Function arb_dot_precise 

pub unsafe extern "C" fn arb_dot_precise(
    res: *mut arb_struct,
    initial: *const arb_struct,
    subtract: c_int,
    x: arb_srcptr,
    xstep: slong,
    y: arb_srcptr,
    ystep: slong,
    len: slong,
    prec: slong,
)