fp t19;
fp t17;
fp t20;
fp t18;
      t19 = x*y;
      t17 = t19-y;
      t20 = x-t17;
      t18 = t19-x;
      coeffs_dz->coeff_0_0_0 = RATIONAL(-1.0,1.0)+t20;
      coeffs_dz->coeff_p1_0_0 = t18;
      coeffs_dz->coeff_0_p1_0 = t17;
      coeffs_dz->coeff_p1_p1_0 = -t19;
      coeffs_dz->coeff_0_0_p1 = RATIONAL(1.0,1.0)-t20;
      coeffs_dz->coeff_p1_0_p1 = -t18;
      coeffs_dz->coeff_0_p1_p1 = -t17;
      coeffs_dz->coeff_p1_p1_p1 = t19;