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Polysat: conflict resolution updates (#5534)

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* variable elimination / saturation sketch

* conflict resolution updates
This commit is contained in:
Jakob Rath 2021-09-03 19:17:06 +02:00 • committed by GitHub
parent dc547510db
commit 9f387f5738
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14 changed files with 343 additions and 294 deletions
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24
src/math/polysat/variable_elimination.cpp
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@ -12,8 +12,32 @@ Author:
--*/
#include "math/polysat/variable_elimination.h"
#include "math/polysat/solver.h"
#include <algorithm>
namespace polysat {
bool ve_reduction::perform(solver& s, pvar v, conflict_core& core) {
// without any further hints, we just do core reduction with the stronger premise "C contains a c' that evaluates to false",
// and kick out all other constraints.
auto pred = [&s, v](signed_constraint c) -> bool {
return !c->contains_var(v) && c.is_currently_false(s);
};
auto it = std::find_if(core.begin(), core.end(), pred);
if (it != core.end()) {
signed_constraint c = *it;
core.reset();
core.set(c);
// core.insert(c);
// core.set_needs_model(true);
return true;
}
return false;
}
bool ve_forbidden_intervals::perform(solver& s, pvar v, conflict_core& core) {
NOT_IMPLEMENTED_YET();
return false;
}
}