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more viable scaffolding

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-06-22 20:55:56 -07:00
parent 8f0c408c0a
commit b9719768a0
2 changed files with 17 additions and 6 deletions
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2
src/math/polysat/viable.cpp
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@ -157,7 +157,7 @@ namespace polysat {
#if POLYSAT_LOGGING_ENABLED
void viable::log() {
// only for small problems
for (pvar v = 0; v < std::min(10u, m_viable.size()); ++v)
for (pvar v = 0; v < std::min(10u, m_viable_bdd.size()); ++v)
log(v);
}

21
src/math/polysat/viable.h
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@ -30,6 +30,9 @@ namespace polysat {
// replace BDDs by viable sets that emulate affine relations.
// viable_set has an interval of feasible values.
// it also can use ternary bit-vectors.
// or we could also just use a vector of lbool instead of ternary bit-vectors
// updating them at individual positions is relatively cheap instead of copying the
// vectors every time a range is narrowed.
//
class viable_set : public mod_interval<rational> {
unsigned m_num_bits;
@ -49,16 +52,17 @@ namespace polysat {
};
class viable {
typedef dd::bdd bdd;
solver& s;
#if NEW_VIABLE
vector<viable_set> m_viable; // future representation of viable values
#else
typedef dd::bdd bdd;
dd::bdd_manager m_bdd;
scoped_ptr_vector<dd::fdd> m_bits;
vector<bdd> m_viable_bdd; // set of viable values.
vector<std::pair<pvar, bdd>> m_viable_trail;
vector<viable_set> m_viable; // future representation of viable values
/**
* Register all values that are not contained in vals as non-viable.
*/
@ -67,18 +71,25 @@ namespace polysat {
dd::bdd_manager& get_bdd() { return m_bdd; }
dd::fdd const& sz2bits(unsigned sz);
dd::fdd const& var2bits(pvar v);
#endif
public:
viable(solver& s);
void push(unsigned num_bits) {
m_viable_bdd.push_back(m_bdd.mk_true());
#if NEW_VIABLE
m_viable.push_back(viable_set(num_bits));
#else
m_viable_bdd.push_back(m_bdd.mk_true());
#endif
}
void pop() {
m_viable_bdd.pop_back();
#if NEW_VIABLE
m_viable.pop_back();
#else
m_viable_bdd.pop_back();
#endif
}
void push_viable(pvar v);