UnsignedLoads.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 *
 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:+EliminateAutoBox
 *                   -XX:CompileOnly=::valueOf,::byteValue,::shortValue,::testUnsignedByte,::testUnsignedShort
 *                   compiler.eliminateAutobox.UnsignedLoads
 */

package compiler.eliminateAutobox;

import static jdk.test.lib.Asserts.assertEQ;

public class UnsignedLoads {
    public static int testUnsignedByte() {
        byte[] bytes = new byte[] {-1};
        int res = 0;
        for (int i = 0; i < 100000; i++) {
            for (Byte b : bytes) {
                res = b & 0xff;
            }
        }
        return res;
    }

    public static int testUnsignedShort() {
        int res = 0;
        short[] shorts = new short[] {-1};
        for (int i = 0; i < 100000; i++) {
            for (Short s : shorts) {
                res = s & 0xffff;
            }
        }
        return res;
    }

    public static void main(String[] args) {
        assertEQ(testUnsignedByte(),    255);
        assertEQ(testUnsignedShort(), 65535);
        System.out.println("TEST PASSED");
    }
}