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Avoid non-linear arithmetic in qgen

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This commit is contained in:
Arie Gurfinkel 2018-06-28 16:50:43 -04:00
parent 5e87d7c4a3
commit 9b578083f5
1 changed files with 51 additions and 0 deletions
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51
src/muz/spacer/spacer_quant_generalizer.cpp
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@ -80,6 +80,51 @@ struct index_lt_proc : public std::binary_function<app*, app *, bool> {
}
};
struct has_nlira_functor {
struct found{};
ast_manager &m;
arith_util u;
has_nlira_functor(ast_manager &_m) : m(_m), u(m) {}
void operator()(var *) {}
void operator()(quantifier *) {}
void operator()(app *n) {
family_id fid = n->get_family_id();
if (fid != u.get_family_id()) return;
switch(n->get_decl_kind()) {
case OP_MUL:
if (n->get_num_args() != 2)
throw found();
if (!u.is_numeral(n->get_arg(0)) && !u.is_numeral(n->get_arg(1)))
throw found();
return;
case OP_IDIV: case OP_DIV: case OP_REM: case OP_MOD:
if (!u.is_numeral(n->get_arg(1)))
throw found();
return;
default:
return;
}
return;
}
};
bool has_nlira(expr_ref_vector &v) {
has_nlira_functor fn(v.m());
expr_fast_mark1 visited;
try {
for (expr *e : v)
quick_for_each_expr(fn, visited, e);
}
catch (has_nlira_functor::found e) {
return true;
}
return false;
}
}
namespace spacer {
@ -461,9 +506,15 @@ bool lemma_quantifier_generalizer::generalize (lemma_ref &lemma, app *term) {
mk_abs_cube(lemma, term, var, gnd_cube, abs_cube, lb, ub, stride);
if (abs_cube.empty()) {return false;}
if (has_nlira(abs_cube)) {
TRACE("spacer_qgen",
tout << "non-linear expression: " << abs_cube << "\n";);
return false;
}
TRACE("spacer_qgen",
tout << "abs_cube is: " << mk_and(abs_cube) << "\n";
tout << "term: " << mk_pp(term, m) << "\n";
tout << "lb = ";
if (lb) tout << mk_pp(lb, m); else tout << "none";
tout << "\n";