1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. 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 
  26 /**
  27  * @test
  28  * @bug 8148490
  29  * @summary Test correct saving and restoring of vector registers at safepoints.
  30  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xbatch -XX:-TieredCompilation -XX:CompileCommand=exclude,TestRegisterRestoring::main -XX:+SafepointALot TestRegisterRestoring
  31  */
  32 public class TestRegisterRestoring {
  33   public static void main(String args[]) throws Exception {
  34     // Initialize
  35     float[] array = new float[100];
  36     for (int i = 0; i < array.length; ++i) {
  37       array[i] = 0;
  38     }
  39     // Test
  40     for (int j = 0; j < 20_000; ++j) {
  41       increment(array);
  42       // Check result
  43       for (int i = 0; i < array.length; i++) {
  44         if (array[i] != 10_000) {
  45           throw new RuntimeException("Test failed: array[" + i + "] = " + array[i] + " but should be 10.000");
  46         }
  47         array[i] = 0;
  48       }
  49     }
  50   }
  51 
  52   static void increment(float[] array) {
  53     // Loop with safepoint
  54     for (long l = 0; l < 10_000; l++) {
  55       // Vectorized loop
  56       for (int i = 0; i < array.length; ++i) {
  57         array[i] += 1;
  58       }
  59     }
  60   }
  61 }
  62