Subversion Repositories bluespec_md6

//----------------------------------------------------------------------//

// The MIT License

//

// Copyright (c) 2008 Kermin Fleming, kfleming@mit.edu

//

// Permission is hereby granted, free of charge, to any person

// obtaining a copy of this software and associated documentation

// files (the "Software"), to deal in the Software without

// restriction, including without limitation the rights to use,

// copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the

// Software is furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be

// included in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

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//----------------------------------------------------------------------//

import MD6Parameters::*;

import MD6Types::*;

import CompressionFunctionTypes::*;

// The following are magic, externally defined parameters in MD6

// Other important parameters are derived from them.

// These parameters are used solely within the compression

// function.

function MD6Word s0();

  return truncateLSB(64'h0123456789abcdef);

endfunction

function MD6Word sStar();

  return truncateLSB(64'h7311c2812425cfa0);

endfunction

// These tables are all of size 16. MD6 does not have a definition for

// Non-size 16 value of MD6_c

ShiftFactor c64ShiftR[16] = {12,6,7,11,13,7,15,14,7,2,12,11,10,13,5,10};

ShiftFactor c64ShiftL[16] = {9,31,5,15,8,29,2,6,15,27,9,15,16,9,24,11};

ShiftFactor c32ShiftR[16] = {7,13,1,8,15,3,16,13,2,3,13,9,7,10,2,4};

ShiftFactor c32ShiftL[16] = {15,12,3,16,10,7,5,9,4,9,16,12,11,5,1,13};

ShiftFactor c16ShiftR[16] = {7,4,1,7,2,1,5,7,2,1,7,1,2,7,7,8};

ShiftFactor c16ShiftL[16] = {3,5,2,2,4,5,3,4,6,5,4,2,3,2,6,5};

ShiftFactor c8ShiftR[16] = {1,1,2,1,2,3,2,3,1,3,2,2,1,1,4,2};

ShiftFactor c8ShiftL[16] = {3,2,4,3,3,4,1,1,2,4,4,3,4,2,3,3};

// This is the sqrt(6) vector value.  It should probably be longer than this

Bit#(TMul#(16,64)) vectorQ = {

               64'h8b30ed2e9956c6a0,

               64'h0d6f3522631effcb,

               64'h3b72066c7a1552ac,

               64'hc878c1dd04c4b633,

               64'h995ad1178bd25c31,

               64'h8af8671d3fb50c2c,

               64'h3e7f16bb88222e0d,

               64'h4ad12aae0a6d6031,

               64'h54e5ed5b88e3775d,

               64'h1f8ccf6823058f8a,

               64'h0cd0d63b2c30bc41,

               64'hdd2e76cba691e5bf,

               64'he8fb23908d9f06f1,

               64'hb60450e9ef68b7c1,

               64'h6432286434aac8e7,

               64'h7311c2812425cfa0};

//This might well be enormous.

function MD6Word getQWord(Bit#(TLog#(MD6_q)) index);

   Bit#(TLog#(TMul#(MD6_q,MD6_WordWidth))) baseIndex = fromInteger(valueof(MD6_WordWidth))*zeroExtend(index);

   return vectorQ[(baseIndex+fromInteger(valueof(MD6_WordWidth)-1)):baseIndex];

endfunction

function MD6Word extractWord(Bit#(n) bitVector, Bit#(m) index)

  provisos(

            Add#(a,m,TAdd#(m,TLog#(MD6_WordWidth))));

   Bit#(TAdd#(m,TLog#(MD6_WordWidth))) baseIndex = fromInteger(valueof(MD6_WordWidth))*zeroExtend(index);

   return bitVector[(baseIndex+fromInteger(valueof(MD6_WordWidth)-1)):baseIndex];

endfunction