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Copy pathUnsigned.java
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73 lines (66 loc) · 2.56 KB
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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.max.lang;
import com.sun.max.annotate.*;
import com.sun.max.unsafe.*;
/**
* A collection of static methods for doing unsigned arithmetic on Java primitive types
* where the semantics of the arithmetics operations differ from the signed version.
* In addition to providing unsigned arithmetic semantics for the programmer,
* these methods also expose different optimization possibilities to the compiler as
* well as allowing for them to be implemented as compiler builtins.
*
* @author Doug Simon
*/
public class Unsigned {
/**
* Performs unsigned integer division.
*/
@INLINE
@UNSAFE
public static int idiv(int dividend, int divisor) {
return Address.fromUnsignedInt(dividend).dividedBy(divisor).toInt();
}
/**
* Performs unsigned long division.
*/
@INLINE
@UNSAFE
public static long ldiv(long dividend, long divisor) {
return Address.fromLong(dividend).dividedBy(Address.fromLong(divisor)).toLong();
}
/**
* Performs unsigned integer modulus.
*/
@INLINE
@UNSAFE
public static int irem(int dividend, int divisor) {
return Address.fromUnsignedInt(dividend).remainder(divisor);
}
/**
* Performs unsigned long modulus.
*/
@INLINE
@UNSAFE
public static long lrem(long dividend, long divisor) {
return Address.fromLong(dividend).remainder(Address.fromLong(divisor)).toLong();
}
}