Mercurial > hg > graal-jvmci-8
diff graal/com.oracle.max.criutils/src/com/oracle/max/criutils/UnsignedMath.java @ 5728:956217932b8c
moved classes from com.oracle.max.cri.util to com.oracle.max.crituils
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Thu, 28 Jun 2012 14:15:00 +0200 |
parents | graal/com.oracle.max.cri/src/com/oracle/max/cri/util/UnsignedMath.java@4d7175cf3526 |
children | a3d71693e0ce |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.criutils/src/com/oracle/max/criutils/UnsignedMath.java Thu Jun 28 14:15:00 2012 +0200 @@ -0,0 +1,89 @@ +/* + * Copyright (c) 2011, 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.oracle.max.criutils; + +/** + * Utilities for unsigned comparisons. + * All methods have correct, but slow, standard Java implementations so that + * they can be used with compilers not supporting the intrinsics. + */ +public class UnsignedMath { + private static final long MASK = 0xffffffffL; + + /** + * Unsigned comparison aboveThan for two numbers. + */ + public static boolean aboveThan(int a, int b) { + return (a & MASK) > (b & MASK); + } + + /** + * Unsigned comparison aboveOrEqual for two numbers. + */ + public static boolean aboveOrEqual(int a, int b) { + return (a & MASK) >= (b & MASK); + } + + /** + * Unsigned comparison belowThan for two numbers. + */ + public static boolean belowThan(int a, int b) { + return (a & MASK) < (b & MASK); + } + + /** + * Unsigned comparison belowOrEqual for two numbers. + */ + public static boolean belowOrEqual(int a, int b) { + return (a & MASK) <= (b & MASK); + } + + /** + * Unsigned comparison aboveThan for two numbers. + */ + public static boolean aboveThan(long a, long b) { + return (a > b) ^ ((a < 0) != (b < 0)); + } + + /** + * Unsigned comparison aboveOrEqual for two numbers. + */ + public static boolean aboveOrEqual(long a, long b) { + return (a >= b) ^ ((a < 0) != (b < 0)); + } + + /** + * Unsigned comparison belowThan for two numbers. + */ + public static boolean belowThan(long a, long b) { + return (a < b) ^ ((a < 0) != (b < 0)); + } + + /** + * Unsigned comparison belowOrEqual for two numbers. + */ + public static boolean belowOrEqual(long a, long b) { + return (a <= b) ^ ((a < 0) != (b < 0)); + } +} +