From 4b36c3591f247d4be38e5a12dbed7ac0d1ad2bff Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Fri, 10 Oct 2014 15:43:21 -0700
Subject: Fixed the tensor shuffling test

---
 .../Eigen/CXX11/src/Tensor/TensorDimensions.h      | 133 ++++++++++++++++++++-
 .../Eigen/CXX11/src/Tensor/TensorExecutor.h        |   8 +-
 unsupported/test/CMakeLists.txt                    |   2 +-
 unsupported/test/cxx11_tensor_fixed_size.cpp       |   2 +-
 unsupported/test/cxx11_tensor_shuffling.cpp        |   9 +-
 5 files changed, 141 insertions(+), 13 deletions(-)

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorDimensions.h b/unsupported/Eigen/CXX11/src/Tensor/TensorDimensions.h
index 11590b474..732c6b344 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorDimensions.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorDimensions.h
@@ -37,8 +37,7 @@ template <typename Index> struct IndexPair {
   Index second;
 };
 
-
-// Boiler plate code
+// Boilerplate code
 namespace internal {
 
 template<std::size_t n, typename Dimension> struct dget {
@@ -110,6 +109,11 @@ struct Sizes : internal::numeric_list<std::size_t, Indices...> {
   }
 };
 
+template <typename std::size_t... Indices>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE std::size_t array_prod(const Sizes<Indices...>&) {
+  return Sizes<Indices...>::total_size;
+}
+
 #else
 
 template <std::size_t n>
@@ -136,9 +140,21 @@ template <std::size_t V1=0, std::size_t V2=0, std::size_t V3=0, std::size_t V4=0
     // todo: add assertion
   }
 #ifdef EIGEN_HAS_VARIADIC_TEMPLATES
+  template <typename... DenseIndex> Sizes(DenseIndex... indices) { }
   explicit Sizes(std::initializer_list<std::size_t> l) {
     // todo: add assertion
   }
+#else
+  EIGEN_DEVICE_FUNC explicit Sizes(const DenseIndex i0) {
+  }
+  EIGEN_DEVICE_FUNC explicit Sizes(const DenseIndex i0, const DenseIndex i1) {
+  }
+  EIGEN_DEVICE_FUNC explicit Sizes(const DenseIndex i0, const DenseIndex i1, const DenseIndex i2) {
+  }
+  EIGEN_DEVICE_FUNC explicit Sizes(const DenseIndex i0, const DenseIndex i1, const DenseIndex i2, const DenseIndex i3) {
+  }
+  EIGEN_DEVICE_FUNC explicit Sizes(const DenseIndex i0, const DenseIndex i1, const DenseIndex i2, const DenseIndex i3, const DenseIndex i4) {
+  }
 #endif
 
   template <typename T> Sizes& operator = (const T& other) {
@@ -156,9 +172,14 @@ template <std::size_t V1=0, std::size_t V2=0, std::size_t V3=0, std::size_t V4=0
   }
 };
 
+template <std::size_t V1, std::size_t V2, std::size_t V3, std::size_t V4, std::size_t V5>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE std::size_t array_prod(const Sizes<V1, V2, V3, V4, V5>&) {
+  return Sizes<V1, V2, V3, V4, V5>::total_size;
+};
+
 #endif
 
-// Boiler plate
+// Boilerplate
 namespace internal {
 template<typename Index, std::size_t NumIndices, std::size_t n, bool RowMajor>
 struct tensor_index_linearization_helper
@@ -243,6 +264,112 @@ struct DSizes : array<DenseIndex, NumDims> {
 };
 
