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#![feature(test)]
#![allow(deprecated)]
extern crate test;
use self::test::Bencher;
use smallvec::{ExtendFromSlice, smallvec, SmallVec};
const VEC_SIZE: usize = 16;
const SPILLED_SIZE: usize = 100;
trait Vector<T>: for<'a> From<&'a [T]> + Extend<T> + ExtendFromSlice<T> {
fn new() -> Self;
fn push(&mut self, val: T);
fn pop(&mut self) -> Option<T>;
fn remove(&mut self, p: usize) -> T;
fn insert(&mut self, n: usize, val: T);
fn from_elem(val: T, n: usize) -> Self;
fn from_elems(val: &[T]) -> Self;
}
impl<T: Copy> Vector<T> for Vec<T> {
fn new() -> Self {
Self::with_capacity(VEC_SIZE)
}
fn push(&mut self, val: T) {
self.push(val)
}
fn pop(&mut self) -> Option<T> {
self.pop()
}
fn remove(&mut self, p: usize) -> T {
self.remove(p)
}
fn insert(&mut self, n: usize, val: T) {
self.insert(n, val)
}
fn from_elem(val: T, n: usize) -> Self {
vec![val; n]
}
fn from_elems(val: &[T]) -> Self {
val.to_owned()
}
}
impl<T: Copy> Vector<T> for SmallVec<[T; VEC_SIZE]> {
fn new() -> Self {
Self::new()
}
fn push(&mut self, val: T) {
self.push(val)
}
fn pop(&mut self) -> Option<T> {
self.pop()
}
fn remove(&mut self, p: usize) -> T {
self.remove(p)
}
fn insert(&mut self, n: usize, val: T) {
self.insert(n, val)
}
fn from_elem(val: T, n: usize) -> Self {
smallvec![val; n]
}
fn from_elems(val: &[T]) -> Self {
SmallVec::from_slice(val)
}
}
macro_rules! make_benches {
($typ:ty { $($b_name:ident => $g_name:ident($($args:expr),*),)* }) => {
$(
#[bench]
fn $b_name(b: &mut Bencher) {
$g_name::<$typ>($($args,)* b)
}
)*
}
}
make_benches! {
SmallVec<[u64; VEC_SIZE]> {
bench_push => gen_push(SPILLED_SIZE as _),
bench_push_small => gen_push(VEC_SIZE as _),
bench_insert_push => gen_insert_push(SPILLED_SIZE as _),
bench_insert_push_small => gen_insert_push(VEC_SIZE as _),
bench_insert => gen_insert(SPILLED_SIZE as _),
bench_insert_small => gen_insert(VEC_SIZE as _),
bench_remove => gen_remove(SPILLED_SIZE as _),
bench_remove_small => gen_remove(VEC_SIZE as _),
bench_extend => gen_extend(SPILLED_SIZE as _),
bench_extend_small => gen_extend(VEC_SIZE as _),
bench_from_iter => gen_from_iter(SPILLED_SIZE as _),
bench_from_iter_small => gen_from_iter(VEC_SIZE as _),
bench_from_slice => gen_from_slice(SPILLED_SIZE as _),
bench_from_slice_small => gen_from_slice(VEC_SIZE as _),
bench_extend_from_slice => gen_extend_from_slice(SPILLED_SIZE as _),
bench_extend_from_slice_small => gen_extend_from_slice(VEC_SIZE as _),
bench_macro_from_elem => gen_from_elem(SPILLED_SIZE as _),
bench_macro_from_elem_small => gen_from_elem(VEC_SIZE as _),
bench_pushpop => gen_pushpop(),
}
}
make_benches! {
Vec<u64> {
bench_push_vec => gen_push(SPILLED_SIZE as _),
bench_push_vec_small => gen_push(VEC_SIZE as _),
bench_insert_push_vec => gen_insert_push(SPILLED_SIZE as _),
bench_insert_push_vec_small => gen_insert_push(VEC_SIZE as _),
bench_insert_vec => gen_insert(SPILLED_SIZE as _),
bench_insert_vec_small => gen_insert(VEC_SIZE as _),
bench_remove_vec => gen_remove(SPILLED_SIZE as _),
bench_remove_vec_small => gen_remove(VEC_SIZE as _),
bench_extend_vec => gen_extend(SPILLED_SIZE as _),
bench_extend_vec_small => gen_extend(VEC_SIZE as _),
bench_from_iter_vec => gen_from_iter(SPILLED_SIZE as _),
bench_from_iter_vec_small => gen_from_iter(VEC_SIZE as _),
bench_from_slice_vec => gen_from_slice(SPILLED_SIZE as _),
bench_from_slice_vec_small => gen_from_slice(VEC_SIZE as _),
bench_extend_from_slice_vec => gen_extend_from_slice(SPILLED_SIZE as _),
bench_extend_from_slice_vec_small => gen_extend_from_slice(VEC_SIZE as _),
bench_macro_from_elem_vec => gen_from_elem(SPILLED_SIZE as _),
bench_macro_from_elem_vec_small => gen_from_elem(VEC_SIZE as _),
bench_pushpop_vec => gen_pushpop(),
}
}
fn gen_push<V: Vector<u64>>(n: u64, b: &mut Bencher) {
#[inline(never)]
fn push_noinline<V: Vector<u64>>(vec: &mut V, x: u64) {
vec.push(x);
}
b.iter(|| {
let mut vec = V::new();
for x in 0..n {
push_noinline(&mut vec, x);
}
vec
});
}
fn gen_insert_push<V: Vector<u64>>(n: u64, b: &mut Bencher) {
#[inline(never)]
fn insert_push_noinline<V: Vector<u64>>(vec: &mut V, x: u64) {
vec.insert(x as usize, x);
}
b.iter(|| {
let mut vec = V::new();
for x in 0..n {
insert_push_noinline(&mut vec, x);
}
vec
});
}
fn gen_insert<V: Vector<u64>>(n: u64, b: &mut Bencher) {
#[inline(never)]
fn insert_noinline<V: Vector<u64>>(vec: &mut V, p: usize, x: u64) {
vec.insert(p, x)
}
b.iter(|| {
let mut vec = V::new();
// Always insert at position 0 so that we are subject to shifts of
// many different lengths.
