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@stdlib/number-float64-base-to-words
Advanced tools
Split a double-precision floating-point number into a higher order word and a lower order word.
@stdlib/number-float64-base-to-words is a utility package that provides functionality to convert a 64-bit floating-point number to its IEEE 754 binary representation. This can be useful for low-level bitwise operations, debugging, and understanding the internal representation of floating-point numbers.
Convert Float64 to Words
This feature allows you to convert a 64-bit floating-point number to its IEEE 754 binary representation. The function returns an array containing two 32-bit integers representing the higher and lower order words of the floating-point number.
const toWords = require('@stdlib/number-float64-base-to-words');
const words = toWords(3.14);
console.log(words);
The 'ieee754' package provides functions to read and write IEEE 754 floating-point numbers. It is more general-purpose and can handle both 32-bit and 64-bit floating-point numbers. Unlike @stdlib/number-float64-base-to-words, it focuses on encoding and decoding rather than just conversion to words.
Split a double-precision floating-point number into a higher order word and a lower order word.
npm install @stdlib/number-float64-base-to-words
var toWords = require( '@stdlib/number-float64-base-to-words' );
Splits a double-precision floating-point number into a higher order word (unsigned 32-bit integer
) and a lower order word (unsigned 32-bit integer
).
var w = toWords( 3.14e201 );
// returns [ 1774486211, 2479577218 ]
By default, the function returns an array
containing two elements: a higher order word and a lower order word. The lower order word contains the less significant bits, while the higher order word contains the more significant bits and includes the exponent and sign.
var w = toWords( 3.14e201 );
// returns [ 1774486211, 2479577218 ]
var high = w[ 0 ];
// returns 1774486211
var low = w[ 1 ];
// returns 2479577218
To avoid unnecessary memory allocation, the function supports providing an output (destination) object.
var Uint32Array = require( '@stdlib/array-uint32' );
var out = new Uint32Array( 2 );
var w = toWords( out, 3.14e201 );
// returns <Uint32Array>[ 1774486211, 2479577218 ]
var bool = ( w === out );
// returns true
var floor = require( '@stdlib/math-base-special-floor' );
var randu = require( '@stdlib/random-base-randu' );
var pow = require( '@stdlib/math-base-special-pow' );
var toWords = require( '@stdlib/number-float64-base-to-words' );
var frac;
var exp;
var w;
var x;
var i;
// Generate random numbers and split into words...
for ( i = 0; i < 100; i++ ) {
frac = randu() * 10.0;
exp = -floor( randu()*324.0 );
x = frac * pow( 10.0, exp );
w = toWords( x );
console.log( 'x: %d. higher: %d. lower: %d.', x, w[ 0 ], w[ 1 ] );
}
npm install @stdlib/number-float64-base-to-words
#include "stdlib/number/float64/base/to_words.h"
Splits a double-precision floating-point number into a higher order word and a lower order word.
#include <stdint.h>
uint32_t high;
uint32_t low;
stdlib_base_float64_to_words( 3.14, &high, &low );
The function accepts the following arguments:
[in] double
input value.[out] uint32_t*
destination for higher order word.[out] uint32_t*
destination for lower order word.void stdlib_base_float64_to_words( const double x, uint32_t *high, uint32_t *low );
An opaque type definition for a union for converting between a double-precision floating-point number and two unsigned 32-bit integers.
#include <stdint.h>
stdlib_base_float64_words_t w;
// Assign a double-precision floating-point number:
w.value = 3.14;
// Extract the high and low words:
uint32_t high = w.words.high;
uint32_t low = w.words.low;
The union has the following members:
value: double
double-precision floating-point number.
words: struct
struct having the following members:
uint32_t
higher order word.uint32_t
lower order word.#include "stdlib/number/float64/base/to_words.h"
#include <stdint.h>
#include <stdio.h>
int main() {
double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
uint32_t high;
uint32_t low;
int i;
for ( i = 0; i < 4; i++ ) {
stdlib_base_float64_to_words( x[ i ], &high, &low );
printf( "%lf => high: %u, low: %u\n", x[ i ], high, low );
}
}
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.
See LICENSE.
Copyright © 2016-2021. The Stdlib Authors.
0.0.1 (2021-06-15)
No changes reported for this release.
</section> <!-- /.release -->FAQs
Split a double-precision floating-point number into a higher order word and a lower order word.
The npm package @stdlib/number-float64-base-to-words receives a total of 362,523 weekly downloads. As such, @stdlib/number-float64-base-to-words popularity was classified as popular.
We found that @stdlib/number-float64-base-to-words demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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