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small simplification

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-03-17 16:30:53 -07:00
parent 3719b449e8
commit 2847dd8bb3
1 changed files with 14 additions and 35 deletions
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49
src/smt/seq/seq_nielsen.cpp
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@ -2459,42 +2459,21 @@ namespace seq {
continue;
// char vs var: branch 1: var -> ε, branch 2: var -> char·var
if (lhead->is_char() && rhead->is_var()) {
{
nielsen_node* child = mk_child(node);
nielsen_edge* e = mk_edge(node, child, true);
nielsen_subst s(rhead, m_sg.mk_empty_seq(rhead->get_sort()), eq.m_dep);
e->add_subst(s);
child->apply_subst(m_sg, s);
}
{
euf::snode* replacement = dir_concat(m_sg, lhead, rhead, fwd);
nielsen_node* child = mk_child(node);
nielsen_edge* e = mk_edge(node, child, false);
nielsen_subst s(rhead, replacement, eq.m_dep);
e->add_subst(s);
child->apply_subst(m_sg, s);
}
return true;
}
euf::snode* char_head = lhead->is_unit() ? lhead : (rhead->is_unit() ? rhead : nullptr);
euf::snode* var_head = lhead->is_var() ? lhead : (rhead->is_var() ? rhead : nullptr);
if (char_head && var_head) {
nielsen_node* child = mk_child(node);
nielsen_edge* e = mk_edge(node, child, true);
nielsen_subst s1(var_head, m_sg.mk_empty_seq(var_head->get_sort()), eq.m_dep);
e->add_subst(s1);
child->apply_subst(m_sg, s1);
// var vs char: branch 1: var -> ε, branch 2: var -> char·var
if (rhead->is_char() && lhead->is_var()) {
{
nielsen_node* child = mk_child(node);
nielsen_edge* e = mk_edge(node, child, true);
nielsen_subst s(lhead, m_sg.mk_empty_seq(lhead->get_sort()), eq.m_dep);
e->add_subst(s);
child->apply_subst(m_sg, s);
}
{
euf::snode* replacement = dir_concat(m_sg, rhead, lhead, fwd);
nielsen_node* child = mk_child(node);
nielsen_edge* e = mk_edge(node, child, false);
nielsen_subst s(lhead, replacement, eq.m_dep);
e->add_subst(s);
child->apply_subst(m_sg, s);
}
euf::snode* replacement = dir_concat(m_sg, char_head, var_head, fwd);
child = mk_child(node);
e = mk_edge(node, child, false);
nielsen_subst s2(var_head, replacement, eq.m_dep);
e->add_subst(s2);
child->apply_subst(m_sg, s2);
return true;
}
}