add bit-matrix, avoid flattening and/or after bit-blasting, split pdd_grobner into solver/simplifier, add xlin, add smtfd option for incremental mode logic

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/math/grobner/pdd_simplifier.h

@@ -0,0 +1,55 @@
+/*++
+  Copyright (c) 2017 Microsoft Corporation
+
+
+  Abstract:
+
+    simplification routines for pdd polys
+
+  Author:
+    Nikolaj Bjorner (nbjorner)
+    Lev Nachmanson (levnach)
+
+  --*/
+#pragma once
+
+#include "math/grobner/pdd_solver.h"
+
+namespace dd {
+
+class simplifier {
+
+    typedef solver::equation equation;
+    typedef ptr_vector<equation> equation_vector;
+
+    solver& s;
+public:
+
+    simplifier(solver& s): s(s) {}
+    ~simplifier() {}
+
+    void operator()();
+
+private:
+
+    struct compare_top_var;
+    bool simplify_linear_step(bool binary);
+    bool simplify_linear_step(equation_vector& linear);
+    typedef vector<equation_vector> use_list_t;
+    use_list_t get_use_list();
+    void add_to_use(equation* e, use_list_t& use_list);
+    void remove_from_use(equation* e, use_list_t& use_list);
+    void remove_from_use(equation* e, use_list_t& use_list, unsigned except_v);
+
+    bool simplify_cc_step();
+    bool simplify_elim_pure_step();
+    bool simplify_elim_dual_step();
+    bool simplify_leaf_step();
+    bool simplify_exlin();
+    void exlin_augment(vector<pdd>& eqs);
+    void simplify_exlin(vector<pdd> const& eqs, vector<pdd>& simp_eqs);
+
+
+};
+
+}