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comparison: js/src/tests/ecma/Expressions/11.7.2.js
js/src/tests/ecma/Expressions/11.7.2.js
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 | |
| 7 /** | |
| 8 File Name: 11.7.2.js | |
| 9 ECMA Section: 11.7.2 The signed right shift operator ( >> ) | |
| 10 Description: | |
| 11 Performs a sign-filling bitwise right shift operation on the left argument | |
| 12 by the amount specified by the right argument. | |
| 13 | |
| 14 The production ShiftExpression : ShiftExpression >> AdditiveExpression is | |
| 15 evaluated as follows: | |
| 16 | |
| 17 1. Evaluate ShiftExpression. | |
| 18 2. Call GetValue(Result(1)). | |
| 19 3. Evaluate AdditiveExpression. | |
| 20 4. Call GetValue(Result(3)). | |
| 21 5. Call ToInt32(Result(2)). | |
| 22 6. Call ToUint32(Result(4)). | |
| 23 7. Mask out all but the least significant 5 bits of Result(6), that is, | |
| 24 compute Result(6) & 0x1F. | |
| 25 8. Perform sign-extending right shift of Result(5) by Result(7) bits. The | |
| 26 most significant bit is propagated. The result is a signed 32 bit | |
| 27 integer. | |
| 28 9. Return Result(8). | |
| 29 | |
| 30 Author: christine@netscape.com | |
| 31 Date: 12 november 1997 | |
| 32 */ | |
| 33 var SECTION = "11.7.2"; | |
| 34 var VERSION = "ECMA_1"; | |
| 35 startTest(); | |
| 36 | |
| 37 writeHeaderToLog( SECTION + " The signed right shift operator ( >> )"); | |
| 38 | |
| 39 var power = 0; | |
| 40 var addexp = 0; | |
| 41 | |
| 42 for ( power = 0; power <= 32; power++ ) { | |
| 43 shiftexp = Math.pow( 2, power ); | |
| 44 | |
| 45 for ( addexp = 0; addexp <= 32; addexp++ ) { | |
| 46 new TestCase( SECTION, | |
| 47 shiftexp + " >> " + addexp, | |
| 48 SignedRightShift( shiftexp, addexp ), | |
| 49 shiftexp >> addexp ); | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 for ( power = 0; power <= 32; power++ ) { | |
| 54 shiftexp = -Math.pow( 2, power ); | |
| 55 | |
| 56 for ( addexp = 0; addexp <= 32; addexp++ ) { | |
| 57 new TestCase( SECTION, | |
| 58 shiftexp + " >> " + addexp, | |
| 59 SignedRightShift( shiftexp, addexp ), | |
| 60 shiftexp >> addexp ); | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 test(); | |
| 65 | |
| 66 function ToInteger( n ) { | |
| 67 n = Number( n ); | |
| 68 var sign = ( n < 0 ) ? -1 : 1; | |
| 69 | |
| 70 if ( n != n ) { | |
| 71 return 0; | |
| 72 } | |
| 73 if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY ) { | |
| 74 return n; | |
| 75 } | |
| 76 return ( sign * Math.floor(Math.abs(n)) ); | |
| 77 } | |
| 78 function ToInt32( n ) { | |
| 79 n = Number( n ); | |
| 80 var sign = ( n < 0 ) ? -1 : 1; | |
| 81 | |
| 82 if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY) { | |
| 83 return 0; | |
| 84 } | |
| 85 | |
| 86 n = (sign * Math.floor( Math.abs(n) )) % Math.pow(2,32); | |
| 87 n = ( n >= Math.pow(2,31) ) ? n - Math.pow(2,32) : n; | |
| 88 | |
| 89 return ( n ); | |
| 90 } | |
| 91 function ToUint32( n ) { | |
| 92 n = Number( n ); | |
| 93 var sign = ( n < 0 ) ? -1 : 1; | |
| 94 | |
