@stdlib/constants-float64-high-word-exponent-mask
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    0.0.6 • Public • Published

    Exponent Mask

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    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

    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

    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.

    Install

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

    Homepage

    stdlib.io

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    0.0.6

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