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 public class Main { 18 19 static double dPi = Math.PI; 20 static float fPi = (float)Math.PI; 21 22 public static void expectEquals(long expected, long result) { 23 if (expected != result) { 24 throw new Error("Expected: " + expected + ", found: " + result); 25 } 26 } 27 28 public static void expectEquals(int expected, int result) { 29 if (expected != result) { 30 throw new Error("Expected: " + expected + ", found: " + result); 31 } 32 } 33 34 public static void divDoubleTest() { 35 double d1 = 0x1.0p1023; 36 double d2 = -2.0; 37 double d3 = 0.0; 38 double d4 = Double.MIN_NORMAL; 39 double d5 = Double.POSITIVE_INFINITY; 40 double d6 = Double.NEGATIVE_INFINITY; 41 double d7 = -0.0; 42 double d8 = Double.MAX_VALUE; 43 double d9 = Double.MIN_VALUE; 44 double dNaN = Double.NaN; 45 46 expectEquals(Double.doubleToRawLongBits(dPi/d1), 0x1921fb54442d18L); 47 expectEquals(Double.doubleToRawLongBits(dPi/d2), 0xbff921fb54442d18L); 48 expectEquals(Double.doubleToRawLongBits(dPi/d3), 0x7ff0000000000000L); 49 expectEquals(Double.doubleToRawLongBits(dPi/d4), 0x7fe921fb54442d18L); 50 expectEquals(Double.doubleToRawLongBits(dPi/d5), 0x0L); 51 expectEquals(Double.doubleToRawLongBits(dPi/d6), 0x8000000000000000L); 52 expectEquals(Double.doubleToRawLongBits(dPi/d7), 0xfff0000000000000L); 53 54 expectEquals(Double.doubleToRawLongBits(dPi/d8), 0xc90fdaa22168cL); 55 expectEquals(Double.doubleToRawLongBits(dPi/d9), 0x7ff0000000000000L); 56 57 // Not-a-number computation. Use doubleToLongBits to get canonical NaN. The literal value 58 // is the canonical NaN (see Double.doubleToLongBits). 59 expectEquals(Double.doubleToLongBits(dPi/dNaN), 0x7ff8000000000000L); 60 } 61 62 public static void divFloatTest() { 63 float f1 = 0x1.0p127f; 64 float f2 = -2.0f; 65 float f3 = 0.0f; 66 float f4 = Float.MIN_NORMAL; 67 float f5 = Float.POSITIVE_INFINITY; 68 float f6 = Float.NEGATIVE_INFINITY; 69 float f7 = -0.0f; 70 float f8 = Float.MAX_VALUE; 71 float f9 = Float.MIN_VALUE; 72 float fNaN = Float.NaN; 73 74 expectEquals(Float.floatToRawIntBits(fPi/f1), 0xc90fdb); 75 expectEquals(Float.floatToRawIntBits(fPi/f2), 0xbfc90fdb); 76 expectEquals(Float.floatToRawIntBits(fPi/f3), 0x7f800000); 77 expectEquals(Float.floatToRawIntBits(fPi/f4), 0x7f490fdb); 78 expectEquals(Float.floatToRawIntBits(fPi/f5), 0x0); 79 expectEquals(Float.floatToRawIntBits(fPi/f6), 0x80000000); 80 expectEquals(Float.floatToRawIntBits(fPi/f7), 0xff800000); 81 82 expectEquals(Float.floatToRawIntBits(fPi/f8), 0x6487ee); 83 expectEquals(Float.floatToRawIntBits(fPi/f9), 0x7f800000); 84 85 // Not-a-number computation. Use floatToIntBits to get canonical NaN. The literal value 86 // is the canonical NaN (see Float.floatToIntBits). 87 expectEquals(Float.floatToIntBits(fPi/fNaN), 0x7fc00000); 88 } 89 90 public static void main(String[] args) { 91 divDoubleTest(); 92 divFloatTest(); 93 System.out.println("Done!"); 94 } 95 96 } 97
