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

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

@stdlib/constants-float64-high-word-exponent-mask is a package that provides a constant representing the mask for the exponent bits of a double-precision floating-point number (float64). This is useful in low-level bit manipulation tasks, particularly when working with the IEEE 754 standard for floating-point arithmetic.

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

Accessing the Exponent Mask

This feature allows you to access the constant value representing the exponent mask for a double-precision floating-point number. The mask can be used in bitwise operations to isolate or manipulate the exponent bits of a float64 number.

const EXPONENT_MASK = require('@stdlib/constants-float64-high-word-exponent-mask');
console.log(EXPONENT_MASK); // 2146435072

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

math-float64-exponent

The math-float64-exponent package provides utilities for extracting the exponent of a double-precision floating-point number. While it focuses on extracting the exponent, @stdlib/constants-float64-high-word-exponent-mask provides the mask itself for more general bitwise operations.

bit-twiddle

The bit-twiddle package offers a variety of bit manipulation utilities, including functions for working with floating-point numbers. It is more general-purpose compared to @stdlib/constants-float64-high-word-exponent-mask, which specifically provides the exponent mask constant.

README

Exponent Mask

High word mask for the exponent of a double-precision floating-point number.

Installation

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

Usage

var FLOAT64_HIGH_WORD_EXPONENT_MASK = require( '@stdlib/constants-float64-high-word-exponent-mask' );

FLOAT64_HIGH_WORD_EXPONENT_MASK

High word mask for the exponent of a double-precision floating-point number.

// 0x7ff00000 = 2146435072 => 0 11111111111 00000000000000000000
var bool = ( FLOAT64_HIGH_WORD_EXPONENT_MASK === 0x7ff00000 );
// 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 FLOAT64_HIGH_WORD_EXPONENT_MASK = require( '@stdlib/constants-float64-high-word-exponent-mask' );

var out;
var hi;
var x;

x = 11.5;
hi = getHighWord( x ); // => 0 10000000010 01110000000000000000
// returns 1076297728

// Mask off all bits except for the exponent bits:
out = hi & FLOAT64_HIGH_WORD_EXPONENT_MASK; // => 0 10000000010 00000000000000000000
// returns 1075838976

// Mask on the exponent bits and leave other bits unchanged:
out = hi | FLOAT64_HIGH_WORD_EXPONENT_MASK; // => 0 11111111111 01110000000000000000
// returns 2146893824

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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 © 2016-2021. The Stdlib Authors.