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One more case for ule_constraint::is_always_false

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This commit is contained in:
Jakob Rath 2022-09-29 18:22:31 +02:00
parent 6218931dde
commit 8242069ba6
3 changed files with 6 additions and 2 deletions
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4
src/math/polysat/ule_constraint.cpp
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@ -70,7 +70,7 @@ namespace {
return;
}
// p <= -1 --> 0 <= 0
if (rhs.is_val() && rhs.val() == rhs.manager().max_value()) {
if (rhs.is_max()) {
lhs = 0, rhs = 0;
return;
}
@ -202,6 +202,8 @@ namespace polysat {
return true; // 0 > ... is always false
if (lhs == rhs)
return true; // p > p
if (rhs.is_max())
return true; // p > -1
if (lhs.is_one() && rhs.is_never_zero())
return true; // 1 > p implies p == 0
return lhs.is_val() && rhs.is_val() && lhs.val() <= rhs.val();

2
src/math/polysat/ule_constraint.h
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@ -27,6 +27,7 @@ namespace polysat {
ule_constraint(constraint_manager& m, pdd const& l, pdd const& r);
static void simplify(bool& is_positive, pdd& lhs, pdd& rhs);
static bool is_always_false(bool is_positive, pdd const& lhs, pdd const& rhs);
public:
~ule_constraint() override {}
@ -35,7 +36,6 @@ namespace polysat {
static std::ostream& display(std::ostream& out, lbool status, pdd const& lhs, pdd const& rhs);
std::ostream& display(std::ostream& out, lbool status) const override;
std::ostream& display(std::ostream& out) const override;
static bool is_always_false(bool is_positive, pdd const& lhs, pdd const& rhs);
bool is_always_false(bool is_positive) const override;
bool is_currently_false(solver& s, bool is_positive) const override;
bool is_currently_false(solver& s, assignment_t const& sub, bool is_positive) const override;