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 unsignedShiftRight(val, shift) { 29 return val >>> shift; 30 } 31 32 assertEquals( 15, unsignedShiftRight(15, 0), "15 >>> 0"); 33 assertEquals( 7, unsignedShiftRight(15, 1), "15 >>> 1"); 34 assertEquals( 3, unsignedShiftRight(15, 2), "15 >>> 2"); 35 36 assertEquals(4294967288, unsignedShiftRight(-8, 0), "-8 >>> 0"); 37 assertEquals(2147483644, unsignedShiftRight(-8, 1), "-8 >>> 1"); 38 assertEquals(1073741822, unsignedShiftRight(-8, 2), "-8 >>> 2"); 39 40 assertEquals( 1, unsignedShiftRight(-8, 31), "-8 >>> 31"); 41 assertEquals(4294967288, unsignedShiftRight(-8, 32), "-8 >>> 32"); 42 assertEquals(2147483644, unsignedShiftRight(-8, 33), "-8 >>> 33"); 43 assertEquals(1073741822, unsignedShiftRight(-8, 34), "-8 >>> 34"); 44 45 assertEquals(2147483648, unsignedShiftRight(0x80000000, 0), "0x80000000 >>> 0"); 46 assertEquals(1073741824, unsignedShiftRight(0x80000000, 1), "0x80000000 >>> 1"); 47 assertEquals( 536870912, unsignedShiftRight(0x80000000, 2), "0x80000000 >>> 2"); 48 49 assertEquals(1073741824, unsignedShiftRight(0x40000000, 0), "0x40000000 >>> 0"); 50 assertEquals( 536870912, unsignedShiftRight(0x40000000, 1), "0x40000000 >>> 1"); 51 assertEquals( 268435456, unsignedShiftRight(0x40000000, 2), "0x40000000 >>> 2"); 52
