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