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#5482

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This commit is contained in:
Nikolaj Bjorner 2021-08-25 05:24:57 -07:00
parent 7bae297297
commit 037c93b258
1 changed files with 16 additions and 8 deletions
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24
src/sat/smt/bv_internalize.cpp
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@ -530,15 +530,23 @@ namespace bv {
expr* arg1 = n->get_arg(0);
expr* arg2 = n->get_arg(1);
mk_bits(get_th_var(n));
sat::literal eq_lit;
if (p.hi_div0()) {
add_unit(eq_internalize(n, ibin(arg1, arg2)));
return;
}
unsigned sz = bv.get_bv_size(n);
expr_ref zero(bv.mk_numeral(0, sz), m);
expr_ref eq(m.mk_eq(arg2, zero), m);
expr_ref ite(m.mk_ite(eq, iun(arg1), ibin(arg1, arg2)), m);
add_unit(eq_internalize(n, ite));
eq_lit = eq_internalize(n, ibin(arg1, arg2));
add_unit(eq_lit);
ctx.add_root(eq_lit);
}
else {
unsigned sz = bv.get_bv_size(n);
expr_ref zero(bv.mk_numeral(0, sz), m);
sat::literal eqZ = eq_internalize(arg2, zero);
sat::literal eqU = mk_literal(iun(arg1));
sat::literal eqI = mk_literal(ibin(arg1, arg2));
add_clause(~eqZ, eqU);
add_clause(eqZ, eqI);
ctx.add_aux(~eqZ, eqU);
ctx.add_aux(eqZ, eqI);
}
}
void solver::internalize_unary(app* n, std::function<void(unsigned, expr* const*, expr_ref_vector&)>& fn) {