summaryrefslogtreecommitdiff
path: root/libs/ezsat
diff options
context:
space:
mode:
Diffstat (limited to 'libs/ezsat')
-rw-r--r--libs/ezsat/ezsat.cc49
-rw-r--r--libs/ezsat/ezsat.h3
2 files changed, 46 insertions, 6 deletions
diff --git a/libs/ezsat/ezsat.cc b/libs/ezsat/ezsat.cc
index b713c4c9..1224fd3a 100644
--- a/libs/ezsat/ezsat.cc
+++ b/libs/ezsat/ezsat.cc
@@ -42,6 +42,8 @@ static std::string my_int_to_string(int i)
ezSAT::ezSAT()
{
+ statehash = 5381;
+
flag_keep_cnf = false;
flag_non_incremental = false;
@@ -65,6 +67,11 @@ ezSAT::~ezSAT()
{
}
+void ezSAT::addhash(unsigned int h)
+{
+ statehash = ((statehash << 5) + statehash) ^ h;
+}
+
int ezSAT::value(bool val)
{
return val ? CONST_TRUE : CONST_FALSE;
@@ -113,8 +120,14 @@ int ezSAT::expression(OpId op, const std::vector<int> &args)
myArgs.reserve(args.size());
bool xorRemovedOddTrues = false;
+ addhash(__LINE__);
+ addhash(op);
+
for (auto arg : args)
{
+ addhash(__LINE__);
+ addhash(arg);
+
if (arg == 0)
continue;
if (op == OpAnd && arg == CONST_TRUE)
@@ -200,7 +213,13 @@ int ezSAT::expression(OpId op, const std::vector<int> &args)
expressions.push_back(myExpr);
}
- return xorRemovedOddTrues ? NOT(id) : id;
+ if (xorRemovedOddTrues)
+ id = NOT(id);
+
+ addhash(__LINE__);
+ addhash(id);
+
+ return id;
}
void ezSAT::lookup_literal(int id, std::string &name) const
@@ -387,6 +406,9 @@ bool ezSAT::eliminated(int)
void ezSAT::assume(int id)
{
+ addhash(__LINE__);
+ addhash(id);
+
if (id < 0)
{
assert(0 < -id && -id <= int(expressions.size()));
@@ -429,6 +451,10 @@ void ezSAT::assume(int id)
void ezSAT::add_clause(const std::vector<int> &args)
{
+ addhash(__LINE__);
+ for (auto arg : args)
+ addhash(arg);
+
cnfClauses.push_back(args);
cnfClausesCount++;
}
@@ -519,6 +545,10 @@ std::string ezSAT::cnfLiteralInfo(int idx) const
int ezSAT::bind(int id, bool auto_freeze)
{
+ addhash(__LINE__);
+ addhash(id);
+ addhash(auto_freeze);
+
if (id >= 0) {
assert(0 < id && id <= int(literals.size()));
cnfLiteralVariables.resize(literals.size());
@@ -561,10 +591,13 @@ int ezSAT::bind(int id, bool auto_freeze)
while (args.size() > 1) {
std::vector<int> newArgs;
for (int i = 0; i < int(args.size()); i += 2)
- if (i+1 == int(args.size()))
+ if (i+1 == int(args.size())) {
newArgs.push_back(args[i]);
- else
- newArgs.push_back(OR(AND(args[i], NOT(args[i+1])), AND(NOT(args[i]), args[i+1])));
+ } else {
+ int sub1 = AND(args[i], NOT(args[i+1]));
+ int sub2 = AND(NOT(args[i]), args[i+1]);
+ newArgs.push_back(OR(sub1, sub2));
+ }
args.swap(newArgs);
}
idx = bind(args.at(0), false);
@@ -575,12 +608,16 @@ int ezSAT::bind(int id, bool auto_freeze)
std::vector<int> invArgs;
for (auto arg : args)
invArgs.push_back(NOT(arg));
- idx = bind(OR(expression(OpAnd, args), expression(OpAnd, invArgs)), false);
+ int sub1 = expression(OpAnd, args);
+ int sub2 = expression(OpAnd, invArgs);
+ idx = bind(OR(sub1, sub2), false);
goto assign_idx;
}
if (op == OpITE) {
- idx = bind(OR(AND(args[0], args[1]), AND(NOT(args[0]), args[2])), false);
+ int sub1 = AND(args[0], args[1]);
+ int sub2 = AND(NOT(args[0]), args[2]);
+ idx = bind(OR(sub1, sub2), false);
goto assign_idx;
}
diff --git a/libs/ezsat/ezsat.h b/libs/ezsat/ezsat.h
index 5c8c1ed0..a20713bc 100644
--- a/libs/ezsat/ezsat.h
+++ b/libs/ezsat/ezsat.h
@@ -83,6 +83,9 @@ public:
ezSAT();
virtual ~ezSAT();
+ unsigned int statehash;
+ void addhash(unsigned int);
+
void keep_cnf() { flag_keep_cnf = true; }
void non_incremental() { flag_non_incremental = true; }