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add blast method for ite terms

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-11-04 13:33:02 -08:00
parent 53d365bc44
commit 89989627d0
10 changed files with 369 additions and 103 deletions
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63
src/muz/pdr/pdr_util.cpp
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@ -1030,68 +1030,6 @@ namespace pdr {
fml = m.mk_and(conjs.size(), conjs.c_ptr());
}
//
// (f (if c1 (if c2 e1 e2) e3) b c) ->
// (if c1 (if c2 (f e1 b c)
class ite_hoister {
ast_manager& m;
public:
ite_hoister(ast_manager& m): m(m) {}
br_status mk_app_core(func_decl* f, unsigned num_args, expr* const* args, expr_ref& result) {
if (m.is_ite(f)) {
return BR_FAILED;
}
for (unsigned i = 0; i < num_args; ++i) {
expr* c, *t, *e;
if (!m.is_bool(args[i]) && m.is_ite(args[i], c, t, e)) {
expr_ref e1(m), e2(m);
ptr_vector<expr> args1(num_args, args);
args1[i] = t;
e1 = m.mk_app(f, num_args, args1.c_ptr());
if (t == e) {
result = e1;
return BR_REWRITE1;
}
args1[i] = e;
e2 = m.mk_app(f, num_args, args1.c_ptr());
result = m.mk_app(f, num_args, args);
result = m.mk_ite(c, e1, e2);
return BR_REWRITE3;
}
}
return BR_FAILED;
}
};
struct ite_hoister_cfg: public default_rewriter_cfg {
ite_hoister m_r;
bool rewrite_patterns() const { return false; }
br_status reduce_app(func_decl * f, unsigned num, expr * const * args, expr_ref & result, proof_ref & result_pr) {
return m_r.mk_app_core(f, num, args, result);
}
ite_hoister_cfg(ast_manager & m, params_ref const & p):m_r(m) {}
};
class ite_hoister_star : public rewriter_tpl<ite_hoister_cfg> {
ite_hoister_cfg m_cfg;
public:
ite_hoister_star(ast_manager & m, params_ref const & p):
rewriter_tpl<ite_hoister_cfg>(m, false, m_cfg),
m_cfg(m, p) {}
};
void hoist_non_bool_if(expr_ref& fml) {
ast_manager& m = fml.get_manager();
scoped_no_proof _sp(m);
params_ref p;
ite_hoister_star ite_rw(m, p);
expr_ref tmp(m);
ite_rw(fml, tmp);
fml = tmp;
}
class test_diff_logic {
ast_manager& m;
arith_util a;
@ -1441,7 +1379,6 @@ namespace pdr {
}
template class rewriter_tpl<pdr::ite_hoister_cfg>;
template class rewriter_tpl<pdr::arith_normalizer_cfg>;