literalt smt1_propt::land(literalt a, literalt b)
{
if(a==const_literal(true))
return b;
if(b==const_literal(true))
return a;
if(a==const_literal(false))
return const_literal(false);
if(b==const_literal(false))
return const_literal(false);
if(a==b)
return a;
out << "\n";
literalt l=new_variable();
out << ":assumption ; land" << "\n";
out << " (iff " << smt1_literal(l) << " (and";
out << " " << smt1_literal(a);
out << " " << smt1_literal(b);
out << "))" << "\n";
return l;
}
literalt smt1_propt::lselect(literalt a, literalt b, literalt c)
{
if(a==const_literal(true))
return b;
if(a==const_literal(false))
return c;
if(b==c)
return b;
if(a==const_literal(false))
return b;
if(b==const_literal(false))
return a;
if(a==const_literal(true))
return !b;
if(b==const_literal(true))
return !a;
out << "\n";
literalt l=new_variable();
out << ":assumption ; lselect" << "\n";
out << " (iff " << smt1_literal(l) << "(if_then_else "
<< smt1_literal(a) << " " << smt1_literal(b) << " "
<< smt1_literal(c) << ")" << "\n";
return l;
}
literalt smt1_propt::land(const bvt &bv)
{
out << std::endl;
literalt l=new_variable();
out << ":assumption ; land" << std::endl;
out << " (iff " << smt1_literal(l) << " (and";
forall_literals(it, bv)
out << " " << smt1_literal(*it);
out << "))" << std::endl;
return l;
}
literalt smt1_propt::lor(const bvt &bv)
{
out << "\n";
literalt l=new_variable();
out << ":assumption ; lor" << "\n";
out << " (iff " << smt1_literal(l) << " (or";
forall_literals(it, bv)
out << " " << smt1_literal(*it);
out << "))" << "\n";
return l;
}
literalt smt1_propt::new_variable()
{
literalt l;
l.set(_no_variables, false);
_no_variables++;
out << ":extrapreds((" << smt1_literal(l) << "))" << std::endl;
return l;
}
literalt smt1_propt::lxor(literalt a, literalt b)
{
if(a==const_literal(false)) return b;
if(b==const_literal(false)) return a;
if(a==const_literal(true)) return lnot(b);
if(b==const_literal(true)) return lnot(a);
out << std::endl;
literalt l=new_variable();
out << ":assumption ; lxor" << std::endl;
out << " (iff " << smt1_literal(l) << " (xor";
out << " " << smt1_literal(a);
out << " " << smt1_literal(b);
out << "))" << std::endl;
return l;
}
literalt smt1_propt::lxor(const bvt &bv)
{
if(bv.size()==0) return const_literal(false);
if(bv.size()==1) return bv[0];
out << std::endl;
literalt l=new_variable();
out << ":assumption ; lxor" << std::endl;
out << " (iff " << smt1_literal(l) << " (xor";
forall_literals(it, bv)
out << " " << smt1_literal(*it);
out << "))" << std::endl;
return l;
}
void smt1_propt::lcnf(const bvt &bv)
{
out << std::endl;
out << ":assumption ; lcnf" << std::endl;
out << " ";
if(bv.empty())
out << "false ; the empty clause";
else if(bv.size()==1)
out << smt1_literal(bv.front());
else
{
out << "(or";
for(bvt::const_iterator it=bv.begin(); it!=bv.end(); it++)
out << " " << smt1_literal(*it);
out << ")";
}
out << std::endl;
}