Partial OpenCL support via SYCL compatible with ComputeCpp CE.

unsupported/Eigen/CXX11/src/Tensor/TensorSycl.h

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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Mehdi Goli    Codeplay Software Ltd.
+// Ralph Potter  Codeplay Software Ltd.
+// Luke Iwanski  Codeplay Software Ltd.
+// Contact: eigen@codeplay.com
+//
+// 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/.
+
+// General include header of SYCL target for Tensor Module
+#ifndef TENSORSYCL_H
+#define TENSORSYCL_H
+
+#ifdef EIGEN_USE_SYCL
+
+// trait class to extract different attribute contents
+template <typename T>
+struct Trait;
+// global pointer to set different attribute state for a class
+template <class T>
+struct MakeGlobalPointer {
+  typedef typename cl::sycl::global_ptr<T>::pointer_t Type;
+};
+
+// tuple construction
+#include "TensorSyclTuple.h"
+
+// This file contains the PlaceHolder that replaces the actual data
+#include "TensorSyclPlaceHolder.h"
+
+#include "TensorSyclLeafCount.h"
+
+// The index PlaceHolder takes the actual expression and replaces the actual
+// data on it with the place holder. It uses the same pre-order expression tree
+// traverse as the leaf count in order to give the right access number to each
+// node in the expression
+#include "TensorSyclPlaceHolderExpr.h"
+
+// creation of an accessor tuple from a tuple of SYCL buffers
+#include "TensorSyclExtractAccessor.h"
+
+// actual data extraction using accessors
+//#include "GetDeviceData.h"
+
+// this is used to change the address space type in tensor map for GPU
+#include "TensorSyclConvertToDeviceExpression.h"
+
+// this is used to extract the functors
+#include "TensorSyclExtractFunctors.h"
+
+// this is used to create tensormap on the device
+// this is used to construct the expression on the device
+#include "TensorSyclExprConstructor.h"
+
+// kernel execution using fusion
+#include "TensorSyclRun.h"
+
+#endif  // end of EIGEN_USE_SYCL
+#endif  // TENSORSYCL_H