def get_installed_use(cp, use="USE"):
    '''
    .. versionadded:: 2015.8.0

    Gets the installed USE flags from the VARDB.

    @type: cp: string
    @param cp: cat/pkg
    @type use: string
    @param use: 1 of ["USE", "PKGUSE"]
    @rtype list
    @returns [] or the list of IUSE flags
    '''
    portage = _get_portage()
    cpv = _get_cpv(cp)
    return portage.db[portage.root]["vartree"].dbapi.aux_get(cpv, [use])[0].split()