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fix #6600

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ensure that semantics of last-indexof(t,"") = len(t)
This commit is contained in:
Nikolaj Bjorner 2023-02-19 14:02:37 -08:00
parent 0758c93086
commit 755b517001
2 changed files with 3 additions and 4 deletions
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4
src/ast/rewriter/seq_axioms.cpp
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@ -513,8 +513,8 @@ namespace seq {
!contains(t, s) => i = -1
|t| = 0 => |s| = 0 or i = -1
|t| = 0 & |s| = 0 => i = 0
|t| != 0 & contains(t, s) => t = xsy & i = len(x)
|s| = 0 => i = len(t)
|s| = 0 or s = s_head*s_tail
|s| = 0 or !contains(s_tail*y, s)
@ -540,7 +540,7 @@ namespace seq {
add_clause(cnt, i_eq_m1);
add_clause(~t_eq_empty, s_eq_empty, i_eq_m1);
add_clause(~t_eq_empty, ~s_eq_empty, i_eq_0);
add_clause(~s_eq_empty, mk_eq(i, mk_len(t)));
add_clause(t_eq_empty, ~cnt, mk_seq_eq(t, xsy));
add_clause(t_eq_empty, ~cnt, mk_eq(i, mk_len(x)));
add_clause(s_eq_empty, mk_eq(s, mk_concat(s_head, s_tail)));

3
src/util/zstring.cpp
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@ -214,8 +214,7 @@ int zstring::indexofu(zstring const& other, unsigned offset) const {
}
int zstring::last_indexof(zstring const& other) const {
if (length() == 0 && other.length() == 0) return 0;
if (other.length() == 0) return -1;
if (other.length() == 0) return length();
if (other.length() > length()) return -1;
for (unsigned last = length() - other.length() + 1; last-- > 0; ) {
bool suffix = true;