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remove unsound simplification in prefix #949

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-03-21 07:40:35 -06:00
parent d58018841e
commit ca4ae171ea
2 changed files with 16 additions and 8 deletions
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7
src/smt/theory_seq.cpp
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@ -2719,7 +2719,9 @@ bool theory_seq::can_propagate() {
expr_ref theory_seq::canonize(expr* e, dependency*& eqs) {
expr_ref result = expand(e, eqs);
TRACE("seq", tout << mk_pp(e, m) << " expands to " << result << "\n";);
m_rewrite(result);
TRACE("seq", tout << mk_pp(e, m) << " rewrites to " << result << "\n";);
return result;
}
@ -4469,10 +4471,11 @@ bool theory_seq::canonizes(bool sign, expr* e) {
context& ctx = get_context();
dependency* deps = 0;
expr_ref cont = canonize(e, deps);
TRACE("seq", tout << mk_pp(e, m) << " -> " << cont << "\n";);
TRACE("seq", tout << mk_pp(e, m) << " -> " << cont << "\n";
if (deps) display_deps(tout, deps););
if ((m.is_true(cont) && !sign) ||
(m.is_false(cont) && sign)) {
TRACE("seq", display(tout););
TRACE("seq", display(tout); tout << ctx.get_assignment(ctx.get_literal(e)) << "\n";);
propagate_lit(deps, 0, 0, ctx.get_literal(e));
return true;
}