 
+
+
+// Boilerplate
+namespace internal {
+template<typename Index, std::size_t NumIndices, std::size_t n, bool RowMajor>
+struct tensor_vsize_index_linearization_helper
+{
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+  Index run(array<Index, NumIndices> const& indices, std::vector<DenseIndex> const& dimensions)
+  {
+    return array_get<RowMajor ? n : (NumIndices - n - 1)>(indices) +
+      array_get<RowMajor ? n : (NumIndices - n - 1)>(dimensions) *
+        tensor_vsize_index_linearization_helper<Index, NumIndices, n - 1, RowMajor>::run(indices, dimensions);
+  }
+};
+
+template<typename Index, std::size_t NumIndices, bool RowMajor>
+struct tensor_vsize_index_linearization_helper<Index, NumIndices, 0, RowMajor>
+{
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+  Index run(array<Index, NumIndices> const& indices, std::vector<DenseIndex> const&)
+  {
+    return array_get<RowMajor ? 0 : NumIndices - 1>(indices);
+  }
+};
+}  // end namespace internal
+
+template <typename DenseIndex>
+struct VSizes : std::vector<DenseIndex> {
+  typedef std::vector<DenseIndex> Base;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE size_t TotalSize() const {
+    return internal::array_prod(*static_cast<const Base*>(this));
+  }
+
+  EIGEN_DEVICE_FUNC VSizes() { }
+  EIGEN_DEVICE_FUNC explicit VSizes(const std::vector<DenseIndex>& a) : Base(a) { }
+
+  template <std::size_t NumDims>
+  EIGEN_DEVICE_FUNC explicit VSizes(const array<DenseIndex, NumDims>& a) {
+    this->resize(NumDims);
+    for (int i = 0; i < NumDims; ++i) {
+      (*this)[i] = a[i];
+    }
+  }
+
+  EIGEN_DEVICE_FUNC explicit VSizes(const DenseIndex i0) {
+    this->resize(1);
+    (*this)[0] = i0;
+  }
+  EIGEN_DEVICE_FUNC explicit VSizes(const DenseIndex i0, const DenseIndex i1) {
+    this->resize(2);
+    (*this)[0] = i0;
+    (*this)[1] = i1;
+  }
+  EIGEN_DEVICE_FUNC explicit VSizes(const DenseIndex i0, const DenseIndex i1, const DenseIndex i2) {
+    this->resize(3);
+    (*this)[0] = i0;
+    (*this)[1] = i1;
+    (*this)[2] = i2;
+  }
+  EIGEN_DEVICE_FUNC explicit VSizes(const DenseIndex i0, const DenseIndex i1, const DenseIndex i2, const DenseIndex i3) {
+    this->resize(4);
+    (*this)[0] = i0;
+    (*this)[1] = i1;
+    (*this)[2] = i2;
+    (*this)[3] = i3;
+  }
+  EIGEN_DEVICE_FUNC explicit VSizes(const DenseIndex i0, const DenseIndex i1, const DenseIndex i2, const DenseIndex i3, const DenseIndex i4) {
+    this->resize(5);
+    (*this)[0] = i0;
+    (*this)[1] = i1;
+    (*this)[2] = i2;
+    (*this)[3] = i3;
+    (*this)[4] = i4;
+  }
+
+  VSizes& operator = (const std::vector<DenseIndex>& other) {
+    *static_cast<Base*>(this) = other;
+    return *this;
+  }
+
+  // A constexpr would be so much better here
+  template <std::size_t NumDims>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE size_t IndexOfColMajor(const array<DenseIndex, NumDims>& indices) const {
+    return internal::tensor_vsize_index_linearization_helper<DenseIndex, NumDims, NumDims - 1, false>::run(indices, *static_cast<const Base*>(this));
+  }
+  template <std::size_t NumDims>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE size_t IndexOfRowMajor(const array<DenseIndex, NumDims>& indices) const {
+    return internal::tensor_vsize_index_linearization_helper<DenseIndex, NumDims, NumDims - 1, true>::run(indices, *static_cast<const Base*>(this));
+  }
+};
+
+
+// Boilerplate
+namespace internal {
+template <typename DenseIndex>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE DenseIndex array_prod(const VSizes<DenseIndex>& sizes) {
+  DenseIndex total_size = 1;
+  for (int i = 0; i < sizes.size(); ++i) {
+    total_size *= sizes[i];
+  }
+  return total_size;
+}
+}
+
 namespace internal {
 
 template <typename DenseIndex, std::size_t NumDims> struct array_size<const DSizes<DenseIndex, NumDims> > {
diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h b/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h
index 84768ca09..10f5a5ee7 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h
@@ -39,7 +39,7 @@ class TensorExecutor
     const bool needs_assign = evaluator.evalSubExprsIfNeeded(NULL);
     if (needs_assign)
     {
-      const Index size = evaluator.dimensions().TotalSize();
+      const Index size = array_prod(evaluator.dimensions());
       for (Index i = 0; i < size; ++i) {
         evaluator.evalScalar(i);
       }
@@ -60,7 +60,7 @@ class TensorExecutor<Expression, DefaultDevice, true>
     const bool needs_assign = evaluator.evalSubExprsIfNeeded(NULL);
     if (needs_assign)
     {
-      const Index size = evaluator.dimensions().TotalSize();
+      const Index size = array_prod(evaluator.dimensions());
       static const int PacketSize = unpacket_traits<typename TensorEvaluator<Expression, DefaultDevice>::PacketReturnType>::size;
       const int VectorizedSize = (size / PacketSize) * PacketSize;
 
