| /* |
| * 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 jdk.vm.ci.code; |
| |
| import java.math.*; |
| |
| //JaCoCo Exclude |
| |
| /** |
| * 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)); |
| } |
| |
| /** |
| * Unsigned division for two numbers. |
| */ |
| public static int divide(int a, int b) { |
| return (int) ((a & MASK) / (b & MASK)); |
| } |
| |
| /** |
| * Unsigned remainder for two numbers. |
| */ |
| public static int remainder(int a, int b) { |
| return (int) ((a & MASK) % (b & MASK)); |
| } |
| |
| /** |
| * Unsigned division for two numbers. |
| */ |
| public static long divide(long a, long b) { |
| return bi(a).divide(bi(b)).longValue(); |
| } |
| |
| /** |
| * Unsigned remainder for two numbers. |
| */ |
| public static long remainder(long a, long b) { |
| return bi(a).remainder(bi(b)).longValue(); |
| } |
| |
| private static BigInteger bi(long unsigned) { |
| return unsigned >= 0 ? BigInteger.valueOf(unsigned) : BigInteger.valueOf(unsigned & 0x7fffffffffffffffL).setBit(63); |
| } |
| } |