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Author message:

This package has been renamed. Use `@stdlib/math-base-ops-imuldw` instead.

@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.

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

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  • stdlib-bot