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    @stdlib/math-base-special-imuldw
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    0.0.6 • Public • Published

    imuldw

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    Compute the double word product of two signed 32-bit integers.

    Installation

    npm install @stdlib/math-base-special-imuldw

    Usage

    var imuldw = require( '@stdlib/math-base-special-imuldw' );

    imuldw( [out,] a, b )

    Multiplies two signed 32-bit integers and returns an array of two signed 32-bit integers which represents the signed 64-bit integer product.

    var v = imuldw( 1, 10 );
    // returns [ 0, 10 ]
    
    v = imuldw( 0x80000000|0, 0x40000000|0 ); // -(2^31) * 2^30 = -2305843009213694000 => 32-bit integer overflow
    // returns [ -536870912, 0 ]

    Notes

    Examples

    var lpad = require( '@stdlib/string-left-pad' );
    var imuldw = require( '@stdlib/math-base-special-imuldw' );
    
    var i;
    var j;
    var y;
    
    for ( i = 0x7FFFFFF0; i < 0x7FFFFFFF; i++ ) {
        for ( j = i; j < 0x7FFFFFFF; j++) {
            y = imuldw( i|0, j|0 );
            console.log( '%d x %d = 0x%s%s', i|0, j|0, lpad( ( y[0] >>> 0 ).toString( 16 ), 8, '0'), lpad( ( y[1] >>> 0 ).toString( 16 ), 8, '0' ) );
        }
    }

    Notice

    This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

    For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2021. The Stdlib Authors.

    Install

    npm i @stdlib/math-base-special-imuldw

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    1

    Version

    0.0.6

    License

    Apache-2.0

    Unpacked Size

    39.5 kB

    Total Files

    9

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    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser