1 /*
   2  * Copyright (c) 2014, 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 package org.graalvm.compiler.core.test;
  24 
  25 import org.junit.Assert;
  26 import org.junit.Test;
  27 
  28 /**
  29  * Check for incorrect elimination of 0.0 and -0.0 from computations. They can affect the sign of
  30  * the result of an add or substract.
  31  */
  32 public class FloatOptimizationTest extends GraalCompilerTest {
  33 
  34     @Test
  35     public void test1() {
  36         test("test1Snippet", -0.0);
  37     }
  38 
  39     @SuppressWarnings("all")
  40     public static double test1Snippet(double x) {
  41         return x + 0.0;
  42     }
  43 
  44     @Test
  45     public void test2() {
  46         test("test2Snippet", -0.0f);
  47     }
  48 
  49     @SuppressWarnings("all")
  50     public static double test2Snippet(float x) {
  51         return x + 0.0f;
  52     }
  53 
  54     @Test
  55     public void test3() {
  56         test("test3Snippet", -0.0);
  57     }
  58 
  59     @SuppressWarnings("all")
  60     public static double test3Snippet(double x) {
  61         return x - -0.0;
  62     }
  63 
  64     @Test
  65     public void test4() {
  66         test("test4Snippet", -0.0f);
  67     }
  68 
  69     @SuppressWarnings("all")
  70     public static double test4Snippet(float x) {
  71         return x - -0.0f;
  72     }
  73 
  74     @Override
  75     protected void assertDeepEquals(String message, Object expected, Object actual, double delta) {
  76         if (expected instanceof Double && actual instanceof Double) {
  77             double e = (double) expected;
  78             double a = (double) actual;
  79             if (Double.doubleToRawLongBits(a) != Double.doubleToRawLongBits(e)) {
  80                 Assert.fail((message == null ? "" : message) + "raw double bits not equal " + Double.doubleToRawLongBits(a) + " != " + Double.doubleToRawLongBits(e));
  81             }
  82         } else {
  83             super.assertDeepEquals(message, expected, actual, delta);
  84         }
  85     }
  86 }