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>99.7% speedup to lookup tables

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Cian Hughes
2023-07-25 10:14:08 +01:00
parent 26e512394e
commit 14d057e4ff
15 changed files with 355 additions and 251 deletions
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10
benches/bench.rs
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@@ -10,19 +10,13 @@ fn pow2_benchmarks(group: &mut BenchmarkGroup<WallTime>, x_f64: &[f64], x_f32: &
b.iter(|| x_f64.iter().map(|&x| black_box(x).fast_pow2()).collect::<Vec<f64>>())
});
group.bench_function("f64_builtin_fn", |b| {
b.iter(|| x_f64.iter().map(|&x| black_box(x).powi(2)).collect::<Vec<f64>>())
});
group.bench_function("f64_builtin_mul", |b| {
b.iter(|| x_f64.iter().map(|&x| black_box(x) * x).collect::<Vec<f64>>())
b.iter(|| x_f64.iter().map(|&x| 2.0f64.powf(black_box(x))).collect::<Vec<f64>>())
});
group.bench_function("f32_fast", |b| {
b.iter(|| x_f32.iter().map(|&x| black_box(x).fast_pow2()).collect::<Vec<f32>>())
});
group.bench_function("f32_builtin_fn", |b| {
b.iter(|| x_f32.iter().map(|&x| black_box(x).powi(2)).collect::<Vec<f32>>())
});
group.bench_function("f32_builtin_mul", |b| {
b.iter(|| x_f32.iter().map(|&x| black_box(x) * x).collect::<Vec<f32>>())
b.iter(|| x_f32.iter().map(|&x| 2.0f32.powf(black_box(x))).collect::<Vec<f32>>())
});
}