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Fix #430: disable rewriting of concatentations with constants because it breaks equality propagation

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-02-05 10:59:24 +00:00
parent 2a65503235
commit cf970fd76a
2 changed files with 9 additions and 5 deletions
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4
src/ast/rewriter/bv_rewriter.cpp
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@ -2010,8 +2010,8 @@ bool bv_rewriter::is_add_mul_const(expr* e) const {
bool bv_rewriter::is_concat_target(expr* lhs, expr* rhs) const {
return
(m_util.is_concat(lhs) && (is_concat_split_target(rhs) || has_numeral(to_app(lhs)))) ||
(m_util.is_concat(rhs) && (is_concat_split_target(lhs) || has_numeral(to_app(rhs))));
(m_util.is_concat(lhs) && is_concat_split_target(rhs)) ||
(m_util.is_concat(rhs) && is_concat_split_target(lhs));
}
bool bv_rewriter::has_numeral(app* a) const {

10
src/tactic/core/solve_eqs_tactic.cpp
View file

@ -106,9 +106,13 @@ class solve_eqs_tactic : public tactic {
}
}
bool trivial_solve(expr * lhs, expr * rhs, app_ref & var, expr_ref & def, proof_ref & pr) {
return
trivial_solve1(lhs, rhs, var, def, pr) ||
trivial_solve1(rhs, lhs, var, def, pr);
if (trivial_solve1(lhs, rhs, var, def, pr)) return true;
if (trivial_solve1(rhs, lhs, var, def, pr)) {
if (m_produce_proofs) {
pr = m().mk_commutativity(m().mk_eq(lhs, rhs));
}
}
return false;
}
// (ite c (= x t1) (= x t2)) --> (= x (ite c t1 t2))