mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-10-04 23:13:57 +00:00
Code Activity

tune axioms for derivatives

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-25 12:41:30 -07:00
parent 97b480ded3
commit 4e01d5b5c1
8 changed files with 207 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/ast/rewriter/seq_rewriter.cpp
View file

@ -2079,7 +2079,7 @@ expr_ref seq_rewriter::kleene_predicate(expr* cond, sort* seq_sort) {
expr_ref seq_rewriter::is_nullable(expr* r) {
SASSERT(m_util.is_re(r));
expr* r1 = nullptr, *r2 = nullptr;
expr* r1 = nullptr, *r2 = nullptr, *cond = nullptr;
unsigned lo = 0, hi = 0;
expr_ref result(m());
if (re().is_concat(r, r1, r2) ||
@ -2120,6 +2120,9 @@ expr_ref seq_rewriter::is_nullable(expr* r) {
expr* emptystr = m_util.str.mk_empty(seq_sort);
result = m().mk_eq(emptystr, r1);
}
else if (m().is_ite(r, cond, r1, r2)) {
result = m().mk_ite(cond, is_nullable(r1), is_nullable(r2));
}
else {
sort* seq_sort = nullptr;
VERIFY(m_util.is_re(r, seq_sort));
@ -2663,8 +2666,15 @@ br_status seq_rewriter::mk_re_opt(expr* a, expr_ref& result) {
}
bool seq_rewriter::has_cofactor(expr* r, expr_ref& cond, expr_ref& th, expr_ref& el) {
if (m().is_ite(r)) {
cond = to_app(r)->get_arg(0);
th = to_app(r)->get_arg(1);
el = to_app(r)->get_arg(2);
return true;
}
expr_ref_vector trail(m()), args_th(m()), args_el(m());
expr* c = nullptr, *tt = nullptr, *ee = nullptr;
cond = nullptr;
obj_map<expr,expr*> cache_th, cache_el;
expr_mark no_cofactor, visited;
ptr_vector<expr> todo;