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fix some basic mistakes in dominator code

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-08-28 20:11:46 -07:00
parent 597f77cd77
commit 8d8e4cbc51
1 changed files with 13 additions and 10 deletions
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23
src/tactic/core/dom_simplify_tactic.cpp
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@ -69,7 +69,7 @@ private:
m_post2expr.push_back(e);
todo.pop_back();
for (expr* arg : *a) {
add_edge(m_parents, a, arg);
add_edge(m_parents, arg, a);
}
}
}
@ -83,12 +83,17 @@ private:
unsigned n1 = m_expr2post[x];
unsigned n2 = m_expr2post[y];
while (n1 != n2) {
if (n1 < n2)
n1 = m_doms[n1];
else if (n1 > n2)
n2 = m_doms[n2];
if (n1 < n2) {
x = m_doms[x];
n1 = m_expr2post[x];
}
else if (n1 > n2) {
y = m_doms[y];
n2 = m_expr2post[y];
}
}
return n1;
SASSERT(x == y);
return x;
}
void compute_dominators() {
@ -111,6 +116,7 @@ private:
}
if (!m_doms.find(child, idom2) || idom2 != new_idom) {
m_doms.insert(child, new_idom);
change = true;
}
}
}
@ -118,10 +124,7 @@ private:
void extract_tree() {
for (auto const& kv : m_doms) {
expr * child = kv.m_key;
for (expr * parent : kv.m_value) {
add_edge(m_tree, parent, child);
}
add_edge(m_tree, kv.m_value, kv.m_key);
}
}