// Licensed to the Apache Software Foundation (ASF) under one

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// distributed with this work for additional information

// regarding copyright ownership. The ASF licenses this file

// to you 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

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package org.apache.impala.util;

public class BitUtil {

// Returns the log2 of 'val'. 'val' must be > 0.

public static int log2Ceiling(long val) {

// Formula is based on the Long.numberOfLeadingZeros() javadoc comment.

return 64 - Long.numberOfLeadingZeros(val - 1);

}

// Round up 'val' to the nearest power of two. 'val' must be > 0.

public static long roundUpToPowerOf2(long val) {

return 1L << log2Ceiling(val);

}

// Round up 'val' to the nearest multiple of a power-of-two 'factor'.

// 'val' must be > 0.

public static long roundUpToPowerOf2Factor(long val, long factor) {

return (val + (factor - 1)) & ~(factor - 1);

}

}