Commit af9a253a authored by Masahiko Sakai's avatar Masahiko Sakai
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.PbSolver.h.swp

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.cproject

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<?fileVersion 4.0.0?>



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.project

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<?xml version="1.0" encoding="UTF-8"?>

<projectDescription>

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	<comment></comment>

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ADTs/FEnv.C

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/******************************************************************************************[FEnv.C]

Copyright (c) 2005-2010, Niklas Een, Niklas Sorensson



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 HOLDERS BE LIABLE FOR ANY CLAIM,

DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT

OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

**************************************************************************************************/



#include "FEnv.h"



namespace FEnv {

    vec<NodeData>       nodes;

    Map<NodeData, int>  uniqueness_table;



    vec<int>            stack;

}



//=================================================================================================





static

bool eval(Formula f, AMap<char>& values, FEnv::CompMap<char>& memo)

{

    if (Const_p(f))

        return !sign(f);

    else if (Atom_p(f))

        return sign(f) ? !values.at(f) : values.at(f);

    else{

        int ret = memo.at(f);

        if (ret == -1){

            if (Bin_p(f)){

                bool l = eval(left(f), values, memo);

                bool r = eval(left(f), values, memo);

                if (op(f) == op_And)

                    ret = l & r;

                else{

                    assert(op(f) == op_Equiv);

                    ret = (l ^ r) ^ 1; }

            }else if (ITE_p(f)){

                bool sel = eval(cond(f), values, memo);

                bool tru = eval(tt  (f), values, memo);

                bool fal = eval(ff  (f), values, memo);

                ret = sel ? tru : fal;

            }else{

                assert(FA_p(f));

                bool x = eval(FA_x(f), values, memo);

                bool y = eval(FA_y(f), values, memo);

                bool c = eval(FA_c(f), values, memo);

                if (isCarry(f))

                    ret = ((int)x + (int) y + (int)c) >= 2;

                else

                    ret = x ^ y ^ c;

            }

            memo.set(f, ret);

        }

        return sign(f) ? !ret : ret;

    }

}





bool eval(Formula f, AMap<char>& values) {

    FEnv::CompMap<char> memo(-1);;

    return eval(f, values, memo); }

ADTs/FEnv.h

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