From f0b36fb9a405400e82b73ea70097b8ae3cd1095a Mon Sep 17 00:00:00 2001
From: Eugene Zhulenev <ezhulenev@google.com>
Date: Fri, 30 Aug 2019 15:13:38 -0700
Subject: evalSubExprsIfNeededAsync + async TensorContractionThreadPool

---
 .../Eigen/CXX11/src/Tensor/TensorContraction.h     | 139 ++++++++++++++-------
 1 file changed, 95 insertions(+), 44 deletions(-)

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

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h b/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h
index a398b2b3f..2f8656fbb 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h
@@ -373,13 +373,13 @@ struct TensorContractionEvaluatorBase
   typedef typename Storage::Type EvaluatorPointerType;
 
   enum {
-    IsAligned = true,
-    PacketAccess = (PacketType<CoeffReturnType, Device>::size > 1),
-    BlockAccess = false,
+    IsAligned         = true,
+    PacketAccess      = (PacketType<CoeffReturnType, Device>::size > 1),
+    BlockAccess       = false,
     PreferBlockAccess = false,
-    Layout = TensorEvaluator<LeftArgType, Device>::Layout,
-    CoordAccess = false,  // to be implemented
-    RawAccess = true
+    Layout            = TensorEvaluator<LeftArgType, Device>::Layout,
+    CoordAccess       = false,  // to be implemented
+    RawAccess         = true
   };
 
   // Most of the code is assuming that both input tensors are ColMajor. If the
@@ -390,7 +390,7 @@ struct TensorContractionEvaluatorBase
     static_cast<int>(Layout) == static_cast<int>(ColMajor), LeftArgType, RightArgType>::type EvalLeftArgType;
   typedef typename internal::conditional<
     static_cast<int>(Layout) == static_cast<int>(ColMajor), RightArgType, LeftArgType>::type EvalRightArgType;
-  
+
   typedef TensorEvaluator<EvalLeftArgType, Device> LeftEvaluatorType;
   typedef TensorEvaluator<EvalRightArgType, Device> RightEvaluatorType;
 
