Value pi = create_const_op(M_PI);
    Value log_pi = create_const_op(std::log(M_PI));
    Value log_sqrt_two_pi = create_const_op((std::log(2) + std::log(M_PI)) / 2);
    Value lanczos_gamma_plus_one_half = create_const_op(kLanczosGamma + 0.5);
    Value log_lanczos_gamma_plus_one_half =
        create_const_op(std::log(kLanczosGamma + 0.5));
    Value base_lanczos_coeff = create_const_op(kBaseLanczosCoeff);