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added mbqi.id option, working on quantifiers in duality

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This commit is contained in:
Ken McMillan 2013-12-10 11:41:25 -08:00
parent a3462ba6aa
commit 56b3406ee5
14 changed files with 409 additions and 33 deletions
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26
src/interp/iz3mgr.cpp
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@ -190,7 +190,7 @@ iz3mgr::ast iz3mgr::make_quant(opr op, const std::vector<ast> &bvs, ast &body){
op == Forall,
names.size(), &types[0], &names[0], abs_body.get(),
0,
symbol(),
symbol("itp"),
symbol(),
0, 0,
0, 0
@ -761,6 +761,19 @@ int iz3mgr::occurs_in(ast var, ast e){
}
bool iz3mgr::solve_arith(const ast &v, const ast &x, const ast &y, ast &res){
if(op(x) == Plus){
int n = num_args(x);
for(int i = 0; i < n; i++){
if(arg(x,i) == v){
res = z3_simplify(make(Sub, y, make(Sub, x, v)));
return true;
}
}
}
return false;
}
// find a controlling equality for a given variable v in a term
// a controlling equality is of the form v = t, which, being
// false would force the formula to have the specifid truth value
@ -774,6 +787,9 @@ iz3mgr::ast iz3mgr::cont_eq(stl_ext::hash_set<ast> &cont_eq_memo, bool truth, as
if(!truth && op(e) == Equal){
if(arg(e,0) == v) return(arg(e,1));
if(arg(e,1) == v) return(arg(e,0));
ast res;
if(solve_arith(v,arg(e,0),arg(e,1),res)) return res;
if(solve_arith(v,arg(e,1),arg(e,0),res)) return res;
}
if((!truth && op(e) == And) || (truth && op(e) == Or)){
int nargs = num_args(e);
@ -836,6 +852,14 @@ iz3mgr::ast iz3mgr::subst(stl_ext::hash_map<ast,ast> &subst_memo,ast e){
// 2) bound variable must be equal to some term -> substitute
iz3mgr::ast iz3mgr::apply_quant(opr quantifier, ast var, ast e){
if((quantifier == Forall && op(e) == And)
|| (quantifier == Exists && op(e) == Or)){
int n = num_args(e);
std::vector<ast> args(n);
for(int i = 0; i < n; i++)
args[i] = apply_quant(quantifier,var,arg(e,i));
return make(op(e),args);
}
if(!occurs_in(var,e))return e;
hash_set<ast> cont_eq_memo;
ast cterm = cont_eq(cont_eq_memo, quantifier == Forall, var, e);