1 /*

     2  * Copyright (c) 2019, SAP SE. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug 8220374

    27  * @summary C2: LoopStripMining doesn't strip as expected

    28  * @requires vm.compiler2.enabled

    29  *

    30  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+SafepointTimeout -XX:+SafepointALot

    31  *                   -XX:+AbortVMOnSafepointTimeout -XX:SafepointTimeoutDelay=500 -XX:GuaranteedSafepointInterval=500

    32  *                   -XX:-TieredCompilation -XX:+UseCountedLoopSafepoints -XX:LoopStripMiningIter=1000

    33  *                   -XX:LoopUnrollLimit=0 -XX:CompileCommand=compileonly,CheckLoopStripMining::test_loop -Xcomp CheckLoopStripMining

    34  *

    35  */

    36 

    37 public class CheckLoopStripMining {

    38 

    39   public static int test_loop(int x) {

    40       int sum = 0;

    41       if (x != 0) {

    42           for (int y = 1; y < Integer.MAX_VALUE; ++y) {

    43               if (y % x == 0) ++sum;

    44           }

    45       }

    46       return sum;

    47   }

    48 

    49   public static void main(String args[]) {

    50     int sum = test_loop(3);

    51     System.out.println("sum: " + sum);

    52   }

    53 }