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/*

 * Copyright 2013, Homer Hsing <homer.hsing@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/* round constant */

module rconst(i, rc);

    input      [23:0] i;

    output reg [63:0] rc;

    always @ (i)

      begin

        rc = 0;

        rc[0] = i[0] | i[4] | i[5] | i[6] | i[7] | i[10] | i[12] | i[13] | i[14] | i[15] | i[20] | i[22];

        rc[1] = i[1] | i[2] | i[4] | i[8] | i[11] | i[12] | i[13] | i[15] | i[16] | i[18] | i[19];

        rc[3] = i[2] | i[4] | i[7] | i[8] | i[9] | i[10] | i[11] | i[12] | i[13] | i[14] | i[18] | i[19] | i[23];

        rc[7] = i[1] | i[2] | i[4] | i[6] | i[8] | i[9] | i[12] | i[13] | i[14] | i[17] | i[20] | i[21];

        rc[15] = i[1] | i[2] | i[3] | i[4] | i[6] | i[7] | i[10] | i[12] | i[14] | i[15] | i[16] | i[18] | i[20] | i[21] | i[23];

        rc[31] = i[3] | i[5] | i[6] | i[10] | i[11] | i[12] | i[19] | i[20] | i[22] | i[23];

        rc[63] = i[2] | i[3] | i[6] | i[7] | i[13] | i[14] | i[15] | i[16] | i[17] | i[19] | i[20] | i[21] | i[23];

      end

endmodule