1// Copyright 2009 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// Test the paths in the code generator where values in specific 29// registers get moved around so that the shift operation can use 30// register ECX on ia32 for the shift amount. Other codegen coverage 31// tests should go here too. 32 33 34 35function identity(x) { 36 return x; 37} 38 39function cover_codegen_paths() { 40 var x = 1; 41 var a; // Register EAX 42 var b; // Register EBX 43 var c; // Register ECX 44 var d; // Register EDX 45 // Register ESI is already used. 46 var di; // Register EDI 47 48 while (x == 1) { 49 x = identity(1); 50 a = x + 1; 51 c = x + 1; 52 d = x + 1; 53 b = x + 1; 54 di = x + 1; 55 // Locals are in the corresponding registers here. 56 assertEquals(c << a, 8); 57 58 x = identity(1); 59 a = x + 1; 60 c = x + 1; 61 d = x + 1; 62 b = x + 1; 63 di = x + 1; 64 // Locals are in the corresponding registers here. 65 assertEquals(a << c, 8); 66 67 x = identity(1); 68 a = x + 1; 69 c = x + 1; 70 d = x + 1; 71 b = x + 1; 72 di = x + 1; 73 // Locals are in the corresponding registers here. 74 c = 0; // Free register ecx. 75 assertEquals(a << d, 8); 76 77 x = identity(1); 78 a = x + 1; 79 c = x + 1; 80 d = x + 1; 81 b = x + 1; 82 di = x + 1; 83 // Locals are in the corresponding registers here. 84 b = 0; // Free register ebx. 85 assertEquals(a << d, 8); 86 87 x = 3; 88 } 89} 90 91cover_codegen_paths(); 92