1 // Copyright 2008 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 function dead1(a, b) { 29 a * b; 30 a << b; 31 a >> b; 32 a >>> b; 33 a | b; 34 a & b; 35 a ^ b; 36 return a; 37 } 38 39 function dead2(a, b) { 40 (a | 0) * b; 41 (a | 0) << b; 42 (a | 0) >> b; 43 (a | 0) >>> b; 44 (a | 0) | b; 45 (a | 0) & b; 46 (a | 0) ^ b; 47 return a; 48 } 49 50 function dead3(a, b) { 51 a == 2 ? (a * b) : (b * a); // dead 52 return a; 53 } 54 55 function dead4(a) { 56 var z = 3; 57 for (i = 0; i < 3; i++) { 58 z * 3; // dead 59 } 60 return a; 61 } 62 63 function dead5(a) { 64 var z = 3; 65 for (i = 0; i < 3; i++) { 66 z * 3; // dead 67 z++; 68 } 69 var w = z * a; 70 return a; // w is dead 71 } 72 73 assertTrue(dead1(33, 32) == 33); 74 assertTrue(dead2(33, 32) == 33); 75 assertTrue(dead3(33, 32) == 33); 76 assertTrue(dead4(33) == 33); 77 assertTrue(dead5(33) == 33); 78 79 assertTrue(dead1(34, 7) == 34); 80 assertTrue(dead2(34, 7) == 34); 81 assertTrue(dead3(34, 7) == 34); 82 assertTrue(dead4(34) == 34); 83 assertTrue(dead5(34) == 34); 84 85 assertTrue(dead1(3.4, 0.1) == 3.4); 86 assertTrue(dead2(3.4, 0.1) == 3.4); 87 assertTrue(dead3(3.4, 0.1) == 3.4); 88 assertTrue(dead4(3.4) == 3.4); 89 assertTrue(dead5(3.4) == 3.4); 90
