| /// Sign of Y, magnitude of X (f64) | |
| /// | |
| /// Constructs a number with the magnitude (absolute value) of its | |
| /// first argument, `x`, and the sign of its second argument, `y`. | |
| pub fn copysign(x: f64, y: f64) -> f64 { | |
| let mut ux = x.to_bits(); | |
| let uy = y.to_bits(); | |
| ux &= (!0) >> 1; | |
| ux |= uy & (1 << 63); | |
| f64::from_bits(ux) | |
| } |