diff --git a/compiler/optimizing/instruction_simplifier_x86_shared.h b/compiler/optimizing/instruction_simplifier_x86_shared.h
new file mode 100644
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+++ b/compiler/optimizing/instruction_simplifier_x86_shared.h
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+/* Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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 ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_X86_SHARED_H_
+#define ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_X86_SHARED_H_
+
+#include "nodes.h"
+
+namespace art {
+bool TryCombineAndNot(HAnd* instruction);
+bool TryGenerateResetLeastSetBit(HAnd* instruction);
+bool TryGenerateMaskUptoLeastSetBit(HXor* instruction);
+bool AreLeastSetBitInputs(HInstruction* to_test, HInstruction* other);
+}  // namespace art
+
+#endif  // ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_X86_SHARED_H_
+