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FPA theory bug fixes.

Browse source 
Also removed unnecessary intermediate variables.

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>
This commit is contained in:
Christoph M. Wintersteiger 2014-08-04 17:00:04 +01:00
parent 2cd4edf1a2
commit 8b40d4a735
4 changed files with 85 additions and 60 deletions
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67
examples/c/test_capi.c
View file

@ -2599,11 +2599,11 @@ void fpa_example() {
Z3_config cfg;
Z3_context ctx;
Z3_sort double_sort, rm_sort;
Z3_symbol symbol_rm, symbol_x, symbol_y;
Z3_ast rm, x, y, n, c;
Z3_symbol symbol_rm, symbol_x, symbol_y, symbol_q;
Z3_ast rm, x, y, n, q, c1, c2, c3, c4, c5, c6;
printf("\nFPA-example\n");
LOG_MSG("FPA-example");
printf("\nfpa_example\n");
LOG_MSG("fpa_example");
cfg = Z3_mk_config();
ctx = Z3_mk_context(cfg);
@ -2620,16 +2620,32 @@ void fpa_example() {
y = Z3_mk_const(ctx, symbol_y, double_sort);
n = Z3_mk_fpa_double(ctx, 42.0, double_sort);
Z3_symbol q_s = Z3_mk_string_symbol(ctx, "q");
Z3_ast q = Z3_mk_const(ctx, q_s, double_sort);
c = Z3_mk_eq(ctx, q, Z3_mk_fpa_add(ctx, rm, x, y));
symbol_q = Z3_mk_string_symbol(ctx, "q");
q = Z3_mk_const(ctx, symbol_q, double_sort);
c1 = Z3_mk_eq(ctx, q, Z3_mk_fpa_add(ctx, rm, x, y));
Z3_ast args[2] = { c, Z3_mk_eq(ctx, q, n) };
c = Z3_mk_and(ctx, 2, (Z3_ast*)&args);
Z3_ast args[2] = { c1, Z3_mk_eq(ctx, q, n) };
c2 = Z3_mk_and(ctx, 2, (Z3_ast*)&args);
printf("c = %s\n", Z3_ast_to_string(ctx, c));
Z3_ast args2[2] = { c2, Z3_mk_not(ctx, Z3_mk_eq(ctx, rm, Z3_mk_fpa_round_nearest_ties_to_away(ctx))) };
c3 = Z3_mk_and(ctx, 2, (Z3_ast*)&args2);
Z3_assert_cnstr(ctx, c);
Z3_ast and_args[3] = {
Z3_mk_not(ctx, Z3_mk_fpa_is_zero(ctx, y)),
Z3_mk_not(ctx, Z3_mk_fpa_is_nan(ctx, y)),
Z3_mk_not(ctx, Z3_mk_fpa_is_inf(ctx, y)) };
Z3_ast args3[2] = { c3, Z3_mk_and(ctx, 3, and_args) };
c4 = Z3_mk_and(ctx, 2, (Z3_ast*)&args3);
Z3_assert_cnstr(ctx, c4);
Z3_push(ctx);
// c5 := (IEEEBV(x) == 7.0).
c5 = Z3_mk_eq(ctx, Z3_mk_fpa_to_ieee_bv(ctx, x),
Z3_mk_numeral(ctx, "4619567317775286272", Z3_mk_bv_sort(ctx, 64)));
Z3_assert_cnstr(ctx, c5);
Z3_model m = 0;
Z3_lbool result = Z3_check_and_get_model(ctx, &m);
@ -2639,19 +2655,44 @@ void fpa_example() {
break;
case Z3_L_UNDEF:
printf("unknown\n");
printf("potential model:\n%s\n", Z3_model_to_string(ctx, m));
break;
case Z3_L_TRUE:
printf("sat\n%s\n", Z3_model_to_string(ctx, m));
Z3_del_model(ctx, m);
break;
}
if (m)
Z3_pop(ctx, 1);
// c6 := (IEEEBV(x) == 28.0).
c6 = Z3_mk_eq(ctx, Z3_mk_fpa_to_ieee_bv(ctx, x),
Z3_mk_numeral(ctx, "4628574517030027264", Z3_mk_bv_sort(ctx, 64)));
Z3_assert_cnstr(ctx, c6);
Z3_push(ctx);
m = 0;
result = Z3_check_and_get_model(ctx, &m);
switch (result) {
case Z3_L_FALSE:
printf("unsat\n");
break;
case Z3_L_UNDEF:
printf("unknown\n");
printf("potential model:\n%s\n", Z3_model_to_string(ctx, m));
break;
case Z3_L_TRUE:
printf("sat\n%s\n", Z3_model_to_string(ctx, m));
Z3_del_model(ctx, m);
break;
}
Z3_pop(ctx, 1);
Z3_del_context(ctx);
}
/*@}*/
/*@}*/

