From 8fbd47052bcafea612b8ae2841c1de5db738f042 Mon Sep 17 00:00:00 2001
From: Deven Desai <deven.desai.amd@gmail.com>
Date: Wed, 6 Jun 2018 10:12:58 -0400
Subject: Adding support for using Eigen in HIP kernels.

This commit enables the use of Eigen on HIP kernels / AMD GPUs. Support has been added along the same lines as what already exists for using Eigen in CUDA kernels / NVidia GPUs.

Application code needs to explicitly define EIGEN_USE_HIP when using Eigen in HIP kernels. This is because some of the CUDA headers get picked up by default during Eigen compile (irrespective of whether or not the underlying compiler is CUDACC/NVCC, for e.g. Eigen/src/Core/arch/CUDA/Half.h). In order to maintain this behavior, the EIGEN_USE_HIP macro is used to switch to using the HIP version of those header files (see Eigen/Core and unsupported/Eigen/CXX11/Tensor)


Use the "-DEIGEN_TEST_HIP" cmake option to enable the HIP specific unit tests.
---
 .../Eigen/CXX11/src/Tensor/TensorReduction.h       | 24 ++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

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

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorReduction.h b/unsupported/Eigen/CXX11/src/Tensor/TensorReduction.h
index da0ffe728..d2fb3fd32 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorReduction.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorReduction.h
@@ -334,12 +334,12 @@ struct OuterReducer {
 };
 
 
-#if defined(EIGEN_USE_GPU) && defined(EIGEN_CUDACC)
+#if defined(EIGEN_USE_GPU) && (defined(EIGEN_CUDACC) || defined(EIGEN_HIPCC))
 template <int B, int N, typename S, typename R, typename I>
 __global__ void FullReductionKernel(R, const S, I, typename S::CoeffReturnType*, unsigned int*);
 
 
-#ifdef EIGEN_HAS_CUDA_FP16
+#if defined(EIGEN_HAS_CUDA_FP16) || defined(EIGEN_HAS_HIP_FP16)
 template <typename S, typename R, typename I>
 __global__ void ReductionInitFullReduxKernelHalfFloat(R, const S, I, half2*);
 template <int B, int N, typename S, typename R, typename I>
@@ -495,7 +495,11 @@ struct TensorEvaluator<const TensorReductionOp<Op, Dims, ArgType, MakePointer_>,
 
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Dimensions& dimensions() const { return m_dimensions; }
 
-  EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC bool evalSubExprsIfNeeded(typename MakePointer_<CoeffReturnType>::Type data) {
+  EIGEN_STRONG_INLINE
+    #if !defined(EIGEN_HIPCC)
+    EIGEN_DEVICE_FUNC
+    #endif
+    bool evalSubExprsIfNeeded(typename MakePointer_<CoeffReturnType>::Type data) {
     m_impl.evalSubExprsIfNeeded(NULL);
 
     // Use the FullReducer if possible.
@@ -694,9 +698,9 @@ struct TensorEvaluator<const TensorReductionOp<Op, Dims, ArgType, MakePointer_>,
 #ifdef EIGEN_USE_THREADS
   template <typename S, typename O, bool V> friend struct internal::FullReducerShard;
 #endif
-#if defined(EIGEN_USE_GPU) && defined(EIGEN_CUDACC)
+#if defined(EIGEN_USE_GPU) && (defined(EIGEN_CUDACC) || defined(EIGEN_HIPCC))
   template <int B, int N, typename S, typename R, typename I> KERNEL_FRIEND void internal::FullReductionKernel(R, const S, I, typename S::CoeffReturnType*, unsigned int*);
-#ifdef EIGEN_HAS_CUDA_FP16
+#if defined(EIGEN_HAS_CUDA_FP16) || defined(EIGEN_HAS_HIP_FP16)
   template <typename S, typename R, typename I> KERNEL_FRIEND void internal::ReductionInitFullReduxKernelHalfFloat(R, const S, I, half2*);
   template <int B, int N, typename S, typename R, typename I> KERNEL_FRIEND void internal::FullReductionKernelHalfFloat(R, const S, I, half*, half2*);
   template <int NPT, typename S, typename R, typename I> KERNEL_FRIEND void internal::InnerReductionKernelHalfFloat(R, const S, I, I, half*);
@@ -774,14 +778,22 @@ struct TensorEvaluator<const TensorReductionOp<Op, Dims, ArgType, MakePointer_>,
   // Indexed by reduced dimensions.
   array<Index, NumReducedDims> m_reducedDims;
 
+#if defined(EIGEN_HIPCC)
+ public:
+#endif
+  
   // Evaluator for the input expression.
   TensorEvaluator<ArgType, Device> m_impl;
 
+#if defined(EIGEN_HIPCC)
+ private:
+#endif
+  
   // Operation to apply for computing the reduction.
   Op m_reducer;
 
   // For full reductions
-#if defined(EIGEN_USE_GPU) && defined(EIGEN_CUDACC)
+#if defined(EIGEN_USE_GPU) && (defined(EIGEN_CUDACC) || defined(EIGEN_HIPCC))
   static const bool RunningOnGPU = internal::is_same<Device, Eigen::GpuDevice>::value;
   static const bool RunningOnSycl = false;
 #elif defined(EIGEN_USE_SYCL)
-- 
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