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use rand::Rng;
use test::{black_box, Bencher};
macro_rules! int_log_bench {
($t:ty, $predictable:ident, $random:ident, $random_small:ident) => {
#[bench]
fn $predictable(bench: &mut Bencher) {
bench.iter(|| {
for n in 0..(<$t>::BITS / 8) {
for i in 1..=(100 as $t) {
let x = black_box(i << (n * 8));
black_box(x.log10());
}
}
});
}
#[bench]
fn $random(bench: &mut Bencher) {
let mut rng = crate::bench_rng();
/* Exponentially distributed random numbers from the whole range of the type. */
let numbers: Vec<$t> = (0..256)
.map(|_| {
let x = rng.gen::<$t>() >> rng.gen_range(0, <$t>::BITS);
if x != 0 { x } else { 1 }
})
.collect();
bench.iter(|| {
for x in &numbers {
black_box(black_box(x).log10());
}
});
}
#[bench]
fn $random_small(bench: &mut Bencher) {
let mut rng = crate::bench_rng();
/* Exponentially distributed random numbers from the range 0..256. */
let numbers: Vec<$t> = (0..256)
.map(|_| {
let x = (rng.gen::<u8>() >> rng.gen_range(0, u8::BITS)) as $t;
if x != 0 { x } else { 1 }
})
.collect();
bench.iter(|| {
for x in &numbers {
black_box(black_box(x).log10());
}
});
}
};
}
int_log_bench! {u8, u8_log10_predictable, u8_log10_random, u8_log10_random_small}
int_log_bench! {u16, u16_log10_predictable, u16_log10_random, u16_log10_random_small}
int_log_bench! {u32, u32_log10_predictable, u32_log10_random, u32_log10_random_small}
int_log_bench! {u64, u64_log10_predictable, u64_log10_random, u64_log10_random_small}
int_log_bench! {u128, u128_log10_predictable, u128_log10_random, u128_log10_random_small}
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