{{alias}}( x, y )
    Computes `x - nπ/2 = r`.

    The function returns `n` and stores the remainder `r` as the two numbers
    `y[0]` and `y[1]`, such that `y[0] + y[1] = r`.

    For input values larger than `2^20 * π/2` in magnitude, the function only
    returns the last three binary digits of `n` and not the full result.

    Parameters
    ----------
    x: number
        Input value.

    y: Array|TypedArray|Object
        Remainder elements.

    Returns
    -------
    n: integer
        Factor of `π/2`.

    Examples
    --------
    > var y = [ 0.0, 0.0 ];
    > var n = {{alias}}( 128.0, y )
    81
    > var y1 = y[ 0 ]
    ~0.765
    > var y2 = y[ 1 ]
    ~3.618e-17


    See Also
    --------