1 | #[cfg_attr (all(test, assert_no_panic), no_panic::no_panic)] |
2 | pub fn fmax(x: f64, y: f64) -> f64 { |
3 | // IEEE754 says: maxNum(x, y) is the canonicalized number y if x < y, x if y < x, the |
4 | // canonicalized number if one operand is a number and the other a quiet NaN. Otherwise it |
5 | // is either x or y, canonicalized (this means results might differ among implementations). |
6 | // When either x or y is a signalingNaN, then the result is according to 6.2. |
7 | // |
8 | // Since we do not support sNaN in Rust yet, we do not need to handle them. |
9 | // FIXME(nagisa): due to https://bugs.llvm.org/show_bug.cgi?id=33303 we canonicalize by |
10 | // multiplying by 1.0. Should switch to the `canonicalize` when it works. |
11 | (if x.is_nan() || x < y { y } else { x }) * 1.0 |
12 | } |
13 | |