50 const double C8 = 0.707106781186548;  variable
163   output[ 4] = 2*(temp1 * C8);  in butterfly_16x16_dct_1d()
168   output[12] = 2 * (temp1 * C8);  in butterfly_16x16_dct_1d()
170   output[ 2] = 2 * ((step[4] + step[ 5]) * C8);  in butterfly_16x16_dct_1d()
171   output[14] = 2 * ((step[7] - step[ 6]) * C8);  in butterfly_16x16_dct_1d()
184   output[3] = 2 * (temp1 * C8);  in butterfly_16x16_dct_1d()
189   output[13] = 2 * (temp1 * C8);  in butterfly_16x16_dct_1d()
191   output[ 9] = 2 * ((step[10] + step[11]) * C8);  in butterfly_16x16_dct_1d()
202   output[ 7] = 2 * (intermediate[13] * C8);  in butterfly_16x16_dct_1d()
207   output[11] = -2 * (temp1 * C8);  in butterfly_16x16_dct_1d()
212   output[ 5] = 2 * (temp1 * C8);  in butterfly_16x16_dct_1d()