Function _nfloat_sub_1 

pub unsafe extern "C" fn _nfloat_sub_1(
    res: nfloat_ptr,
    x0: ulong,
    xexp: slong,
    xsgnbit: c_int,
    y0: ulong,
    delta: slong,
    ctx: *mut gr_ctx_struct,
) -> c_int