1 /*
   2  * Copyright (c) 2014, 2015, 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  * @test
  26  * @bug 8063086
  27  * @summary X^2 special case for C2 yields different result than interpreter
  28  * @library /testlibrary /test/lib /
  29  * @modules java.base/jdk.internal.misc
  30  *          java.management
  31  *
  32  * @build compiler.floatingpoint.TestPow2
  33  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  34  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  35  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  36  *                   -XX:-BackgroundCompilation -XX:-UseOnStackReplacement
  37  *                   compiler.floatingpoint.TestPow2
  38  */
  39 
  40 package compiler.floatingpoint;
  41 
  42 import compiler.whitebox.CompilerWhiteBoxTest;
  43 import sun.hotspot.WhiteBox;
  44 
  45 import java.lang.reflect.Method;
  46 
  47 public class TestPow2 {
  48 
  49     private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
  50 
  51     private static final double base = 5350.456329377186;
  52     private static final double exp = 2.0;
  53 
  54     static double m() {
  55         return Math.pow(base, exp);
  56     }
  57 
  58     static public void main(String[] args) throws NoSuchMethodException {
  59         Method test_method = TestPow2.class.getDeclaredMethod("m");
  60 
  61         double interpreter_result = m();
  62 
  63         // Compile with C1 if possible
  64         WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE);
  65 
  66         double c1_result = m();
  67 
  68         WHITE_BOX.deoptimizeMethod(test_method);
  69 
  70         // Compile it with C2 if possible
  71         WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
  72 
  73         double c2_result = m();
  74 
  75         if (interpreter_result != c1_result || interpreter_result != c2_result ||
  76             c1_result != c2_result) {
  77             System.out.println("interpreter = " + interpreter_result + " c1 = " + c1_result + " c2 = " + c2_result);
  78             throw new RuntimeException("Test Failed");
  79         }
  80     }
  81 }