@@ -122,7 +122,7 @@ class TensorExecutor<Expression, ThreadPoolDevice, Vectorizable>
     const bool needs_assign = evaluator.evalSubExprsIfNeeded(NULL);
     if (needs_assign)
     {
-      const Index size = evaluator.dimensions().TotalSize();
+      const Index size = array_prod(evaluator.dimensions());
 
       static const int PacketSize = Vectorizable ? unpacket_traits<typename Evaluator::PacketReturnType>::size : 1;
 
@@ -176,7 +176,7 @@ class TensorExecutor<Expression, GpuDevice, Vectorizable>
       const int num_blocks = getNumCudaMultiProcessors() * maxCudaThreadsPerMultiProcessor() / maxCudaThreadsPerBlock();
       const int block_size = maxCudaThreadsPerBlock();
 
-      const Index size = evaluator.dimensions().TotalSize();
+      const Index size = array_prod(evaluator.dimensions());
       EigenMetaKernel<TensorEvaluator<Expression, GpuDevice> > <<<num_blocks, block_size, 0, device.stream()>>>(evaluator, size);
       assert(cudaGetLastError() == cudaSuccess);
     }
diff --git a/unsupported/test/CMakeLists.txt b/unsupported/test/CMakeLists.txt
index 1c4d0838a..ac2ccaf27 100644
--- a/unsupported/test/CMakeLists.txt
+++ b/unsupported/test/CMakeLists.txt
@@ -119,7 +119,7 @@ if(EIGEN_TEST_CXX11)
   ei_add_test(cxx11_tensor_morphing "-std=c++0x")
   ei_add_test(cxx11_tensor_padding "-std=c++0x")
   ei_add_test(cxx11_tensor_reduction "-std=c++0x")
-#  ei_add_test(cxx11_tensor_shuffling "-std=c++0x")
+  ei_add_test(cxx11_tensor_shuffling "-std=c++0x")
   ei_add_test(cxx11_tensor_striding "-std=c++0x")
 #  ei_add_test(cxx11_tensor_device  "-std=c++0x")
   ei_add_test(cxx11_tensor_thread_pool "-std=c++0x")
diff --git a/unsupported/test/cxx11_tensor_fixed_size.cpp b/unsupported/test/cxx11_tensor_fixed_size.cpp
index d270486f2..b0501aaa3 100644
--- a/unsupported/test/cxx11_tensor_fixed_size.cpp
+++ b/unsupported/test/cxx11_tensor_fixed_size.cpp
@@ -179,7 +179,7 @@ static void test_array()
   for (int i = 0; i < 2; ++i) {
     for (int j = 0; j < 3; ++j) {
       for (int k = 0; k < 7; ++k) {
-        VERIFY_IS_APPROX(mat3(array<ptrdiff_t, 3>(i,j,k)), powf(val, 3.5f));
+        VERIFY_IS_APPROX(mat3(i,j,k), powf(val, 3.5f));
         val += 1.0;
       }
     }
diff --git a/unsupported/test/cxx11_tensor_shuffling.cpp b/unsupported/test/cxx11_tensor_shuffling.cpp
index 5ab8b6821..39c623499 100644
--- a/unsupported/test/cxx11_tensor_shuffling.cpp
+++ b/unsupported/test/cxx11_tensor_shuffling.cpp
@@ -12,6 +12,7 @@
 #include <Eigen/CXX11/Tensor>
 
 using Eigen::Tensor;
+using Eigen::array;
 
 static void test_simple_shuffling()
 {
@@ -80,10 +81,10 @@ static void test_expr_shuffling()
 
   Tensor<float, 4> result(5,7,3,2);
 
-  array<int, 4> src_slice_dim(Eigen::array<int, 4>(2,3,1,7));
-  array<int, 4> src_slice_start(Eigen::array<int, 4>(0,0,0,0));
-  array<int, 4> dst_slice_dim(Eigen::array<int, 4>(1,7,3,2));
-  array<int, 4> dst_slice_start(Eigen::array<int, 4>(0,0,0,0));
+  array<int, 4> src_slice_dim{{2,3,1,7}};
+  array<int, 4> src_slice_start{{0,0,0,0}};
+  array<int, 4> dst_slice_dim{{1,7,3,2}};
+  array<int, 4> dst_slice_start{{0,0,0,0}};
 
   for (int i = 0; i < 5; ++i) {
     result.slice(dst_slice_start, dst_slice_dim) =
-- 
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