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separate fixed from bits to allow updates that break tabu

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- range and fixed restrictions on terms are based on constraints and can be violated temporarily.
- bv_eval currently does not allow updating over fixed bits which leads to non-termination. TODO
- lookahead only considers tabu when setting values of variables.
This commit is contained in:
Nikolaj Bjorner 2024-12-30 17:47:18 -08:00
parent 983763213b
commit 3433b14dfa
10 changed files with 224 additions and 193 deletions
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11
src/ast/sls/sls_array_plugin.cpp
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@ -82,11 +82,16 @@ namespace sls {
for (auto p : euf::enode_parents(n->get_root()))
if (a.is_select(p->get_expr()))
add_map_axiom(g, n, p);
for (auto arg : euf::enode_args(n)) {
SASSERT(a.is_array(arg->get_expr()));
for (auto p : euf::enode_parents(arg->get_root()))
if (a.is_select(p->get_expr()))
add_map_axiom(g, n, p);
}
}
void array_plugin::add_map_axiom(euf::egraph& g, euf::enode * n, euf::enode* sel) {
func_decl* f = nullptr;
VERIFY(sel->get_arg(0)->get_root() == n->get_root());
SASSERT(a.is_map(n->get_expr()));
VERIFY(a.is_map(n->get_decl(), f));
expr_ref apply_map(m);
@ -101,7 +106,9 @@ namespace sls {
auto nsel = mk_select(g, n, sel);
auto nmap = g.find(f_map);
if (!nmap)
nmap = g.mk(f_map, 0, eargs.size(), eargs.data());
nmap = g.mk(f_map, 0, eargs.size(), eargs.data());
if (nmap->get_root() == nsel->get_root())
return;
if (are_distinct(nsel, nmap)) {
expr_ref eq(m.mk_eq(nmap->get_expr(), nsel->get_expr()), m);
ctx.add_clause(eq);