mpn_add_1
mpn_add_1 (prodp + vsize, tp + vsize, vsize, cy);
mpn_add_1 (prodp + vsize, tspace + vsize, usize, cy);
mpn_add_1 (prodp + hsize + size, prodp + hsize + size, hsize, cy);
mpn_add_1 (prodp + size, prodp + size, size, 1);
mpn_add_1 (prodp + hsize + size, prodp + hsize + size, hsize, cy);
mpn_add_1 (prodp + size, prodp + size, size, 1);
mpn_add_1 (prodp + vsize, tp + vsize, vsize, cy);
mpn_add_1 (prodp + vsize, tspace + vsize, usize, cy);
mp_limb_t mpn_add_1 _PROTO ((mp_ptr, mp_srcptr, mp_size_t, mp_limb_t));
mpn_add_1 (res_ptr, s1_ptr, s1_size, s2_limb)
cy_limb = mpn_add_1 (res_ptr + s2_size,