1 files changed, 39 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/common/hash_utils.h b/gfx/angle/checkout/src/common/hash_utils.h
new file mode 100644
index 0000000000..aec4e7f77c
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+++ b/gfx/angle/checkout/src/common/hash_utils.h
@@ -0,0 +1,39 @@
+//
+// Copyright 2018 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// hash_utils.h: Hashing based helper functions.
+
+#ifndef COMMON_HASHUTILS_H_
+#define COMMON_HASHUTILS_H_
+
+#include "common/debug.h"
+#include "common/third_party/xxhash/xxhash.h"
+
+namespace angle
+{
+// Computes a hash of "key". Any data passed to this function must be multiples of
+// 4 bytes, since the PMurHash32 method can only operate increments of 4-byte words.
+inline std::size_t ComputeGenericHash(const void *key, size_t keySize)
+{
+    static constexpr unsigned int kSeed = 0xABCDEF98;
+
+    // We can't support "odd" alignments.  ComputeGenericHash requires aligned types
+    ASSERT(keySize % 4 == 0);
+#if defined(ANGLE_IS_64_BIT_CPU)
+    return XXH64(key, keySize, kSeed);
+#else
+    return XXH32(key, keySize, kSeed);
+#endif  // defined(ANGLE_IS_64_BIT_CPU)
+}
+
+template <typename T>
+std::size_t ComputeGenericHash(const T &key)
+{
+    static_assert(sizeof(key) % 4 == 0, "ComputeGenericHash requires aligned types");
+    return ComputeGenericHash(&key, sizeof(key));
+}
+}  // namespace angle
+
+#endif  // COMMON_HASHUTILS_H_