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fix #3023 again

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-02-19 10:04:44 -08:00
parent ff436ecb10
commit a543099a4f
1 changed files with 15 additions and 17 deletions
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32
src/tactic/arith/fix_dl_var_tactic.cpp
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@ -27,6 +27,7 @@ Revision History:
#include "ast/arith_decl_plugin.h"
#include "ast/expr_substitution.h"
#include "ast/ast_smt2_pp.h"
#include "ast/ast_pp.h"
class fix_dl_var_tactic : public tactic {
@ -53,10 +54,6 @@ class fix_dl_var_tactic : public tactic {
sort * s = m.get_sort(n);
return s->get_family_id() == m_util.get_family_id();
}
// Return true if n is uninterpreted with respect to arithmetic.
bool is_uninterp(expr * n) {
return is_app(n) && to_app(n)->get_family_id() != m_util.get_family_id();
}
// Remark: we say an expression is nested, if it occurs inside the boolean structure of the formula.
// That is, the expression is not part of an unit clause comprising of a single inequality/equality.
@ -82,9 +79,11 @@ class fix_dl_var_tactic : public tactic {
}
void process_app(app * t) {
unsigned num = t->get_num_args();
for (unsigned i = 0; i < num; i++)
visit(t->get_arg(i), false);
if (!is_uninterp(t) && !is_arith(t)) {
throw_failed(t);
}
for (expr* arg : *t)
visit(arg, false);
}
void process_arith_atom(expr * lhs, expr * rhs, bool nested) {
@ -124,9 +123,10 @@ class fix_dl_var_tactic : public tactic {
void process_eq(app * t, bool nested) {
if (!is_arith(t->get_arg(0))) {
process_app(t);
return;
}
process_arith_atom(t->get_arg(0), t->get_arg(1), nested);
else {
process_arith_atom(t->get_arg(0), t->get_arg(1), nested);
}
}
void process_arith(app * t, bool nested) {
@ -180,12 +180,10 @@ class fix_dl_var_tactic : public tactic {
app * most_occs(obj_map<app, unsigned> & occs, unsigned & best) {
app * r = nullptr;
best = 0;
obj_map<app, unsigned>::iterator it = occs.begin();
obj_map<app, unsigned>::iterator end = occs.end();
for (; it != end; ++it) {
if (it->m_value > best) {
best = it->m_value;
r = it->m_key;
for (auto const& kv : occs) {
if (kv.m_value > best) {
best = kv.m_value;
r = kv.m_key;
}
}
return r;
@ -201,7 +199,7 @@ class fix_dl_var_tactic : public tactic {
app * r1, * r2;
r1 = most_occs(m_non_nested_occs, best1);
r2 = most_occs(m_occs, best2);
TRACE("fix_dl_var_choice",
TRACE("fix_dl_var",
if (r1) {
tout << "r1 occs: " << best1 << "\n";
tout << mk_ismt2_pp(r1, m) << "\n";
@ -254,11 +252,11 @@ class fix_dl_var_tactic : public tactic {
tactic_report report("fix-dl-var", *g);
bool produce_proofs = g->proofs_enabled();
m_produce_models = g->models_enabled();
TRACE("fix_dl_var", g->display(tout););
app * var = is_target(u)(*g);
if (var != nullptr) {
IF_VERBOSE(TACTIC_VERBOSITY_LVL, verbose_stream() << "(fixing-at-zero " << var->get_decl()->get_name() << ")\n";);
tactic_report report("fix-dl-var", *g);
expr_substitution subst(m);
app * zero = u.mk_numeral(rational(0), u.is_int(var));