compiler_builtins/libm/src/math/generic/
fmaximum_num.rs

1/* SPDX-License-Identifier: MIT OR Apache-2.0 */
2//! IEEE 754-2019 `maximumNumber`.
3//!
4//! Per the spec, returns:
5//! - `x` if `x > y`
6//! - `y` if `y > x`
7//! - +0.0 if x and y are zero with opposite signs
8//! - Either `x` or `y` if `x == y` and the signs are the same
9//! - Non-NaN if one operand is NaN
10//! - qNaN if both operands are NaNx
11//!
12//! Excluded from our implementation is sNaN handling.
13
14use crate::support::Float;
15
16#[inline]
17pub fn fmaximum_num<F: Float>(x: F, y: F) -> F {
18    let res = if x > y || y.is_nan() {
19        x
20    } else if y > x || x.is_nan() {
21        y
22    } else if x.is_sign_positive() {
23        x
24    } else {
25        y
26    };
27
28    res.canonicalize()
29}