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guard against lemmas that are already true

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-07-15 10:03:31 -07:00
parent 4ecb61aeaa
commit 6c5747a80e
1 changed files with 21 additions and 7 deletions
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28
src/math/lp/nla_grobner.cpp
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@ -121,9 +121,12 @@ namespace nla {
unsigned v = p.var();
if (c().var_is_fixed(v))
return false;
ineq new_eq(v, llc::EQ, rational::zero());
if (c().ineq_holds(new_eq))
return false;
new_lemma lemma(c(), "pdd-eq");
add_dependencies(lemma, eq);
lemma |= ineq(v, llc::EQ, rational::zero());
lemma |= new_eq;
return true;
}
if (p.is_offset()) {
@ -135,9 +138,12 @@ namespace nla {
rational d = lcm(denominator(a), denominator(b));
a *= d;
b *= d;
ineq new_eq(term(a, v), llc::EQ, b);
if (c().ineq_holds(new_eq))
return false;
new_lemma lemma(c(), "pdd-eq");
add_dependencies(lemma, eq);
lemma |= ineq(term(a, v), llc::EQ, b);
lemma |= new_eq;
return true;
}
@ -156,16 +162,24 @@ namespace nla {
return false;
// IF_VERBOSE(0, verbose_stream() << "factored " << q << " : " << vars << "\n");
new_lemma lemma(c(), "pdd-factored");
add_dependencies(lemma, eq);
term t;
while (!q.is_val()) {
t.add_monomial(q.hi().val(), q.var());
q = q.lo();
}
for (auto v : vars)
lemma |= ineq(v, llc::EQ, rational::zero());
lemma |= ineq(t, llc::EQ, -q.val());
vector<ineq> ineqs;
for (auto v : vars)
ineqs.push_back(ineq(v, llc::EQ, rational::zero()));
ineqs.push_back(ineq(t, llc::EQ, -q.val()));
for (auto const& i : ineqs)
if (c().ineq_holds(i))
return false;
new_lemma lemma(c(), "pdd-factored");
add_dependencies(lemma, eq);
for (auto const& i : ineqs)
lemma |= i;
//lemma.display(verbose_stream());
return true;
}