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asymm branch

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-11-08 07:21:49 -08:00
parent 2746528aab
commit b099449ce1
1 changed files with 12 additions and 7 deletions
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19
src/sat/sat_asymm_branch.cpp
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@ -110,7 +110,13 @@ namespace sat {
}
m_counter = -m_counter;
s.m_phase = saved_phase;
m_asymm_branch_limit *= 2;
if (m_asymm_branch_limit > INT_MAX)
m_asymm_branch_limit = INT_MAX;
CASSERT("asymm_branch", s.check_invariant());
}
bool asymm_branch::process_all(clause & c) {
@ -121,16 +127,14 @@ namespace sat {
unsigned sz = c.size();
SASSERT(sz > 0);
unsigned i = 0, new_sz = sz;
bool found = false;
for (; i < sz; i++) {
found = flip_literal_at(c, i, new_sz);
if (found) break;
for (i = sz; i-- > 0; ) {
if (flip_literal_at(c, i, new_sz))
return cleanup(scoped_d, c, i, new_sz);
}
return !found || cleanup(scoped_d, c, i, new_sz);
return true;
}
bool asymm_branch::propagate_literal(clause const& c, literal l) {
m_counter -= c.size();
SASSERT(!s.inconsistent());
TRACE("asymm_branch_detail", tout << "assigning: " << l << "\n";);
s.assign(l, justification());
@ -224,9 +228,10 @@ namespace sat {
return false;
}
}
m_counter -= c.size();
if (m_asymm_branch_all) return process_all(c);
m_counter -= c.size();
// try asymmetric branching
// clause must not be used for propagation
scoped_detach scoped_d(s, c);