2
src/api/api_numeral.cpp
View file

@ -193,7 +193,7 @@ extern "C" {
// floats are separated from all others to avoid huge rationals.
float_util & fu = mk_c(c)->float_util();
scoped_mpf tmp(fu.fm());
if (mk_c(c)->float_util().is_numeral(to_expr(a), tmp)) {
if (mk_c(c)->float_util().is_value(to_expr(a), tmp)) {
return mk_c(c)->mk_external_string(fu.fm().to_string(tmp));
}
else {

62
src/smt/theory_fpa.cpp
View file

@ -60,15 +60,6 @@ namespace smt {
ctx.mark_as_relevant(l);
}
app_ref theory_fpa::mk_eq_bv_const(expr_ref const & e) {
ast_manager & m = get_manager();
context & ctx = get_context();
app_ref bv_const(m);
bv_const = m.mk_fresh_const(0, m.get_sort(e));
mk_bv_eq(bv_const, e);
return bv_const;
}
bool theory_fpa::internalize_atom(app * atom, bool gate_ctx) {
TRACE("t_fpa", tout << "internalizing atom: " << mk_ismt2_pp(atom, get_manager()) << "\n";);
SASSERT(atom->get_family_id() == get_family_id());
@ -128,7 +119,7 @@ namespace smt {
proof_ref bv_pr(m);
simp(t, bv_rm, bv_pr);
bv_term = mk_eq_bv_const(bv_rm);
bv_term = bv_rm;
}
else if (m_converter.is_float(term_sort)) {
SASSERT(is_app(t) && to_app(t)->get_num_args() == 3);
@ -139,19 +130,13 @@ namespace smt {
simp(a->get_arg(1), sig, pr_sig);
simp(a->get_arg(2), exp, pr_exp);
app_ref bv_v_sgn = mk_eq_bv_const(sgn);
app_ref bv_v_sig = mk_eq_bv_const(sig);
app_ref bv_v_exp = mk_eq_bv_const(exp);
m_converter.mk_triple(bv_v_sgn, bv_v_sig, bv_v_exp, bv_term);
m_converter.mk_triple(sgn, sig, exp, bv_term);
}
else if (term->get_decl_kind() == OP_TO_IEEE_BV) {
SASSERT(is_app(t));
expr_ref bv_e(m);
proof_ref bv_pr(m);
simp(t, bv_e, bv_pr);
bv_term = mk_eq_bv_const(bv_e);
simp(t, bv_term, bv_pr);
}
else
NOT_IMPLEMENTED_YET();
@ -164,6 +149,7 @@ namespace smt {
enode * e = (ctx.e_internalized(term)) ? ctx.get_enode(term) : ctx.mk_enode(term, false, false, true);
theory_var v = mk_var(e);
ctx.attach_th_var(e, this, v);
m_tvars.push_back(v);
TRACE("t_fpa", tout << "new theory var: " << mk_ismt2_pp(term, get_manager()) << " := " << v << "\n";);
SASSERT(e->get_th_var(get_id()) != null_theory_var);
return v != null_theory_var;
@ -180,23 +166,14 @@ namespace smt {
theory_var v = mk_var(n);
ctx.attach_th_var(n, this, v);
m_tvars.push_back(v);
m_rw(owner, converted);
m_trans_map.insert(owner, converted, 0);
if (m_converter.is_rm(m.get_sort(owner))) {
mk_eq_bv_const(converted);
}
else {
app * a = to_app(converted);
expr_ref sgn(m), sig(m), exp(m);
proof_ref pr_sgn(m), pr_sig(m), pr_exp(m);
simp(a->get_arg(0), sgn, pr_sgn);
simp(a->get_arg(1), sig, pr_sig);
simp(a->get_arg(2), exp, pr_exp);
mk_eq_bv_const(sgn);
mk_eq_bv_const(sig);
