mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-03 20:23:59 +00:00
674 lines
15 KiB
Rust
674 lines
15 KiB
Rust
use rand::prelude::*;
|
|
use std::iter::{repeat, FromIterator};
|
|
use test::{black_box, Bencher};
|
|
|
|
#[bench]
|
|
fn bench_new(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let v: Vec<u32> = Vec::new();
|
|
assert_eq!(v.len(), 0);
|
|
assert_eq!(v.capacity(), 0);
|
|
v
|
|
})
|
|
}
|
|
|
|
fn do_bench_with_capacity(b: &mut Bencher, src_len: usize) {
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let v: Vec<u32> = Vec::with_capacity(src_len);
|
|
assert_eq!(v.len(), 0);
|
|
assert_eq!(v.capacity(), src_len);
|
|
v
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_with_capacity_0000(b: &mut Bencher) {
|
|
do_bench_with_capacity(b, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_with_capacity_0010(b: &mut Bencher) {
|
|
do_bench_with_capacity(b, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_with_capacity_0100(b: &mut Bencher) {
|
|
do_bench_with_capacity(b, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_with_capacity_1000(b: &mut Bencher) {
|
|
do_bench_with_capacity(b, 1000)
|
|
}
|
|
|
|
fn do_bench_from_fn(b: &mut Bencher, src_len: usize) {
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let dst = (0..src_len).collect::<Vec<_>>();
|
|
assert_eq!(dst.len(), src_len);
|
|
assert!(dst.iter().enumerate().all(|(i, x)| i == *x));
|
|
dst
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_fn_0000(b: &mut Bencher) {
|
|
do_bench_from_fn(b, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_fn_0010(b: &mut Bencher) {
|
|
do_bench_from_fn(b, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_fn_0100(b: &mut Bencher) {
|
|
do_bench_from_fn(b, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_fn_1000(b: &mut Bencher) {
|
|
do_bench_from_fn(b, 1000)
|
|
}
|
|
|
|
fn do_bench_from_elem(b: &mut Bencher, src_len: usize) {
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let dst: Vec<usize> = repeat(5).take(src_len).collect();
|
|
assert_eq!(dst.len(), src_len);
|
|
assert!(dst.iter().all(|x| *x == 5));
|
|
dst
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_elem_0000(b: &mut Bencher) {
|
|
do_bench_from_elem(b, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_elem_0010(b: &mut Bencher) {
|
|
do_bench_from_elem(b, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_elem_0100(b: &mut Bencher) {
|
|
do_bench_from_elem(b, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_elem_1000(b: &mut Bencher) {
|
|
do_bench_from_elem(b, 1000)
|
|
}
|
|
|
|
fn do_bench_from_slice(b: &mut Bencher, src_len: usize) {
|
|
let src: Vec<_> = FromIterator::from_iter(0..src_len);
|
|
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let dst = src.clone()[..].to_vec();
|
|
assert_eq!(dst.len(), src_len);
|
|
assert!(dst.iter().enumerate().all(|(i, x)| i == *x));
|
|
dst
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_slice_0000(b: &mut Bencher) {
|
|
do_bench_from_slice(b, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_slice_0010(b: &mut Bencher) {
|
|
do_bench_from_slice(b, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_slice_0100(b: &mut Bencher) {
|
|
do_bench_from_slice(b, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_slice_1000(b: &mut Bencher) {
|
|
do_bench_from_slice(b, 1000)
|
|
}
|
|
|
|
fn do_bench_from_iter(b: &mut Bencher, src_len: usize) {
|
|
let src: Vec<_> = FromIterator::from_iter(0..src_len);
|
|
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let dst: Vec<_> = FromIterator::from_iter(src.clone());
|
|
assert_eq!(dst.len(), src_len);
|
|
assert!(dst.iter().enumerate().all(|(i, x)| i == *x));
|
|
dst
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_iter_0000(b: &mut Bencher) {
|
|
do_bench_from_iter(b, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_iter_0010(b: &mut Bencher) {
|
|
do_bench_from_iter(b, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_iter_0100(b: &mut Bencher) {
|
|
do_bench_from_iter(b, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_from_iter_1000(b: &mut Bencher) {
|
|
do_bench_from_iter(b, 1000)
|
|
}
|
|
|
|
fn do_bench_extend(b: &mut Bencher, dst_len: usize, src_len: usize) {
|
|
