123   fe ftmp, ftmp2;  in fe_inv()  local
159   fe_mul(ftmp2, e64, e32);  // 2^64 - 2^0  in fe_inv()
161     fe_sqr(ftmp2, ftmp2);  in fe_inv()
163   fe_mul(ftmp2, ftmp2, e16);  // 2^80 - 2^0  in fe_inv()
165     fe_sqr(ftmp2, ftmp2);  in fe_inv()
167   fe_mul(ftmp2, ftmp2, e8);  // 2^88 - 2^0  in fe_inv()
169     fe_sqr(ftmp2, ftmp2);  in fe_inv()
171   fe_mul(ftmp2, ftmp2, e4);  // 2^92 - 2^0  in fe_inv()
172   fe_sqr(ftmp2, ftmp2);  // 2^93 - 2^1  in fe_inv()
173   fe_sqr(ftmp2, ftmp2);  // 2^94 - 2^2  in fe_inv()
174   fe_mul(ftmp2, ftmp2, e2);  // 2^94 - 2^0  in fe_inv()
175   fe_sqr(ftmp2, ftmp2);  // 2^95 - 2^1  in fe_inv()
176   fe_sqr(ftmp2, ftmp2);  // 2^96 - 2^2  in fe_inv()
177   fe_mul(ftmp2, ftmp2, in);  // 2^96 - 3  in fe_inv()
179   fe_mul(out, ftmp2, ftmp);  // 2^256 - 2^224 + 2^192 + 2^96 - 3  in fe_inv()
210   fe delta, gamma, beta, ftmp, ftmp2, tmptmp, alpha, fourbeta;  in point_double()  local
220   fe_add(ftmp2, x_in, delta);  in point_double()
222   fe_add(tmptmp, ftmp2, ftmp2);  in point_double()
223   fe_add(ftmp2, ftmp2, tmptmp);  in point_double()
224   fe_mul(alpha, ftmp, ftmp2);  in point_double()