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      1 /*
      2  * Copyright (C) 2015 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 class Main {
     18   public static void main(String[] args) {
     19     testIntShiftRight();
     20     testIntShiftLeft();
     21     testIntUnsignedShiftRight();
     22     testLongShiftRight();
     23     testLongShiftLeft();
     24     testLongUnsignedShiftRight();
     25   }
     26 
     27   public static void testIntShiftLeft() {
     28     int a = myField;
     29     int b = myOtherField << a;
     30     if (b != -2147483648) {
     31       throw new Error("Expected -2147483648, got " + b);
     32     }
     33     if (a != 0xFFF) {
     34       throw new Error("Expected 0xFFF, got " + a);
     35     }
     36   }
     37 
     38   public static void testIntShiftRight() {
     39     int a = myField;
     40     int b = myOtherField >> a;
     41     if (b != 0) {
     42       throw new Error("Expected 0, got " + b);
     43     }
     44     if (a != 0xFFF) {
     45       throw new Error("Expected 0xFFF, got " + a);
     46     }
     47   }
     48 
     49   public static void testIntUnsignedShiftRight() {
     50     int a = myField;
     51     int b = myOtherField >>> a;
     52     if (b != 0) {
     53       throw new Error("Expected 0, got " + b);
     54     }
     55     if (a != 0xFFF) {
     56       throw new Error("Expected 0xFFF, got " + a);
     57     }
     58   }
     59 
     60   public static void testLongShiftLeft() {
     61     long a = myLongField;
     62     long b = myOtherLongField << a;
     63     if (b != 0x2468ACF13579BDEL) {
     64       throw new Error("Expected 0x2468ACF13579BDEL, got " + b);
     65     }
     66     // The int conversion will be GVN'ed with the one required
     67     // by Java specification of long shift left.
     68     if ((int)a != 0x41) {
     69       throw new Error("Expected 0x41, got " + a);
     70     }
     71   }
     72 
     73   public static void testLongShiftRight() {
     74     long a = myLongField;
     75     long b = myOtherLongField >> a;
     76     if (b != 0x91A2B3C4D5E6F7L) {
     77       throw new Error("Expected 0x91A2B3C4D5E6F7L, got " + b);
     78     }
     79     // The int conversion will be GVN'ed with the one required
     80     // by Java specification of long shift right.
     81     if ((int)a != 0x41) {
     82       throw new Error("Expected 0x41, got " + a);
     83     }
     84   }
     85 
     86   public static void testLongUnsignedShiftRight() {
     87     long a = myLongField;
     88     long b = myOtherLongField >>> a;
     89     if (b != 0x91A2B3C4D5E6F7L) {
     90       throw new Error("Expected 0x91A2B3C4D5E6F7L, got " + b);
     91     }
     92     // The int conversion will be GVN'ed with the one required
     93     // by Java specification of long shift right.
     94     if ((int)a != 0x41) {
     95       throw new Error("Expected 0x41, got " + a);
     96     }
     97   }
     98 
     99   static int myField = 0xFFF;
    100   static int myOtherField = 0x1;
    101 
    102   // Use a value that will need to be masked before doing the shift.
    103   // The maximum shift is 0x3F.
    104   static long myLongField = 0x41;
    105   static long myOtherLongField = 0x123456789abcdefL;
    106 }
    107