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      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 test
     18 // it does compile the method, and that $noinline$ is a marker to
     19 // test that it does not inline it.
     20 public class Main {
     21 
     22   public static void assertEquals(int expected, int result) {
     23     if (expected != result) {
     24       throw new Error("Expected: " + expected + ", found: " + result);
     25     }
     26   }
     27 
     28   public static void assertEquals(long expected, long result) {
     29     if (expected != result) {
     30       throw new Error("Expected: " + expected + ", found: " + result);
     31     }
     32   }
     33 
     34   public static void assertEquals(float expected, float result) {
     35     if (expected != result) {
     36       throw new Error("Expected: " + expected + ", found: " + result);
     37     }
     38   }
     39 
     40   public static void assertEquals(String expected, float result) {
     41     if (!expected.equals(new Float(result).toString())) {
     42       throw new Error("Expected: " + expected + ", found: " + result);
     43     }
     44   }
     45 
     46   public static void assertEquals(double expected, double result) {
     47     if (expected != result) {
     48       throw new Error("Expected: " + expected + ", found: " + result);
     49     }
     50   }
     51 
     52   public static void assertEquals(String expected, double result) {
     53     if (!expected.equals(new Double(result).toString())) {
     54       throw new Error("Expected: " + expected + ", found: " + result);
     55     }
     56   }
     57 
     58   public static void assertIsNaN(float result) {
     59     if (!Float.isNaN(result)) {
     60       throw new Error("Expected NaN: " + result);
     61     }
     62   }
     63 
     64   public static void assertIsNaN(double result) {
     65     if (!Double.isNaN(result)) {
     66       throw new Error("Expected NaN: " + result);
     67     }
     68   }
     69 
     70   public static void main(String[] args) {
     71     negInt();
     72     $opt$noinline$InplaceNegOneInt(1);
     73 
     74     negLong();
     75     $opt$noinline$InplaceNegOneLong(1L);
     76 
     77     negFloat();
     78     negDouble();
     79   }
     80 
     81   private static void negInt() {
     82     assertEquals(-1, $opt$noinline$NegInt(1));
     83     assertEquals(1, $opt$noinline$NegInt(-1));
     84     assertEquals(0, $opt$noinline$NegInt(0));
     85     assertEquals(51, $opt$noinline$NegInt(-51));
     86     assertEquals(-51, $opt$noinline$NegInt(51));
     87     assertEquals(2147483647, $opt$noinline$NegInt(-2147483647));  // -(2^31 - 1)
     88     assertEquals(-2147483647, $opt$noinline$NegInt(2147483647));  // 2^31 - 1
     89     // From the Java 7 SE Edition specification:
     90     // http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.15.4
     91     //
     92     //   For integer values, negation is the same as subtraction from
     93     //   zero.  The Java programming language uses two's-complement
     94     //   representation for integers, and the range of two's-complement
     95     //   values is not symmetric, so negation of the maximum negative
     96     //   int or long results in that same maximum negative number.
     97     //   Overflow occurs in this case, but no exception is thrown.
     98     //   For all integer values x, -x equals (~x)+1.''
     99     assertEquals(-2147483648, $opt$noinline$NegInt(-2147483648)); // -(2^31)
    100   }
    101 
    102   private static void negLong() {
    103     assertEquals(-1L, $opt$noinline$NegLong(1L));
    104     assertEquals(1L, $opt$noinline$NegLong(-1L));
    105     assertEquals(0L, $opt$noinline$NegLong(0L));
    106     assertEquals(51L, $opt$noinline$NegLong(-51L));
    107     assertEquals(-51L, $opt$noinline$NegLong(51L));
    108 
    109     assertEquals(2147483647L, $opt$noinline$NegLong(-2147483647L));  // -(2^31 - 1)
    110     assertEquals(-2147483647L, $opt$noinline$NegLong(2147483647L));  // (2^31 - 1)
    111     assertEquals(2147483648L, $opt$noinline$NegLong(-2147483648L));  // -(2^31)
    112     assertEquals(-2147483648L, $opt$noinline$NegLong(2147483648L));  // 2^31
    113 
    114     assertEquals(9223372036854775807L, $opt$noinline$NegLong(-9223372036854775807L));  // -(2^63 - 1)
    115     assertEquals(-9223372036854775807L, $opt$noinline$NegLong(9223372036854775807L));  // 2^63 - 1
    116     // See remark regarding the negation of the maximum negative
    117     // (long) value in negInt().
