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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
gTestfile = '11.7.3.js';
/**
File Name: 11.7.3.js
ECMA Section: 11.7.3 The unsigned right shift operator ( >>> )
Description:
11.7.3 The unsigned right shift operator ( >>> )
Performs a zero-filling bitwise right shift operation on the left argument
by the amount specified by the right argument.
The production ShiftExpression : ShiftExpression >>> AdditiveExpression is
evaluated as follows:
1. Evaluate ShiftExpression.
2. Call GetValue(Result(1)).
3. Evaluate AdditiveExpression.
4. Call GetValue(Result(3)).
5. Call ToUint32(Result(2)).
6. Call ToUint32(Result(4)).
7. Mask out all but the least significant 5 bits of Result(6), that is,
compute Result(6) & 0x1F.
8. Perform zero-filling right shift of Result(5) by Result(7) bits.
Vacated bits are filled with zero. The result is an unsigned 32 bit
integer.
9. Return Result(8).
Author: christine@netscape.com
Date: 12 november 1997
*/
var SECTION = "11.7.3";
var VERSION = "ECMA_1";
startTest();
writeHeaderToLog( SECTION + " The unsigned right shift operator ( >>> )");
var addexp = 0;
var power = 0;
for ( power = 0; power <= 32; power++ ) {
shiftexp = Math.pow( 2, power );
for ( addexp = 0; addexp <= 32; addexp++ ) {
new TestCase( SECTION,
shiftexp + " >>> " + addexp,
UnsignedRightShift( shiftexp, addexp ),
shiftexp >>> addexp );
}
}
test();
function ToInteger( n ) {
n = Number( n );
var sign = ( n < 0 ) ? -1 : 1;
if ( n != n ) {
return 0;
}
if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY ) {
return n;
}
return ( sign * Math.floor(Math.abs(n)) );
}
function ToInt32( n ) {
n = Number( n );
var sign = ( n < 0 ) ? -1 : 1;
if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY) {
return 0;
}
n = (sign * Math.floor( Math.abs(n) )) % Math.pow(2,32);
n = ( n >= Math.pow(2,31) ) ? n - Math.pow(2,32) : n;
return ( n );
}
function ToUint32( n ) {
n = Number( n );
var sign = ( n < 0 ) ? -1 : 1;
if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY) {
return 0;
}
n = sign * Math.floor( Math.abs(n) )
n = n % Math.pow(2,32);
if ( n < 0 ){
n += Math.pow(2,32);
}
return ( n );
}
function ToUint16( n ) {
var sign = ( n < 0 ) ? -1 : 1;
if ( Math.abs( n ) == 0 || Math.abs( n ) == Number.POSITIVE_INFINITY) {
return 0;
}
n = ( sign * Math.floor( Math.abs(n) ) ) % Math.pow(2,16);
if (n <0) {
n += Math.pow(2,16);
}
return ( n );
}
function Mask( b, n ) {
b = ToUint32BitString( b );
b = b.substring( b.length - n );
b = ToUint32Decimal( b );
return ( b );
}
function ToUint32BitString( n ) {
var b = "";
for ( p = 31; p >=0; p-- ) {
if ( n >= Math.pow(2,p) ) {
b += "1";
n -= Math.pow(2,p);
} else {
b += "0";
}
}
return b;
}
function ToInt32BitString( n ) {
var b = "";
var sign = ( n < 0 ) ? -1 : 1;
b += ( sign == 1 ) ? "0" : "1";
for ( p = 30; p >=0; p-- ) {
if ( (sign == 1 ) ? sign * n >= Math.pow(2,p) : sign * n > Math.pow(2,p) ) {
b += ( sign == 1 ) ? "1" : "0";
n -= sign * Math.pow( 2, p );
} else {
b += ( sign == 1 ) ? "0" : "1";
}
}
return b;
}
function ToInt32Decimal( bin ) {
var r = 0;
var sign;
if ( Number(bin.charAt(0)) == 0 ) {
sign = 1;
r = 0;
} else {
sign = -1;
r = -(Math.pow(2,31));
}
for ( var j = 0; j < 31; j++ ) {
r += Math.pow( 2, j ) * Number(bin.charAt(31-j));
}
return r;
}
function ToUint32Decimal( bin ) {
var r = 0;
for ( l = bin.length; l < 32; l++ ) {
bin = "0" + bin;
}
for ( j = 0; j < 32; j++ ) {
r += Math.pow( 2, j ) * Number(bin.charAt(31-j));
}
return r;
}
function RShift( s, a ) {
s = ToUint32BitString( s );
for ( z = 0; z < a; z++ ) {
s = "0" + s;
}
s = s.substring( 0, s.length - a );
return ToUint32Decimal(s);
}
function UnsignedRightShift( s, a ) {
s = ToUint32( s );
a = ToUint32( a );
a = Mask( a, 5 );
return ( RShift( s, a ) );
}
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