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add sin/cos axiom regardless of whether sin/cos can be eliminated. fix #2037

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-12-13 16:09:08 -06:00
parent c5ada288c2
commit 58b9fc437d
1 changed files with 7 additions and 5 deletions
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12
src/tactic/arith/purify_arith_tactic.cpp
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@ -509,6 +509,9 @@ struct purify_arith_proc {
return BR_DONE; return BR_DONE;
} }
else { else {
expr_ref s(u().mk_sin(theta), m());
expr_ref c(u().mk_cos(theta), m());
push_cnstr(EQ(mk_real_one(), u().mk_add(u().mk_mul(s, s), u().mk_mul(c, c))));
return BR_FAILED; return BR_FAILED;
} }
} }
@ -777,11 +780,10 @@ struct purify_arith_proc {
if (produce_models && !m_sin_cos.empty()) { if (produce_models && !m_sin_cos.empty()) {
generic_model_converter* emc = alloc(generic_model_converter, m(), "purify_sin_cos"); generic_model_converter* emc = alloc(generic_model_converter, m(), "purify_sin_cos");
mc = concat(mc.get(), emc); mc = concat(mc.get(), emc);
obj_map<app, std::pair<expr*,expr*> >::iterator it = m_sin_cos.begin(), end = m_sin_cos.end(); for (auto const& kv : m_sin_cos) {
for (; it != end; ++it) { emc->add(kv.m_key->get_decl(),
emc->add(it->m_key->get_decl(), m().mk_ite(u().mk_ge(kv.m_value.first, mk_real_zero()), u().mk_acos(kv.m_value.second),
m().mk_ite(u().mk_ge(it->m_value.first, mk_real_zero()), u().mk_acos(it->m_value.second), u().mk_add(u().mk_acos(u().mk_uminus(kv.m_value.second)), u().mk_pi())));
u().mk_add(u().mk_acos(u().mk_uminus(it->m_value.second)), u().mk_pi())));
} }
} }