@stdlib/math-base-ops-imuldw

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

https://github.com/stdlib-js/math-base-ops-imuldw

Science Score: 44.0%

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Low similarity (14.4%) to scientific vocabulary

Keywords

32-bit double-word imuldw integer javascript math mathematics mult multiplication multiply node node-js nodejs product stdlib uint uint32 umuldw unsigned

Last synced: 4 months ago · JSON representation ·

Repository

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

Basic Info

Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 720 KB

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Stars: 2
Watchers: 3
Forks: 0
Open Issues: 0
Releases: 0

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32-bit double-word imuldw integer javascript math mathematics mult multiplication multiply node node-js nodejs product stdlib uint uint32 umuldw unsigned

Created about 4 years ago · Last pushed 10 months ago

Metadata Files

Readme Changelog Contributing License Code of conduct Citation Security

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

imuldw

$NPM version$ $Build Status$ $Coverage Status$

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

## Installation ```bash npm install @stdlib/math-base-ops-imuldw ``` 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 imuldw = require( '@stdlib/math-base-ops-imuldw' ); ``` #### imuldw( 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. ```javascript 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 ] ``` #### imuldw.assign( a, b, out, stride, offset ) Multiplies two signed 32-bit integers and assigns results representing the signed 64-bit integer product to a provided output array. ```javascript var out = [ 0, 0 ]; var v = imuldw.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 imuldw = require( '@stdlib/math-base-ops-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][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].

Owner

Name: stdlib
Login: stdlib-js
Kind: organization

Website: https://stdlib.io
Twitter: stdlibjs
Repositories: 3,692
Profile: https://github.com/stdlib-js

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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Push event: 39

Last Year

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Last synced: almost 2 years ago

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Total Commits: 39
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Avg Commits per committer: 39.0
Development Distribution Score (DDS): 0.0

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Commits: 16
Committers: 1
Avg Commits per committer: 16.0
Development Distribution Score (DDS): 0.0

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Average comments per issue: 0
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Total packages: 1
Total downloads: unknown

Total dependent packages: 4
Total dependent repositories: 2
Total versions: 7
Total maintainers: 4

npmjs.org: @stdlib/math-base-ops-imuldw

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

Homepage: https://stdlib.io
License: Apache-2.0
Latest release: 0.2.2
published over 1 year ago

Versions: 7
Dependent Packages: 4
Dependent Repositories: 2
Downloads: 0 Last month

Rankings

Dependent packages count: 4.5%

Dependent repos count: 7.6%

Average: 11.4%

Stargazers count: 14.5%

Downloads: 14.7%

Forks count: 15.4%

Maintainers (4)

planeshifter rreusser stdlib-bot kgryte

Funding

type: opencollective
url: https://opencollective.com/stdlib

Last synced: 4 months ago

Dependencies

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package.json npm

@stdlib/array-float64 ^0.0.x development
@stdlib/assert-has-own-property ^0.0.x development
@stdlib/bench ^0.0.x development
@stdlib/random-base-minstd ^0.0.x development
@stdlib/string-left-pad ^0.0.x development
istanbul ^0.4.1 development
tap-min git+https://github.com/Planeshifter/tap-min.git development
tape git+https://github.com/kgryte/tape.git#fix/globby development
@stdlib/math-base-assert-is-nan ^0.0.x
@stdlib/types ^0.0.x
@stdlib/utils-define-nonenumerable-read-only-property ^0.0.x

@stdlib/math-base-ops-imuldw

Science Score: 44.0%

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imuldw

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