test/hotspot/jtreg/compiler/c2/MinValueStrideCountedLoop.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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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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 */
package compiler.c2;

/*
 * @test
 * @bug 8314191
 * @summary Loop increment should not be transformed into unsigned comparison
 *
 * @run main/othervm -Xcomp -XX:-TieredCompilation
 *                   -XX:CompileCommand=compileonly,*MinValueStrideCountedLoop::test*
 *                   compiler.c2.MinValueStrideCountedLoop
 */

/*
 * @test
 * @bug 8316719
 * @summary Loop increment should not be transformed into unsigned comparison
 * @requires vm.compiler2.enabled
 * @run main/othervm -Xcomp -XX:-TieredCompilation -XX:-UseLoopPredicate
 *                   -XX:CompileCommand=compileonly,*MinValueStrideCountedLoop::test*
 *                   compiler.c2.MinValueStrideCountedLoop
 */
public class MinValueStrideCountedLoop {
    static int limit = 0;
    static int res = 0;
    static int[] array = new int[1];
    static boolean b;

    static void test1() {
        for (int i = 0; i >= limit + -2147483647; i += -2147483648) {
            res += 42;
        }
    }

    static int test2(int init, int limit) {
        int res = 0;
        int i = init;
        do {
            if (b) { }
            res += array[i];
            i += -2147483648;
        } while (i >= limit + -2147483647);
        return res;
    }

    public static void main(String[] args) {
        test1();
        test2(0, 0);
    }
}