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fixed redundant check

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This commit is contained in:
Thai Trinh 2017-12-08 17:20:30 +08:00
parent 7ece37f9a1
commit 6253faece7
1 changed files with 5 additions and 3 deletions
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8
src/smt/theory_seq.cpp
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@ -522,7 +522,7 @@ bool theory_seq::eq_unit(expr* const& l, expr* const &r) const {
return l == r || is_unit_nth(l) || is_unit_nth(r);
}
// exists x, y, rs' s.t. (ls = x ++ rs' ++ y & rs = rs') || (ls = rs' ++ x && rs = y ++ rs')
// exists x, y, rs' != empty s.t. (ls = x ++ rs' ++ y & rs = rs') || (ls = rs' ++ x && rs = y ++ rs')
unsigned_vector theory_seq::overlap(ptr_vector<expr> const& ls, ptr_vector<expr> const& rs) {
SASSERT(!ls.empty() && !rs.empty());
unsigned_vector res;
@ -554,7 +554,7 @@ unsigned_vector theory_seq::overlap(ptr_vector<expr> const& ls, ptr_vector<expr>
return result;
}
// exists x, y, rs' s.t. (ls = x ++ rs' ++ y & rs = rs') || (ls = x ++ rs' && rs = rs' ++ y)
// exists x, y, rs' != empty s.t. (ls = x ++ rs' ++ y & rs = rs') || (ls = x ++ rs' && rs = rs' ++ y)
unsigned_vector theory_seq::overlap2(ptr_vector<expr> const& ls, ptr_vector<expr> const& rs) {
SASSERT(!ls.empty() && !rs.empty());
unsigned_vector res;
@ -568,11 +568,13 @@ unsigned_vector theory_seq::overlap2(ptr_vector<expr> const& ls, ptr_vector<expr
for (unsigned i = 0; i < ls.size(); ++i) {
if (eq_unit(ls[i],rs[0])) {
bool same = true;
for (unsigned j = i; j<ls.size() && j-i<rs.size(); ++j) {
unsigned j = i+1;
while (j<ls.size() && j-i<rs.size()) {
if (!eq_unit(ls[j], rs[j-i])) {
same = false;
break;
}
++j;
}
if (same)
result.push_back(i);