let dst: Vec<_> = FromIterator::from_iter(0..dst_len);
|
|
let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len);
|
|
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let mut dst = dst.clone();
|
|
dst.extend(src.clone());
|
|
assert_eq!(dst.len(), dst_len + src_len);
|
|
assert!(dst.iter().enumerate().all(|(i, x)| i == *x));
|
|
dst
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_0000_0000(b: &mut Bencher) {
|
|
do_bench_extend(b, 0, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_0000_0010(b: &mut Bencher) {
|
|
do_bench_extend(b, 0, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_0000_0100(b: &mut Bencher) {
|
|
do_bench_extend(b, 0, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_0000_1000(b: &mut Bencher) {
|
|
do_bench_extend(b, 0, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_0010_0010(b: &mut Bencher) {
|
|
do_bench_extend(b, 10, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_0100_0100(b: &mut Bencher) {
|
|
do_bench_extend(b, 100, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_1000_1000(b: &mut Bencher) {
|
|
do_bench_extend(b, 1000, 1000)
|
|
}
|
|
|
|
fn do_bench_extend_from_slice(b: &mut Bencher, dst_len: usize, src_len: usize) {
|
|
let dst: Vec<_> = FromIterator::from_iter(0..dst_len);
|
|
let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len);
|
|
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let mut dst = dst.clone();
|
|
dst.extend_from_slice(&src);
|
|
assert_eq!(dst.len(), dst_len + src_len);
|
|
assert!(dst.iter().enumerate().all(|(i, x)| i == *x));
|
|
dst
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_recycle(b: &mut Bencher) {
|
|
let mut data = vec![0; 1000];
|
|
|
|
b.iter(|| {
|
|
let tmp = std::mem::replace(&mut data, Vec::new());
|
|
let mut to_extend = black_box(Vec::new());
|
|
to_extend.extend(tmp.into_iter());
|
|
data = black_box(to_extend);
|
|
});
|
|
|
|
black_box(data);
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_from_slice_0000_0000(b: &mut Bencher) {
|
|
do_bench_extend_from_slice(b, 0, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_from_slice_0000_0010(b: &mut Bencher) {
|
|
do_bench_extend_from_slice(b, 0, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_from_slice_0000_0100(b: &mut Bencher) {
|
|
do_bench_extend_from_slice(b, 0, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_from_slice_0000_1000(b: &mut Bencher) {
|
|
do_bench_extend_from_slice(b, 0, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_from_slice_0010_0010(b: &mut Bencher) {
|
|
do_bench_extend_from_slice(b, 10, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_from_slice_0100_0100(b: &mut Bencher) {
|
|
do_bench_extend_from_slice(b, 100, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_extend_from_slice_1000_1000(b: &mut Bencher) {
|
|
do_bench_extend_from_slice(b, 1000, 1000)
|
|
}
|
|
|
|
fn do_bench_clone(b: &mut Bencher, src_len: usize) {
|
|
let src: Vec<usize> = FromIterator::from_iter(0..src_len);
|
|
|
|
b.bytes = src_len as u64;
|
|
|
|
b.iter(|| {
|
|
let dst = src.clone();
|
|
assert_eq!(dst.len(), src_len);
|
|
assert!(dst.iter().enumerate().all(|(i, x)| i == *x));
|
|
dst
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_0000(b: &mut Bencher) {
|
|
do_bench_clone(b, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_0010(b: &mut Bencher) {
|
|
do_bench_clone(b, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_0100(b: &mut Bencher) {
|
|
do_bench_clone(b, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_1000(b: &mut Bencher) {
|
|
do_bench_clone(b, 1000)
|
|
}
|
|
|
|
fn do_bench_clone_from(b: &mut Bencher, times: usize, dst_len: usize, src_len: usize) {
|
|
let dst: Vec<_> = FromIterator::from_iter(0..src_len);
|
|
let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len);
|
|
|
|
b.bytes = (times * src_len) as u64;
|
|
|
|
b.iter(|| {
|
|
let mut dst = dst.clone();
|
|
|
|
for _ in 0..times {
|
|
dst.clone_from(&src);
|
|
assert_eq!(dst.len(), src_len);
|
|
assert!(dst.iter().enumerate().all(|(i, x)| dst_len + i == *x));
|
|
}
|
|
dst
