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perf tuning based on Chris's examples

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-02-01 07:51:05 -08:00
parent 2115111dac
commit 995a2e1a29
3 changed files with 277 additions and 22 deletions
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4
src/ast/rewriter/seq_rewriter.cpp
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@ -1421,6 +1421,7 @@ expr* seq_rewriter::concat_non_empty(unsigned n, expr* const* as) {
bool seq_rewriter::set_empty(unsigned sz, expr* const* es, bool all, expr_ref_vector& lhs, expr_ref_vector& rhs) {
zstring s;
expr* emp = 0;
for (unsigned i = 0; i < sz; ++i) {
if (m_util.str.is_unit(es[i])) {
if (all) return false;
@ -1435,7 +1436,8 @@ bool seq_rewriter::set_empty(unsigned sz, expr* const* es, bool all, expr_ref_ve
}
}
else {
lhs.push_back(m_util.str.mk_empty(m().get_sort(es[i])));
emp = emp?emp:m_util.str.mk_empty(m().get_sort(es[i]));
lhs.push_back(emp);
rhs.push_back(es[i]);
}
}