test/646-checker-long-const-to-int/src/Main.java

/*
 * Copyright (C) 2017 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.
 */

public class Main {
    public static void main(String[] args) {
        System.out.println(test(0L));
    }

    public static long testField = 0;
    public static long longField0 = 0;
    public static long longField1 = 0;
    public static long longField2 = 0;
    public static long longField3 = 0;
    public static long longField4 = 0;
    public static long longField5 = 0;
    public static long longField6 = 0;
    public static long longField7 = 0;

    /// CHECK-START-ARM: int Main.test(long) register (after)
    /// CHECK: TypeConversion locations:[#-8690466096623102344]->{{.*}}
    public static int test(long other) {
        // To avoid constant folding TypeConversion(const), hide the constant in a field. Then, hide
        // it even more inside a Select that can only be reduced after LSE+InstructionSimplifier. We
        // don't run constant folding after that.
        testField = 0x8765432112345678L;
        long value = testField;
        if (value + 1 == 0x8765432112345679L) {
            value = testField;
        } else {
            value = other;
        }
        // Now, the `value` is in a register because of the store but we need
        // a constant location to trigger the bug, so load a bunch of other fields.
        long l0 = longField0;
        long l1 = longField1;
        long l2 = longField2;
        long l3 = longField3;
        long l4 = longField4;
        long l5 = longField5;
        long l6 = longField6;
        long l7 = longField7;
        if (l0 != 0 || l1 != 0 || l2 != 0 || l3 != 0 || l4 != 0 || l5 != 0 || l6 != 0 || l7 != 0) {
            throw new Error();
        }
        // Do the conversion from constant location.
        return (int) value;
    }
}