test/compiler/EliminateAutoBox/UnsignedLoads.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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/*
 * @test
 * @library /testlibrary
 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:+EliminateAutoBox
 *                   -XX:CompileOnly=::valueOf,::byteValue,::shortValue,::testUnsignedByte,::testUnsignedShort
 *                   UnsignedLoads
 */
import static com.oracle.java.testlibrary.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");
    }
}