1 /*
   2  * Copyright (c) 2014, 2018, 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 package org.graalvm.compiler.core.test;
  26 
  27 import org.junit.Assert;
  28 import org.junit.Test;
  29 
  30 /**
  31  * Check for incorrect elimination of 0.0 and -0.0 from computations. They can affect the sign of
  32  * the result of an add or substract.
  33  */
  34 public class FloatOptimizationTest extends GraalCompilerTest {
  35 
  36     @Test
  37     public void test1() {
  38         test("test1Snippet", -0.0);
  39     }
  40 
  41     @SuppressWarnings("all")
  42     public static double test1Snippet(double x) {
  43         return x + 0.0;
  44     }
  45 
  46     @Test
  47     public void test2() {
  48         test("test2Snippet", -0.0f);
  49     }
  50 
  51     @SuppressWarnings("all")
  52     public static double test2Snippet(float x) {
  53         return x + 0.0f;
  54     }
  55 
  56     @Test
  57     public void test3() {
  58         test("test3Snippet", -0.0);
  59     }
  60 
  61     @SuppressWarnings("all")
  62     public static double test3Snippet(double x) {
  63         return x - -0.0;
  64     }
  65 
  66     @Test
  67     public void test4() {
  68         test("test4Snippet", -0.0f);
  69     }
  70 
  71     @SuppressWarnings("all")
  72     public static double test4Snippet(float x) {
  73         return x - -0.0f;
  74     }
  75 
  76     @Override
  77     protected void assertDeepEquals(String message, Object expected, Object actual, double delta) {
  78         if (expected instanceof Double && actual instanceof Double) {
  79             double e = (double) expected;
  80             double a = (double) actual;
  81             if (Double.doubleToRawLongBits(a) != Double.doubleToRawLongBits(e)) {
  82                 Assert.fail((message == null ? "" : message) + "raw double bits not equal " + Double.doubleToRawLongBits(a) + " != " + Double.doubleToRawLongBits(e));
  83             }
  84         } else {
  85             super.assertDeepEquals(message, expected, actual, delta);
  86         }
  87     }
  88 }