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perf(kernel/expr_eq): delay hashtable initialization

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-10-25 09:21:47 -07:00
parent e0ca27bfb3
commit f38178311c
1 changed files with 8 additions and 5 deletions
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11
src/kernel/expr_eq.h
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@ -5,6 +5,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include <memory>
#include "kernel/expr.h"
#include "kernel/expr_sets.h"
@ -24,7 +25,7 @@ struct id_expr_fn {
*/
template<typename N = id_expr_fn, bool UseHash = true>
class expr_eq_fn {
expr_cell_pair_set m_eq_visited;
std::unique_ptr<expr_cell_pair_set> m_eq_visited;
N m_norm;
bool apply(expr const & a0, expr const & b0) {
@ -37,9 +38,11 @@ class expr_eq_fn {
if (is_var(a)) return var_idx(a) == var_idx(b);
if (is_shared(a) && is_shared(b)) {
auto p = std::make_pair(a.raw(), b.raw());
if (m_eq_visited.find(p) != m_eq_visited.end())
if (!m_eq_visited)
m_eq_visited.reset(new expr_cell_pair_set);
if (m_eq_visited->find(p) != m_eq_visited->end())
return true;
m_eq_visited.insert(p);
m_eq_visited->insert(p);
}
switch (a.kind()) {
case expr_kind::Var: lean_unreachable();
@ -81,6 +84,6 @@ public:
bool operator()(expr const & a, expr const & b) {
return apply(a, b);
}
void clear() { m_eq_visited.clear(); }
void clear() { m_eq_visited.reset(); }
};
}