text: /**
  * @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 isnan = require( '@stdlib/math/base/assert/is-nan' );
  var isInfinite = require( '@stdlib/math/base/assert/is-infinite' );
  var pow = require( '@stdlib/math/base/special/pow' );
  var floor = require( '@stdlib/math/base/special/floor' );
  var ceil = require( '@stdlib/math/base/special/ceil' );
  var log2 = require( '@stdlib/math/base/special/log2' );
  var MAX_EXP = require( '@stdlib/constants/float64/max-base2-exponent' );
  var MIN_EXP_SUBNORMAL = require( '@stdlib/constants/float64/min-base2-exponent-subnormal' );
  var PINF = require( '@stdlib/constants/float64/pinf' );
  
  
  // VARIABLES //
  
  // 2^1023:
  var HUGE = pow( 2.0, MAX_EXP );
  var HALF_HUGE = HUGE / 2.0;
  
  
  // MAIN //
  
  /**
  * Rounds a numeric value to the nearest power of two on a linear scale.
  *
  * @param {number} x - input value
  * @returns {number} rounded value
  *
  * @example
  * var v = round2( 3.141592653589793 );
  * // returns 4.0
  *
  * @example
  * var v = round2( 13.0 );
  * // returns 16.0
  *
  * @example
  * var v = round2( -0.314 );
  * // returns -0.25
  */
  function round2( x ) {
  	var sign;
  	var half;
  	var p1;
  	var p2;
  	var y1;
  	var y2;
  	var p;
  	if (
  		isnan( x ) ||
  		isInfinite( x ) ||
  		x === 0.0
  	) {
  		return x;
  	}
  	if ( x < 0 ) {
  		x = -x;
  		sign = -1.0;
  	} else {
  		sign = 1.0;
  	}
  	// Solve the equation `2^p = x` for `p`:
  	p = log2( x );
  
  	// If provided the smallest subnormal, no rounding possible:
  	if ( p === MIN_EXP_SUBNORMAL ) {
  		return x;
  	}
  	// Find the previous and next integer powers:
  	p1 = floor( p );
  	p2 = ceil( p );
  
  	// Handle overflow:
  	if ( p1 === MAX_EXP ) {
  		if ( x - HUGE >= HALF_HUGE ) {
  			return sign * PINF; // sign-preserving
  		}
  		return sign * HUGE;
  	}
  	// Compute previous and next powers of two:
  	y1 = pow( 2.0, p1 );
  	y2 = pow( 2.0, p2 );
  
  	// Find the closest power of two:
  	half = ( y2 - y1 ) / 2.0;
  	if ( y1+half > x ) {
  		return sign * y1;
  	}
  	return sign * y2;
  }
  
  
  // EXPORTS //
  
  module.exports = round2;
  