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trying to prevent quantifier in interp (leq2eq rule)

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Ken McMillan 2014-05-21 13:30:54 -07:00
parent 01c6fe39ab
commit 06b79cd9ea
1 changed files with 28 additions and 6 deletions
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34
src/interp/iz3proof_itp.cpp
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@ -779,6 +779,22 @@ class iz3proof_itp_impl : public iz3proof_itp {
ast Bcond = my_implies(Bproves1,my_and(Aproves1,z3_simplify(ineq2)));
// if(!is_true(Aproves1) || !is_true(Bproves1))
// std::cout << "foo!\n";;
if(y == make_int(rational(0)) && op(x) == Plus && num_args(x) == 2){
if(get_term_type(arg(x,0)) == LitA){
ast iter = z3_simplify(make(Plus,arg(x,0),get_ineq_rhs(xleqy)));
ast rewrite1 = make_rewrite(LitA,pos_add(0,top_pos),Acond,make(Equal,arg(x,0),iter));
iter = make(Plus,iter,arg(x,1));
ast rewrite2 = make_rewrite(LitB,top_pos,Bcond,make(Equal,iter,y));
return chain_cons(chain_cons(mk_true(),rewrite1),rewrite2);
}
if(get_term_type(arg(x,1)) == LitA){
ast iter = z3_simplify(make(Plus,arg(x,1),get_ineq_rhs(xleqy)));
ast rewrite1 = make_rewrite(LitA,pos_add(1,top_pos),Acond,make(Equal,arg(x,1),iter));
iter = make(Plus,arg(x,0),iter);
ast rewrite2 = make_rewrite(LitB,top_pos,Bcond,make(Equal,iter,y));
return chain_cons(chain_cons(mk_true(),rewrite1),rewrite2);
}
}
if(get_term_type(x) == LitA){
ast iter = z3_simplify(make(Plus,x,get_ineq_rhs(xleqy)));
ast rewrite1 = make_rewrite(LitA,top_pos,Acond,make(Equal,x,iter));
@ -1036,6 +1052,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
coeff = argpos ? make_int(rational(-1)) : make_int(rational(1));
break;
case Not:
coeff = make_int(rational(-1));
case Plus:
break;
case Times:
@ -2590,12 +2607,17 @@ class iz3proof_itp_impl : public iz3proof_itp {
break;
default: { // mixed equality
if(get_term_type(x) == LitMixed || get_term_type(y) == LitMixed){
// std::cerr << "WARNING: mixed term in leq2eq\n";
std::vector<ast> lits;
lits.push_back(con);
lits.push_back(make(Not,xleqy));
lits.push_back(make(Not,yleqx));
return make_axiom(lits);
if(y == make_int(rational(0)) && op(x) == Plus && num_args(x) == 2){
// std::cerr << "WARNING: untested case in leq2eq\n";
}
else {
// std::cerr << "WARNING: mixed term in leq2eq\n";
std::vector<ast> lits;
lits.push_back(con);
lits.push_back(make(Not,xleqy));
lits.push_back(make(Not,yleqx));
return make_axiom(lits);
}
}
std::vector<ast> conjs; conjs.resize(3);
conjs[0] = mk_not(con);