bluss
23128275ee
The benchmark was optimized out totally. We think of that as a good sign, the new extend became transparent to the compiler and we had to get smarter in how to fool it.
45 lines
1003 B
Rust
45 lines
1003 B
Rust
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extern crate arrayvec;
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#[macro_use] extern crate bencher;
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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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v.extend((0..cap).map(|_| 1));
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v[0]
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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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v.extend((0..cap).map(|x| x as _));
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v[0]
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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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v.extend(black_box(data.iter()).cloned());
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v[0]
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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, extend_with_constant, extend_with_range, extend_with_slice);
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benchmark_main!(benches);
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