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Fix benchmarks in library/core with black_box #107598

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Feb 3, 2023
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Fix benchmarks in library/core with black_box #107598

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40 changes: 26 additions & 14 deletions library/core/benches/char/methods.rs
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Original file line number Diff line number Diff line change
@@ -1,26 +1,26 @@
use test::Bencher;
use test::{black_box, Bencher};

const CHARS: [char; 9] = ['0', 'x', '2', '5', 'A', 'f', '7', '8', '9'];
const RADIX: [u32; 5] = [2, 8, 10, 16, 32];

#[bench]
fn bench_to_digit_radix_2(b: &mut Bencher) {
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(2)).min())
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| black_box(c).to_digit(2)).min())
}

#[bench]
fn bench_to_digit_radix_10(b: &mut Bencher) {
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(10)).min())
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| black_box(c).to_digit(10)).min())
}

#[bench]
fn bench_to_digit_radix_16(b: &mut Bencher) {
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(16)).min())
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| black_box(c).to_digit(16)).min())
}

#[bench]
fn bench_to_digit_radix_36(b: &mut Bencher) {
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(36)).min())
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| black_box(c).to_digit(36)).min())
}

#[bench]
Expand All @@ -31,47 +31,59 @@ fn bench_to_digit_radix_var(b: &mut Bencher) {
.cycle()
.zip(RADIX.iter().cycle())
.take(10_000)
.map(|(c, radix)| c.to_digit(*radix))
.map(|(c, radix)| black_box(c).to_digit(*radix))
.min()
})
}

#[bench]
fn bench_to_ascii_uppercase(b: &mut Bencher) {
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_ascii_uppercase()).min())
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| black_box(c).to_ascii_uppercase()).min())
}

#[bench]
fn bench_to_ascii_lowercase(b: &mut Bencher) {
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_ascii_lowercase()).min())
b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| black_box(c).to_ascii_lowercase()).min())
}

#[bench]
fn bench_ascii_mix_to_uppercase(b: &mut Bencher) {
b.iter(|| (0..=255).cycle().take(10_000).map(|b| char::from(b).to_uppercase()).count())
b.iter(|| {
(0..=255).cycle().take(10_000).map(|b| black_box(char::from(b)).to_uppercase()).count()
})
}

#[bench]
fn bench_ascii_mix_to_lowercase(b: &mut Bencher) {
b.iter(|| (0..=255).cycle().take(10_000).map(|b| char::from(b).to_lowercase()).count())
b.iter(|| {
(0..=255).cycle().take(10_000).map(|b| black_box(char::from(b)).to_lowercase()).count()
})
}

#[bench]
fn bench_ascii_char_to_uppercase(b: &mut Bencher) {
b.iter(|| (0..=127).cycle().take(10_000).map(|b| char::from(b).to_uppercase()).count())
b.iter(|| {
(0..=127).cycle().take(10_000).map(|b| black_box(char::from(b)).to_uppercase()).count()
})
}

#[bench]
fn bench_ascii_char_to_lowercase(b: &mut Bencher) {
b.iter(|| (0..=127).cycle().take(10_000).map(|b| char::from(b).to_lowercase()).count())
b.iter(|| {
(0..=127).cycle().take(10_000).map(|b| black_box(char::from(b)).to_lowercase()).count()
})
}

#[bench]
fn bench_non_ascii_char_to_uppercase(b: &mut Bencher) {
b.iter(|| (128..=255).cycle().take(10_000).map(|b| char::from(b).to_uppercase()).count())
b.iter(|| {
(128..=255).cycle().take(10_000).map(|b| black_box(char::from(b)).to_uppercase()).count()
})
}

#[bench]
fn bench_non_ascii_char_to_lowercase(b: &mut Bencher) {
b.iter(|| (128..=255).cycle().take(10_000).map(|b| char::from(b).to_lowercase()).count())
b.iter(|| {
(128..=255).cycle().take(10_000).map(|b| black_box(char::from(b)).to_lowercase()).count()
})
}
18 changes: 9 additions & 9 deletions library/core/benches/num/flt2dec/strategy/dragon.rs
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Open in desktop
Original file line number Diff line number Diff line change
@@ -1,14 +1,14 @@
use super::super::*;
use core::num::flt2dec::strategy::dragon::*;
use std::mem::MaybeUninit;
use test::Bencher;
use test::{black_box, Bencher};

#[bench]
fn bench_small_shortest(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); MAX_SIG_DIGITS];
b.iter(|| {
format_shortest(&decoded, &mut buf);
format_shortest(black_box(&decoded), &mut buf);
});
}

Expand All @@ -17,7 +17,7 @@ fn bench_big_shortest(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); MAX_SIG_DIGITS];
b.iter(|| {
format_shortest(&decoded, &mut buf);
format_shortest(black_box(&decoded), &mut buf);
});
}

Expand All @@ -26,7 +26,7 @@ fn bench_small_exact_3(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); 3];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -35,7 +35,7 @@ fn bench_big_exact_3(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); 3];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -44,7 +44,7 @@ fn bench_small_exact_12(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); 12];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -53,7 +53,7 @@ fn bench_big_exact_12(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); 12];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -62,7 +62,7 @@ fn bench_small_exact_inf(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); 1024];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -71,6 +71,6 @@ fn bench_big_exact_inf(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); 1024];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}
18 changes: 9 additions & 9 deletions library/core/benches/num/flt2dec/strategy/grisu.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
use super::super::*;
use core::num::flt2dec::strategy::grisu::*;
use std::mem::MaybeUninit;
use test::Bencher;
use test::{black_box, Bencher};

pub fn decode_finite<T: DecodableFloat>(v: T) -> Decoded {
match decode(v).1 {
Expand All @@ -15,7 +15,7 @@ fn bench_small_shortest(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); MAX_SIG_DIGITS];
b.iter(|| {
format_shortest(&decoded, &mut buf);
format_shortest(black_box(&decoded), &mut buf);
});
}

Expand All @@ -24,7 +24,7 @@ fn bench_big_shortest(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); MAX_SIG_DIGITS];
b.iter(|| {
format_shortest(&decoded, &mut buf);
format_shortest(black_box(&decoded), &mut buf);
});
}

Expand All @@ -33,7 +33,7 @@ fn bench_small_exact_3(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); 3];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -42,7 +42,7 @@ fn bench_big_exact_3(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); 3];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -51,7 +51,7 @@ fn bench_small_exact_12(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); 12];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -60,7 +60,7 @@ fn bench_big_exact_12(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); 12];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -69,7 +69,7 @@ fn bench_small_exact_inf(b: &mut Bencher) {
let decoded = decode_finite(3.141592f64);
let mut buf = [MaybeUninit::new(0); 1024];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}

Expand All @@ -78,6 +78,6 @@ fn bench_big_exact_inf(b: &mut Bencher) {
let decoded = decode_finite(f64::MAX);
let mut buf = [MaybeUninit::new(0); 1024];
b.iter(|| {
format_exact(&decoded, &mut buf, i16::MIN);
format_exact(black_box(&decoded), &mut buf, i16::MIN);
});
}