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diff --git a/js/src/vm/EqualityOperations.h b/js/src/vm/EqualityOperations.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * The equality comparisons of js/Equality.h, but with extra efficiency for
+ * SpiderMonkey-internal callers.
+ *
+ * These functions, assuming they're passed C++-valid arguments, are identical
+ * to the same-named JS::-namespaced functions -- just with hidden linkage (so
+ * they're more efficient to call), and without various external-caller-focused
+ * JSAPI-usage assertions performed that SpiderMonkey users never come close to
+ * failing.
+ */
+
+#ifndef vm_EqualityOperations_h
+#define vm_EqualityOperations_h
+
+#include "jstypes.h"        // JS_PUBLIC_API
+#include "js/RootingAPI.h"  // JS::Handle
+#include "js/Value.h"       // JS::Value
+
+struct JS_PUBLIC_API JSContext;
+
+namespace js {
+
+/** Computes |lval === rval|. */
+extern bool StrictlyEqual(JSContext* cx, JS::Handle<JS::Value> lval,
+                          JS::Handle<JS::Value> rval, bool* equal);
+
+/** Computes |lval == rval|. */
+extern bool LooselyEqual(JSContext* cx, JS::Handle<JS::Value> lval,
+                         JS::Handle<JS::Value> rval, bool* equal);
+
+/**
+ * Computes |SameValue(v1, v2)| -- strict equality except that NaNs are
+ * considered equal and opposite-signed zeroes are considered unequal.
+ */
+extern bool SameValue(JSContext* cx, JS::Handle<JS::Value> v1,
+                      JS::Handle<JS::Value> v2, bool* same);
+
+#ifdef ENABLE_RECORD_TUPLE
+/**
+ * Computes |SameValue(v1, v2)|, but it expects that strings, records and
+ * tuples are all linear.
+ */
+extern bool SameValueZeroLinear(const JS::Value& lval, const JS::Value& rval);
+#endif
+
+/**
+ * Computes |SameValueZero(v1, v2)| -- strict equality except that NaNs are
+ * considered equal. Opposite-signed zeroes are considered equal.
+ */
+extern bool SameValueZero(JSContext* cx, JS::Handle<JS::Value> v1,
+                          JS::Handle<JS::Value> v2, bool* same);
+
+/*
+ * Whether strict equality of a JS::Value (with any other JS::Value) can be
+ * implemented by comparing the raw bits, Value::asRawBits().
+ *
+ * Note that this does not include Int32Value, because DoubleValue can store
+ * integers too.
+ */
+inline bool CanUseBitwiseCompareForStrictlyEqual(const JS::Value& v) {
+  return v.isObject() || v.isSymbol() || v.isNullOrUndefined() || v.isBoolean();
+}
+
+}  // namespace js
+
+#endif  // vm_EqualityOperations_h