| 1 | /// Sign of Y, magnitude of X (f64) |
|---|---|
| 2 | /// |
| 3 | /// Constructs a number with the magnitude (absolute value) of its |
| 4 | /// first argument, `x`, and the sign of its second argument, `y`. |
| 5 | #[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] |
| 6 | pub fn copysign(x: f64, y: f64) -> f64 { |
| 7 | let mut ux: u64 = x.to_bits(); |
| 8 | let uy: u64 = y.to_bits(); |
| 9 | ux &= (!0) >> 1; |
| 10 | ux |= uy & (1 << 63); |
| 11 | f64::from_bits(ux) |
| 12 | } |
| 13 |