@stdlib/constants-float64-high-word-abs-mask

What is @stdlib/constants-float64-high-word-abs-mask?

@stdlib/constants-float64-high-word-abs-mask is a package that provides a constant for the high word mask used to isolate the absolute value of a double-precision floating-point number. This is useful in low-level bit manipulation tasks where you need to work with the binary representation of floating-point numbers.

What are @stdlib/constants-float64-high-word-abs-mask's main functionalities?

High Word Absolute Mask

This feature provides the constant value for the high word absolute mask. The code sample demonstrates how to import the constant and log its value.

const ABS_MASK = require('@stdlib/constants-float64-high-word-abs-mask');
console.log(ABS_MASK); // 2147483647

Other packages similar to @stdlib/constants-float64-high-word-abs-mask

bit-twiddle

The 'bit-twiddle' package offers a variety of bit manipulation utilities, including functions for working with floating-point numbers at the binary level. It provides more general-purpose bit manipulation functions compared to the specific constant provided by @stdlib/constants-float64-high-word-abs-mask.

README

FLOAT64_HIGH_WORD_ABS_MASK

High word mask for excluding the sign bit of a double-precision floating-point number.

Installation

npm install @stdlib/constants-float64-high-word-abs-mask

Usage

var FLOAT64_HIGH_WORD_ABS_MASK = require( '@stdlib/constants-float64-high-word-abs-mask' );

FLOAT64_HIGH_WORD_ABS_MASK

High word mask for excluding the sign bit of a double-precision floating-point number.

// 0x7fffffff = 2147483647 => 0 11111111111 11111111111111111111
var bool = ( FLOAT64_HIGH_WORD_ABS_MASK === 0x7fffffff );
// returns true

Notes

• The higher order word of a double-precision floating-point number is a 32-bit integer containing the more significant bits which include the exponent and sign.

Examples

var getHighWord = require( '@stdlib/number-float64-base-get-high-word' );
var getLowWord = require( '@stdlib/number-float64-base-get-low-word' );
var fromWords = require( '@stdlib/number-float64-base-from-words' );
var FLOAT64_HIGH_WORD_ABS_MASK = require( '@stdlib/constants-float64-high-word-abs-mask' );

var x = -11.5;
var hi = getHighWord( x ); // 1 10000000010 01110000000000000000
// returns 3223781376

// Turn off the sign bit and leave other bits unchanged:
var out = hi & FLOAT64_HIGH_WORD_ABS_MASK; // 0 10000000010 01110000000000000000
// returns 1076297728

// Generate a new value:
out = fromWords( out, getLowWord( x ) );
// returns 11.5

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C APIs

Usage

#include "stdlib/constants/float64/high_word_abs_mask.h"

STDLIB_CONSTANT_FLOAT64_HIGH_WORD_ABS_MASK

Macro for the high word mask for excluding the sign bit of a double-precision floating-point number.

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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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2022. The Stdlib Authors.

Changelog

0.0.1 (2022-11-11)

No changes reported for this release.

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