softfloat 1.0.0

Pure software floating-point implementation, with `const` and `no_std` support
Documentation 
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use super::F64;

/// 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(crate) const 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)
}