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/// Sign of Y, magnitude of X (f32)
///
/// Constructs a number with the magnitude (absolute value) of its
/// first argument, `x`, and the sign of its second argument, `y`.
pub fn copysignf(x: f32, y: f32) -> f32 {
    let mut ux = x.to_bits();
    let uy = y.to_bits();
    ux &= 0x7fffffff;
    ux |= uy & 0x80000000;
    f32::from_bits(ux)
}