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add helper axioms for int2bv #5396

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This commit is contained in:
Nikolaj Bjorner 2021-07-10 17:13:16 +02:00
parent 34885562e0
commit 66fc980154
2 changed files with 24 additions and 11 deletions
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34
src/smt/theory_bv.cpp
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@ -646,9 +646,8 @@ namespace smt {
);
ctx.mark_as_relevant(l);
if (m.has_trace_stream()) log_axiom_instantiation(ctx.bool_var2expr(l.var()));
scoped_trace_stream _ts(*this, l);
ctx.mk_th_axiom(get_id(), 1, &l);
if (m.has_trace_stream()) m.trace_stream() << "[end-of-instance]\n";
}
void theory_bv::internalize_int2bv(app* n) {
@ -688,9 +687,10 @@ namespace smt {
literal l(mk_eq(lhs, rhs, false));
ctx.mark_as_relevant(l);
if (m.has_trace_stream()) log_axiom_instantiation(ctx.bool_var2expr(l.var()));
ctx.mk_th_axiom(get_id(), 1, &l);
if (m.has_trace_stream()) m.trace_stream() << "[end-of-instance]\n";
{
scoped_trace_stream _ts(*this, l);
ctx.mk_th_axiom(get_id(), 1, &l);
}
TRACE("bv",
tout << mk_pp(lhs, m) << " == \n";
@ -704,17 +704,29 @@ namespace smt {
for (unsigned i = 0; i < sz; ++i) {
numeral div = power(numeral(2), i);
mod = numeral(2);
rhs = (i == 0) ? e : m_autil.mk_idiv(e, m_autil.mk_numeral(div, true));
rhs = m_autil.mk_mod(rhs, m_autil.mk_numeral(mod, true));
expr_ref div_rhs((i == 0) ? e : m_autil.mk_idiv(e, m_autil.mk_numeral(div, true)), m);
rhs = m_autil.mk_mod(div_rhs, m_autil.mk_numeral(mod, true));
rhs = ctx.mk_eq_atom(rhs, m_autil.mk_int(1));
lhs = n_bits.get(i);
TRACE("bv", tout << mk_pp(lhs, m) << " == " << mk_pp(rhs, m) << "\n";);
l = literal(mk_eq(lhs, rhs, false));
ctx.mark_as_relevant(l);
if (m.has_trace_stream()) log_axiom_instantiation(ctx.bool_var2expr(l.var()));
ctx.mk_th_axiom(get_id(), 1, &l);
if (m.has_trace_stream()) m.trace_stream() << "[end-of-instance]\n";
{
scoped_trace_stream _st(*this, l);
ctx.mk_th_axiom(get_id(), 1, &l);
}
{
// 0 < e < 2^i => e div 2^i = 0
expr_ref zero(m_autil.mk_int(0), m);
literal a = mk_literal(m_autil.mk_ge(e, m_autil.mk_int(div)));
literal b = mk_literal(m_autil.mk_ge(e, zero));
literal c = mk_eq(div_rhs, zero, false);
ctx.mark_as_relevant(a);
ctx.mark_as_relevant(b);
ctx.mark_as_relevant(c);
// scoped_trace_stream _st(*this, a, ~b);
ctx.mk_th_axiom(get_id(), a, ~b, c);
}
}
}