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fix #5842

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-02-16 17:38:19 +02:00
parent aa6ec418e3
commit 6202cd5394
3 changed files with 22 additions and 32 deletions
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1
src/smt/params/smt_params_helper.pyg
View file

@ -47,7 +47,6 @@ def_module_params(module_name='smt',
('induction', BOOL, False, 'enable generation of induction lemmas'),
('bv.reflect', BOOL, True, 'create enode for every bit-vector term'),
('bv.enable_int2bv', BOOL, True, 'enable support for int2bv and bv2int operators'),
('bv.eq_axioms', BOOL, True, 'add dynamic equality axioms'),
('bv.watch_diseq', BOOL, False, 'use watch lists instead of eager axioms for bit-vectors'),
('bv.delay', BOOL, True, 'delay internalize expensive bit-vector operations'),
('arith.random_initial_value', BOOL, False, 'use random initial values in the simplex-based procedure for linear arithmetic'),

2
src/smt/params/theory_bv_params.cpp
View file

@ -26,7 +26,6 @@ void theory_bv_params::updt_params(params_ref const & _p) {
m_hi_div0 = rp.hi_div0();
m_bv_reflect = p.bv_reflect();
m_bv_enable_int2bv2int = p.bv_enable_int2bv();
m_bv_eq_axioms = p.bv_eq_axioms();
m_bv_delay = p.bv_delay();
}
@ -38,7 +37,6 @@ void theory_bv_params::display(std::ostream & out) const {
DISPLAY_PARAM(m_bv_reflect);
DISPLAY_PARAM(m_bv_lazy_le);
DISPLAY_PARAM(m_bv_cc);
DISPLAY_PARAM(m_bv_eq_axioms);
DISPLAY_PARAM(m_bv_blast_max_size);
DISPLAY_PARAM(m_bv_enable_int2bv2int);
DISPLAY_PARAM(m_bv_delay);

51
src/smt/theory_bv.cpp
View file

@ -224,8 +224,6 @@ namespace smt {
};
void theory_bv::add_new_diseq_axiom(theory_var v1, theory_var v2, unsigned idx) {
if (!params().m_bv_eq_axioms)
return;
m_prop_diseqs.push_back(bv_diseq(v1, v2, idx));
ctx.push_trail(push_back_vector<svector<bv_diseq>>(m_prop_diseqs));
}
@ -432,8 +430,6 @@ namespace smt {
};
void theory_bv::add_fixed_eq(theory_var v1, theory_var v2) {
if (!params().m_bv_eq_axioms)
return;
if (v1 > v2) {
std::swap(v1, v2);
@ -1152,8 +1148,6 @@ namespace smt {
}
void theory_bv::expand_diseq(theory_var v1, theory_var v2) {
if (!params().m_bv_eq_axioms)
return;
SASSERT(get_bv_size(v1) == get_bv_size(v2));
if (v1 > v2) {
@ -1320,30 +1314,29 @@ namespace smt {
}
else {
ctx.assign(consequent, mk_bit_eq_justification(v1, v2, consequent, antecedent));
if (params().m_bv_eq_axioms) {
literal_vector lits;
lits.push_back(~consequent);
lits.push_back(antecedent);
literal eq = mk_eq(get_expr(v1), get_expr(v2), false);
lits.push_back(~eq);
//
// Issue #3035:
// merge_eh invokes assign_bit, which updates the propagation queue and includes the
// theory axiom for the propagated equality. When relevancy is non-zero, propagation may get
// lost on backtracking because the propagation queue is reset on conflicts.
// An alternative approach is to ensure the propagation queue is chronological with
// backtracking scopes (ie., it doesn't get reset, but shrunk to a previous level, and similar
// with a qhead indicator.
//
ctx.mark_as_relevant(lits[0]);
ctx.mark_as_relevant(lits[1]);
ctx.mark_as_relevant(lits[2]);
{
scoped_trace_stream _sts(*this, lits);
ctx.mk_th_axiom(get_id(), lits.size(), lits.data());
}
literal_vector lits;
lits.push_back(~consequent);
lits.push_back(antecedent);
literal eq = mk_eq(get_expr(v1), get_expr(v2), false);
lits.push_back(~eq);
//
// Issue #3035:
// merge_eh invokes assign_bit, which updates the propagation queue and includes the
// theory axiom for the propagated equality. When relevancy is non-zero, propagation may get
// lost on backtracking because the propagation queue is reset on conflicts.
// An alternative approach is to ensure the propagation queue is chronological with
// backtracking scopes (ie., it doesn't get reset, but shrunk to a previous level, and similar
// with a qhead indicator.
//
ctx.mark_as_relevant(lits[0]);
ctx.mark_as_relevant(lits[1]);
ctx.mark_as_relevant(lits[2]);
{
scoped_trace_stream _sts(*this, lits);
ctx.mk_th_axiom(get_id(), lits.size(), lits.data());
}
if (m_wpos[v2] == idx)
find_wpos(v2);
// REMARK: bit_eq_justification is marked as a theory_bv justification.