1pub fn change(pct: f64, signed: bool) -> String {
2 if signed {
3 format!("{:>+6}%", signed_short(pct * 1e2))
4 } else {
5 format!("{:>6}%", short(pct * 1e2))
6 }
7}
8
9pub fn time(ns: f64) -> String {
10 if ns < 1.0 {
11 format!("{:>6} ps", short(ns * 1e3))
12 } else if ns < 10f64.powi(3) {
13 format!("{:>6} ns", short(ns))
14 } else if ns < 10f64.powi(6) {
15 format!("{:>6} ┬Ás", short(ns / 1e3))
16 } else if ns < 10f64.powi(9) {
17 format!("{:>6} ms", short(ns / 1e6))
18 } else {
19 format!("{:>6} s", short(ns / 1e9))
20 }
21}
22
23pub fn short(n: f64) -> String {
24 if n < 10.0 {
25 format!("{:.4}", n)
26 } else if n < 100.0 {
27 format!("{:.3}", n)
28 } else if n < 1000.0 {
29 format!("{:.2}", n)
30 } else if n < 10000.0 {
31 format!("{:.1}", n)
32 } else {
33 format!("{:.0}", n)
34 }
35}
36
37fn signed_short(n: f64) -> String {
38 let n_abs = n.abs();
39
40 if n_abs < 10.0 {
41 format!("{:+.4}", n)
42 } else if n_abs < 100.0 {
43 format!("{:+.3}", n)
44 } else if n_abs < 1000.0 {
45 format!("{:+.2}", n)
46 } else if n_abs < 10000.0 {
47 format!("{:+.1}", n)
48 } else {
49 format!("{:+.0}", n)
50 }
51}
52
53pub fn iter_count(iterations: u64) -> String {
54 if iterations < 10_000 {
55 format!("{} iterations", iterations)
56 } else if iterations < 1_000_000 {
57 format!("{:.0}k iterations", (iterations as f64) / 1000.0)
58 } else if iterations < 10_000_000 {
59 format!("{:.1}M iterations", (iterations as f64) / (1000.0 * 1000.0))
60 } else if iterations < 1_000_000_000 {
61 format!("{:.0}M iterations", (iterations as f64) / (1000.0 * 1000.0))
62 } else if iterations < 10_000_000_000 {
63 format!(
64 "{:.1}B iterations",
65 (iterations as f64) / (1000.0 * 1000.0 * 1000.0)
66 )
67 } else {
68 format!(
69 "{:.0}B iterations",
70 (iterations as f64) / (1000.0 * 1000.0 * 1000.0)
71 )
72 }
73}
74
75pub fn integer(n: f64) -> String {
76 format!("{}", n as u64)
77}
78
79#[cfg(test)]
80mod test {
81 use super::*;
82
83 #[test]
84 fn short_max_len() {
85 let mut float = 1.0;
86 while float < 999_999.9 {
87 let string = short(float);
88 println!("{}", string);
89 assert!(string.len() <= 6);
90 float *= 2.0;
91 }
92 }
93
94 #[test]
95 fn signed_short_max_len() {
96 let mut float = -1.0;
97 while float > -999_999.9 {
98 let string = signed_short(float);
99 println!("{}", string);
100 assert!(string.len() <= 7);
101 float *= 2.0;
102 }
103 }
104}
105