Z3 sources

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/sat_asymm_branch.h

@@ -0,0 +1,60 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    sat_asymm_branch.h
+
+Abstract:
+
+    SAT solver asymmetric branching
+
+Author:
+
+    Leonardo de Moura (leonardo) 2011-05-30.
+
+Revision History:
+
+--*/
+#ifndef _SAT_ASYMM_BRANCH_H_
+#define _SAT_ASYMM_BRANCH_H_
+
+#include"sat_types.h"
+#include"statistics.h"
+#include"params.h"
+
+namespace sat {
+    class solver;
+
+    class asymm_branch {
+        struct report;
+        
+        solver & s;
+        int      m_counter;
+
+        // config
+        bool                   m_asymm_branch;
+        unsigned               m_asymm_branch_rounds;
+        unsigned               m_asymm_branch_limit;
+
+        // stats
+        unsigned m_elim_literals;
+
+        bool process(clause & c);
+    public:
+        asymm_branch(solver & s, params_ref const & p);
+
+        void operator()(bool force = false);
+
+        void updt_params(params_ref const & p);
+        static void collect_param_descrs(param_descrs & d);
+
+        void collect_statistics(statistics & st);
+        void reset_statistics();
+
+        void dec(unsigned c) { m_counter -= c; }
+    };
+
+};
+
+#endif