1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 // Note that $opt$ is a marker for the optimizing compiler to ensure
18 // it does compile the method.
19 public class Main {
20 
assertEquals(int expected, int result)21   public static void assertEquals(int expected, int result) {
22     if (expected != result) {
23       throw new Error("Expected: " + expected + ", found: " + result);
24     }
25   }
26 
assertEquals(long expected, long result)27   public static void assertEquals(long expected, long result) {
28     if (expected != result) {
29       throw new Error("Expected: " + expected + ", found: " + result);
30     }
31   }
32 
assertEquals(float expected, float result)33   public static void assertEquals(float expected, float result) {
34     if (expected != result) {
35       throw new Error("Expected: " + expected + ", found: " + result);
36     }
37   }
38 
assertEquals(String expected, float result)39   public static void assertEquals(String expected, float result) {
40     if (!expected.equals(new Float(result).toString())) {
41       throw new Error("Expected: " + expected + ", found: " + result);
42     }
43   }
44 
assertEquals(double expected, double result)45   public static void assertEquals(double expected, double result) {
46     if (expected != result) {
47       throw new Error("Expected: " + expected + ", found: " + result);
48     }
49   }
50 
assertEquals(String expected, double result)51   public static void assertEquals(String expected, double result) {
52     if (!expected.equals(new Double(result).toString())) {
53       throw new Error("Expected: " + expected + ", found: " + result);
54     }
55   }
56 
assertIsNaN(float result)57   public static void assertIsNaN(float result) {
58     if (!Float.isNaN(result)) {
59       throw new Error("Expected NaN: " + result);
60     }
61   }
62 
assertIsNaN(double result)63   public static void assertIsNaN(double result) {
64     if (!Double.isNaN(result)) {
65       throw new Error("Expected NaN: " + result);
66     }
67   }
68 
main(String[] args)69   public static void main(String[] args) {
70     negInt();
71     $opt$InplaceNegOneInt(1);
72 
73     negLong();
74     $opt$InplaceNegOneLong(1L);
75 
76     negFloat();
77     negDouble();
78   }
79 
negInt()80   private static void negInt() {
81     assertEquals(-1, $opt$NegInt(1));
82     assertEquals(1, $opt$NegInt(-1));
83     assertEquals(0, $opt$NegInt(0));
84     assertEquals(51, $opt$NegInt(-51));
85     assertEquals(-51, $opt$NegInt(51));
86     assertEquals(2147483647, $opt$NegInt(-2147483647));  // -(2^31 - 1)
87     assertEquals(-2147483647, $opt$NegInt(2147483647));  // 2^31 - 1
88     // From the Java 7 SE Edition specification:
89     // http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.15.4
90     //
91     //   For integer values, negation is the same as subtraction from
92     //   zero.  The Java programming language uses two's-complement
93     //   representation for integers, and the range of two's-complement
94     //   values is not symmetric, so negation of the maximum negative
95     //   int or long results in that same maximum negative number.
96     //   Overflow occurs in this case, but no exception is thrown.
97     //   For all integer values x, -x equals (~x)+1.''
98     assertEquals(-2147483648, $opt$NegInt(-2147483648)); // -(2^31)
99   }
100 
$opt$InplaceNegOneInt(int a)101   private static void $opt$InplaceNegOneInt(int a) {
102     a = -a;
103     assertEquals(-1, a);
104   }
105 
negLong()106   private static void negLong() {
107     assertEquals(-1L, $opt$NegLong(1L));
108     assertEquals(1L, $opt$NegLong(-1L));
109     assertEquals(0L, $opt$NegLong(0L));
110     assertEquals(51L, $opt$NegLong(-51L));
111     assertEquals(-51L, $opt$NegLong(51L));
112 
113     assertEquals(2147483647L, $opt$NegLong(-2147483647L));  // -(2^31 - 1)
114     assertEquals(-2147483647L, $opt$NegLong(2147483647L));  // (2^31 - 1)
115     assertEquals(2147483648L, $opt$NegLong(-2147483648L));  // -(2^31)
116     assertEquals(-2147483648L, $opt$NegLong(2147483648L));  // 2^31
117 
118     assertEquals(9223372036854775807L, $opt$NegLong(-9223372036854775807L));  // -(2^63 - 1)
119     assertEquals(-9223372036854775807L, $opt$NegLong(9223372036854775807L));  // 2^63 - 1
120     // See remark regarding the negation of the maximum negative
121     // (long) value in negInt().
