main.js (2081B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var getWord = require( './../../../../float32/base/to-word' ); 24 25 26 // VARIABLES // 27 28 // Significand mask: 0 00000000 11111111111111111111111 29 var MASK = 0x007fffff; // TODO: consider making an external constant 30 31 32 // MAIN // 33 34 /** 35 * Returns an integer corresponding to the significand of a single-precision floating-point number. 36 * 37 * @param {number} x - single-precision floating-point number 38 * @returns {uinteger32} significand 39 * 40 * @example 41 * var toFloat32 = require( '@stdlib/number/float64/base/to-float32' ); 42 * var s = significandf( toFloat32( 3.14e34 ) ); // => 10000011000010001110111 43 * // returns 4293751 44 * 45 * @example 46 * var toFloat32 = require( '@stdlib/number/float64/base/to-float32' ); 47 * var s = significandf( toFloat32( 3.14e-34 ) ); // => 10100001011000001010101 48 * // returns 5288021 49 * 50 * @example 51 * var toFloat32 = require( '@stdlib/number/float64/base/to-float32' ); 52 * var s = significandf( toFloat32( -3.14 ) ); // => 10010001111010111000011 53 * // returns 4781507 54 * 55 * @example 56 * var s = significandf( 0.0 ); // => 00000000000000000000000 57 * // returns 0 58 * 59 * @example 60 * var s = significandf( NaN ); // => 10000000000000000000000 61 * // returns 4194304 62 */ 63 function significandf( x ) { 64 // Convert `x` to an unsigned 32-bit integer corresponding to the IEEE 754 binary representation: 65 var w = getWord( x ); 66 67 // Apply a mask to isolate only the significand bits: 68 return w & MASK; 69 } 70 71 72 // EXPORTS // 73 74 module.exports = significandf;