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resurrect rewriting of equality over ite

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2024-11-22 16:56:08 -08:00
parent 0bf9369414
commit 65bfcec146
2 changed files with 15 additions and 1 deletions
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14
src/ast/rewriter/arith_rewriter.cpp
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@ -740,6 +740,20 @@ br_status arith_rewriter::mk_le_ge_eq_core(expr * arg1, expr * arg2, op_kind kin
case EQ: result = m.mk_ite(c, m.mk_eq(t, arg2), m.mk_eq(e, arg2)); return BR_REWRITE2;
}
}
if (m.is_ite(arg2, c, t, e) && is_numeral(t, a2) && is_numeral(arg1, a1)) {
switch (kind) {
case LE: result = a1 <= a2 ? m.mk_or(c, m_util.mk_le(arg1, e)) : m.mk_and(m.mk_not(c), m_util.mk_le(arg1, e)); return BR_REWRITE2;
case GE: result = a1 >= a2 ? m.mk_or(c, m_util.mk_ge(arg1, e)) : m.mk_and(m.mk_not(c), m_util.mk_ge(arg1, e)); return BR_REWRITE2;
case EQ: result = a1 == a2 ? m.mk_or(c, m.mk_eq(e, arg1)) : m.mk_and(m.mk_not(c), m_util.mk_eq(e, arg1)); return BR_REWRITE2;
}
}
if (m.is_ite(arg2, c, t, e) && is_numeral(e, a2) && is_numeral(arg1, a1)) {
switch (kind) {
case LE: result = a1 <= a2 ? m.mk_or(m.mk_not(c), m_util.mk_le(arg1, t)) : m.mk_and(c, m_util.mk_le(arg1, t)); return BR_REWRITE2;
case GE: result = a1 >= a2 ? m.mk_or(m.mk_not(c), m_util.mk_ge(arg1, e)) : m.mk_and(c, m_util.mk_ge(arg1, t)); return BR_REWRITE2;
case EQ: result = a1 == a2 ? m.mk_or(m.mk_not(c), m.mk_eq(t, arg1)) : m.mk_and(c, m_util.mk_eq(t, arg1)); return BR_REWRITE2;
}
}
if (m_util.is_to_int(arg2) && is_numeral(arg1)) {
kind = inv(kind);
std::swap(arg1, arg2);

2
src/ast/rewriter/th_rewriter.cpp
View file

@ -320,7 +320,7 @@ struct th_rewriter_cfg : public default_rewriter_cfg {
return pull_ite_core<true>(f, to_app(args[1]), to_app(args[0]), result);
}
family_id fid = f->get_family_id();
if (num == 2 && (fid == m().get_basic_family_id() || fid == m_bv_rw.get_fid())) {
if (num == 2 && (fid == m().get_basic_family_id())) {
// (f v3 (ite c v1 v2)) --> (ite v (f v3 v1) (f v3 v2))
if (m().is_value(args[0]) && is_ite_value_tree(args[1]))
return pull_ite_core<true>(f, to_app(args[1]), to_app(args[0]), result);