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fix #4359 and regression to #3270

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This commit is contained in:
Nikolaj Bjorner 2020-05-18 12:41:42 -07:00
parent 1c760b04cf
commit 78a4717c06
4 changed files with 37 additions and 29 deletions
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27
src/math/lp/monomial_bounds.cpp
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@ -17,13 +17,11 @@ namespace nla {
common(c),
dep(c->m_intervals.get_dep_intervals()) {}
bool monomial_bounds::operator()() {
bool propagated = false;
void monomial_bounds::operator()() {
for (lpvar v : c().m_to_refine) {
monic const& m = c().emons()[v];
propagated |= propagate(m);
propagate(m);
}
return propagated;
}
/**
@ -88,10 +86,10 @@ namespace nla {
bool monomial_bounds::propagate_value(dep_interval& range, lpvar v, unsigned p) {
SASSERT(p > 0);
if (p == 1)
if (p == 1)
return propagate_value(range, v);
auto val = c().val(v);
val = power(val, p);
auto val_v = c().val(v);
auto val = power(val_v, p);
rational r;
if (dep.is_below(range, val)) {
lp::explanation ex;
@ -101,21 +99,24 @@ namespace nla {
lemma &= ex;
return true;
}
if (rational(dep.upper(range)).root(p, r)) {
{
else if (rational(dep.upper(range)).root(p, r)) {
// v = -2, [-4,-3]^3 < v^3 -> add bound v <= -3
// v = -2, [-1,+1]^2 < v^2 -> add bound v >= -1
if ((p % 2 == 1) || val_v.is_pos()) {
auto le = dep.upper_is_open(range) ? llc::LT : llc::LE;
new_lemma lemma(c(), "propagate value - root case - lower bound of range is below value");
new_lemma lemma(c(), "propagate value - root case - upper bound of range is below value");
lemma &= ex;
lemma |= ineq(v, le, r);
return true;
}
if (p % 2 == 0) {
if (p % 2 == 0 && val_v.is_neg()) {
SASSERT(!r.is_neg());
auto ge = dep.upper_is_open(range) ? llc::GT : llc::GE;
new_lemma lemma(c(), "propagate value - root case - lower bound of range is below value");
new_lemma lemma(c(), "propagate value - root case - upper bound of range is below negative value");
lemma &= ex;
lemma |= ineq(v, ge, -r);
return true;
}
return true;
}
// TBD: add bounds as long as difference to val is above some epsilon.
}

2
src/math/lp/monomial_bounds.h
View file

@ -28,6 +28,6 @@ namespace nla {
bool is_zero(lpvar v) const;
public:
monomial_bounds(core* core);
bool operator()();
void operator()();
};
}