Added support for libxsmm in the eigen makefiles

cmake/FindXsmm.cmake

@@ -0,0 +1,24 @@
+# libxsmm
+
+if (XSMM_INCLUDES AND XSMM_LIBRARIES)
+  set(XSMM_FIND_QUIETLY TRUE)
+endif (XSMM_INCLUDES AND XSMM_LIBRARIES)
+
+find_path(XSMM_INCLUDES 
+  NAMES 
+  scotch.h 
+  PATHS 
+  $ENV{XSMMDIR} 
+  ${INCLUDE_INSTALL_DIR} 
+  PATH_SUFFIXES 
+  scotch
+)
+
+
+find_library(XSMM_LIBRARIES xsmm PATHS $ENV{XSMMDIR} ${LIB_INSTALL_DIR})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(XSMM DEFAULT_MSG
+                                  XSMM_INCLUDES XSMM_LIBRARIES)
+
+mark_as_advanced(XSMM_INCLUDES XSMM_LIBRARIES)

unsupported/test/CMakeLists.txt

@@ -21,6 +21,15 @@ include_directories(../../test ../../unsupported ../../Eigen
 
 find_package (Threads)
 
+find_package(Xsmm)
+if(XSMM_FOUND)
+  add_definitions("-DEIGEN_USE_LIBXSMM")
+  include_directories(${XSMM_INCLUDES})
+  ei_add_property(EIGEN_TESTED_BACKENDS  "Xsmm, ")
+else(XSMM_FOUND)
+  ei_add_property(EIGEN_MISSING_BACKENDS  "Xsmm, ")
+endif(XSMM_FOUND)
+
 find_package(GoogleHash)
 if(GOOGLEHASH_FOUND)
   add_definitions("-DEIGEN_GOOGLEHASH_SUPPORT")