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0000_0000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 0, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0000_0010(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 0, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0000_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 0, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0000_1000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 0, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0010_0010(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 10, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0100_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 100, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_1000_1000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 1000, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0010_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 10, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0100_1000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 100, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0010_0000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 10, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_0100_0010(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 100, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_01_1000_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 1, 1000, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0000_0000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 0, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0000_0010(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 0, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0000_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 0, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0000_1000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 0, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0010_0010(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 10, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0100_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 100, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_1000_1000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 1000, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0010_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 10, 100)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0100_1000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 100, 1000)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0010_0000(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 10, 0)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_0100_0010(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 100, 10)
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_clone_from_10_1000_0100(b: &mut Bencher) {
|
|
do_bench_clone_from(b, 10, 1000, 100)
|
|
}
|
|
|
|
macro_rules! bench_in_place {
|
|
($($fname:ident, $type:ty, $count:expr, $init:expr);*) => {
|
|
$(
|
|
#[bench]
|
|
fn $fname(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let src: Vec<$type> = black_box(vec![$init; $count]);
|
|
let mut sink = src.into_iter()
|
|
.enumerate()
|
|
.map(|(idx, e)| idx as $type ^ e)
|
|
.collect::<Vec<$type>>();
|
|
black_box(sink.as_mut_ptr())
|
|
});
|
|
}
|
|
)+
|
|
};
|
|
}
|
|
|
|
bench_in_place![
|
|
bench_in_place_xxu8_0010_i0, u8, 10, 0;
|
|
bench_in_place_xxu8_0100_i0, u8, 100, 0;
|
|
bench_in_place_xxu8_1000_i0, u8, 1000, 0;
|
|
bench_in_place_xxu8_0010_i1, u8, 10, 1;
|
|
bench_in_place_xxu8_0100_i1, u8, 100, 1;
|
|
bench_in_place_xxu8_1000_i1, u8, 1000, 1;
|
|
bench_in_place_xu32_0010_i0, u32, 10, 0;
|
|
bench_in_place_xu32_0100_i0, u32, 100, 0;
|
|
bench_in_place_xu32_1000_i0, u32, 1000, 0;
|
|
bench_in_place_xu32_0010_i1, u32, 10, 1;
|
|
bench_in_place_xu32_0100_i1, u32, 100, 1;
|
|
bench_in_place_xu32_1000_i1, u32, 1000, 1;
|
|
bench_in_place_u128_0010_i0, u128, 10, 0;
|
|
bench_in_place_u128_0100_i0, u128, 100, 0;
|
|
bench_in_place_u128_1000_i0, u128, 1000, 0;
|
|
bench_in_place_u128_0010_i1, u128, 10, 1;
|
|
bench_in_place_u128_0100_i1, u128, 100, 1;
|
|
bench_in_place_u128_1000_i1, u128, 1000, 1
|
|
];
|
|
|
|
#[bench]
|
|
fn bench_in_place_recycle(b: &mut test::Bencher) {
|
|
let mut data = vec![0; 1000];
|
|
|
|
b.iter(|| {
|
|
let tmp = std::mem::replace(&mut data, Vec::new());
