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add simplifiation pass

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-02-22 11:21:53 -08:00
parent ab9bcfdcce
commit d1e95a133b
10 changed files with 115 additions and 36 deletions
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31
src/sat/sat_aig_cuts.cpp
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@ -18,6 +18,7 @@
#include "util/trace.h"
#include "sat/sat_aig_cuts.h"
#include "sat/sat_solver.h"
#include "sat/sat_lut_finder.h"
namespace sat {
@ -762,6 +763,34 @@ namespace sat {
cut2def(on_clause, c, literal(v, true));
}
/**
* simplify a set of cuts by removing don't cares.
*/
void aig_cuts::simplify() {
uint64_t masks[7];
for (unsigned i = 0; i <= 6; ++i) {
masks[i] = cut::effect_mask(i);
}
unsigned dont_cares = 0;
for (cut_set & cs : m_cuts) {
for (cut const& c : cs) {
uint64_t t = c.table();
for (unsigned i = 0; i < std::min(6u, c.size()); ++i) {
uint64_t diff = masks[i] & (t ^ (t >> (1ull << i)));
if (diff == 0ull) {
cut d(c);
d.remove_elem(i);
cs.insert(m_on_cut_add, m_on_cut_del, d);
cs.evict(m_on_cut_del, c);
++dont_cares;
break;
}
}
}
}
IF_VERBOSE(0, verbose_stream() << "#don't cares " << dont_cares << "\n");
}
struct aig_cuts::validator {
aig_cuts& t;
params_ref p;
@ -821,7 +850,7 @@ namespace sat {
cut2def(on_clause, c, literal(v, false));
node2def(on_clause, n, literal(v, true));
val.check();
}
}
std::ostream& aig_cuts::display(std::ostream& out) const {
auto ids = filter_valid_nodes();