Internal Change.

PiperOrigin-RevId: 175307445

1 files changed, 54 insertions, 0 deletions

diff --git a/tensorflow/contrib/lite/kernels/gemm_support.h b/tensorflow/contrib/lite/kernels/gemm_support.h
new file mode 100644
index 0000000000..b531959ffb
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+++ b/tensorflow/contrib/lite/kernels/gemm_support.h
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+/* 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.
+==============================================================================*/
+#ifndef THIRD_PARTY_TENSORFLOW_CONTRIB_LITE_KERNELS_GEMM_SUPPORT_H_
+#define THIRD_PARTY_TENSORFLOW_CONTRIB_LITE_KERNELS_GEMM_SUPPORT_H_
+
+#include "public/gemmlowp.h"
+#include "tensorflow/contrib/lite/context.h"
+
+namespace tflite {
+namespace gemm_support {
+
+// Returns the GemmContext stored in 'context', allowing multiple ops to
+// share a single object, as long as they share a TfLiteContext. The caller
+// must ensure that this is called between IncrementUsageCounter() and
+// DecrementUsageCounter(). For example, in the implementation of an op:
+//   void* Init(TfLiteContext* context, const char*, size_t) {
+//     gemm_support::IncrementUsageCounter(context);
+//     return nullptr;
+//   }
+//   void Free(TfLiteContext* context, void*) {
+//     gemm_support::DecrementUsageCounter(context);
+//   }
+//   TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) {
+//     auto* gemm_context = gemm_support::GetFromContext(context);
+//   }
+gemmlowp::GemmContext* GetFromContext(TfLiteContext* context);
+
+// Let the framework know that the GemmContext stored in 'context' will be used
+// by an op. If necessary a new GemmContext is created and placed in 'context'.
+void IncrementUsageCounter(TfLiteContext* context);
+
+// Let the framework know that the op stopped using the GemmContext stored in
+// 'context'. If there are no more usages the GemmContext will be deleted.
+void DecrementUsageCounter(TfLiteContext* context);
+
+// Set the maximum number threads available for gemmlowp operations.
+void SetMaxNumThreads(TfLiteContext* context, int num_threads);
+
+}  // namespace gemm_support
+}  // namespace tflite
+
+#endif  // THIRD_PARTY_TENSORFLOW_CONTRIB_LITE_KERNELS_GEMM_SUPPORT_H_