test/2024-InvariantNegativeLoop/src/Main.java

/*
 * Copyright (C) 2019 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 assertFloatEquals(float expected, float result) {
        if (expected != result) {
            throw new Error("Expected: " + expected + ", found: " + result);
        }
    }

    public int loop() {
        float used1 = 1;
        float used2 = 2;
        float used3 = 3;
        float used4 = 4;
        float invar1 = 15;
        float invar2 = 25;
        float invar3 = 35;
        float invar4 = 45;
        float i = 0.5f;

        do {
            used1 = invar1 + invar2;
            used2 = invar2 - invar3;
            used3 = invar3 * invar4;
            used4 = invar1 * invar2 - invar3 + invar4;
            i += 0.5f;
        } while (i < 5000.25f);
        assertFloatEquals(Float.floatToIntBits(used1 + used2 + used3 + used4), 1157152768);
        return Float.floatToIntBits(used1 + used2 + used3 + used4);
    }

    public static void main(String[] args) {
        int res = new Main().loop();
    }
}