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Diffstat (limited to 'vendor/libm/src/math/fmax.rs')
| -rw-r--r-- | vendor/libm/src/math/fmax.rs | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/vendor/libm/src/math/fmax.rs b/vendor/libm/src/math/fmax.rs new file mode 100644 index 000000000..22016d11c --- /dev/null +++ b/vendor/libm/src/math/fmax.rs @@ -0,0 +1,13 @@ +#[inline] +#[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 +} |