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// Flags: --allow-natives-syntax 29// Test some dead code elimination scenarios 30 31function dead1(x, y) { 32 var a = x | 0, b = y | 0; 33 a * b; 34 a << b; 35 a >> b; 36 a >>> b; 37 a | b; 38 a & b; 39 a ^ b; 40 return x; 41} 42 43function dead2(x, y) { 44 var a = x | 0, b = y | 0; 45 (a | 0) * b; 46 (a | 0) << b; 47 (a | 0) >> b; 48 (a | 0) >>> b; 49 (a | 0) | b; 50 (a | 0) & b; 51 (a | 0) ^ b; 52 return x; 53} 54 55function dead3(a, b) { 56 a == 2 ? (a * b) : (b * a); // dead 57 return a; 58} 59 60assertTrue(dead1(33, 32) == 33); 61assertTrue(dead1(33, 32) == 33); 62%OptimizeFunctionOnNextCall(dead1); 63assertTrue(dead1(33, 32) == 33); 64 65assertTrue(dead2(34, 11) == 34); 66assertTrue(dead2(34, 11) == 34); 67%OptimizeFunctionOnNextCall(dead2); 68assertTrue(dead2(34, 11) == 34); 69 70assertTrue(dead3(35, 12) == 35); 71assertTrue(dead3(35, 12) == 35); 72%OptimizeFunctionOnNextCall(dead3); 73assertTrue(dead3(35, 12) == 35); 74