vec.push(0);
for x in 0..n {
insert_noinline(&mut vec, 0, x);
}
vec
});
}
fn gen_remove<V: Vector<u64>>(n: usize, b: &mut Bencher) {
#[inline(never)]
fn remove_noinline<V: Vector<u64>>(vec: &mut V, p: usize) -> u64 {
vec.remove(p)
}
b.iter(|| {
let mut vec = V::from_elem(0, n as _);
for _ in 0..n {
remove_noinline(&mut vec, 0);
}
});
}
fn gen_extend<V: Vector<u64>>(n: u64, b: &mut Bencher) {
b.iter(|| {
let mut vec = V::new();
vec.extend(0..n);
vec
});
}
fn gen_from_iter<V: Vector<u64>>(n: u64, b: &mut Bencher) {
let v: Vec<u64> = (0..n).collect();
b.iter(|| {
let vec = V::from(&v);
vec
});
}
fn gen_from_slice<V: Vector<u64>>(n: u64, b: &mut Bencher) {
let v: Vec<u64> = (0..n).collect();
b.iter(|| {
let vec = V::from_elems(&v);
vec
});
}
fn gen_extend_from_slice<V: Vector<u64>>(n: u64, b: &mut Bencher) {
let v: Vec<u64> = (0..n).collect();
b.iter(|| {
let mut vec = V::new();
vec.extend_from_slice(&v);
vec
});
}
fn gen_pushpop<V: Vector<u64>>(b: &mut Bencher) {
#[inline(never)]
fn pushpop_noinline<V: Vector<u64>>(vec: &mut V, x: u64) -> Option<u64> {
vec.push(x);
vec.pop()
}
b.iter(|| {
let mut vec = V::new();
for x in 0..SPILLED_SIZE as _ {
pushpop_noinline(&mut vec, x);
}
vec
});
}
fn gen_from_elem<V: Vector<u64>>(n: usize, b: &mut Bencher) {
b.iter(|| {
let vec = V::from_elem(42, n);
vec
});
}
#[bench]
fn bench_insert_many(b: &mut Bencher) {
#[inline(never)]
fn insert_many_noinline<I: IntoIterator<Item = u64>>(
vec: &mut SmallVec<[u64; VEC_SIZE]>,
index: usize,
iterable: I,
) {
vec.insert_many(index, iterable)
}
b.iter(|| {
let mut vec = SmallVec::<[u64; VEC_SIZE]>::new();
insert_many_noinline(&mut vec, 0, 0..SPILLED_SIZE as _);
insert_many_noinline(&mut vec, 0, 0..SPILLED_SIZE as _);
vec
});
}
#[bench]
fn bench_insert_from_slice(b: &mut Bencher) {
let v: Vec<u64> = (0..SPILLED_SIZE as _).collect();
b.iter(|| {
let mut vec = SmallVec::<[u64; VEC_SIZE]>::new();
vec.insert_from_slice(0, &v);
vec.insert_from_slice(0, &v);
vec
});
}
#[bench]
fn bench_macro_from_list(b: &mut Bencher) {
b.iter(|| {
let vec: SmallVec<[u64; 16]> = smallvec![
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 24, 32, 36, 0x40, 0x80,
0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000, 0x10000, 0x20000, 0x40000,
0x80000, 0x100000,
];
vec
});
}
#[bench]
fn bench_macro_from_list_vec(b: &mut Bencher) {
b.iter(|| {
let vec: Vec<u64> = vec![
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 24, 32, 36, 0x40, 0x80,
0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000, 0x10000, 0x20000, 0x40000,
0x80000, 0x100000,
];
vec
});
}