1 /* Copyright 2015 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 16 #ifndef TENSORFLOW_CORE_UTIL_CUDA_KERNEL_HELPER_H_ 17 #define TENSORFLOW_CORE_UTIL_CUDA_KERNEL_HELPER_H_ 18 19 #if GOOGLE_CUDA 20 21 #include "tensorflow/core/util/cuda_device_functions.h" 22 #include "tensorflow/core/util/cuda_launch_config.h" 23 24 #include "cuda/include/cuda_fp16.h" 25 26 // Deprecated, use 'for(int i : CudaGridRangeX(n))' instead. 27 #define CUDA_1D_KERNEL_LOOP(i, n) \ 28 for (int i : ::tensorflow::CudaGridRangeX<int>(n)) 29 // Deprecated, use 'for(int i : CudaGridRange?(n))' instead. 30 #define CUDA_AXIS_KERNEL_LOOP(i, n, axis) \ 31 for (int i : ::tensorflow::CudaGridRange##axis<int>(n)) 32 33 namespace tensorflow { 34 __host__ __device__ inline tensorflow::bfloat16 CudaLdg( 35 const tensorflow::bfloat16* address) { 36 tensorflow::bfloat16 return_value; 37 return_value.value = CudaLdg(reinterpret_cast<const uint16_t*>(address)); 38 return return_value; 39 } 40 41 template <typename T> 42 __host__ __device__ inline T ldg(const T* ptr) { 43 return CudaLdg(ptr); 44 } 45 46 template <typename T> 47 __host__ __device__ inline const T& tf_min(const T& x, const T& y) { 48 return x < y ? x : y; 49 } 50 51 template <typename T> 52 __host__ __device__ inline const T& tf_max(const T& x, const T& y) { 53 return x < y ? y : x; 54 } 55 56 // Overloads of the above functions for float and double. 57 __host__ __device__ inline float tf_min(float x, float y) { 58 return fminf(x, y); 59 } 60 __host__ __device__ inline double tf_min(double x, double y) { 61 return fmin(x, y); 62 } 63 __host__ __device__ inline float tf_max(float x, float y) { 64 return fmaxf(x, y); 65 } 66 __host__ __device__ inline double tf_max(double x, double y) { 67 return fmax(x, y); 68 } 69 70 __device__ inline Eigen::half CudaShuffleSync(unsigned mask, Eigen::half value, 71 int src_lane, 72 int width = warpSize) { 73 return Eigen::half( 74 CudaShuffleSync(mask, static_cast<uint16>(value), src_lane, width)); 75 } 76 77 __device__ EIGEN_ALWAYS_INLINE Eigen::half CudaShuffleUpSync( 78 unsigned mask, Eigen::half value, int delta, int width = warpSize) { 79 return Eigen::half( 80 CudaShuffleUpSync(mask, static_cast<uint16>(value), delta, width)); 81 } 82 83 __device__ EIGEN_ALWAYS_INLINE Eigen::half CudaShuffleDownSync( 84 unsigned mask, Eigen::half value, int delta, int width = warpSize) { 85 return Eigen::half( 86 CudaShuffleDownSync(mask, static_cast<uint16>(value), delta, width)); 87 } 88 89 __device__ EIGEN_ALWAYS_INLINE Eigen::half CudaShuffleXorSync( 90 unsigned mask, Eigen::half value, int lane_mask, int width = warpSize) { 91 return Eigen::half( 92 CudaShuffleXorSync(mask, static_cast<uint16>(value), lane_mask, width)); 93 } 94 95 namespace cuda_helper { 96 template <typename T, typename OutType = int32> 97 __device__ OutType upper_bound(const T* first, OutType count, T val) { 98 const T* orig = first; 99 const T* it = nullptr; 100 OutType step = 0; 101 while (count > 0) { 102 it = first; 103 step = count / 2; 104 it += step; 105 if (!(val < *it)) { 106 first = ++it; 107 count -= step + 1; 108 } else { 109 count = step; 110 } 111 } 112 113 return first - orig; 114 } 115 116 template <typename T, typename OutType = int32> 117 __device__ OutType lower_bound(const T* first, OutType count, T val) { 118 const T* orig = first; 119 const T* it = nullptr; 120 OutType step = 0; 121 while (count > 0) { 122 it = first; 123 step = count / 2; 124 it += step; 125 if (*it < val) { 126 first = ++it; 127 count -= step + 1; 128 } else { 129 count = step; 130 } 131 } 132 133 return first - orig; 134 } 135 136 } // namespace cuda_helper 137 } // namespace tensorflow 138 139 #endif // GOOGLE_CUDA 140 #endif // TENSORFLOW_CORE_UTIL_CUDA_KERNEL_HELPER_H_ 141
