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#![feature(test)]
extern crate test;
extern crate fixedbitset;
use test::Bencher;
use fixedbitset::{FixedBitSet};
use std::mem::size_of;
#[inline]
fn iter_ones_using_contains<F: FnMut(usize)>(fb: &FixedBitSet, f: &mut F) {
for bit in 0 .. fb.len() {
if fb.contains(bit) {
f(bit);
}
}
}
#[inline]
fn iter_ones_using_slice_directly<F: FnMut(usize)>(fb: &FixedBitSet, f: &mut F) {
for (block_idx, &block) in fb.as_slice().iter().enumerate() {
let mut bit_pos = block_idx * size_of::<u32>() * 8;
let mut block: u32 = block;
while block != 0 {
if (block & 1) == 1 {
f(bit_pos);
}
block = block >> 1;
bit_pos += 1;
}
}
}
#[bench]
fn bench_iter_ones_using_contains_all_zeros(b: &mut Bencher) {
const N: usize = 1_000_000;
let fb = FixedBitSet::with_capacity(N);
b.iter(|| {
let mut count = 0;
iter_ones_using_contains(&fb, &mut |_bit| count += 1);
count
});
}
#[bench]
fn bench_iter_ones_using_contains_all_ones(b: &mut Bencher) {
const N: usize = 1_000_000;
let mut fb = FixedBitSet::with_capacity(N);
fb.insert_range(..);
b.iter(|| {
let mut count = 0;
iter_ones_using_contains(&fb, &mut |_bit| count += 1);
count
});
}
#[bench]
fn bench_iter_ones_using_slice_directly_all_zero(b: &mut Bencher) {
const N: usize = 1_000_000;
let fb = FixedBitSet::with_capacity(N);
b.iter(|| {
let mut count = 0;
iter_ones_using_slice_directly(&fb, &mut |_bit| count += 1);
count
});
}
#[bench]
fn bench_iter_ones_using_slice_directly_all_ones(b: &mut Bencher) {
const N: usize = 1_000_000;
let mut fb = FixedBitSet::with_capacity(N);
fb.insert_range(..);
b.iter(|| {
let mut count = 0;
iter_ones_using_slice_directly(&fb, &mut |_bit| count += 1);
count
});
}
#[bench]
fn bench_iter_ones_all_zeros(b: &mut Bencher) {
const N: usize = 1_000_000;
let fb = FixedBitSet::with_capacity(N);
b.iter(|| {
let mut count = 0;
for _ in fb.ones() {
count += 1;
}
count
});
}
#[bench]
fn bench_iter_ones_all_ones(b: &mut Bencher) {
const N: usize = 1_000_000;
let mut fb = FixedBitSet::with_capacity(N);
fb.insert_range(..);
b.iter(|| {
let mut count = 0;
for _ in fb.ones() {
count += 1;
}
count
});
}
#[bench]
fn bench_insert_range(b: &mut Bencher) {
const N: usize = 1_000_000;
let mut fb = FixedBitSet::with_capacity(N);
b.iter(|| {
fb.insert_range(..)
});
}
#[bench]
fn bench_insert_range_using_loop(b: &mut Bencher) {
const N: usize = 1_000_000;
let mut fb = FixedBitSet::with_capacity(N);
b.iter(|| {
for i in 0..N {
fb.insert(i);
}
});
}
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