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number-uint32-base-muldw

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

https://github.com/stdlib-js/number-uint32-base-muldw

Science Score: 44.0%

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Keywords

32-bit double-word imuldw integer javascript math mathematics mult multiplication multiply node node-js nodejs overflow stdlib uint uint32 umuldw unsigned
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Compute the double word product of two unsigned 32-bit integers.

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32-bit double-word imuldw integer javascript math mathematics mult multiplication multiply node node-js nodejs overflow stdlib uint uint32 umuldw unsigned
Created 10 months ago · Last pushed 5 months ago
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README.md

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umuldw

NPM version Build Status Coverage Status <!-- dependencies -->

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

## Installation ```bash npm install @stdlib/number-uint32-base-muldw ``` Alternatively, - To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]). - If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions). - For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]). The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships. To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage ```javascript var umuldw = require( '@stdlib/number-uint32-base-muldw' ); ``` #### umuldw( a, b ) Multiplies two unsigned 32-bit integers and returns an `array` of two unsigned 32-bit integers (in big endian order) which represents the unsigned 64-bit integer product. ```javascript var v = umuldw( 1, 10 ); // returns [ 0, 10 ] v = umuldw( 0x80000000, 0x80000000 ); // 2^31 * 2^31 = 4611686018427388000 => 32-bit integer overflow // returns [ 1073741824, 0 ] ``` #### umuldw.assign( a, b, out, stride, offset ) Multiplies two unsigned 32-bit integers and assigns results representing the unsigned 64-bit integer product (in big endian order) to a provided output array. ```javascript var out = [ 0, 0 ]; var v = umuldw.assign( 1, 10, out, 1, 0 ); // returns [ 0, 10 ] var bool = ( v === out ); // returns true ```
## Notes - When computing the product of 32-bit integer values in double-precision floating-point format (the default JavaScript numeric data type), computing the double word product is necessary in order to **avoid** exceeding the [maximum safe double-precision floating-point integer value][@stdlib/constants/float64/max-safe-integer].
## Examples ```javascript var lpad = require( '@stdlib/string-left-pad' ); var umuldw = require( '@stdlib/number-uint32-base-muldw' ); var i; var j; var y; for ( i = 0xFFFFFFF0; i < 0xFFFFFFFF; i++ ) { for ( j = i; j < 0xFFFFFFFF; j++) { y = umuldw( i, j ); console.log( '%d x %d = 0x%s%s', i, j, lpad( y[0].toString( 16 ), 8, '0' ), lpad( y[1].toString( 16 ), 8, '0' ) ); } } ```
* * * ## See Also - [`@stdlib/number-int32/base/muldw`][@stdlib/number/int32/base/muldw]: compute the double word product of two signed 32-bit integers. - [`@stdlib/number-uint32/base/mul`][@stdlib/number/uint32/base/mul]: multiply two unsigned 32-bit integers.
* * * ## Notice This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].

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Standard library for JavaScript.

Citation (CITATION.cff) 

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

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