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* @license Apache-2.0
*
* Copyright (c) 2026 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 isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var isInfinitef = require( '@stdlib/math/base/assert/is-infinitef' );
var frexpf = require( '@stdlib/math/base/special/frexpf' );
var ldexpf = require( '@stdlib/math/base/special/ldexpf' );
// MAIN //
/**
* Rounds a single-precision floating-point number to the nearest power of two on a linear scale.
*
* @param {number} x - input value
* @returns {number} rounded value
*
* @example
* var v = round2f( 3.0 );
* // returns 4.0
*
* @example
* var v = round2f( 6.0 );
* // returns 8.0
*
* @example
* var v = round2f( -0.3 );
* // returns -0.25
*/
function round2f( x ) {
var sign;
var out;
var e;
var m;
if (
isnanf( x ) ||
isInfinitef( x ) ||
x === 0.0
) {
return x;
}
if ( x < 0.0 ) {
x = -x;
sign = -1.0;
} else {
sign = 1.0;
}
out = frexpf( x );
m = out[ 0 ];
e = out[ 1 ];
if ( m < 0.75 ) {
return sign * ldexpf( 1.0, e-1 );
}
return sign * ldexpf( 1.0, e );
}
module.exports = round2f;
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