Squashed 'third_party/eigen/' content from commit 61d72f6

Change-Id: Iccc90fa0b55ab44037f018046d2fcffd90d9d025
git-subtree-dir: third_party/eigen
git-subtree-split: 61d72f6383cfa842868c53e30e087b0258177257
diff --git a/test/bicgstab.cpp b/test/bicgstab.cpp
new file mode 100644
index 0000000..f327e2f
--- /dev/null
+++ b/test/bicgstab.cpp
@@ -0,0 +1,30 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2011 Gael Guennebaud <g.gael@free.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include "sparse_solver.h"
+#include <Eigen/IterativeLinearSolvers>
+
+template<typename T> void test_bicgstab_T()
+{
+  BiCGSTAB<SparseMatrix<T>, DiagonalPreconditioner<T> > bicgstab_colmajor_diag;
+  BiCGSTAB<SparseMatrix<T>, IdentityPreconditioner    > bicgstab_colmajor_I;
+  BiCGSTAB<SparseMatrix<T>, IncompleteLUT<T> >           bicgstab_colmajor_ilut;
+  //BiCGSTAB<SparseMatrix<T>, SSORPreconditioner<T> >     bicgstab_colmajor_ssor;
+
+  CALL_SUBTEST( check_sparse_square_solving(bicgstab_colmajor_diag)  );
+//   CALL_SUBTEST( check_sparse_square_solving(bicgstab_colmajor_I)     );
+  CALL_SUBTEST( check_sparse_square_solving(bicgstab_colmajor_ilut)     );
+  //CALL_SUBTEST( check_sparse_square_solving(bicgstab_colmajor_ssor)     );
+}
+
+void test_bicgstab()
+{
+  CALL_SUBTEST_1(test_bicgstab_T<double>());
+  CALL_SUBTEST_2(test_bicgstab_T<std::complex<double> >());
+}