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anf translation

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-01-05 21:09:52 -08:00
parent c473cd78d8
commit 2acab46388
3 changed files with 12 additions and 5 deletions
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9
src/sat/sat_anf_simplifier.cpp
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@ -372,9 +372,7 @@ namespace sat {
void anf_simplifier::add_bin(solver::bin_clause const& b, pdd_solver& ps) {
auto& m = ps.get_manager();
auto v = lit2pdd(b.first);
auto w = lit2pdd(b.second);
dd::pdd p = (v | w) + 1;
dd::pdd p = (lit2pdd(b.first) | lit2pdd(b.second)) ^ true;
ps.add(p);
TRACE("anf_simplifier", tout << "bin: " << b.first << " " << b.second << " : " << p << "\n";);
}
@ -384,7 +382,7 @@ namespace sat {
auto& m = ps.get_manager();
dd::pdd p = m.zero();
for (literal l : c) p |= lit2pdd(l);
p = p + 1;
p = p ^ true;
ps.add(p);
TRACE("anf_simplifier", tout << "clause: " << c << " : " << p << "\n";);
}
@ -408,7 +406,8 @@ namespace sat {
void anf_simplifier::add_if(literal head, literal c, literal th, literal el, pdd_solver& ps) {
auto& m = ps.get_manager();
dd::pdd p = lit2pdd(head) ^ (lit2pdd(c) & lit2pdd(th)) ^ (~lit2pdd(c) & lit2pdd(el));
dd::pdd cond = lit2pdd(c);
dd::pdd p = lit2pdd(head) ^ (cond & lit2pdd(th)) ^ (~cond & lit2pdd(el));
ps.add(p);
TRACE("anf_simplifier", tout << "ite: " << head << " == " << c << "?" << th << ":" << el << " poly : " << p << "\n";);
}