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fixing the behavior in bv_trailing

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This commit is contained in:
Mikolas Janota 2016-04-04 17:00:35 +01:00
parent fced47386e
commit 248feace34
2 changed files with 34 additions and 12 deletions
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1
src/ast/rewriter/bv_rewriter.cpp
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@ -2094,6 +2094,7 @@ br_status bv_rewriter::mk_eq_core(expr * lhs, expr * rhs, expr_ref & result) {
if (m_trailing) {
st = m_rm_trailing.eq_remove_trailing(lhs, rhs, result);
//m_rm_trailing.reset_cache();
if (st != BR_FAILED) {
TRACE("eq_remove_trailing", tout << mk_ismt2_pp(lhs, m()) << "\n=\n" << mk_ismt2_pp(rhs, m()) << "\n----->\n" << mk_ismt2_pp(result, m()) << "\n";);
return st;

45
src/ast/rewriter/bv_trailing.cpp
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@ -26,18 +26,46 @@ struct bv_trailing::imp {
mk_extract_proc& m_mk_extract;
bv_util& m_util;
ast_manager& m_m;
map m_count_cache;
map m_count_cache[TRAILING_DEPTH + 1];
imp(mk_extract_proc& mk_extract)
: m_mk_extract(mk_extract)
, m_util(mk_extract.bvutil())
, m_m(mk_extract.m())
{ }
virtual ~imp() { }
virtual ~imp() {
reset_cache();
}
ast_manager & m() const { return m_util.get_manager(); }
void reset_cache() { m_count_cache.reset(); }
void cache(unsigned depth, expr * e, unsigned min, unsigned max) {
SASSERT(depth <= TRAILING_DEPTH);
m().inc_ref(e);
m_count_cache[depth].insert(e, std::make_pair(min, max));
TRACE("bv-trailing", tout << "caching@" << depth <<": " << mk_ismt2_pp(e, m()) << '[' << m_util.get_bv_size(e) << "]\n: " << min << '-' << max << "\n";);
}
bool is_cached(unsigned depth, expr * e, unsigned& min, unsigned& max) {
SASSERT(depth <= TRAILING_DEPTH);
const map::obj_map_entry * const oe = m_count_cache[depth].find_core(e);
if (oe == NULL) return false;
min = oe->get_data().m_value.first;
max = oe->get_data().m_value.second;
TRACE("bv-trailing", tout << "cached@" << depth << ": " << mk_ismt2_pp(e, m()) << '[' << m_util.get_bv_size(e) << "]\n: " << min << '-' << max << "\n";);
return true;
}
void reset_cache() {
for (unsigned i = 0; i <= TRAILING_DEPTH; ++i) {
map::iterator it = m_count_cache[i].begin();
map::iterator end = m_count_cache[i].end();
for (; it != end; ++it) m().dec_ref(it->m_key);
m_count_cache[i].reset();
}
}
br_status eq_remove_trailing(expr * e1, expr * e2, expr_ref& result) {
TRACE("bv-trailing", tout << mk_ismt2_pp(e1, m()) << "\n=\n" << mk_ismt2_pp(e2, m()) << "\n";);
@ -223,21 +251,14 @@ struct bv_trailing::imp {
}
void count_trailing(expr * e, unsigned& min, unsigned& max, unsigned depth) {
std::pair<unsigned, unsigned> cached;
if (m_count_cache.find(e, cached)) { // check cache first
min = cached.first;
max = cached.second;
if (is_cached(depth, e, min, max))
return;
}
SASSERT(e && m_util.is_bv(e));
count_trailing_core(e, min, max, depth);
TRACE("bv-trailing", tout << mk_ismt2_pp(e, m()) << "\n:" << min << " - " << max << "\n";);
SASSERT(min <= max);
SASSERT(max <= m_util.get_bv_size(e));
// store into the cache
cached.first = min;
cached.second = max;
m_count_cache.insert(e, cached);
cache(depth, e, min, max); // store result into the cache
}
void count_trailing_concat(app * a, unsigned& min, unsigned& max, unsigned depth) {