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+/* Copyright 2019 Google LLC. 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.
+==============================================================================*/
+
+// Miscellaneous helpers internal library.
+
+#ifndef TENSORFLOW_LITE_EXPERIMENTAL_RUY_RUY_COMMON_H_
+#define TENSORFLOW_LITE_EXPERIMENTAL_RUY_RUY_COMMON_H_
+
+#include <limits>
+#include <type_traits>
+
+#include "ruy/check_macros.h"
+#include "ruy/matrix.h"
+#include "ruy/opt_set.h"
+#include "ruy/path.h"
+#include "ruy/platform.h"
+
+#if RUY_OPT_ENABLED(RUY_OPT_PREFETCH_LOAD)
+#define RUY_PREFETCH_LOAD(X) X
+#else
+#define RUY_PREFETCH_LOAD(X)
+#endif
+
+#if RUY_OPT_ENABLED(RUY_OPT_PREFETCH_STORE)
+#define RUY_PREFETCH_STORE(X) X
+#else
+#define RUY_PREFETCH_STORE(X)
+#endif
+
+#define RUY_STR(s) RUY_STR_UNEXPANDED(s)
+#define RUY_STR_UNEXPANDED(s) #s
+
+namespace ruy {
+
+// Helper for type-erasing a pointer.
+//
+// Often inside Ruy, a template parameter holds type information statically, but
+// we would like to have a function signature that doesn't depend on the
+// template parameters, so that we can dispatch indirectly across multiple
+// implementations. This helper is at the core of such type-erasure.
+//
+// The opposite of this operation is just `static_cast<T*>(void_ptr)`.
+template <typename T>
+void* ToVoidPtr(T* p) {
+  return const_cast<void*>(static_cast<const void*>(p));
+}
+
+template <typename Scalar>
+Scalar SymmetricZeroPoint() {
+  if (std::is_floating_point<Scalar>::value) {
+    return 0;
+  }
+  if (std::is_signed<Scalar>::value) {
+    return 0;
+  }
+  return std::numeric_limits<Scalar>::max() / 2 + 1;
+}
+
+}  // namespace ruy
+
+#endif  // TENSORFLOW_LITE_EXPERIMENTAL_RUY_RUY_COMMON_H_