mk_eq_bv_const(exp);
sort * owner_sort = m.get_sort(owner);
if (m_converter.is_rm(owner_sort)) {
bv_util & bu = m_converter.bu();
bu.mk_ule(converted, bu.mk_numeral(4, bu.get_bv_size(converted)));
}
TRACE("t_fpa", tout << "new theory var (const): " << mk_ismt2_pp(owner, get_manager()) << " := " << v << "\n";);
@ -215,7 +192,7 @@ namespace smt {
m_trans_map.get(ax, ex, px);
m_trans_map.get(ay, ey, py);
if (m_converter.fu().is_float(m.get_sort(get_enode(x)->get_owner()))) {
if (m_converter.fu().is_float(get_enode(x)->get_owner())) {
expr * sgn_x, *sig_x, *exp_x;
expr * sgn_y, *sig_y, *exp_y;
split_triple(ex, sgn_x, sig_x, exp_x);
@ -225,7 +202,7 @@ namespace smt {
mk_bv_eq(sig_x, sig_y);
mk_bv_eq(exp_x, exp_y);
}
else if (m_converter.fu().is_rm(m.get_sort(get_enode(x)->get_owner()))) {
else if (m_converter.fu().is_rm(get_enode(x)->get_owner())) {
mk_bv_eq(ex, ey);
}
else
@ -273,7 +250,13 @@ namespace smt {
}
void theory_fpa::pop_scope_eh(unsigned num_scopes) {
TRACE("bv", tout << num_scopes << "\n";);
m_trail_stack.pop_scope(num_scopes);
unsigned num_old_vars = get_old_num_vars(num_scopes);
for (unsigned i = num_old_vars; i < get_num_vars(); i++) {
m_trans_map.erase(get_enode(m_tvars[i])->get_owner());
}
m_tvars.shrink(num_old_vars);
theory::pop_scope_eh(num_scopes);
}
@ -405,6 +388,7 @@ namespace smt {
void theory_fpa::assign_eh(bool_var v, bool is_true) {
TRACE("t_fpa", tout << "assign_eh for: " << v << " (" << is_true << ")\n";);
/* CMW: okay to ignore? */
theory::assign_eh(v, is_true);
}
void theory_fpa::relevant_eh(app * n) {
@ -441,14 +425,10 @@ namespace smt {
ctx.mark_as_relevant(bv_exp);
}
else if (n->get_decl()->get_decl_kind() == OP_TO_IEEE_BV) {
//literal l = mk_eq(n, ex, false);
//ctx.mark_as_relevant(l);
//ctx.mk_th_axiom(get_id(), 1, &l);
expr_ref eq(m);
app * ex_a = to_app(ex);
if (n->get_id() > ex_a->get_id())
std::swap(n, ex_a);
expr_ref eq(m);
eq = m.mk_eq(n, ex_a);
ctx.internalize(eq, false);
literal l = ctx.get_literal(eq);
@ -464,7 +444,11 @@ namespace smt {
void theory_fpa::reset_eh() {
pop_scope_eh(m_trail_stack.get_num_scopes());
m_rw.reset();
m_trans_map.reset();
m_bool_var2atom.reset();
m_temporaries.reset();
m_tvars.reset();
theory::reset_eh();
}

2
src/smt/theory_fpa.h
View file

@ -55,6 +55,7 @@ namespace smt {
th_trail_stack m_trail_stack;
bool_var2atom m_bool_var2atom;
enode_vector m_temporaries;
int_vector m_tvars;
virtual final_check_status final_check_eh() { return FC_DONE; }
virtual bool internalize_atom(app * atom, bool gate_ctx);
@ -88,7 +89,6 @@ namespace smt {
}
void mk_bv_eq(expr * x, expr * y);
app_ref mk_eq_bv_const(expr_ref const & e);
};
};