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High word mask for the sign bit of a double-precision floating-point number.
npm install @stdlib/constants-float64-high-word-sign-maskAlternatively,
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var FLOAT64_HIGH_WORD_SIGN_MASK = require( '@stdlib/constants-float64-high-word-sign-mask' );High word mask for the sign bit of a double-precision floating-point number.
// 0x80000000 = 2147483648 => 1 00000000000 00000000000000000000
var bool = ( FLOAT64_HIGH_WORD_SIGN_MASK === 0x80000000 );
// returns true- 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.
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_SIGN_MASK = require( '@stdlib/constants-float64-high-word-sign-mask' );
var x = -11.5;
var hi = getHighWord( x ); // 1 10000000010 01110000000000000000
// returns 3223781376
// Mask off all bits except for the sign bit:
var out = (hi & FLOAT64_HIGH_WORD_SIGN_MASK)>>>0; // 1 00000000000 00000000000000000000
// returns 2147483648
// Turn off the sign bit and leave other bits unchanged:
out = hi & (~FLOAT64_HIGH_WORD_SIGN_MASK); // 0 10000000010 01110000000000000000
// returns 1076297728
// Generate a new value:
out = fromWords( out, getLowWord( x ) );
// returns 11.5#include "stdlib/constants/float64/high_word_sign_mask.h"Macro for the high word mask for the sign bit of a double-precision floating-point number.
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.
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