| 95 if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY) { | |
| 96 return 0; | |
| 97 } | |
| 98 n = sign * Math.floor( Math.abs(n) ) | |
| 99 | |
| 100 n = n % Math.pow(2,32); | |
| 101 | |
| 102 if ( n < 0 ){ | |
| 103 n += Math.pow(2,32); | |
| 104 } | |
| 105 | |
| 106 return ( n ); | |
| 107 } | |
| 108 function ToUint16( n ) { | |
| 109 var sign = ( n < 0 ) ? -1 : 1; | |
| 110 | |
| 111 if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY) { | |
| 112 return 0; | |
| 113 } | |
| 114 | |
| 115 n = ( sign * Math.floor( Math.abs(n) ) ) % Math.pow(2,16); | |
| 116 | |
| 117 if (n <0) { | |
| 118 n += Math.pow(2,16); | |
| 119 } | |
| 120 | |
| 121 return ( n ); | |
| 122 } | |
| 123 function Mask( b, n ) { | |
| 124 b = ToUint32BitString( b ); | |
| 125 b = b.substring( b.length - n ); | |
| 126 b = ToUint32Decimal( b ); | |
| 127 return ( b ); | |
| 128 } | |
| 129 function ToUint32BitString( n ) { | |
| 130 var b = ""; | |
| 131 for ( p = 31; p >=0; p-- ) { | |
| 132 if ( n >= Math.pow(2,p) ) { | |
| 133 b += "1"; | |
| 134 n -= Math.pow(2,p); | |
| 135 } else { | |
| 136 b += "0"; | |
| 137 } | |
| 138 } | |
| 139 return b; | |
| 140 } | |
| 141 function ToInt32BitString( n ) { | |
| 142 var b = ""; | |
| 143 var sign = ( n < 0 ) ? -1 : 1; | |
| 144 | |
| 145 b += ( sign == 1 ) ? "0" : "1"; | |
| 146 | |
| 147 for ( p = 30; p >=0; p-- ) { | |
| 148 if ( (sign == 1 ) ? sign * n >= Math.pow(2,p) : sign * n > Math.pow(2,p) ) { | |
| 149 b += ( sign == 1 ) ? "1" : "0"; | |
| 150 n -= sign * Math.pow( 2, p ); | |
| 151 } else { | |
| 152 b += ( sign == 1 ) ? "0" : "1"; | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 return b; | |
| 157 } | |
| 158 function ToInt32Decimal( bin ) { | |
| 159 var r = 0; | |
| 160 var sign; | |
| 161 | |
| 162 if ( Number(bin.charAt(0)) == 0 ) { | |
| 163 sign = 1; | |
| 164 r = 0; | |
| 165 } else { | |
| 166 sign = -1; | |
| 167 r = -(Math.pow(2,31)); | |
| 168 } | |
| 169 | |
| 170 for ( var j = 0; j < 31; j++ ) { | |
| 171 r += Math.pow( 2, j ) * Number(bin.charAt(31-j)); | |
| 172 } | |
| 173 | |
| 174 return r; | |
| 175 } | |
| 176 function ToUint32Decimal( bin ) { | |
| 177 var r = 0; | |
| 178 | |
| 179 for ( l = bin.length; l < 32; l++ ) { | |
| 180 bin = "0" + bin; | |
| 181 } | |
| 182 | |
| 183 for ( j = 0; j < 31; j++ ) { | |
| 184 r += Math.pow( 2, j ) * Number(bin.charAt(31-j)); | |
| 185 } | |
| 186 | |
| 187 return r; | |
| 188 } | |
| 189 function SignedRightShift( s, a ) { | |
| 190 s = ToInt32( s ); | |
| 191 a = ToUint32( a ); | |
| 192 a = Mask( a, 5 ); | |
| 193 return ( SignedRShift( s, a ) ); | |
| 194 } | |
| 195 function SignedRShift( s, a ) { | |
| 196 s = ToInt32BitString( s ); | |
| 197 | |
| 198 var firstbit = s.substring(0,1); | |
| 199 | |
| 200 s = s.substring( 1, s.length ); | |
| 201 | |
| 202 for ( var z = 0; z < a; z++ ) { | |
| 203 s = firstbit + s; | |
| 204 } | |
| 205 | |
| 206 s = s.substring( 0, s.length - a); | |
| 207 | |
| 208 s = firstbit +s; | |
| 209 | |
| 210 | |
| 211 return ToInt32(ToInt32Decimal(s)); | |
| 212 } |
