1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
use criterion::{black_box, criterion_group, criterion_main, Criterion};
use multiversion::multiversion;
#[cfg(feature = "std")]
#[multiversion(targets = "simd", dispatcher = "indirect")]
fn indirect_fn(values: &mut [f32]) {
for v in values {
*v *= *v;
}
}
#[cfg(feature = "std")]
#[multiversion(targets = "simd", dispatcher = "direct")]
fn direct_fn(values: &mut [f32]) {
for v in values {
*v *= *v;
}
}
#[multiversion(targets = "simd", dispatcher = "static")]
fn static_fn(values: &mut [f32]) {
for v in values {
*v *= *v;
}
}
fn base_fn(values: &mut [f32]) {
for v in values {
*v *= *v;
}
}
pub fn benchmark_dispatcher(c: &mut Criterion) {
// Don't profile initial feature detection
#[cfg(feature = "std")]
{
indirect_fn(&mut []);
direct_fn(&mut []);
}
for len in &[0, 16, 1000] {
let mut g = c.benchmark_group(format!("{len} elements"));
let mut i = vec![0f32; *len];
#[cfg(feature = "std")]
g.bench_function("indirect dispatcher", |b| {
b.iter(|| indirect_fn(black_box(i.as_mut())))
})
.bench_function("direct dispatcher", |b| {
b.iter(|| direct_fn(black_box(i.as_mut())))
});
g.bench_function("static dispatcher", |b| {
b.iter(|| static_fn(black_box(i.as_mut())))
})
.bench_function("no multiversioning", |b| {
b.iter(|| base_fn(black_box(i.as_mut())))
});
g.finish();
}
}
criterion_group!(benches, benchmark_dispatcher);
criterion_main!(benches);
|
