test/hotspot/jtreg/compiler/loopstripmining/CheckLoopStripMining.java

/*
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 * 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
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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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 * 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 8220374
 * @summary C2: LoopStripMining doesn't strip as expected
 * @requires vm.compiler2.enabled
 *
 * @library /test/lib
 * @run driver compiler.loopstripmining.CheckLoopStripMining
 */

package compiler.loopstripmining;

import jdk.test.lib.Utils;
import jdk.test.lib.process.ProcessTools;

public class CheckLoopStripMining {
  public static void main(String args[]) throws Exception {
    ProcessTools.executeTestJvm(
        "-XX:+UnlockDiagnosticVMOptions",
        // to prevent biased locking handshakes from changing the timing of this test
        "-XX:-UseBiasedLocking",
        "-XX:+SafepointTimeout",
        "-XX:+SafepointALot",
        "-XX:+AbortVMOnSafepointTimeout",
        "-XX:SafepointTimeoutDelay=" + Utils.adjustTimeout(500),
        "-XX:GuaranteedSafepointInterval=" + Utils.adjustTimeout(500),
        "-XX:-TieredCompilation",
        "-XX:+UseCountedLoopSafepoints",
        "-XX:LoopStripMiningIter=1000",
        "-XX:LoopUnrollLimit=0",
        "-XX:CompileCommand=compileonly,compiler.loopstripmining.CheckLoopStripMining$Test::test_loop",
        "-Xcomp",
        Test.class.getName()).shouldHaveExitValue(0)
                             .stdoutShouldContain("sum: 715827882");
  }

  public static class Test {
    public static int test_loop(int x) {
      int sum = 0;
      if (x != 0) {
          for (int y = 1; y < Integer.MAX_VALUE; ++y) {
              if (y % x == 0) ++sum;
          }
      }
      return sum;
    }

    public static void main(String args[]) {
      int sum = test_loop(3);
      System.out.println("sum: " + sum);
    }
  }
}