| 1 | /* SPDX-License-Identifier: MIT OR Apache-2.0 */ |
| 2 | //! IEEE 754-2011 `maxNum`. This has been superseded by IEEE 754-2019 `maximumNumber`. |
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| 3 | //! |
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| 4 | //! Per the spec, returns the canonicalized result of: |
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| 5 | //! - `x` if `x > y` |
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| 6 | //! - `y` if `y > x` |
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| 7 | //! - The other number if one is NaN |
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| 8 | //! - Otherwise, either `x` or `y`, canonicalized |
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| 9 | //! - -0.0 and +0.0 may be disregarded (unlike newer operations) |
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| 10 | //! |
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| 11 | //! Excluded from our implementation is sNaN handling. |
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| 12 | //! |
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| 13 | //! More on the differences: [link]. |
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| 14 | //! |
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| 15 | //! [link]: https://grouper.ieee.org/groups/msc/ANSI_IEEE-Std-754-2019/background/minNum_maxNum_Removal_Demotion_v3.pdf |
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| 16 | |
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| 17 | use crate::support::Float; |
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| 18 | |
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| 19 | #[inline ] |
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| 20 | pub fn fmax<F: Float>(x: F, y: F) -> F { |
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| 21 | let res: F = if x.is_nan() || x < y { y } else { x }; |
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| 22 | // Canonicalize |
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| 23 | res * F::ONE |
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| 24 | } |
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| 25 | |
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