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