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 toInt32(x) { 29 return x | 0; 30 } 31 32 assertEquals(0, toInt32(Infinity), "Inf"); 33 assertEquals(0, toInt32(-Infinity), "-Inf"); 34 assertEquals(0, toInt32(NaN), "NaN"); 35 assertEquals(0, toInt32(0.0), "zero"); 36 assertEquals(0, toInt32(-0.0), "-zero"); 37 38 assertEquals(0, toInt32(Number.MIN_VALUE)); 39 assertEquals(0, toInt32(-Number.MIN_VALUE)); 40 assertEquals(0, toInt32(0.1)); 41 assertEquals(0, toInt32(-0.1)); 42 assertEquals(1, toInt32(1), "one"); 43 assertEquals(1, toInt32(1.1), "onepointone"); 44 assertEquals(-1, toInt32(-1), "-one"); 45 assertEquals(0, toInt32(0.6), "truncate positive (0.6)"); 46 assertEquals(1, toInt32(1.6), "truncate positive (1.6)"); 47 assertEquals(0, toInt32(-0.6), "truncate negative (-0.6)"); 48 assertEquals(-1, toInt32(-1.6), "truncate negative (-1.6)"); 49 50 assertEquals(2147483647, toInt32(2147483647)); 51 assertEquals(-2147483648, toInt32(2147483648)); 52 assertEquals(-2147483647, toInt32(2147483649)); 53 54 assertEquals(-1, toInt32(4294967295)); 55 assertEquals(0, toInt32(4294967296)); 56 assertEquals(1, toInt32(4294967297)); 57 58 assertEquals(-2147483647, toInt32(-2147483647)); 59 assertEquals(-2147483648, toInt32(-2147483648)); 60 assertEquals(2147483647, toInt32(-2147483649)); 61 62 assertEquals(1, toInt32(-4294967295)); 63 assertEquals(0, toInt32(-4294967296)); 64 assertEquals(-1, toInt32(-4294967297)); 65 66 assertEquals(-2147483648, toInt32(2147483648.25)); 67 assertEquals(-2147483648, toInt32(2147483648.5)); 68 assertEquals(-2147483648, toInt32(2147483648.75)); 69 assertEquals(-1, toInt32(4294967295.25)); 70 assertEquals(-1, toInt32(4294967295.5)); 71 assertEquals(-1, toInt32(4294967295.75)); 72 assertEquals(-1294967296, toInt32(3000000000.25)); 73 assertEquals(-1294967296, toInt32(3000000000.5)); 74 assertEquals(-1294967296, toInt32(3000000000.75)); 75 76 assertEquals(-2147483648, toInt32(-2147483648.25)); 77 assertEquals(-2147483648, toInt32(-2147483648.5)); 78 assertEquals(-2147483648, toInt32(-2147483648.75)); 79 assertEquals(1, toInt32(-4294967295.25)); 80 assertEquals(1, toInt32(-4294967295.5)); 81 assertEquals(1, toInt32(-4294967295.75)); 82 assertEquals(1294967296, toInt32(-3000000000.25)); 83 assertEquals(1294967296, toInt32(-3000000000.5)); 84 assertEquals(1294967296, toInt32(-3000000000.75)); 85 86 var base = Math.pow(2, 64); 87 assertEquals(0, toInt32(base + 0)); 88 assertEquals(0, toInt32(base + 1117)); 89 assertEquals(4096, toInt32(base + 2234)); 90 assertEquals(4096, toInt32(base + 3351)); 91 assertEquals(4096, toInt32(base + 4468)); 92 assertEquals(4096, toInt32(base + 5585)); 93 assertEquals(8192, toInt32(base + 6702)); 94 assertEquals(8192, toInt32(base + 7819)); 95 assertEquals(8192, toInt32(base + 8936)); 96 assertEquals(8192, toInt32(base + 10053)); 97 assertEquals(12288, toInt32(base + 11170)); 98 assertEquals(12288, toInt32(base + 12287)); 99 assertEquals(12288, toInt32(base + 13404)); 100 assertEquals(16384, toInt32(base + 14521)); 101 assertEquals(16384, toInt32(base + 15638)); 102 assertEquals(16384, toInt32(base + 16755)); 103 assertEquals(16384, toInt32(base + 17872)); 104 assertEquals(20480, toInt32(base + 18989)); 105 assertEquals(20480, toInt32(base + 20106)); 106 assertEquals(20480, toInt32(base + 21223)); 107 assertEquals(20480, toInt32(base + 22340)); 108 assertEquals(24576, toInt32(base + 23457)); 109 assertEquals(24576, toInt32(base + 24574)); 110 assertEquals(24576, toInt32(base + 25691)); 111 assertEquals(28672, toInt32(base + 26808)); 112 assertEquals(28672, toInt32(base + 27925)); 113 assertEquals(28672, toInt32(base + 29042)); 114 assertEquals(28672, toInt32(base + 30159)); 115 assertEquals(32768, toInt32(base + 31276)); 116 117 // bignum is (2^53 - 1) * 2^31 - highest number with bit 31 set. 118 var bignum = Math.pow(2, 84) - Math.pow(2, 31); 119 assertEquals(-Math.pow(2,31), toInt32(bignum)); 120 assertEquals(-Math.pow(2,31), toInt32(-bignum)); 121 assertEquals(0, toInt32(2 * bignum)); 122 assertEquals(0, toInt32(-(2 * bignum))); 123 assertEquals(0, toInt32(bignum - Math.pow(2,31))); 124 assertEquals(0, toInt32(-(bignum - Math.pow(2,31)))); 125 126 // max_fraction is largest number below 1. 127 var max_fraction = (1 - Math.pow(2,-53)); 128 assertEquals(0, toInt32(max_fraction)); 129 assertEquals(0, toInt32(-max_fraction)); 130
