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relax condition for distributing extract over ite #2359

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-06-23 16:48:42 -07:00
parent b8734273c8
commit db274ebe01
3 changed files with 7 additions and 4 deletions
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7
src/ast/rewriter/bv_rewriter.cpp
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@ -784,10 +784,13 @@ br_status bv_rewriter::mk_extract(unsigned high, unsigned low, expr * arg, expr_
}
}
// issue #2359 led to relaxing condition for propagating extract over ite.
// It is propagted inwards only in the case that it leads to at most one
// branch of ite to be expanded or if one of the expanded ite branches have a single
// reference count.
expr* c = nullptr, *t = nullptr, *e = nullptr;
if (m().is_ite(arg, c, t, e) &&
(t->get_ref_count() == 1 || !m().is_ite(t)) &&
(e->get_ref_count() == 1 || !m().is_ite(e))) {
(t->get_ref_count() == 1 || e->get_ref_count() == 1 || !m().is_ite(t) || !m().is_ite(e))) {
result = m().mk_ite(c, m_mk_extract(high, low, t), m_mk_extract(high, low, e));
return BR_REWRITE2;
}