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diff --git a/src/ir/function-utils.h b/src/ir/function-utils.h
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+/*
+ * Copyright 2018 WebAssembly Community Group participants
+ *
+ * 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 wasm_ir_function_h
+#define wasm_ir_function_h
+
+#include "wasm.h"
+#include "ir/utils.h"
+
+namespace wasm {
+
+namespace FunctionUtils {
+
+// Checks if two functions are equal in all functional aspects,
+// everything but their name (which can't be the same, in the same
+// module!) - same params, vars, body, result, etc.
+inline bool equal(Function* left, Function* right) {
+  if (left->getNumParams() != right->getNumParams()) return false;
+  if (left->getNumVars() != right->getNumVars()) return false;
+  for (Index i = 0; i < left->getNumLocals(); i++) {
+    if (left->getLocalType(i) != right->getLocalType(i)) return false;
+  }
+  if (left->result != right->result) return false;
+  if (left->type != right->type) return false;
+  return ExpressionAnalyzer::equal(left->body, right->body);
+}
+
+} // namespace FunctionUtils
+
+} // namespace wasm
+
+#endif // wasm_ir_function_h
+