From f697df723798779bc29d9f7299bb5398767d5db0 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Wed, 14 Jan 2015 15:38:48 -0800
Subject: Improved support for RowMajor tensors Misc fixes and API cleanups.

---
 .../Eigen/CXX11/src/Tensor/TensorConcatenation.h   | 75 +++++++++++++++++-----
 1 file changed, 58 insertions(+), 17 deletions(-)

(limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorConcatenation.h')

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorConcatenation.h b/unsupported/Eigen/CXX11/src/Tensor/TensorConcatenation.h
index 74485b15b..fb4e7fb11 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorConcatenation.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorConcatenation.h
@@ -35,6 +35,8 @@ struct traits<TensorConcatenationOp<Axis, LhsXprType, RhsXprType> >
   typedef typename RhsXprType::Nested RhsNested;
   typedef typename remove_reference<LhsNested>::type _LhsNested;
   typedef typename remove_reference<RhsNested>::type _RhsNested;
+  static const int NumDimensions = traits<LhsXprType>::NumDimensions;
+  static const int Layout = traits<LhsXprType>::Layout;
   enum { Flags = 0 };
 };
 
@@ -103,11 +105,13 @@ struct TensorEvaluator<const TensorConcatenationOp<Axis, LeftArgType, RightArgTy
   enum {
     IsAligned = false,
     PacketAccess = TensorEvaluator<LeftArgType, Device>::PacketAccess & TensorEvaluator<RightArgType, Device>::PacketAccess,
+    Layout = TensorEvaluator<LeftArgType, Device>::Layout,
   };
 
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TensorEvaluator(const XprType& op, const Device& device)
     : m_leftImpl(op.lhsExpression(), device), m_rightImpl(op.rhsExpression(), device), m_axis(op.axis())
   {
+    EIGEN_STATIC_ASSERT((TensorEvaluator<LeftArgType, Device>::Layout == TensorEvaluator<RightArgType, Device>::Layout || NumDims == 1), YOU_MADE_A_PROGRAMMING_MISTAKE);
     EIGEN_STATIC_ASSERT(NumDims == RightNumDims, YOU_MADE_A_PROGRAMMING_MISTAKE)
     eigen_assert(0 <= m_axis && m_axis < NumDims);
     const Dimensions& lhs_dims = m_leftImpl.dimensions();
@@ -127,13 +131,26 @@ struct TensorEvaluator<const TensorConcatenationOp<Axis, LeftArgType, RightArgTy
       m_dimensions[i] = lhs_dims[i];
     }
 
-    m_leftStrides[0] = 1;
-    m_rightStrides[0] = 1;
-    m_outputStrides[0] = 1;
-    for (int i = 1; i < NumDims; ++i) {
-      m_leftStrides[i] = m_leftStrides[i-1] * lhs_dims[i-1];
-      m_rightStrides[i] = m_rightStrides[i-1] * rhs_dims[i-1];
-      m_outputStrides[i] = m_outputStrides[i-1] * m_dimensions[i-1];
+    if (Layout == ColMajor) {
+      m_leftStrides[0] = 1;
+      m_rightStrides[0] = 1;
+      m_outputStrides[0] = 1;
+
+      for (int i = 1; i < NumDims; ++i) {
+        m_leftStrides[i] = m_leftStrides[i-1] * lhs_dims[i-1];
+        m_rightStrides[i] = m_rightStrides[i-1] * rhs_dims[i-1];
+        m_outputStrides[i] = m_outputStrides[i-1] * m_dimensions[i-1];
+      }
+    } else {
+      m_leftStrides[NumDims - 1] = 1;
+      m_rightStrides[NumDims - 1] = 1;
+      m_outputStrides[NumDims - 1] = 1;
+
+      for (int i = NumDims - 2; i >= 0; --i) {
+        m_leftStrides[i] = m_leftStrides[i+1] * lhs_dims[i+1];
+        m_rightStrides[i] = m_rightStrides[i+1] * rhs_dims[i+1];
+        m_outputStrides[i] = m_outputStrides[i+1] * m_dimensions[i+1];
+      }
     }
   }
 
@@ -159,25 +176,49 @@ struct TensorEvaluator<const TensorConcatenationOp<Axis, LeftArgType, RightArgTy
   {
     // Collect dimension-wise indices (subs).
     array<Index, NumDims> subs;
-    for (int i = NumDims - 1; i > 0; --i) {
-      subs[i] = index / m_outputStrides[i];
-      index -= subs[i] * m_outputStrides[i];
+    if (Layout == ColMajor) {
+      for (int i = NumDims - 1; i > 0; --i) {
+        subs[i] = index / m_outputStrides[i];
+        index -= subs[i] * m_outputStrides[i];
+      }
+      subs[0] = index;
+    } else {
+      for (int i = 0; i < NumDims - 1; ++i) {
+        subs[i] = index / m_outputStrides[i];
+        index -= subs[i] * m_outputStrides[i];
+      }
+      subs[NumDims - 1] = index;
     }
-    subs[0] = index;
 
     const Dimensions& left_dims = m_leftImpl.dimensions();
     if (subs[m_axis] < left_dims[m_axis]) {
-      Index left_index = subs[0];
-      for (int i = 1; i < NumDims; ++i) {
-        left_index += (subs[i] % left_dims[i]) * m_leftStrides[i];
+      Index left_index;
+      if (Layout == ColMajor) {
+        left_index = subs[0];
+        for (int i = 1; i < NumDims; ++i) {
+          left_index += (subs[i] % left_dims[i]) * m_leftStrides[i];
+        }
+      } else {
+        left_index = subs[NumDims - 1];
+        for (int i = NumDims - 2; i >= 0; --i) {
+          left_index += (subs[i] % left_dims[i]) * m_leftStrides[i];
+        }
       }
       return m_leftImpl.coeff(left_index);
     } else {
       subs[m_axis] -= left_dims[m_axis];
       const Dimensions& right_dims = m_rightImpl.dimensions();
-      Index right_index = subs[0];
-      for (int i = 1; i < NumDims; ++i) {
-        right_index += (subs[i] % right_dims[i]) * m_rightStrides[i];
+      Index right_index;
+      if (Layout == ColMajor) {
+        right_index = subs[0];
+        for (int i = 1; i < NumDims; ++i) {
+          right_index += (subs[i] % right_dims[i]) * m_rightStrides[i];
+        }
+      } else {
+        right_index = subs[NumDims - 1];
+        for (int i = NumDims - 2; i >= 0; --i) {
+          right_index += (subs[i] % right_dims[i]) * m_rightStrides[i];
+        }
       }
       return m_rightImpl.coeff(right_index);
     }
-- 
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