/// <summary>
		/// Builds a strongly connected component corresponding to:
		/// a1 = 0
		/// a2 = phi(a1, a3)
		/// while (a2 != 10)
		/// {
		///    a3 = a2 + 4
		/// }
		/// </summary>
		private List<SsaIdentifier> BuildScc()
		{
            var m = new ProcedureBuilder("test");
			Identifier a = new Identifier("a", PrimitiveType.Word32, null);
            m.Label("b1");
            m.Assign(a, Constant.Word32(0));
            m.Label("b2");
            m.Assign(a, m.IAdd(a, 4));
            m.BranchIf(m.Ne(a, 10), "b2");
            m.Label("b3");
            m.Return();
            this.dom = m.Procedure.CreateBlockDominatorGraph();
            var ssa = new SsaTransform(
                new ProgramDataFlow(),
                m.Procedure,
                null, 
                dom,
                new HashSet<RegisterStorage>());

            /*
            
            proc = new Procedure("test", new Frame(PrimitiveType.Word32));
			Block b1 = proc.AddBlock("b1");
			Block b2 = proc.AddBlock("b2");

			Identifier a2 = new Identifier("a2", PrimitiveType.Word32, null);
			Identifier a3 = new Identifier("a3", PrimitiveType.Word32, null);
			PhiFunction phi = new PhiFunction(a1.DataType, new Expression [] { a1, a3 });

			Statement stm_a1 = new Statement(0, new Assignment(a1, Constant.Word32(0)), null);
			Statement stm_a2 = new Statement(0, new PhiAssignment(a2, new PhiFunction(a1.DataType,  a1, a3 )), null);
			Statement stm_ex = new Statement(0, new Branch(new BinaryExpression(Operator.Ne, PrimitiveType.Bool, a2, Constant.Word32(10)), b2), null);
			Statement stm_a3 = new Statement(0, new Assignment(a3, new BinaryExpression(Operator.IAdd, a3.DataType, a2, Constant.Word32(4))), null);
			b1.Statements.Add(stm_a1);

			b2.Statements.Add(stm_a2);
			b2.Statements.Add(stm_a3);

			SsaIdentifier sid_a1 = new SsaIdentifier(a1, a1, stm_a1, ((Assignment)stm_a1.Instruction).Src, false);
            SsaIdentifier sid_a2 = new SsaIdentifier(a2, a2, stm_a2, ((PhiAssignment) stm_a2.Instruction).Src, false);
            SsaIdentifier sid_a3 = new SsaIdentifier(a3, a3, stm_a3, ((Assignment) stm_a3.Instruction).Src, false);
			sid_a1.Uses.Add(stm_a2);
			ssaIds = new SsaIdentifierCollection();
			ssaIds.Add(a1, sid_a1);
			ssaIds.Add(a2, sid_a2);
			ssaIds.Add(a3, sid_a3);
            */
            ssaIds = ssa.SsaState.Identifiers;
            List<SsaIdentifier> list = new List<SsaIdentifier> {
                ssaIds.Where(i => i.Identifier.Name == "a_0").Single(),
                ssaIds.Where(i => i.Identifier.Name == "a_1").Single(),
                ssaIds.Where(i => i.Identifier.Name == "a_2").Single(),
            };
			return list;
		}