stackvec 0.0.2

A crate to use stack-allocated Vectors (performance and/or no-std)
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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

// $ cargo +nightly bench --features nightly
#![cfg(all(test, feature = "nightly"))]
#![feature(test)]

extern crate stackvec;
use ::stackvec::prelude::*;

extern crate test;
use ::test::{
	// black_box,
	Bencher,
};

// #[inline(always)] fn black_box<T> (x: T) -> T { x }

#[bench]
fn stackvec_extend_by_ref(benchmark: &mut Bencher)
{
    benchmark.iter(|| {
        for n in 0 .. (0x400 - 6) {
        	let mut vec = StackVec::<[_; 0x400]>::new();
        	vec.extend(
        		Iterator::chain(
			    	(0 .. n).map(|x| x * x),
			    	b"Shrewk".iter().map(|&b| b as u16),
				)
				.by_ref()
	        );
	    }
    });
}

#[bench]
fn vec_extend_by_ref(benchmark: &mut Bencher)
{
    benchmark.iter(|| {
        for n in 0 .. (0x400 - 6) {
        	let mut vec = Vec::with_capacity(0x400);
	        vec.extend(
	        	Iterator::chain(
			    	(0 .. n).map(|x| x * x),
			    	b"Shrewk".iter().map(|&b| b as u16),
				)
				.by_ref()
	        );
    	}
    });
}

#[bench]
fn stackvec_extend(benchmark: &mut Bencher)
{
    benchmark.iter(|| {
        for n in 0 .. (0x400 - 6) {
        	let mut vec = StackVec::<[_; 0x400]>::new();
        	vec.extend(
        		Iterator::chain(
			    	(0 .. n).map(|x| x * x),
			    	b"Shrewk".iter().map(|&b| b as u16),
				)
	        );
	    }
    });
}

#[bench]
fn vec_extend(benchmark: &mut Bencher)
{
    benchmark.iter(|| {
        for n in 0 .. (0x400 - 6) {
        	let mut vec = Vec::with_capacity(0x400);
	        vec.extend(
	        	Iterator::chain(
			    	(0 .. n).map(|x| x * x),
			    	b"Shrewk".iter().map(|&b| b as u16),
				)
	        );
    	}
    });
}