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comparison graal/com.oracle.max.asm/src/com/oracle/max/asm/NumUtil.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children 681e969888a7
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3732:3e2e8b8abdaf 3733:e233f5660da4
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.max.asm;
24
25 /**
26 * A collection of static utility functions that check ranges of numbers.
27 */
28 public class NumUtil {
29 public static boolean isShiftCount(int x) {
30 return 0 <= x && x < 32;
31 }
32
33 /**
34 * Determines if a given {@code int} value is the range of unsigned byte
35 * values.
36 */
37 public static boolean isUByte(int x) {
38 return (x & 0xff) == x;
39 }
40
41 /**
42 * Determines if a given {@code int} value is the range of signed byte
43 * values.
44 */
45 public static boolean isByte(int x) {
46 return (byte) x == x;
47 }
48
49 /**
50 * Determines if a given {@code long} value is the range of unsigned byte
51 * values.
52 */
53 public static boolean isUByte(long x) {
54 return (x & 0xffL) == x;
55 }
56
57 /**
58 * Determines if a given {@code long} value is the range of signed byte
59 * values.
60 */
61 public static boolean isByte(long l) {
62 return (byte) l == l;
63 }
64
65 /**
66 * Determines if a given {@code long} value is the range of unsigned int
67 * values.
68 */
69 public static boolean isUInt(long x) {
70 return (x & 0xffffffffL) == x;
71 }
72
73 /**
74 * Determines if a given {@code long} value is the range of signed int
75 * values.
76 */
77 public static boolean isInt(long l) {
78 return (int) l == l;
79 }
80
81 /**
82 * Determines if a given {@code int} value is the range of signed short
83 * values.
84 */
85 public static boolean isShort(int x) {
86 return (short) x == x;
87 }
88
89 public static boolean isUShort(int s) {
90 return s == (s & 0xFFFF);
91 }
92
93 public static boolean is32bit(long x) {
94 return -0x80000000L <= x && x < 0x80000000L;
95 }
96
97 public static short safeToShort(int v) {
98 assert isShort(v);
99 return (short) v;
100 }
101 }