bench_division(c: &mut Criterion) {
let y: U256 = (U128::MAX, U128::ZERO).into();
(x, NonZero::new(y).unwrap())
},
|(x, y)| black_box(x.rem_vartime(&y)),
|(x, y)| x.rem_vartime(&y),
BatchSize::SmallInput,
)
});
Expand All @@ -276,7 +315,7 @@ fn bench_division(c: &mut Criterion) {
let y: U256 = (U128::MAX, U128::ZERO).into();
(x_lo, x_hi, NonZero::new(y).unwrap())
},
|(x_lo, x_hi, y)| black_box(Uint::rem_wide_vartime((x_lo, x_hi), &y)),
|(x_lo, x_hi, y)| Uint::rem_wide_vartime((x_lo, x_hi), &y),
BatchSize::SmallInput,
)
});
Expand All @@ -289,35 +328,28 @@ fn bench_division(c: &mut Criterion) {
let y = U256::from_word(y_small.0);
(x, NonZero::new(y).unwrap())
},
|(x, y)| black_box(x.div_rem(&y)),
|(x, y)| x.div_rem(&y),
BatchSize::SmallInput,
)
});

group.bench_function("div/rem, U256/Limb, single limb", |b| {
b.iter_batched(
|| {
let x = U256::random(&mut rng);
let y = Limb::random(&mut rng);
(x, NonZero::new(y).unwrap())
},
|(x, y)| black_box(x.div_rem_limb(y)),
|| (U256::random(&mut rng), NonZero::<Limb>::random(&mut rng)),
|(x, y)| x.div_rem_limb(y),
BatchSize::SmallInput,
)
});

group.bench_function("div/rem, U256/Limb, single limb with reciprocal", |b| {
b.iter_batched(
|| {
let x = U256::random(&mut rng);
let mut y = Limb::random(&mut rng);
if y == Limb::ZERO {
y = Limb::ONE;
}
let r = Reciprocal::new(NonZero::new(y).unwrap());
(x, r)
(
U256::random(&mut rng),
Reciprocal::new(NonZero::<Limb>::random(&mut rng)),
)
},
|(x, r)| black_box(x.div_rem_limb_with_reciprocal(&r)),
|(x, r)| x.div_rem_limb_with_reciprocal(&r),
BatchSize::SmallInput,
)
});
Expand Down
Loading