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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-06-21 16:00:13 -07:00
parent 6f93ed8dc2
commit 9173306adc
4 changed files with 20 additions and 54 deletions
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15
src/math/polysat/viable.cpp
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@ -46,6 +46,21 @@ namespace polysat {
}
}
void viable::intersect_ule(pvar v, rational const& a, rational const& b, rational const& c, rational const& d, bool is_positive) {
bddv const& x = var2bits(v).var();
// hacky special case
if (a == 1 && b == 0 && c == 0 && d == 0)
// x <= 0
intersect_viable(v, is_positive ? x.all0() : !x.all0());
else {
IF_VERBOSE(10, verbose_stream() << a << "*x + " << b << (is_positive ? " <= " : " > ") << c << "*x + " << d << "\n");
bddv l = a * x + b;
bddv r = c * x + d;
bdd xs = is_positive ? (l <= r) : (l > r);
intersect_viable(v, xs);
}
}
bool viable::has_viable(pvar v) {
return !m_viable[v].is_false();
}