Mercurial > hg > graal-compiler
comparison graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/UnsignedMath.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 00:36:16 +0200 |
parents | graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/UnsignedMath.java@5e3d1a68664e |
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21555:d12eaef9af72 | 21556:48c1ebd24120 |
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1 /* | |
2 * Copyright (c) 2011, 2011, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 package com.oracle.jvmci.code; | |
24 | |
25 import java.math.*; | |
26 | |
27 //JaCoCo Exclude | |
28 | |
29 /** | |
30 * Utilities for unsigned comparisons. All methods have correct, but slow, standard Java | |
31 * implementations so that they can be used with compilers not supporting the intrinsics. | |
32 */ | |
33 public class UnsignedMath { | |
34 | |
35 private static final long MASK = 0xffffffffL; | |
36 | |
37 /** | |
38 * Unsigned comparison aboveThan for two numbers. | |
39 */ | |
40 public static boolean aboveThan(int a, int b) { | |
41 return (a & MASK) > (b & MASK); | |
42 } | |
43 | |
44 /** | |
45 * Unsigned comparison aboveOrEqual for two numbers. | |
46 */ | |
47 public static boolean aboveOrEqual(int a, int b) { | |
48 return (a & MASK) >= (b & MASK); | |
49 } | |
50 | |
51 /** | |
52 * Unsigned comparison belowThan for two numbers. | |
53 */ | |
54 public static boolean belowThan(int a, int b) { | |
55 return (a & MASK) < (b & MASK); | |
56 } | |
57 | |
58 /** | |
59 * Unsigned comparison belowOrEqual for two numbers. | |
60 */ | |
61 public static boolean belowOrEqual(int a, int b) { | |
62 return (a & MASK) <= (b & MASK); | |
63 } | |
64 | |
65 /** | |
66 * Unsigned comparison aboveThan for two numbers. | |
67 */ | |
68 public static boolean aboveThan(long a, long b) { | |
69 return (a > b) ^ ((a < 0) != (b < 0)); | |
70 } | |
71 | |
72 /** | |
73 * Unsigned comparison aboveOrEqual for two numbers. | |
74 */ | |
75 public static boolean aboveOrEqual(long a, long b) { | |
76 return (a >= b) ^ ((a < 0) != (b < 0)); | |
77 } | |
78 | |
79 /** | |
80 * Unsigned comparison belowThan for two numbers. | |
81 */ | |
82 public static boolean belowThan(long a, long b) { | |
83 return (a < b) ^ ((a < 0) != (b < 0)); | |
84 } | |
85 | |
86 /** | |
87 * Unsigned comparison belowOrEqual for two numbers. | |
88 */ | |
89 public static boolean belowOrEqual(long a, long b) { | |
90 return (a <= b) ^ ((a < 0) != (b < 0)); | |
91 } | |
92 | |
93 /** | |
94 * Unsigned division for two numbers. | |
95 */ | |
96 public static int divide(int a, int b) { | |
97 return (int) ((a & MASK) / (b & MASK)); | |
98 } | |
99 | |
100 /** | |
101 * Unsigned remainder for two numbers. | |
102 */ | |
103 public static int remainder(int a, int b) { | |
104 return (int) ((a & MASK) % (b & MASK)); | |
105 } | |
106 | |
107 /** | |
108 * Unsigned division for two numbers. | |
109 */ | |
110 public static long divide(long a, long b) { | |
111 return bi(a).divide(bi(b)).longValue(); | |
112 } | |
113 | |
114 /** | |
115 * Unsigned remainder for two numbers. | |
116 */ | |
117 public static long remainder(long a, long b) { | |
118 return bi(a).remainder(bi(b)).longValue(); | |
119 } | |
120 | |
121 private static BigInteger bi(long unsigned) { | |
122 return unsigned >= 0 ? BigInteger.valueOf(unsigned) : BigInteger.valueOf(unsigned & 0x7fffffffffffffffL).setBit(63); | |
123 } | |
124 } |