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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)
    }

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