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annotate test/compiler/floatingpoint/TestPow2.java @ 23940:f958bebdee26 jdk8u92-b32

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8063086: Math.pow yields different results upon repeated calls Summary: C2 treats x^2 as a special case and computes x * x while the interpreter and c1 don't have special case code for X^2. Reviewed-by: kvn
author csahu
date Tue, 24 May 2016 17:49:06 +0530
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23940
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 8063086
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27 * @summary X^2 special case for C2 yields different result than interpreter
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28 * @library /testlibrary /testlibrary/whitebox /compiler/whitebox
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29 * @build TestPow2
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30 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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31 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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32 * -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestPow2
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33 *
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34 */
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35
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36 import java.lang.reflect.*;
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37 import sun.hotspot.WhiteBox;
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38
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39 public class TestPow2 {
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40
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41 private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
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42
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43 private static final double base = 5350.456329377186;
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44 private static final double exp = 2.0;
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45
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46 static double m() {
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47 return Math.pow(base, exp);
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48 }
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49
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50 static public void main(String[] args) throws NoSuchMethodException {
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51 Method test_method = TestPow2.class.getDeclaredMethod("m");
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52
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53 double interpreter_result = m();
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54
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55 // Compile with C1 if possible
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56 WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE);
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57
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58 double c1_result = m();
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59
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60 WHITE_BOX.deoptimizeMethod(test_method);
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61
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62 // Compile it with C2 if possible
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63 WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);
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64
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65 double c2_result = m();
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66
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67 if (interpreter_result != c1_result || interpreter_result != c2_result ||
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68 c1_result != c2_result) {
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69 System.out.println("interpreter = " + interpreter_result + " c1 = " + c1_result + " c2 = " + c2_result);
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70 throw new RuntimeException("Test Failed");
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71 }
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72 }
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73 }