1 files changed, 52 insertions, 0 deletions
diff --git a/tensorflow/compiler/xla/service/gpu/temp_buffer_offsets.cc b/tensorflow/compiler/xla/service/gpu/temp_buffer_offsets.cc
new file mode 100644
index 0000000000..3cf5dd021a
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+++ b/tensorflow/compiler/xla/service/gpu/temp_buffer_offsets.cc
@@ -0,0 +1,52 @@
+/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "tensorflow/compiler/xla/service/gpu/temp_buffer_offsets.h"
+
+#include "tensorflow/compiler/xla/map_util.h"
+
+namespace xla {
+namespace gpu {
+
+namespace {
+int64 RoundUpToAlignment(int64 value) {
+  // Any address of a variable residing in global memory or returned by one of
+  // the memory allocation routines from the driver or runtime API is always
+  // aligned to at least 256 bytes.
+  // (http://docs.nvidia.com/cuda/cuda-c-programming-guide/#device-memory-accesses)
+  static constexpr int64 kCudaMallocAlignment = 256;
+  return (value + kCudaMallocAlignment - 1) / kCudaMallocAlignment *
+         kCudaMallocAlignment;
+}
+}  // namespace
+
+TempBufferOffsets::TempBufferOffsets(
+    const BufferAssignment& buffer_assignment) {
+  total_size_of_temp_buffers_ = 0;
+  for (auto i = 0; i < buffer_assignment.Allocations().size(); ++i) {
+    const BufferAllocation& allocation = buffer_assignment.GetAllocation(i);
+    if (allocation.IsPreallocatedTempBuffer()) {
+      InsertOrDie(&buffer_index_to_offset_, i, total_size_of_temp_buffers_);
+      total_size_of_temp_buffers_ += RoundUpToAlignment(allocation.size());
+    }
+  }
+}
+
+int64 TempBufferOffsets::GetOffset(BufferAllocation::Index index) const {
+  return FindOrDie(buffer_index_to_offset_, index);
+}
+
+}  // namespace gpu
+}  // namespace xla