1 | use super::{exp2, exp2f, modff}; |
2 | |
3 | const LN10_F32: f32 = 3.32192809488736234787031942948939; |
4 | const LN10_F64: f64 = 3.32192809488736234787031942948939; |
5 | const P10: &[f32] = &[ |
6 | 1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 1e-2, 1e-1, 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, |
7 | ]; |
8 | |
9 | #[cfg_attr (all(test, assert_no_panic), no_panic::no_panic)] |
10 | pub fn exp10f(x: f32) -> f32 { |
11 | let (mut y: f32, n: f32) = modff(x); |
12 | let u: u32 = n.to_bits(); |
13 | /* fabsf(n) < 8 without raising invalid on nan */ |
14 | if (u >> 23 & 0xff) < 0x7f + 3 { |
15 | if y == 0.0 { |
16 | return i!(P10, ((n as isize) + 7) as usize); |
17 | } |
18 | y = exp2f(LN10_F32 * y); |
19 | return y * i!(P10, ((n as isize) + 7) as usize); |
20 | } |
21 | return exp2(LN10_F64 * (x as f64)) as f32; |
22 | } |
23 | |