    118     assertEquals(-9223372036854775808L, $opt$noinline$NegLong(-9223372036854775808L)); // -(2^63)
    119   }
    120 
    121   private static void negFloat() {
    122      assertEquals("-0.0", $opt$noinline$NegFloat(0F));
    123      assertEquals("0.0", $opt$noinline$NegFloat(-0F));
    124      assertEquals(-1F, $opt$noinline$NegFloat(1F));
    125      assertEquals(1F, $opt$noinline$NegFloat(-1F));
    126      assertEquals(51F, $opt$noinline$NegFloat(-51F));
    127      assertEquals(-51F, $opt$noinline$NegFloat(51F));
    128 
    129      assertEquals(-0.1F, $opt$noinline$NegFloat(0.1F));
    130      assertEquals(0.1F, $opt$noinline$NegFloat(-0.1F));
    131      assertEquals(343597.38362F, $opt$noinline$NegFloat(-343597.38362F));
    132      assertEquals(-343597.38362F, $opt$noinline$NegFloat(343597.38362F));
    133 
    134      assertEquals(-Float.MIN_NORMAL, $opt$noinline$NegFloat(Float.MIN_NORMAL));
    135      assertEquals(Float.MIN_NORMAL, $opt$noinline$NegFloat(-Float.MIN_NORMAL));
    136      assertEquals(-Float.MIN_VALUE, $opt$noinline$NegFloat(Float.MIN_VALUE));
    137      assertEquals(Float.MIN_VALUE, $opt$noinline$NegFloat(-Float.MIN_VALUE));
    138      assertEquals(-Float.MAX_VALUE, $opt$noinline$NegFloat(Float.MAX_VALUE));
    139      assertEquals(Float.MAX_VALUE, $opt$noinline$NegFloat(-Float.MAX_VALUE));
    140 
    141      assertEquals(Float.NEGATIVE_INFINITY, $opt$noinline$NegFloat(Float.POSITIVE_INFINITY));
    142      assertEquals(Float.POSITIVE_INFINITY, $opt$noinline$NegFloat(Float.NEGATIVE_INFINITY));
    143      assertIsNaN($opt$noinline$NegFloat(Float.NaN));
    144   }
    145 
    146   private static void negDouble() {
    147      assertEquals("-0.0", $opt$noinline$NegDouble(0D));
    148      assertEquals("0.0", $opt$noinline$NegDouble(-0D));
    149      assertEquals(-1D, $opt$noinline$NegDouble(1D));
    150      assertEquals(1D, $opt$noinline$NegDouble(-1D));
    151      assertEquals(51D, $opt$noinline$NegDouble(-51D));
    152      assertEquals(-51D, $opt$noinline$NegDouble(51D));
    153 
    154      assertEquals(-0.1D, $opt$noinline$NegDouble(0.1D));
    155      assertEquals(0.1D, $opt$noinline$NegDouble(-0.1D));
    156      assertEquals(343597.38362D, $opt$noinline$NegDouble(-343597.38362D));
    157      assertEquals(-343597.38362D, $opt$noinline$NegDouble(343597.38362D));
    158 
    159      assertEquals(-Double.MIN_NORMAL, $opt$noinline$NegDouble(Double.MIN_NORMAL));
    160      assertEquals(Double.MIN_NORMAL, $opt$noinline$NegDouble(-Double.MIN_NORMAL));
    161      assertEquals(-Double.MIN_VALUE, $opt$noinline$NegDouble(Double.MIN_VALUE));
    162      assertEquals(Double.MIN_VALUE, $opt$noinline$NegDouble(-Double.MIN_VALUE));
    163      assertEquals(-Double.MAX_VALUE, $opt$noinline$NegDouble(Double.MAX_VALUE));
    164      assertEquals(Double.MAX_VALUE, $opt$noinline$NegDouble(-Double.MAX_VALUE));
    165 
    166      assertEquals(Double.NEGATIVE_INFINITY, $opt$noinline$NegDouble(Double.POSITIVE_INFINITY));
    167      assertEquals(Double.POSITIVE_INFINITY, $opt$noinline$NegDouble(Double.NEGATIVE_INFINITY));
    168      assertIsNaN($opt$noinline$NegDouble(Double.NaN));
    169   }
    170 
    171 
    172   static boolean doThrow = false;
    173 
    174   private static void $opt$noinline$InplaceNegOneInt(int a) {
    175     if (doThrow) {
    176       // Try defeating inlining.
    177       throw new Error();
    178     }
    179     a = -a;
    180     assertEquals(-1, a);
    181   }
    182 
    183   private static void $opt$noinline$InplaceNegOneLong(long a) {
    184     if (doThrow) {
    185       // Try defeating inlining.
    186       throw new Error();
    187     }
    188     a = -a;
    189     assertEquals(-1L, a);
    190   }
    191 
    192   private static int $opt$noinline$NegInt(int a){
    193     if (doThrow) {
    194       // Try defeating inlining.
    195       throw new Error();
    196     }
    197     return -a;
    198   }
    199 
    200   private static long $opt$noinline$NegLong(long a){
    201     if (doThrow) {
    202       // Try defeating inlining.
    203       throw new Error();
    204     }
    205     return -a;
    206   }
    207 
    208   private static float $opt$noinline$NegFloat(float a){
    209     if (doThrow) {
    210       // Try defeating inlining.
    211       throw new Error();
    212     }
    213     return -a;
    214   }
    215 
    216   private static double $opt$noinline$NegDouble(double a){
    217     if (doThrow) {
    218       // Try defeating inlining.
    219       throw new Error();
    220     }
    221     return -a;
    222   }
    223 }
    224