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fix for issue #109

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This commit is contained in:
Ken McMillan 2015-05-27 16:05:40 -07:00
parent 534271db08
commit 3d2ef8bb4a
3 changed files with 63 additions and 1 deletions
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24
src/interp/iz3mgr.cpp
View file

@ -616,6 +616,30 @@ void iz3mgr::get_assign_bounds_coeffs(const ast &proof, std::vector<rational>& r
extract_lcd(rats);
}
void iz3mgr::get_gomory_cut_coeffs(const ast &proof, std::vector<ast>& coeffs){
std::vector<rational> rats;
get_gomory_cut_coeffs(proof,rats);
coeffs.resize(rats.size());
for(unsigned i = 0; i < rats.size(); i++){
coeffs[i] = make_int(rats[i]);
}
}
void iz3mgr::get_gomory_cut_coeffs(const ast &proof, std::vector<rational>& rats){
symb s = sym(proof);
int numps = s->get_num_parameters();
rats.resize(numps-2);
for(int i = 2; i < numps; i++){
rational r;
bool ok = s->get_parameter(i).is_rational(r);
if(!ok)
throw "Bad Farkas coefficient";
rats[i-2] = r;
}
abs_rat(rats);
extract_lcd(rats);
}
void iz3mgr::get_assign_bounds_rule_coeffs(const ast &proof, std::vector<ast>& coeffs){
std::vector<rational> rats;
get_assign_bounds_rule_coeffs(proof,rats);

8
src/interp/iz3mgr.h
View file

@ -396,7 +396,7 @@ class iz3mgr {
return UnknownTheory;
}
enum lemma_kind {FarkasKind,Leq2EqKind,Eq2LeqKind,GCDTestKind,AssignBoundsKind,EqPropagateKind,ArithMysteryKind,UnknownKind};
enum lemma_kind {FarkasKind,Leq2EqKind,Eq2LeqKind,GCDTestKind,AssignBoundsKind,EqPropagateKind,GomoryCutKind,ArithMysteryKind,UnknownKind};
lemma_kind get_theory_lemma_kind(const ast &proof){
symb s = sym(proof);
@ -417,6 +417,8 @@ class iz3mgr {
return AssignBoundsKind;
if(foo == "eq-propagate")
return EqPropagateKind;
if(foo == "gomory-cut")
return GomoryCutKind;
return UnknownKind;
}
@ -434,6 +436,10 @@ class iz3mgr {
void get_assign_bounds_rule_coeffs(const ast &proof, std::vector<ast>& rats);
void get_gomory_cut_coeffs(const ast &proof, std::vector<rational>& rats);
void get_gomory_cut_coeffs(const ast &proof, std::vector<ast>& rats);
bool is_farkas_coefficient_negative(const ast &proof, int n);
bool is_true(ast t){

32
src/interp/iz3translate.cpp
View file

@ -1182,6 +1182,31 @@ public:
return res;
}
ast GomoryCutRule2Farkas(const ast &proof, const ast &con, std::vector<Iproof::node> prems){
std::vector<Iproof::node> my_prems = prems;
std::vector<ast> my_coeffs;
std::vector<Iproof::node> my_prem_cons;
get_gomory_cut_coeffs(proof,my_coeffs);
int nargs = num_prems(proof);
if(nargs != (int)(my_coeffs.size()))
throw "bad gomory-cut theory lemma";
for(int i = 0; i < nargs; i++)
my_prem_cons.push_back(conc(prem(proof,i)));
ast my_con = normalize_inequality(sum_inequalities(my_coeffs,my_prem_cons));
Iproof::node hyp = iproof->make_hypothesis(mk_not(my_con));
my_prems.push_back(hyp);
my_coeffs.push_back(make_int("1"));
my_prem_cons.push_back(mk_not(my_con));
Iproof::node res = iproof->make_farkas(mk_false(),my_prems,my_prem_cons,my_coeffs);
ast t = arg(my_con,0);
ast c = arg(my_con,1);
ast d = gcd_of_coefficients(t);
t = z3_simplify(mk_idiv(t,d));
c = z3_simplify(mk_idiv(c,d));
ast cut_con = make(op(my_con),t,c);
return iproof->make_cut_rule(my_con,d,cut_con,res);
}
Iproof::node RewriteClause(Iproof::node clause, const ast &rew){
if(pr(rew) == PR_MONOTONICITY){
int nequivs = num_prems(rew);
@ -1912,6 +1937,13 @@ public:
res = AssignBounds2Farkas(proof,conc(proof));
break;
}
case GomoryCutKind: {
if(args.size() > 0)
res = GomoryCutRule2Farkas(proof, conc(proof), args);
else
throw unsupported();
break;
}
case EqPropagateKind: {
std::vector<ast> prems(nprems);
for(unsigned i = 0; i < nprems; i++)