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