public void Pdg_PostDominateIfElse()
        {
            ProcedureBuilder m = new ProcedureBuilder();
            m.BranchIf(m.Local32("a"), "then");
            m.Assign(m.Local32("b"), m.Int32(0));
            m.Goto("join");
            m.Label("then");
            m.Assign(m.Local32("c"), m.Int32(0));
            m.Label("join");
            m.Return();

            FindPostDominators(m);
        }
        private Procedure BuildSimpleLoop()
        {
            ProcedureBuilder m = new ProcedureBuilder();
            Identifier p = m.Local32("p");
            m.Assign(p, 0);

            m.Label("loop");
            m.BranchIf(m.Eq(p, 0x4000), "done");
            m.Store(m.IAdd(p, 0x3000), m.Int32(0));
            m.Assign(p, m.IAdd(p, 4));
            m.Goto("loop");

            m.Label("done");
            m.Return();
            return m.Procedure;
        }
        public void Pdg_PostdominateLoop()
        {
            ProcedureBuilder m = new ProcedureBuilder();
            m.Goto("test");
            m.Label("test");
            m.BranchIf(m.LocalBool("f"), "done");
            m.Label("body");
            m.Store(m.Int32(30), m.Int32(0));
            m.Goto("test");
            m.Label("done");
            m.Return();

            FindPostDominators(m);
            string sExp = 
                "body (4): idom test (3)" + nl +
                "done (5): idom ProcedureBuilder_exit (6)" + nl +
                "l1 (2): idom test (3)" + nl +
                "ProcedureBuilder_entry (1): idom l1 (2)" + nl +
                "ProcedureBuilder_exit (6): idom " + nl +
                "test (3): idom done (5)" + nl;
            Console.WriteLine(sw.ToString());
            Assert.AreEqual(sExp, sw.ToString());
        }
        public void Pdg_InfiniteLoop()
        {
            ProcedureBuilder m = new ProcedureBuilder();
            m.Label("Infinity");
            m.BranchIf(m.Eq(m.LoadW(m.Word16(0x1234)), 0), "hop");
            m.SideEffect(m.Fn("foo"));
            m.Label("hop");
            m.BranchIf(m.Eq(m.LoadW(m.Word16(0x5123)), 1), "Infinity");
            m.SideEffect(m.Fn("bar"));
            m.Goto("Infinity");
            m.Return();

            FindPostDominators(m);
            string sExp = 
                "hop (4): idom ProcedureBuilder_exit (6)" + nl +
                "Infinity (2): idom hop (4)" + nl +
                "l1 (3): idom hop (4)" + nl +
                "l2 (5): idom ProcedureBuilder_exit (6)" + nl +
                "ProcedureBuilder_entry (1): idom Infinity (2)" + nl +
                "ProcedureBuilder_exit (6): idom " + nl;
            Assert.AreEqual(sExp, sw.ToString());
        }
        public void Pdg_LoopWithIfElse()
        {
            var m = new ProcedureBuilder();
            var c = m.Declare(PrimitiveType.Word32, "c");
            var f = m.Declare(PrimitiveType.Bool, "f");
            m.Label("loopHead");
            m.BranchIf(m.Eq(c, 0), "done");
            m.BranchIf(f, "then");
            m.Label("else");
            m.SideEffect(m.Fn("CallElse"));
            m.Goto("loopHead");
            m.Label("then");
            m.SideEffect(m.Fn("CallThen"));
            m.Goto("loopHead");
            m.Label("done");
            m.Return();

            FindPostDominators(m);

            string sExp =
                "done (6): idom ProcedureBuilder_exit (7)" + nl +
                "else (4): idom loopHead (2)" + nl +
                "l1 (3): idom loopHead (2)" + nl +
                "loopHead (2): idom done (6)" + nl +
                "ProcedureBuilder_entry (1): idom loopHead (2)" + nl +
                "ProcedureBuilder_exit (7): idom " + nl +
                "then (5): idom loopHead (2)" + nl;
            Assert.AreEqual(sExp, sw.ToString());
        }