test/compiler/6443505/Test6443505.java

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/**
 * @test
 * @bug 6443505
 * @summary Some cases for CmpLTMask missed; also wrong code.
 *
 * @run main/othervm -Xcomp -XX:CompileOnly="Test6443505.compiled" Test6443505
 */

public class Test6443505 {

    public static void main(String[] args) throws InterruptedException {
        test(Integer.MIN_VALUE, 0);
        test(0, Integer.MIN_VALUE);
        test(Integer.MIN_VALUE, -1);
        test(-1, Integer.MIN_VALUE);
        test(Integer.MIN_VALUE, 1);
        test(1, Integer.MIN_VALUE);

        test(Integer.MAX_VALUE, 0);
        test(0, Integer.MAX_VALUE);
        test(Integer.MAX_VALUE, -1);
        test(-1, Integer.MAX_VALUE);
        test(Integer.MAX_VALUE, 1);
        test(1, Integer.MAX_VALUE);

        test(Integer.MIN_VALUE, Integer.MAX_VALUE);
        test(Integer.MAX_VALUE, Integer.MIN_VALUE);

        test(1, -1);
        test(1, 0);
        test(1, 1);
        test(-1, -1);
        test(-1, 0);
        test(-1, 1);
        test(0, -1);
        test(0, 0);
        test(0, 1);
    }

    public static void test(int a, int b) throws InterruptedException {
        int C = compiled(4, a, b);
        int I = interpreted(4, a, b);
        if (C != I) {
            System.err.println("#1 C = " + C + ", I = " + I);
            System.err.println("#1 C != I, FAIL");
            System.exit(97);
        }

        C = compiled(a, b, q, 4);
        I = interpreted(a, b, q, 4);
        if (C != I) {
            System.err.println("#2 C = " + C + ", I = " + I);
            System.err.println("#2 C != I, FAIL");
            System.exit(97);
        }

    }

    static int q = 4;

    // If improperly compiled, uses carry/borrow bit, which is wrong.
    // with -XX:+PrintOptoAssembly, look for cadd_cmpLTMask
    static int compiled(int p, int x, int y) {
        return (x < y) ? q + (x - y) : (x - y);
    }

    // interpreted reference
    static int interpreted(int p, int x, int y) {
        return (x < y) ? q + (x - y) : (x - y);
    }

    // Test new code with a range of cases
    // with -XX:+PrintOptoAssembly, look for and_cmpLTMask
    static int compiled(int x, int y, int q, int p) {
        return (x < y) ? p + q : q;
    }

    // interpreted reference
    static int interpreted(int x, int y, int q, int p) {
        return (x < y) ? p + q : q;
    }

}