blob: 8aef90442c0b7ddfbd193565078e5758cdad0839 (
plain)
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
|
module math
// nextafter32 returns the next representable f32 value after x towards y.
//
// special cases are:
// nextafter32(x, x) = x
// nextafter32(nan, y) = nan
// nextafter32(x, nan) = nan
pub fn nextafter32(x f32, y f32) f32 {
mut r := f32(0.0)
if is_nan(f64(x)) || is_nan(f64(y)) {
r = f32(nan())
} else if x == y {
r = x
} else if x == 0 {
r = f32(copysign(f64(f32_from_bits(1)), f64(y)))
} else if (y > x) == (x > 0) {
r = f32_from_bits(f32_bits(x) + 1)
} else {
r = f32_from_bits(f32_bits(x) - 1)
}
return r
}
// nextafter returns the next representable f64 value after x towards y.
//
// special cases are:
// nextafter(x, x) = x
// nextafter(nan, y) = nan
// nextafter(x, nan) = nan
pub fn nextafter(x f64, y f64) f64 {
mut r := 0.0
if is_nan(x) || is_nan(y) {
r = nan()
} else if x == y {
r = x
} else if x == 0 {
r = copysign(f64_from_bits(1), y)
} else if (y > x) == (x > 0) {
r = f64_from_bits(f64_bits(x) + 1)
} else {
r = f64_from_bits(f64_bits(x) - 1)
}
return r
}
|