@@ -605,48 +605,99 @@ struct TensorContractionEvaluatorBase
     }
   }
 
-#define TENSOR_CONTRACTION_DISPATCH(METHOD, ALIGNMENT, ARGS)   \
-    if (this->m_lhs_inner_dim_contiguous) { \
-      if (this->m_rhs_inner_dim_contiguous) { \
-        if (this->m_rhs_inner_dim_reordered) { \
-          METHOD<true, true, true, ALIGNMENT>ARGS;    \
-        } \
-        else { \
-          METHOD<true, true, false, ALIGNMENT>ARGS; \
-        } \
-      } \
-      else { \
-       if (this->m_rhs_inner_dim_reordered) { \
-          METHOD<true, false, true, ALIGNMENT>ARGS; \
-        } \
-        else { \
-          METHOD<true, false, false, ALIGNMENT>ARGS; \
-        } \
-      } \
-    } \
-    else { \
-      if (this->m_rhs_inner_dim_contiguous) { \
-        if (this->m_rhs_inner_dim_reordered) { \
-          METHOD<false, true, true, ALIGNMENT>ARGS; \
-        } \
-        else { \
-          METHOD<false, true, false, ALIGNMENT>ARGS; \
-        } \
-      } \
-      else { \
-       if (this->m_rhs_inner_dim_reordered) { \
-          METHOD<false, false, true, ALIGNMENT>ARGS; \
-        } \
-        else { \
-          METHOD<false, false, false, ALIGNMENT>ARGS; \
-        } \
-      } \
-    }
+#ifdef EIGEN_USE_THREADS
+  template <typename EvalSubExprsCallback>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalSubExprsIfNeededAsync(
+      EvaluatorPointerType dest, EvalSubExprsCallback done) {
+    m_leftImpl.evalSubExprsIfNeededAsync(nullptr, [this, done, dest](bool) {
+      m_rightImpl.evalSubExprsIfNeededAsync(nullptr, [this, done, dest](bool) {
+        if (dest) {
+          evalToAsync(dest, [done]() { done(false); });
+        } else {
+          m_result = static_cast<EvaluatorPointerType>(
+              m_device.allocate(dimensions().TotalSize() * sizeof(Scalar)));
+          evalToAsync(m_result, [done]() { done(true); });
+        }
+      });
+    });
+  }
+#endif  // EIGEN_USE_THREADS
+
+#define TENSOR_CONTRACTION_DISPATCH(METHOD, ALIGNMENT, ARGS) \
+  if (this->m_lhs_inner_dim_contiguous) {                    \
+    if (this->m_rhs_inner_dim_contiguous) {                  \
+      if (this->m_rhs_inner_dim_reordered) {                 \
+        METHOD<true, true, true, ALIGNMENT> ARGS;            \
+      } else {                                               \
+        METHOD<true, true, false, ALIGNMENT> ARGS;           \
+      }                                                      \
+    } else {                                                 \
+      if (this->m_rhs_inner_dim_reordered) {                 \
+        METHOD<true, false, true, ALIGNMENT> ARGS;           \
+      } else {                                               \
+        METHOD<true, false, false, ALIGNMENT> ARGS;          \
+      }                                                      \
+    }                                                        \
+  } else {                                                   \
+    if (this->m_rhs_inner_dim_contiguous) {                  \
+      if (this->m_rhs_inner_dim_reordered) {                 \
+        METHOD<false, true, true, ALIGNMENT> ARGS;           \
+      } else {                                               \
+        METHOD<false, true, false, ALIGNMENT> ARGS;          \
+      }                                                      \
+    } else {                                                 \
+      if (this->m_rhs_inner_dim_reordered) {                 \
+        METHOD<false, false, true, ALIGNMENT> ARGS;          \
+      } else {                                               \
+        METHOD<false, false, false, ALIGNMENT> ARGS;         \
+      }                                                      \
+    }                                                        \
+  }
+
+#define TENSOR_CONTRACTION_ASYNC_DISPATCH(METHOD, DONE, ALIGNMENT, ARGS, FN) \
+  if (this->m_lhs_inner_dim_contiguous) {                                    \
+    if (this->m_rhs_inner_dim_contiguous) {                                  \
+      if (this->m_rhs_inner_dim_reordered) {                                 \
+        (new METHOD<DONE, true, true, true, ALIGNMENT> ARGS)->FN;            \
+      } else {                                                               \
+        (new METHOD<DONE, true, true, false, ALIGNMENT> ARGS)->FN;           \
+      }                                                                      \
+    } else {                                                                 \
+      if (this->m_rhs_inner_dim_reordered) {                                 \
+        (new METHOD<DONE, true, false, true, ALIGNMENT> ARGS)->FN;           \
+      } else {                                                               \
+        (new METHOD<DONE, true, false, false, ALIGNMENT> ARGS)->FN;          \
+      }                                                                      \
+    }                                                                        \
+  } else {                                                                   \
+    if (this->m_rhs_inner_dim_contiguous) {                                  \
+      if (this->m_rhs_inner_dim_reordered) {                                 \
+        (new METHOD<DONE, false, true, true, ALIGNMENT> ARGS)->FN;           \
+      } else {                                                               \
+        (new METHOD<DONE, false, true, false, ALIGNMENT> ARGS)->FN;          \
+      }                                                                      \
+    } else {                                                                 \
+      if (this->m_rhs_inner_dim_reordered) {                                 \
+        (new METHOD<DONE, false, false, true, ALIGNMENT> ARGS)->FN;          \
+      } else {                                                               \
+        (new METHOD<DONE, false, false, false, ALIGNMENT> ARGS)->FN;         \
+      }                                                                      \
+    }                                                                        \
+  }
 
   EIGEN_DEVICE_FUNC void evalTo(Scalar* buffer) const {
    static_cast<const Derived*>(this)->template evalProduct<Unaligned>(buffer);
   }
 
+#ifdef EIGEN_USE_THREADS
+  template <typename EvalToCallback>
+  void evalToAsync(Scalar* buffer, EvalToCallback done) const {
+    static_cast<const Derived*>(this)
+        ->template evalProductAsync<EvalToCallback, Unaligned>(buffer,
+                                                               std::move(done));
+  }
+#endif  // EIGEN_USE_THREADS
+
   template <bool lhs_inner_dim_contiguous, bool rhs_inner_dim_contiguous,
             bool rhs_inner_dim_reordered, int Alignment>
   void evalProductSequential(Scalar* buffer) const {
-- 
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