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add missing tactic descriptions, add rewrite for tamagochi

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-01-08 13:32:26 -08:00
parent 95cb06d8cf
commit fcea32344e
19 changed files with 147 additions and 49 deletions
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34
src/ast/rewriter/th_rewriter.cpp
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@ -125,36 +125,6 @@ struct th_rewriter_cfg : public default_rewriter_cfg {
return num_steps > m_max_steps;
}
// Return true if t is of the form
// (= t #b0)
// (= t #b1)
// (= #b0 t)
// (= #b1 t)
bool is_eq_bit(expr * t, expr * & x, unsigned & val) {
if (!m().is_eq(t))
return false;
expr * lhs = to_app(t)->get_arg(0);
if (!m_bv_rw.is_bv(lhs))
return false;
if (m_bv_rw.get_bv_size(lhs) != 1)
return false;
expr * rhs = to_app(t)->get_arg(1);
rational v;
unsigned sz;
if (m_bv_rw.is_numeral(lhs, v, sz)) {
x = rhs;
val = v.get_unsigned();
SASSERT(val == 0 || val == 1);
return true;
}
if (m_bv_rw.is_numeral(rhs, v, sz)) {
x = lhs;
val = v.get_unsigned();
SASSERT(val == 0 || val == 1);
return true;
}
return false;
}
// (iff (= x bit1) A)
// --->
@ -162,11 +132,11 @@ struct th_rewriter_cfg : public default_rewriter_cfg {
br_status apply_tamagotchi(expr * lhs, expr * rhs, expr_ref & result) {
expr * x;
unsigned val;
if (is_eq_bit(lhs, x, val)) {
if (m_bv_rw.is_eq_bit(lhs, x, val)) {
result = m().mk_eq(x, m().mk_ite(rhs, m_bv_rw.mk_numeral(val, 1), m_bv_rw.mk_numeral(1-val, 1)));
return BR_REWRITE2;
}
if (is_eq_bit(rhs, x, val)) {
if (m_bv_rw.is_eq_bit(rhs, x, val)) {
result = m().mk_eq(x, m().mk_ite(lhs, m_bv_rw.mk_numeral(val, 1), m_bv_rw.mk_numeral(1-val, 1)));
return BR_REWRITE2;
}