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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 10001x 10001x 10001x 10001x 10001x 10001x 10001x 1x 1x 1x 1x 1x | /**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var getHighWord = require( '@stdlib/number/float64/base/get-high-word' );
// MAIN //
/**
* Returns a boolean indicating if the sign bit is on (true) or off (false).
*
* @param {number} x - input value
* @returns {boolean} boolean indicating if sign bit is on or off
*
* @example
* var bool = signbit( 4.0 );
* // returns false
*
* @example
* var bool = signbit( -9.14e-307 );
* // returns true
*
* @example
* var bool = signbit( 0.0 );
* // returns false
*
* @example
* var bool = signbit( -0.0 );
* // returns true
*/
function signbit( x ) {
// Extract from the input value a higher order word (unsigned 32-bit integer) containing the exponent and sign:
var high = getHighWord( x );
// Shift off all bits which are not the sign bit and check if the sign bit is on:
return ( high >>> 31 ) ? true : false; // eslint-disable-line no-unneeded-ternary
}
// EXPORTS //
module.exports = signbit;
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