Function _nfloat_vec_dot_rev 

pub unsafe extern "C" fn _nfloat_vec_dot_rev(
    res: nfloat_ptr,
    initial: nfloat_srcptr,
    subtract: c_int,
    x: nfloat_srcptr,
    y: nfloat_srcptr,
    len: slong,
    ctx: *mut gr_ctx_struct,
) -> c_int