78 lines
1.7 KiB
Rust
78 lines
1.7 KiB
Rust
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extern crate arrayvec;
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#[macro_use] extern crate bencher;
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use std::io::Write;
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use arrayvec::ArrayVec;
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use bencher::Bencher;
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use bencher::black_box;
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fn extend_with_constant(b: &mut Bencher) {
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let mut v = ArrayVec::<u8, 512>::new();
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let cap = v.capacity();
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b.iter(|| {
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v.clear();
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let constant = black_box(1);
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v.extend((0..cap).map(move |_| constant));
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v[511]
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});
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b.bytes = v.capacity() as u64;
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}
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fn extend_with_range(b: &mut Bencher) {
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let mut v = ArrayVec::<u8, 512>::new();
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let cap = v.capacity();
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b.iter(|| {
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v.clear();
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let range = 0..cap;
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v.extend(range.map(|x| black_box(x as _)));
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v[511]
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});
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b.bytes = v.capacity() as u64;
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}
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fn extend_with_slice(b: &mut Bencher) {
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let mut v = ArrayVec::<u8, 512>::new();
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let data = [1; 512];
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b.iter(|| {
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v.clear();
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let iter = data.iter().map(|&x| x);
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v.extend(iter);
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v[511]
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});
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b.bytes = v.capacity() as u64;
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}
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fn extend_with_write(b: &mut Bencher) {
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let mut v = ArrayVec::<u8, 512>::new();
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let data = [1; 512];
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b.iter(|| {
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v.clear();
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v.write(&data[..]).ok();
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v[511]
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});
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b.bytes = v.capacity() as u64;
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}
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fn extend_from_slice(b: &mut Bencher) {
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let mut v = ArrayVec::<u8, 512>::new();
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let data = [1; 512];
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b.iter(|| {
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v.clear();
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v.try_extend_from_slice(&data).ok();
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v[511]
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});
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b.bytes = v.capacity() as u64;
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}
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benchmark_group!(benches,
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extend_with_constant,
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extend_with_range,
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extend_with_slice,
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extend_with_write,
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extend_from_slice
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);
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benchmark_main!(benches);
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