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minato.hh
1 // -*- coding: utf-8 -*-
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3 // Développement de l'Epita (LRDE).
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5 // département Systèmes Répartis Coopératifs (SRC), Université Pierre
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22 
23 #pragma once
24 
25 #include <spot/misc/common.hh>
26 #include <bddx.h>
27 #include <stack>
28 
29 namespace spot
30 {
37 
51  class SPOT_API minato_isop
52  {
53  public:
56  minato_isop(bdd input);
60  minato_isop(bdd input, bdd vars);
67  minato_isop(bdd input_min, bdd input_max, bool);
70  bdd next();
71 
72  private:
74  struct local_vars
75  {
76  // If you are following the paper, f_min and f_max correspond
77  // to the pair of BDD functions used to encode the ternary function f
78  // (see Section 3.4).
79  // Also note that f0, f0', and f0'' all share the same _max function.
80  // Likewise for f1, f1', and f1''.
81  bdd f_min, f_max;
82  // Because we need a non-recursive version of the algorithm,
83  // we had to split it in four steps (each step is separated
84  // from the other by a call to ISOP in the original algorithm).
85  enum { FirstStep, SecondStep, ThirdStep, FourthStep } step;
86  // The list of variables to factorize. This is an addition to
87  // the original algorithm.
88  bdd vars;
89  bdd v1;
90  bdd f0_min, f0_max;
91  bdd f1_min, f1_max;
92  bdd g0, g1;
93  local_vars(bdd f_min, bdd f_max, bdd vars)
94  : f_min(f_min), f_max(f_max), step(FirstStep), vars(vars) {}
95  };
96  std::stack<local_vars> todo_;
97  std::stack<bdd> cube_;
98  bdd ret_;
99  };
100 }
Definition: graph.hh:33
Generate an irredundant sum-of-products (ISOP) form of a BDD function.
Definition: minato.hh:51

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