122     assertEquals(-9223372036854775808L, $opt$NegLong(-9223372036854775808L)); // -(2^63)
123   }
124 
$opt$InplaceNegOneLong(long a)125   private static void $opt$InplaceNegOneLong(long a) {
126     a = -a;
127     assertEquals(-1L, a);
128   }
129 
negFloat()130   private static void negFloat() {
131      assertEquals("-0.0", $opt$NegFloat(0F));
132      assertEquals("0.0", $opt$NegFloat(-0F));
133      assertEquals(-1F, $opt$NegFloat(1F));
134      assertEquals(1F, $opt$NegFloat(-1F));
135      assertEquals(51F, $opt$NegFloat(-51F));
136      assertEquals(-51F, $opt$NegFloat(51F));
137 
138      assertEquals(-0.1F, $opt$NegFloat(0.1F));
139      assertEquals(0.1F, $opt$NegFloat(-0.1F));
140      assertEquals(343597.38362F, $opt$NegFloat(-343597.38362F));
141      assertEquals(-343597.38362F, $opt$NegFloat(343597.38362F));
142 
143      assertEquals(-Float.MIN_NORMAL, $opt$NegFloat(Float.MIN_NORMAL));
144      assertEquals(Float.MIN_NORMAL, $opt$NegFloat(-Float.MIN_NORMAL));
145      assertEquals(-Float.MIN_VALUE, $opt$NegFloat(Float.MIN_VALUE));
146      assertEquals(Float.MIN_VALUE, $opt$NegFloat(-Float.MIN_VALUE));
147      assertEquals(-Float.MAX_VALUE, $opt$NegFloat(Float.MAX_VALUE));
148      assertEquals(Float.MAX_VALUE, $opt$NegFloat(-Float.MAX_VALUE));
149 
150      assertEquals(Float.NEGATIVE_INFINITY, $opt$NegFloat(Float.POSITIVE_INFINITY));
151      assertEquals(Float.POSITIVE_INFINITY, $opt$NegFloat(Float.NEGATIVE_INFINITY));
152      assertIsNaN($opt$NegFloat(Float.NaN));
153   }
154 
negDouble()155   private static void negDouble() {
156      assertEquals("-0.0", $opt$NegDouble(0D));
157      assertEquals("0.0", $opt$NegDouble(-0D));
158      assertEquals(-1D, $opt$NegDouble(1D));
159      assertEquals(1D, $opt$NegDouble(-1D));
160      assertEquals(51D, $opt$NegDouble(-51D));
161      assertEquals(-51D, $opt$NegDouble(51D));
162 
163      assertEquals(-0.1D, $opt$NegDouble(0.1D));
164      assertEquals(0.1D, $opt$NegDouble(-0.1D));
165      assertEquals(343597.38362D, $opt$NegDouble(-343597.38362D));
166      assertEquals(-343597.38362D, $opt$NegDouble(343597.38362D));
167 
168      assertEquals(-Double.MIN_NORMAL, $opt$NegDouble(Double.MIN_NORMAL));
169      assertEquals(Double.MIN_NORMAL, $opt$NegDouble(-Double.MIN_NORMAL));
170      assertEquals(-Double.MIN_VALUE, $opt$NegDouble(Double.MIN_VALUE));
171      assertEquals(Double.MIN_VALUE, $opt$NegDouble(-Double.MIN_VALUE));
172      assertEquals(-Double.MAX_VALUE, $opt$NegDouble(Double.MAX_VALUE));
173      assertEquals(Double.MAX_VALUE, $opt$NegDouble(-Double.MAX_VALUE));
174 
175      assertEquals(Double.NEGATIVE_INFINITY, $opt$NegDouble(Double.POSITIVE_INFINITY));
176      assertEquals(Double.POSITIVE_INFINITY, $opt$NegDouble(Double.NEGATIVE_INFINITY));
177      assertIsNaN($opt$NegDouble(Double.NaN));
178   }
179 
$opt$NegInt(int a)180   static int $opt$NegInt(int a){
181     return -a;
182   }
183 
$opt$NegLong(long a)184   static long $opt$NegLong(long a){
185     return -a;
186   }
187 
$opt$NegFloat(float a)188   static float $opt$NegFloat(float a){
189     return -a;
190   }
191 
$opt$NegDouble(double a)192   static double $opt$NegDouble(double a){
193     return -a;
194   }
195 }
196