Partial OpenCL support via SYCL compatible with ComputeCpp CE.

Eigen/Core

@@ -51,7 +51,40 @@
   #define EIGEN_USING_STD_MATH(FUNC) using std::FUNC;
 #endif
 
-#if (defined(_CPPUNWIND) || defined(__EXCEPTIONS)) && !defined(__CUDA_ARCH__) && !defined(EIGEN_EXCEPTIONS)
+#ifdef EIGEN_USE_SYCL
+#undef min
+#undef max
+#undef isnan
+#undef isinf
+#undef isfinite
+#include <SYCL/sycl.hpp>
+#endif
+
+// We need these predefines to determine if asserts need to be disabled for the device compiler
+#if defined(__SYCL_DEVICE_ONLY__)
+  // Do not try asserts on SYCL!
+  #ifndef EIGEN_NO_DEBUG
+  #define EIGEN_NO_DEBUG
+  #endif
+
+  #ifdef EIGEN_INTERNAL_DEBUGGING
+  #undef EIGEN_INTERNAL_DEBUGGING
+  #endif
+
+  // Do not try to vectorize on SYCL!
+  #ifndef EIGEN_DONT_VECTORIZE
+  #define EIGEN_DONT_VECTORIZE
+  #endif
+
+  #ifdef EIGEN_EXCEPTIONS
+  #undef EIGEN_EXCEPTIONS
+  #endif
+
+  #define EIGEN_DEVICE_FUNC
+
+#endif
+
+#if (defined(_CPPUNWIND) || defined(__EXCEPTIONS)) && !defined(__CUDA_ARCH__) && !defined(EIGEN_EXCEPTIONS) && !defined(EIGEN_USE_SYCL)
   #define EIGEN_EXCEPTIONS
 #endif