|
|
data = black_box(
|
|
tmp.into_iter()
|
|
.enumerate()
|
|
.map(|(idx, e)| idx.wrapping_add(e))
|
|
.fuse()
|
|
.peekable()
|
|
.collect::<Vec<usize>>(),
|
|
);
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_in_place_zip_recycle(b: &mut test::Bencher) {
|
|
let mut data = vec![0u8; 1000];
|
|
let mut rng = rand::thread_rng();
|
|
let mut subst = vec![0u8; 1000];
|
|
rng.fill_bytes(&mut subst[..]);
|
|
|
|
b.iter(|| {
|
|
let tmp = std::mem::replace(&mut data, Vec::new());
|
|
let mangled = tmp
|
|
.into_iter()
|
|
.zip(subst.iter().copied())
|
|
.enumerate()
|
|
.map(|(i, (d, s))| d.wrapping_add(i as u8) ^ s)
|
|
.collect::<Vec<_>>();
|
|
assert_eq!(mangled.len(), 1000);
|
|
data = black_box(mangled);
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_in_place_zip_iter_mut(b: &mut test::Bencher) {
|
|
let mut data = vec![0u8; 256];
|
|
let mut rng = rand::thread_rng();
|
|
let mut subst = vec![0u8; 1000];
|
|
rng.fill_bytes(&mut subst[..]);
|
|
|
|
b.iter(|| {
|
|
data.iter_mut().enumerate().for_each(|(i, d)| {
|
|
*d = d.wrapping_add(i as u8) ^ subst[i];
|
|
});
|
|
});
|
|
|
|
black_box(data);
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
struct Droppable(usize);
|
|
|
|
impl Drop for Droppable {
|
|
fn drop(&mut self) {
|
|
black_box(self);
|
|
}
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_in_place_collect_droppable(b: &mut test::Bencher) {
|
|
let v: Vec<Droppable> = std::iter::repeat_with(|| Droppable(0)).take(1000).collect();
|
|
b.iter(|| {
|
|
v.clone()
|
|
.into_iter()
|
|
.skip(100)
|
|
.enumerate()
|
|
.map(|(i, e)| Droppable(i ^ e.0))
|
|
.collect::<Vec<_>>()
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_chain_collect(b: &mut test::Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| data.iter().cloned().chain([1].iter().cloned()).collect::<Vec<_>>());
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_chain_chain_collect(b: &mut test::Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| {
|
|
data.iter()
|
|
.cloned()
|
|
.chain([1].iter().cloned())
|
|
.chain([2].iter().cloned())
|
|
.collect::<Vec<_>>()
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_nest_chain_chain_collect(b: &mut test::Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| {
|
|
data.iter().cloned().chain([1].iter().chain([2].iter()).cloned()).collect::<Vec<_>>()
|
|
});
|
|
}
|
|
|
|
pub fn example_plain_slow(l: &[u32]) -> Vec<u32> {
|
|
let mut result = Vec::with_capacity(l.len());
|
|
result.extend(l.iter().rev());
|
|
result
|
|
}
|
|
|
|
pub fn map_fast(l: &[(u32, u32)]) -> Vec<u32> {
|
|
let mut result = Vec::with_capacity(l.len());
|
|
for i in 0..l.len() {
|
|
unsafe {
|
|
*result.get_unchecked_mut(i) = l[i].0;
|
|
result.set_len(i);
|
|
}
|
|
}
|
|
result
|
|
}
|
|
|
|
const LEN: usize = 16384;
|
|
|
|
#[bench]
|
|
fn bench_range_map_collect(b: &mut test::Bencher) {
|
|
b.iter(|| (0..LEN).map(|_| u32::default()).collect::<Vec<_>>());
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_chain_extend_ref(b: &mut test::Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| {
|
|
let mut v = Vec::<u32>::with_capacity(data.len() + 1);
|
|
v.extend(data.iter().chain([1].iter()));
|
|
v
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_chain_extend_value(b: &mut test::Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| {
|
|
let mut v = Vec::<u32>::with_capacity(data.len() + 1);
|
|
v.extend(data.iter().cloned().chain(Some(1)));
|
|
v
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_rev_1(b: &mut test::Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| {
|
|
let mut v = Vec::<u32>::new();
|
|
v.extend(data.iter().rev());
|
|
v
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_rev_2(b: &mut test::Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| example_plain_slow(&data));
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_map_regular(b: &mut test::Bencher) {
|
|
let data = black_box([(0, 0); LEN]);
|
|
b.iter(|| {
|
|
let mut v = Vec::<u32>::new();
|
|
v.extend(data.iter().map(|t| t.1));
|
|
v
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_map_fast(b: &mut test::Bencher) {
|
|
let data = black_box([(0, 0); LEN]);
|
|
b.iter(|| map_fast(&data));
|
|
}
|