From ef9dfee7bdc8e0d82c9b7ddf9414ef99d866d7ba Mon Sep 17 00:00:00 2001
From: Eugene Zhulenev <ezhulenev@google.com>
Date: Tue, 24 Sep 2019 12:52:45 -0700
Subject: Tensor block evaluation V2 support for unary/binary/broadcsting

---
 unsupported/Eigen/CXX11/src/Tensor/TensorAssign.h | 37 +++++++++++++++++++++++
 1 file changed, 37 insertions(+)

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

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorAssign.h b/unsupported/Eigen/CXX11/src/Tensor/TensorAssign.h
index 270ad974e..29aa7a97e 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorAssign.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorAssign.h
@@ -110,6 +110,8 @@ struct TensorEvaluator<const TensorAssignOp<LeftArgType, RightArgType>, Device>
                         TensorEvaluator<RightArgType, Device>::PacketAccess,
     BlockAccess       = TensorEvaluator<LeftArgType, Device>::BlockAccess &
                         TensorEvaluator<RightArgType, Device>::BlockAccess,
+    BlockAccessV2     = TensorEvaluator<LeftArgType, Device>::BlockAccessV2 &
+                        TensorEvaluator<RightArgType, Device>::BlockAccessV2,
     PreferBlockAccess = TensorEvaluator<LeftArgType, Device>::PreferBlockAccess |
                         TensorEvaluator<RightArgType, Device>::PreferBlockAccess,
     Layout            = TensorEvaluator<LeftArgType, Device>::Layout,
@@ -120,6 +122,18 @@ struct TensorEvaluator<const TensorAssignOp<LeftArgType, RightArgType>, Device>
       typename internal::remove_const<Scalar>::type, Index, NumDims, Layout>
       TensorBlock;
 
+  //===- Tensor block evaluation strategy (see TensorBlock.h) -------------===//
+  typedef internal::TensorBlockDescriptor<NumDims, Index> TensorBlockDesc;
+  typedef internal::TensorBlockScratchAllocator<Device> TensorBlockScratch;
+
+  typedef typename TensorEvaluator<const RightArgType, Device>::TensorBlockV2
+      RightTensorBlock;
+
+  typedef internal::TensorBlockAssignment<
+      Scalar, NumDims, typename RightTensorBlock::XprType, Index>
+      TensorBlockAssignment;
+  //===--------------------------------------------------------------------===//
+
   EIGEN_DEVICE_FUNC TensorEvaluator(const XprType& op, const Device& device) :
       m_leftImpl(op.lhsExpression(), device),
       m_rightImpl(op.rhsExpression(), device)
@@ -214,6 +228,29 @@ struct TensorEvaluator<const TensorAssignOp<LeftArgType, RightArgType>, Device>
       m_leftImpl.writeBlock(*block);
     }
   }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalBlockV2(
+      TensorBlockDesc& desc, TensorBlockScratch& scratch) {
+    if (TensorEvaluator<LeftArgType, Device>::RawAccess &&
+        m_leftImpl.data() != NULL) {
+      // If destination has raw data access, we pass it as a potential
+      // destination for a block descriptor evaluation.
+      desc.AddDestinationBuffer(
+          /*dst_base=*/m_leftImpl.data() + desc.offset(),
+          /*dst_strides=*/internal::strides<Layout>(m_leftImpl.dimensions()),
+          /*total_dst_bytes=*/
+          (internal::array_prod(m_leftImpl.dimensions()) * sizeof(Scalar)));
+    }
+
+    RightTensorBlock block = m_rightImpl.blockV2(desc, scratch);
+    // If block was evaluated into a destination, there is no need to do
+    // assignment.
+    if (block.kind() != internal::TensorBlockKind::kMaterializedInOutput) {
+      m_leftImpl.writeBlockV2(desc, block);
+    }
+    block.cleanup();
+  }
+
 #ifdef EIGEN_USE_SYCL
   // binding placeholder accessors to a command group handler for SYCL
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void bind(cl::sycl::handler &cgh) const {
-- 
cgit v1.2.3