| use super::{exp2, exp2f, modff}; |
| |
| const LN10_F32: f32 = 3.32192809488736234787031942948939; |
| const LN10_F64: f64 = 3.32192809488736234787031942948939; |
| const P10: &[f32] = &[ |
| 1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 1e-2, 1e-1, 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, |
| ]; |
| |
| pub fn exp10f(x: f32) -> f32 { |
| let (mut y, n) = modff(x); |
| let u = n.to_bits(); |
| /* fabsf(n) < 8 without raising invalid on nan */ |
| if (u >> 23 & 0xff) < 0x7f + 3 { |
| if y == 0.0 { |
| return P10[((n as isize) + 7) as usize]; |
| } |
| y = exp2f(LN10_F32 * y); |
| return y * P10[((n as isize) + 7) as usize]; |
| } |
| return exp2(LN10_F64 * (x as f64)) as f32; |
| } |